/*
* Copyright © 2008 Intel Corporation
* 2014 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_fixed.h>
#include <drm/drm_probe_helper.h>
#include "i915_drv.h"
#include "i915_reg.h"
#include "intel_atomic.h"
#include "intel_audio.h"
#include "intel_connector.h"
#include "intel_crtc.h"
#include "intel_ddi.h"
#include "intel_de.h"
#include "intel_display_driver.h"
#include "intel_display_types.h"
#include "intel_dp.h"
#include "intel_dp_hdcp.h"
#include "intel_dp_mst.h"
#include "intel_dp_tunnel.h"
#include "intel_dp_link_training.h"
#include "intel_dpio_phy.h"
#include "intel_hdcp.h"
#include "intel_hotplug.h"
#include "intel_link_bw.h"
#include "intel_psr.h"
#include "intel_vdsc.h"
#include "skl_scaler.h"
static int intel_dp_mst_max_dpt_bpp(const struct intel_crtc_state *crtc_state,
bool dsc)
{
struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
if (!intel_dp_is_uhbr(crtc_state) || DISPLAY_VER(i915) >= 20 || !dsc)
return INT_MAX;
/*
* DSC->DPT interface width:
* ICL-MTL: 72 bits (each branch has 72 bits, only left branch is used)
* LNL+: 144 bits (not a bottleneck in any config)
*
* Bspec/49259 suggests that the FEC overhead needs to be
* applied here, though HW people claim that neither this FEC
* or any other overhead is applicable here (that is the actual
* available_bw is just symbol_clock * 72). However based on
* testing on MTL-P the
* - DELL U3224KBA display
* - Unigraf UCD-500 CTS test sink
* devices the
* - 5120x2880/995.59Mhz
* - 6016x3384/1357.23Mhz
* - 6144x3456/1413.39Mhz
* modes (all the ones having a DPT limit on the above devices),
* both the channel coding efficiency and an additional 3%
* overhead needs to be accounted for.
*/
return div64_u64(mul_u32_u32(intel_dp_link_symbol_clock(crtc_state->port_clock) * 72,
drm_dp_bw_channel_coding_efficiency(true)),
mul_u32_u32(adjusted_mode->crtc_clock, 1030000));
}
static int intel_dp_mst_bw_overhead(const struct intel_crtc_state *crtc_state,
const struct intel_connector *connector,
bool ssc, bool dsc, int bpp_x16)
{
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
unsigned long flags = DRM_DP_BW_OVERHEAD_MST;
int dsc_slice_count = 0;
int overhead;
flags |= intel_dp_is_uhbr(crtc_state) ? DRM_DP_BW_OVERHEAD_UHBR : 0;
flags |= ssc ? DRM_DP_BW_OVERHEAD_SSC_REF_CLK : 0;
flags |= crtc_state->fec_enable ? DRM_DP_BW_OVERHEAD_FEC : 0;
if (dsc) {
flags |= DRM_DP_BW_OVERHEAD_DSC;
dsc_slice_count = intel_dp_dsc_get_slice_count(connector,
adjusted_mode->clock,
adjusted_mode->hdisplay,
crtc_state->joiner_pipes);
}
overhead = drm_dp_bw_overhead(crtc_state->lane_count,
adjusted_mode->hdisplay,
dsc_slice_count,
bpp_x16,
flags);
/*
* TODO: clarify whether a minimum required by the fixed FEC overhead
* in the bspec audio programming sequence is required here.
*/
return max(overhead, intel_dp_bw_fec_overhead(crtc_state->fec_enable));
}
static void intel_dp_mst_compute_m_n(const struct intel_crtc_state *crtc_state,
const struct intel_connector *connector,
int overhead,
int bpp_x16,
struct intel_link_m_n *m_n)
{
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
/* TODO: Check WA 14013163432 to set data M/N for full BW utilization. */
intel_link_compute_m_n(bpp_x16, crtc_state->lane_count,
adjusted_mode->crtc_clock,
crtc_state->port_clock,
overhead,
m_n);
m_n->tu = DIV_ROUND_UP_ULL(mul_u32_u32(m_n->data_m, 64), m_n->data_n);
}
static int intel_dp_mst_calc_pbn(int pixel_clock, int bpp_x16, int bw_overhead)
{
int effective_data_rate =
intel_dp_effective_data_rate(pixel_clock, bpp_x16, bw_overhead);
/*
* TODO: Use drm_dp_calc_pbn_mode() instead, once it's converted
* to calculate PBN with the BW overhead passed to it.
*/
return DIV_ROUND_UP(effective_data_rate * 64, 54 * 1000);
}
static int intel_dp_mst_find_vcpi_slots_for_bpp(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state,
int max_bpp,
int min_bpp,
struct link_config_limits *limits,
struct drm_connector_state *conn_state,
int step,
bool dsc)
{
struct drm_atomic_state *state = crtc_state->uapi.state;
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_dp *intel_dp = &intel_mst->primary->dp;
struct drm_dp_mst_topology_state *mst_state;
struct intel_connector *connector =
to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
int bpp, slots = -EINVAL;
int max_dpt_bpp;
int ret = 0;
mst_state = drm_atomic_get_mst_topology_state(state, &intel_dp->mst_mgr);
if (IS_ERR(mst_state))
return PTR_ERR(mst_state);
crtc_state->lane_count = limits->max_lane_count;
crtc_state->port_clock = limits->max_rate;
if (dsc) {
if (!intel_dp_supports_fec(intel_dp, connector, crtc_state))
return -EINVAL;
crtc_state->fec_enable = !intel_dp_is_uhbr(crtc_state);
}
mst_state->pbn_div = drm_dp_get_vc_payload_bw(&intel_dp->mst_mgr,
crtc_state->port_clock,
crtc_state->lane_count);
max_dpt_bpp = intel_dp_mst_max_dpt_bpp(crtc_state, dsc);
if (max_bpp > max_dpt_bpp) {
drm_dbg_kms(&i915->drm, "Limiting bpp to max DPT bpp (%d -> %d)\n",
max_bpp, max_dpt_bpp);
max_bpp = max_dpt_bpp;
}
drm_dbg_kms(&i915->drm, "Looking for slots in range min bpp %d max bpp %d\n",
min_bpp, max_bpp);
for (bpp = max_bpp; bpp >= min_bpp; bpp -= step) {
int local_bw_overhead;
int remote_bw_overhead;
int link_bpp_x16;
int remote_tu;
fixed20_12 pbn;
drm_dbg_kms(&i915->drm, "Trying bpp %d\n", bpp);
link_bpp_x16 = fxp_q4_from_int(dsc ? bpp :
intel_dp_output_bpp(crtc_state->output_format, bpp));
local_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
false, dsc, link_bpp_x16);
remote_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, connector,
true, dsc, link_bpp_x16);
intel_dp_mst_compute_m_n(crtc_state, connector,
local_bw_overhead,
link_bpp_x16,
&crtc_state->dp_m_n);
/*
* The TU size programmed to the HW determines which slots in
* an MTP frame are used for this stream, which needs to match
* the payload size programmed to the first downstream branch
* device's payload table.
*
* Note that atm the payload's PBN value DRM core sends via
* the ALLOCATE_PAYLOAD side-band message matches the payload
* size (which it calculates from the PBN value) it programs
* to the first branch device's payload table. The allocation
* in the payload table could be reduced though (to
* crtc_state->dp_m_n.tu), provided that the driver doesn't
* enable SSC on the corresponding link.
*/
pbn.full = dfixed_const(intel_dp_mst_calc_pbn(adjusted_mode->crtc_clock,
link_bpp_x16,
remote_bw_overhead));
remote_tu = DIV_ROUND_UP(pbn.full, mst_state->pbn_div.full);
/*
* Aligning the TUs ensures that symbols consisting of multiple
* (4) symbol cycles don't get split between two consecutive
* MTPs, as required by Bspec.
* TODO: remove the alignment restriction for 128b/132b links
* on some platforms, where Bspec allows this.
*/
remote_tu = ALIGN(remote_tu, 4 / crtc_state->lane_count);
/*
* Also align PBNs accordingly, since MST core will derive its
* own copy of TU from the PBN in drm_dp_atomic_find_time_slots().
* The above comment about the difference between the PBN
* allocated for the whole path and the TUs allocated for the
* first branch device's link also applies here.
*/
pbn.full = remote_tu * mst_state->pbn_div.full;
crtc_state->pbn = dfixed_trunc(pbn);
drm_WARN_ON(&i915->drm, remote_tu < crtc_state->dp_m_n.tu);
crtc_state->dp_m_n.tu = remote_tu;
slots = drm_dp_atomic_find_time_slots(state, &intel_dp->mst_mgr,
connector->port,
crtc_state->pbn);
if (slots == -EDEADLK)
return slots;
if (slots >= 0) {
drm_WARN_ON(&i915->drm, slots != crtc_state->dp_m_n.tu);
break;
}
}
/* We failed to find a proper bpp/timeslots, return error */
if (ret)
slots = ret;
if (slots < 0) {
drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n",
slots);
} else {
if (!dsc)
crtc_state->pipe_bpp = bpp;
else
crtc_state->dsc.compressed_bpp_x16 = fxp_q4_from_int(bpp);
drm_dbg_kms(&i915->drm, "Got %d slots for pipe bpp %d dsc %d\n", slots, bpp, dsc);
}
return slots;
}
static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
struct link_config_limits *limits)
{
int slots = -EINVAL;
/*
* FIXME: allocate the BW according to link_bpp, which in the case of
* YUV420 is only half of the pipe bpp value.
*/
slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state,
fxp_q4_to_int(limits->link.max_bpp_x16),
fxp_q4_to_int(limits->link.min_bpp_x16),
limits,
conn_state, 2 * 3, false);
if (slots < 0)
return slots;
return 0;
}
static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
struct link_config_limits *limits)
{
struct intel_connector *connector =
to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
int slots = -EINVAL;
int i, num_bpc;
u8 dsc_bpc[3] = {};
int min_bpp, max_bpp, sink_min_bpp, sink_max_bpp;
u8 dsc_max_bpc;
int min_compressed_bpp, max_compressed_bpp;
/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
if (DISPLAY_VER(i915) >= 12)
dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc);
else
dsc_max_bpc = min_t(u8, 10, conn_state->max_requested_bpc);
max_bpp = min_t(u8, dsc_max_bpc * 3, limits->pipe.max_bpp);
min_bpp = limits->pipe.min_bpp;
num_bpc = drm_dp_dsc_sink_supported_input_bpcs(connector->dp.dsc_dpcd,
dsc_bpc);
drm_dbg_kms(&i915->drm, "DSC Source supported min bpp %d max bpp %d\n",
min_bpp, max_bpp);
sink_max_bpp = dsc_bpc[0] * 3;
sink_min_bpp = sink_max_bpp;
for (i = 1; i < num_bpc; i++) {
if (sink_min_bpp > dsc_bpc[i] * 3)
sink_min_bpp = dsc_bpc[i] * 3;
if (sink_max_bpp < dsc_bpc[i] * 3)
sink_max_bpp = dsc_bpc[i] * 3;
}
drm_dbg_kms(&i915->drm, "DSC Sink supported min bpp %d max bpp %d\n",
sink_min_bpp, sink_max_bpp);
if (min_bpp < sink_min_bpp)
min_bpp = sink_min_bpp;
if (max_bpp > sink_max_bpp)
max_bpp = sink_max_bpp;
crtc_state->pipe_bpp = max_bpp;
max_compressed_bpp = intel_dp_dsc_sink_max_compressed_bpp(connector,
crtc_state,
max_bpp / 3);
max_compressed_bpp = min(max_compressed_bpp,
fxp_q4_to_int(limits->link.max_bpp_x16));
min_compressed_bpp = intel_dp_dsc_sink_min_compressed_bpp(crtc_state);
min_compressed_bpp = max(min_compressed_bpp,
fxp_q4_to_int_roundup(limits->link.min_bpp_x16));
drm_dbg_kms(&i915->drm, "DSC Sink supported compressed min bpp %d compressed max bpp %d\n",
min_compressed_bpp, max_compressed_bpp);
/* Align compressed bpps according to our own constraints */
max_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, max_compressed_bpp,
crtc_state->pipe_bpp);
min_compressed_bpp = intel_dp_dsc_nearest_valid_bpp(i915, min_compressed_bpp,
crtc_state->pipe_bpp);
slots = intel_dp_mst_find_vcpi_slots_for_bpp(encoder, crtc_state, max_compressed_bpp,
min_compressed_bpp, limits,
conn_state, 1, true);
if (slots < 0)
return slots;
return 0;
}
static int intel_dp_mst_update_slots(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_dp *intel_dp = &intel_mst->primary->dp;
struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
struct drm_dp_mst_topology_state *topology_state;
u8 link_coding_cap = intel_dp_is_uhbr(crtc_state) ?
DP_CAP_ANSI_128B132B : DP_CAP_ANSI_8B10B;
topology_state = drm_atomic_get_mst_topology_state(conn_state->state, mgr);
if (IS_ERR(topology_state)) {
drm_dbg_kms(&i915->drm, "slot update failed\n");
return PTR_ERR(topology_state);
}
drm_dp_mst_update_slots(topology_state, link_coding_cap);
return 0;
}
static int mode_hblank_period_ns(const struct drm_display_mode *mode)
{
return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(mode->htotal - mode->hdisplay,
NSEC_PER_SEC / 1000),
mode->crtc_clock);
}
static bool
hblank_expansion_quirk_needs_dsc(const struct intel_connector *connector,
const struct intel_crtc_state *crtc_state,
const struct link_config_limits *limits)
{
const struct drm_display_mode *adjusted_mode =
&crtc_state->hw.adjusted_mode;
bool is_uhbr_sink = connector->mst_port &&
drm_dp_128b132b_supported(connector->mst_port->dpcd);
int hblank_limit = is_uhbr_sink ? 500 : 300;
if (!connector->dp.dsc_hblank_expansion_quirk)
return false;
if (is_uhbr_sink && !drm_dp_is_uhbr_rate(limits->max_rate))
return false;
if (mode_hblank_period_ns(adjusted_mode) > hblank_limit)
return false;
return true;
}
static bool
adjust_limits_for_dsc_hblank_expansion_quirk(const struct intel_connector *connector,
const struct intel_crtc_state *crtc_state,
struct link_config_limits *limits,
bool dsc)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
const struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
int min_bpp_x16 = limits->link.min_bpp_x16;
if (!hblank_expansion_quirk_needs_dsc(connector, crtc_state, limits))
return true;
if (!dsc) {
if (intel_dp_supports_dsc(connector, crtc_state)) {
drm_dbg_kms(&i915->drm,
"[CRTC:%d:%s][CONNECTOR:%d:%s] DSC needed by hblank expansion quirk\n",
crtc->base.base.id, crtc->base.name,
connector->base.base.id, connector->base.name);
return false;
}
drm_dbg_kms(&i915->drm,
"[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to 24 due to hblank expansion quirk\n",
crtc->base.base.id, crtc->base.name,
connector->base.base.id, connector->base.name);
if (limits->link.max_bpp_x16 < fxp_q4_from_int(24))
return false;
limits->link.min_bpp_x16 = fxp_q4_from_int(24);
return true;
}
drm_WARN_ON(&i915->drm, limits->min_rate != limits->max_rate);
if (limits->max_rate < 540000)
min_bpp_x16 = fxp_q4_from_int(13);
else if (limits->max_rate < 810000)
min_bpp_x16 = fxp_q4_from_int(10);
if (limits->link.min_bpp_x16 >= min_bpp_x16)
return true;
drm_dbg_kms(&i915->drm,
"[CRTC:%d:%s][CONNECTOR:%d:%s] Increasing link min bpp to " FXP_Q4_FMT " in DSC mode due to hblank expansion quirk\n",
crtc->base.base.id, crtc->base.name,
connector->base.base.id, connector->base.name,
FXP_Q4_ARGS(min_bpp_x16));
if (limits->link.max_bpp_x16 < min_bpp_x16)
return false;
limits->link.min_bpp_x16 = min_bpp_x16;
return true;
}
static bool
intel_dp_mst_compute_config_limits(struct intel_dp *intel_dp,
const struct intel_connector *connector,
struct intel_crtc_state *crtc_state,
bool dsc,
struct link_config_limits *limits)
{
/*
* for MST we always configure max link bw - the spec doesn't
* seem to suggest we should do otherwise.
*/
limits->min_rate = limits->max_rate =
intel_dp_max_link_rate(intel_dp);
limits->min_lane_count = limits->max_lane_count =
intel_dp_max_lane_count(intel_dp);
limits->pipe.min_bpp = intel_dp_min_bpp(crtc_state->output_format);
/*
* FIXME: If all the streams can't fit into the link with
* their current pipe_bpp we should reduce pipe_bpp across
* the board until things start to fit. Until then we
* limit to <= 8bpc since that's what was hardcoded for all
* MST streams previously. This hack should be removed once
* we have the proper retry logic in place.
*/
limits->pipe.max_bpp = min(crtc_state->pipe_bpp, 24);
intel_dp_adjust_compliance_config(intel_dp, crtc_state, limits);
if (!intel_dp_compute_config_link_bpp_limits(intel_dp,
crtc_state,
dsc,
limits))
return false;
return adjust_limits_for_dsc_hblank_expansion_quirk(connector,
crtc_state,
limits,
dsc);
}
static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config,
struct drm_connector_state *conn_state)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_dp *intel_dp = &intel_mst->primary->dp;
struct intel_connector *connector =
to_intel_connector(conn_state->connector);
const struct drm_display_mode *adjusted_mode =
&pipe_config->hw.adjusted_mode;
struct link_config_limits limits;
bool dsc_needed, joiner_needs_dsc;
int ret = 0;
if (pipe_config->fec_enable &&
!intel_dp_supports_fec(intel_dp, connector, pipe_config))
return -EINVAL;
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
return -EINVAL;
if (intel_dp_need_joiner(intel_dp, connector,
adjusted_mode->crtc_hdisplay,
adjusted_mode->crtc_clock))
pipe_config->joiner_pipes = GENMASK(crtc->pipe + 1, crtc->pipe);
pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
pipe_config->has_pch_encoder = false;
joiner_needs_dsc = intel_dp_joiner_needs_dsc(dev_priv, pipe_config->joiner_pipes);
dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en ||
!intel_dp_mst_compute_config_limits(intel_dp,
connector,
pipe_config,
false,
&limits);
if (!dsc_needed) {
ret = intel_dp_mst_compute_link_config(encoder, pipe_config,
conn_state, &limits);
if (ret == -EDEADLK)
return ret;
if (ret)
dsc_needed = true;
}
/* enable compression if the mode doesn't fit available BW */
if (dsc_needed) {
drm_dbg_kms(&dev_priv->drm, "Try DSC (fallback=%s, joiner=%s, force=%s)\n",
str_yes_no(ret), str_yes_no(joiner_needs_dsc),
str_yes_no(intel_dp->force_dsc_en));
if (!intel_dp_supports_dsc(connector, pipe_config))
return -EINVAL;
if (!intel_dp_mst_compute_config_limits(intel_dp,
connector,
pipe_config,
true,
&limits))
return -EINVAL;
/*
* FIXME: As bpc is hardcoded to 8, as mentioned above,
* WARN and ignore the debug flag force_dsc_bpc for now.
*/
drm_WARN(&dev_priv->drm, intel_dp->force_dsc_bpc, "Cannot Force BPC for MST\n");
/*
* Try to get at least some timeslots and then see, if
* we can fit there with DSC.
*/
drm_dbg_kms(&dev_priv->drm, "Trying to find VCPI slots in DSC mode\n");
ret = intel_dp_dsc_mst_compute_link_config(encoder, pipe_config,
conn_state, &limits);
if (ret < 0)
return ret;
ret = intel_dp_dsc_compute_config(intel_dp, pipe_config,
conn_state, &limits,
pipe_config->dp_m_n.tu, false);
}
if (ret)
return ret;
ret = intel_dp_mst_update_slots(encoder, pipe_config, conn_state);
if (ret)
return ret;
pipe_config->limited_color_range =
intel_dp_limited_color_range(pipe_config, conn_state);
if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv))
pipe_config->lane_lat_optim_mask =
bxt_dpio_phy_calc_lane_lat_optim_mask(pipe_config->lane_count);
intel_dp_audio_compute_config(encoder, pipe_config, conn_state);
intel_ddi_compute_min_voltage_level(pipe_config);
intel_psr_compute_config(intel_dp, pipe_config, conn_state);
return intel_dp_tunnel_atomic_compute_stream_bw(state, intel_dp, connector,
pipe_config);
}
/*
* Iterate over all connectors and return a mask of
* all CPU transcoders streaming over the same DP link.
*/
static unsigned int
intel_dp_mst_transcoder_mask(struct intel_atomic_state *state,
struct intel_dp *mst_port)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
const struct intel_digital_connector_state *conn_state;
struct intel_connector *connector;
u8 transcoders = 0;
int i;
if (DISPLAY_VER(dev_priv) < 12)
return 0;
for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
const struct intel_crtc_state *crtc_state;
struct intel_crtc *crtc;
if (connector->mst_port != mst_port || !conn_state->base.crtc)
continue;
crtc = to_intel_crtc(conn_state->base.crtc);
crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
if (!crtc_state->hw.active)
continue;
transcoders |= BIT(crtc_state->cpu_transcoder);
}
return transcoders;
}
static u8 get_pipes_downstream_of_mst_port(struct intel_atomic_state *state,
struct drm_dp_mst_topology_mgr *mst_mgr,
struct drm_dp_mst_port *parent_port)
{
const struct intel_digital_connector_state *conn_state;
struct intel_connector *connector;
u8 mask = 0;
int i;
for_each_new_intel_connector_in_state(state, connector, conn_state, i) {
if (!conn_state->base.crtc)
continue;
if (&connector->mst_port->mst_mgr != mst_mgr)
continue;
if (connector->port != parent_port &&
!drm_dp_mst_port_downstream_of_parent(mst_mgr,
connector->port,
parent_port))
continue;
mask |= BIT(to_intel_crtc(conn_state->base.crtc)->pipe);
}
return mask;
}
static int intel_dp_mst_check_fec_change(struct intel_atomic_state *state,
struct drm_dp_mst_topology_mgr *mst_mgr,
struct intel_link_bw_limits *limits)
{
struct drm_i915_private *i915 = to_i915(state->base.dev);
struct intel_crtc *crtc;
u8 mst_pipe_mask;
u8 fec_pipe_mask = 0;
int ret;
mst_pipe_mask = get_pipes_downstream_of_mst_port(state, mst_mgr, NULL);
for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc, mst_pipe_mask) {
struct intel_crtc_state *crtc_state =
intel_atomic_get_new_crtc_state(state, crtc);
/* Atomic connector check should've added all the MST CRTCs. */
if (drm_WARN_ON(&i915->drm, !crtc_state))
return -EINVAL;
if (crtc_state->fec_enable)
fec_pipe_mask |= BIT(crtc->pipe);
}
if (!fec_pipe_mask || mst_pipe_mask == fec_pipe_mask)
return 0;
limits->force_fec_pipes |= mst_pipe_mask;
ret = intel_modeset_pipes_in_mask_early(state, "MST FEC",
mst_pipe_mask);
return ret ? : -EAGAIN;
}
static int intel_dp_mst_check_bw(struct intel_atomic_state *state,
struct drm_dp_mst_topology_mgr *mst_mgr,
struct drm_dp_mst_topology_state *mst_state,
struct intel_link_bw_limits *limits)
{
struct drm_dp_mst_port *mst_port;
u8 mst_port_pipes;
int ret;
ret = drm_dp_mst_atomic_check_mgr(&state->base, mst_mgr, mst_state, &mst_port);
if (ret != -ENOSPC)
return ret;
mst_port_pipes = get_pipes_downstream_of_mst_port(state, mst_mgr, mst_port);
ret = intel_link_bw_reduce_bpp(state, limits,
mst_port_pipes, "MST link BW");
return ret ? : -EAGAIN;
}
/**
* intel_dp_mst_atomic_check_link - check all modeset MST link configuration
* @state: intel atomic state
* @limits: link BW limits
*
* Check the link configuration for all modeset MST outputs. If the
* configuration is invalid @limits will be updated if possible to
* reduce the total BW, after which the configuration for all CRTCs in
* @state must be recomputed with the updated @limits.
*
* Returns:
* - 0 if the confugration is valid
* - %-EAGAIN, if the configuration is invalid and @limits got updated
* with fallback values with which the configuration of all CRTCs in
* @state must be recomputed
* - Other negative error, if the configuration is invalid without a
* fallback possibility, or the check failed for another reason
*/
int intel_dp_mst_atomic_check_link(struct intel_atomic_state *state,
struct intel_link_bw_limits *limits)
{
struct drm_dp_mst_topology_mgr *mgr;
struct drm_dp_mst_topology_state *mst_state;
int ret;
int i;
for_each_new_mst_mgr_in_state(&state->base, mgr, mst_state, i) {
ret = intel_dp_mst_check_fec_change(state, mgr, limits);
if (ret)
return ret;
ret = intel_dp_mst_check_bw(state, mgr, mst_state,
limits);
if (ret)
return ret;
}
return 0;
}
static int intel_dp_mst_compute_config_late(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state,
struct drm_connector_state *conn_state)
{
struct intel_atomic_state *state = to_intel_atomic_state(conn_state->state);
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_dp *intel_dp = &intel_mst->primary->dp;
/* lowest numbered transcoder will be designated master */
crtc_state->mst_master_transcoder =
ffs(intel_dp_mst_transcoder_mask(state, intel_dp)) - 1;
return 0;
}
/*
* If one of the connectors in a MST stream needs a modeset, mark all CRTCs
* that shares the same MST stream as mode changed,
* intel_modeset_pipe_config()+intel_crtc_check_fastset() will take care to do
* a fastset when possible.
*
* On TGL+ this is required since each stream go through a master transcoder,
* so if the master transcoder needs modeset, all other streams in the
* topology need a modeset. All platforms need to add the atomic state
* for all streams in the topology, since a modeset on one may require
* changing the MST link BW usage of the others, which in turn needs a
* recomputation of the corresponding CRTC states.
*/
static int
intel_dp_mst_atomic_topology_check(struct intel_connector *connector,
struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
struct drm_connector_list_iter connector_list_iter;
struct intel_connector *connector_iter;
int ret = 0;
if (!intel_connector_needs_modeset(state, &connector->base))
return 0;
drm_connector_list_iter_begin(&dev_priv->drm, &connector_list_iter);
for_each_intel_connector_iter(connector_iter, &connector_list_iter) {
struct intel_digital_connector_state *conn_iter_state;
struct intel_crtc_state *crtc_state;
struct intel_crtc *crtc;
if (connector_iter->mst_port != connector->mst_port ||
connector_iter == connector)
continue;
conn_iter_state = intel_atomic_get_digital_connector_state(state,
connector_iter);
if (IS_ERR(conn_iter_state)) {
ret = PTR_ERR(conn_iter_state);
break;
}
if (!conn_iter_state->base.crtc)
continue;
crtc = to_intel_crtc(conn_iter_state->base.crtc);
crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
if (IS_ERR(crtc_state)) {
ret = PTR_ERR(crtc_state);
break;
}
ret = drm_atomic_add_affected_planes(&state->base, &crtc->base);
if (ret)
break;
crtc_state->uapi.mode_changed = true;
}
drm_connector_list_iter_end(&connector_list_iter);
return ret;
}
static int
intel_dp_mst_atomic_check(struct drm_connector *connector,
struct drm_atomic_state *_state)
{
struct intel_atomic_state *state = to_intel_atomic_state(_state);
struct intel_connector *intel_connector =
to_intel_connector(connector);
int ret;
ret = intel_digital_connector_atomic_check(connector, &state->base);
if (ret)
return ret;
ret = intel_dp_mst_atomic_topology_check(intel_connector, state);
if (ret)
return ret;
if (intel_connector_needs_modeset(state, connector)) {
ret = intel_dp_tunnel_atomic_check_state(state,
intel_connector->mst_port,
intel_connector);
if (ret)
return ret;
}
return drm_dp_atomic_release_time_slots(&state->base,
&intel_connector->mst_port->mst_mgr,
intel_connector->port);
}
static void clear_act_sent(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
intel_de_write(i915, dp_tp_status_reg(encoder, crtc_state),
DP_TP_STATUS_ACT_SENT);
}
static void wait_for_act_sent(struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = to_i915(encoder->base.dev);
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_dp *intel_dp = &intel_mst->primary->dp;
if (intel_de_wait_for_set(i915, dp_tp_status_reg(encoder, crtc_state),
DP_TP_STATUS_ACT_SENT, 1))
drm_err(&i915->drm, "Timed out waiting for ACT sent\n");
drm_dp_check_act_status(&intel_dp->mst_mgr);
}
static void intel_mst_disable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *old_crtc_state,
const struct drm_connector_state *old_conn_state)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
struct intel_dp *intel_dp = &dig_port->dp;
struct intel_connector *connector =
to_intel_connector(old_conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
drm_dbg_kms(&i915->drm, "active links %d\n",
intel_dp->active_mst_links);
if (intel_dp->active_mst_links == 1)
intel_dp->link_trained = false;
intel_hdcp_disable(intel_mst->connector);
intel_dp_sink_disable_decompression(state, connector, old_crtc_state);
}
static void intel_mst_post_disable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *old_crtc_state,
const struct drm_connector_state *old_conn_state)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
struct intel_dp *intel_dp = &dig_port->dp;
struct intel_connector *connector =
to_intel_connector(old_conn_state->connector);
struct drm_dp_mst_topology_state *old_mst_state =
drm_atomic_get_old_mst_topology_state(&state->base, &intel_dp->mst_mgr);
struct drm_dp_mst_topology_state *new_mst_state =
drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
const struct drm_dp_mst_atomic_payload *old_payload =
drm_atomic_get_mst_payload_state(old_mst_state, connector->port);
struct drm_dp_mst_atomic_payload *new_payload =
drm_atomic_get_mst_payload_state(new_mst_state, connector->port);
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_crtc *pipe_crtc;
bool last_mst_stream;
intel_dp->active_mst_links--;
last_mst_stream = intel_dp->active_mst_links == 0;
drm_WARN_ON(&dev_priv->drm,
DISPLAY_VER(dev_priv) >= 12 && last_mst_stream &&
!intel_dp_mst_is_master_trans(old_crtc_state));
for_each_intel_crtc_in_pipe_mask(&dev_priv->drm, pipe_crtc,
intel_crtc_joined_pipe_mask(old_crtc_state)) {
const struct intel_crtc_state *old_pipe_crtc_state =
intel_atomic_get_old_crtc_state(state, pipe_crtc);
intel_crtc_vblank_off(old_pipe_crtc_state);
}
intel_disable_transcoder(old_crtc_state);
drm_dp_remove_payload_part1(&intel_dp->mst_mgr, new_mst_state, new_payload);
clear_act_sent(encoder, old_crtc_state);
intel_de_rmw(dev_priv,
TRANS_DDI_FUNC_CTL(dev_priv, old_crtc_state->cpu_transcoder),
TRANS_DDI_DP_VC_PAYLOAD_ALLOC, 0);
wait_for_act_sent(encoder, old_crtc_state);
drm_dp_remove_payload_part2(&intel_dp->mst_mgr, new_mst_state,
old_payload, new_payload);
intel_ddi_disable_transcoder_func(old_crtc_state);
for_each_intel_crtc_in_pipe_mask(&dev_priv->drm, pipe_crtc,
intel_crtc_joined_pipe_mask(old_crtc_state)) {
const struct intel_crtc_state *old_pipe_crtc_state =
intel_atomic_get_old_crtc_state(state, pipe_crtc);
intel_dsc_disable(old_pipe_crtc_state);
if (DISPLAY_VER(dev_priv) >= 9)
skl_scaler_disable(old_pipe_crtc_state);
else
ilk_pfit_disable(old_pipe_crtc_state);
}
/*
* Power down mst path before disabling the port, otherwise we end
* up getting interrupts from the sink upon detecting link loss.
*/
drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
false);
/*
* BSpec 4287: disable DIP after the transcoder is disabled and before
* the transcoder clock select is set to none.
*/
intel_dp_set_infoframes(&dig_port->base, false,
old_crtc_state, NULL);
/*
* From TGL spec: "If multi-stream slave transcoder: Configure
* Transcoder Clock Select to direct no clock to the transcoder"
*
* From older GENs spec: "Configure Transcoder Clock Select to direct
* no clock to the transcoder"
*/
if (DISPLAY_VER(dev_priv) < 12 || !last_mst_stream)
intel_ddi_disable_transcoder_clock(old_crtc_state);
intel_mst->connector = NULL;
if (last_mst_stream)
dig_port->base.post_disable(state, &dig_port->base,
old_crtc_state, NULL);
drm_dbg_kms(&dev_priv->drm, "active links %d\n",
intel_dp->active_mst_links);
}
static void intel_mst_post_pll_disable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *old_crtc_state,
const struct drm_connector_state *old_conn_state)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
struct intel_dp *intel_dp = &dig_port->dp;
if (intel_dp->active_mst_links == 0 &&
dig_port->base.post_pll_disable)
dig_port->base.post_pll_disable(state, encoder, old_crtc_state, old_conn_state);
}
static void intel_mst_pre_pll_enable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *pipe_config,
const struct drm_connector_state *conn_state)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
struct intel_dp *intel_dp = &dig_port->dp;
if (intel_dp->active_mst_links == 0)
dig_port->base.pre_pll_enable(state, &dig_port->base,
pipe_config, NULL);
else
/*
* The port PLL state needs to get updated for secondary
* streams as for the primary stream.
*/
intel_ddi_update_active_dpll(state, &dig_port->base,
to_intel_crtc(pipe_config->uapi.crtc));
}
static bool intel_mst_probed_link_params_valid(struct intel_dp *intel_dp,
int link_rate, int lane_count)
{
return intel_dp->link.mst_probed_rate == link_rate &&
intel_dp->link.mst_probed_lane_count == lane_count;
}
static void intel_mst_set_probed_link_params(struct intel_dp *intel_dp,
int link_rate, int lane_count)
{
intel_dp->link.mst_probed_rate = link_rate;
intel_dp->link.mst_probed_lane_count = lane_count;
}
static void intel_mst_reprobe_topology(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state)
{
if (intel_mst_probed_link_params_valid(intel_dp,
crtc_state->port_clock, crtc_state->lane_count))
return;
drm_dp_mst_topology_queue_probe(&intel_dp->mst_mgr);
intel_mst_set_probed_link_params(intel_dp,
crtc_state->port_clock, crtc_state->lane_count);
}
static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *pipe_config,
const struct drm_connector_state *conn_state)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
struct intel_dp *intel_dp = &dig_port->dp;
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct intel_connector *connector =
to_intel_connector(conn_state->connector);
struct drm_dp_mst_topology_state *mst_state =
drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
int ret;
bool first_mst_stream;
/* MST encoders are bound to a crtc, not to a connector,
* force the mapping here for get_hw_state.
*/
connector->encoder = encoder;
intel_mst->connector = connector;
first_mst_stream = intel_dp->active_mst_links == 0;
drm_WARN_ON(&dev_priv->drm,
DISPLAY_VER(dev_priv) >= 12 && first_mst_stream &&
!intel_dp_mst_is_master_trans(pipe_config));
drm_dbg_kms(&dev_priv->drm, "active links %d\n",
intel_dp->active_mst_links);
if (first_mst_stream)
intel_dp_set_power(intel_dp, DP_SET_POWER_D0);
drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port, true);
intel_dp_sink_enable_decompression(state, connector, pipe_config);
if (first_mst_stream) {
dig_port->base.pre_enable(state, &dig_port->base,
pipe_config, NULL);
intel_mst_reprobe_topology(intel_dp, pipe_config);
}
intel_dp->active_mst_links++;
ret = drm_dp_add_payload_part1(&intel_dp->mst_mgr, mst_state,
drm_atomic_get_mst_payload_state(mst_state, connector->port));
if (ret < 0)
intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
/*
* Before Gen 12 this is not done as part of
* dig_port->base.pre_enable() and should be done here. For
* Gen 12+ the step in which this should be done is different for the
* first MST stream, so it's done on the DDI for the first stream and
* here for the following ones.
*/
if (DISPLAY_VER(dev_priv) < 12 || !first_mst_stream)
intel_ddi_enable_transcoder_clock(encoder, pipe_config);
intel_dsc_dp_pps_write(&dig_port->base, pipe_config);
intel_ddi_set_dp_msa(pipe_config, conn_state);
}
static void enable_bs_jitter_was(const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
u32 clear = 0;
u32 set = 0;
if (!IS_ALDERLAKE_P(i915))
return;
if (!IS_DISPLAY_STEP(i915, STEP_D0, STEP_FOREVER))
return;
/* Wa_14013163432:adlp */
if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
set |= DP_MST_FEC_BS_JITTER_WA(crtc_state->cpu_transcoder);
/* Wa_14014143976:adlp */
if (IS_DISPLAY_STEP(i915, STEP_E0, STEP_FOREVER)) {
if (intel_dp_is_uhbr(crtc_state))
set |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
else if (crtc_state->fec_enable)
clear |= DP_MST_SHORT_HBLANK_WA(crtc_state->cpu_transcoder);
if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
set |= DP_MST_DPT_DPTP_ALIGN_WA(crtc_state->cpu_transcoder);
}
if (!clear && !set)
return;
intel_de_rmw(i915, CHICKEN_MISC_3, clear, set);
}
static void intel_mst_enable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *pipe_config,
const struct drm_connector_state *conn_state)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
struct intel_dp *intel_dp = &dig_port->dp;
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
struct drm_dp_mst_topology_state *mst_state =
drm_atomic_get_new_mst_topology_state(&state->base, &intel_dp->mst_mgr);
enum transcoder trans = pipe_config->cpu_transcoder;
bool first_mst_stream = intel_dp->active_mst_links == 1;
struct intel_crtc *pipe_crtc;
int ret;
drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
if (intel_dp_is_uhbr(pipe_config)) {
const struct drm_display_mode *adjusted_mode =
&pipe_config->hw.adjusted_mode;
u64 crtc_clock_hz = KHz(adjusted_mode->crtc_clock);
intel_de_write(dev_priv, TRANS_DP2_VFREQHIGH(pipe_config->cpu_transcoder),
TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz >> 24));
intel_de_write(dev_priv, TRANS_DP2_VFREQLOW(pipe_config->cpu_transcoder),
TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
}
enable_bs_jitter_was(pipe_config);
intel_ddi_enable_transcoder_func(encoder, pipe_config);
clear_act_sent(encoder, pipe_config);
intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(dev_priv, trans), 0,
TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
drm_dbg_kms(&dev_priv->drm, "active links %d\n",
intel_dp->active_mst_links);
wait_for_act_sent(encoder, pipe_config);
if (first_mst_stream)
intel_ddi_wait_for_fec_status(encoder, pipe_config, true);
ret = drm_dp_add_payload_part2(&intel_dp->mst_mgr,
drm_atomic_get_mst_payload_state(mst_state,
connector->port));
if (ret < 0)
intel_dp_queue_modeset_retry_for_link(state, &dig_port->base, pipe_config);
if (DISPLAY_VER(dev_priv) >= 12)
intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, trans),
FECSTALL_DIS_DPTSTREAM_DPTTG,
pipe_config->fec_enable ? FECSTALL_DIS_DPTSTREAM_DPTTG : 0);
intel_audio_sdp_split_update(pipe_config);
intel_enable_transcoder(pipe_config);
for_each_intel_crtc_in_pipe_mask_reverse(&dev_priv->drm, pipe_crtc,
intel_crtc_joined_pipe_mask(pipe_config)) {
const struct intel_crtc_state *pipe_crtc_state =
intel_atomic_get_new_crtc_state(state, pipe_crtc);
intel_crtc_vblank_on(pipe_crtc_state);
}
intel_hdcp_enable(state, encoder, pipe_config, conn_state);
}
static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
enum pipe *pipe)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
*pipe = intel_mst->pipe;
if (intel_mst->connector)
return true;
return false;
}
static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
dig_port->base.get_config(&dig_port->base, pipe_config);
}
static bool intel_dp_mst_initial_fastset_check(struct intel_encoder *encoder,
struct intel_crtc_state *crtc_state)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
struct intel_digital_port *dig_port = intel_mst->primary;
return intel_dp_initial_fastset_check(&dig_port->base, crtc_state);
}
static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_i915_private *i915 = to_i915(intel_connector->base.dev);
struct intel_dp *intel_dp = intel_connector->mst_port;
const struct drm_edid *drm_edid;
int ret;
if (drm_connector_is_unregistered(connector))
return intel_connector_update_modes(connector, NULL);
if (!intel_display_driver_check_access(i915))
return drm_edid_connector_add_modes(connector);
drm_edid = drm_dp_mst_edid_read(connector, &intel_dp->mst_mgr, intel_connector->port);
ret = intel_connector_update_modes(connector, drm_edid);
drm_edid_free(drm_edid);
return ret;
}
static int
intel_dp_mst_connector_late_register(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
int ret;
ret = drm_dp_mst_connector_late_register(connector,
intel_connector->port);
if (ret < 0)
return ret;
ret = intel_connector_register(connector);
if (ret < 0)
drm_dp_mst_connector_early_unregister(connector,
intel_connector->port);
return ret;
}
static void
intel_dp_mst_connector_early_unregister(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
intel_connector_unregister(connector);
drm_dp_mst_connector_early_unregister(connector,
intel_connector->port);
}
static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.atomic_get_property = intel_digital_connector_atomic_get_property,
.atomic_set_property = intel_digital_connector_atomic_set_property,
.late_register = intel_dp_mst_connector_late_register,
.early_unregister = intel_dp_mst_connector_early_unregister,
.destroy = intel_connector_destroy,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.atomic_duplicate_state = intel_digital_connector_duplicate_state,
};
static int intel_dp_mst_get_modes(struct drm_connector *connector)
{
return intel_dp_mst_get_ddc_modes(connector);
}
static int
intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
struct drm_display_mode *mode,
struct drm_modeset_acquire_ctx *ctx,
enum drm_mode_status *status)
{
struct drm_i915_private *dev_priv = to_i915(connector->dev);
struct intel_connector *intel_connector = to_intel_connector(connector);
struct intel_dp *intel_dp = intel_connector->mst_port;
struct drm_dp_mst_topology_mgr *mgr = &intel_dp->mst_mgr;
struct drm_dp_mst_port *port = intel_connector->port;
const int min_bpp = 18;
int max_dotclk = to_i915(connector->dev)->display.cdclk.max_dotclk_freq;
int max_rate, mode_rate, max_lanes, max_link_clock;
int ret;
bool dsc = false, joiner = false;
u16 dsc_max_compressed_bpp = 0;
u8 dsc_slice_count = 0;
int target_clock = mode->clock;
if (drm_connector_is_unregistered(connector)) {
*status = MODE_ERROR;
return 0;
}
*status = intel_cpu_transcoder_mode_valid(dev_priv, mode);
if (*status != MODE_OK)
return 0;
if (mode->flags & DRM_MODE_FLAG_DBLCLK) {
*status = MODE_H_ILLEGAL;
return 0;
}
if (mode->clock < 10000) {
*status = MODE_CLOCK_LOW;
return 0;
}
max_link_clock = intel_dp_max_link_rate(intel_dp);
max_lanes = intel_dp_max_lane_count(intel_dp);
max_rate = intel_dp_max_link_data_rate(intel_dp,
max_link_clock, max_lanes);
mode_rate = intel_dp_link_required(mode->clock, min_bpp);
/*
* TODO:
* - Also check if compression would allow for the mode
* - Calculate the overhead using drm_dp_bw_overhead() /
* drm_dp_bw_channel_coding_efficiency(), similarly to the
* compute config code, as drm_dp_calc_pbn_mode() doesn't
* account with all the overheads.
* - Check here and during compute config the BW reported by
* DFP_Link_Available_Payload_Bandwidth_Number (or the
* corresponding link capabilities of the sink) in case the
* stream is uncompressed for it by the last branch device.
*/
if (intel_dp_need_joiner(intel_dp, intel_connector,
mode->hdisplay, target_clock)) {
joiner = true;
max_dotclk *= 2;
}
ret = drm_modeset_lock(&mgr->base.lock, ctx);
if (ret)
return ret;
if (mode_rate > max_rate || mode->clock > max_dotclk ||
drm_dp_calc_pbn_mode(mode->clock, min_bpp << 4) > port->full_pbn) {
*status = MODE_CLOCK_HIGH;
return 0;
}
if (intel_dp_has_dsc(intel_connector)) {
/*
* TBD pass the connector BPC,
* for now U8_MAX so that max BPC on that platform would be picked
*/
int pipe_bpp = intel_dp_dsc_compute_max_bpp(intel_connector, U8_MAX);
if (drm_dp_sink_supports_fec(intel_connector->dp.fec_capability)) {
dsc_max_compressed_bpp =
intel_dp_dsc_get_max_compressed_bpp(dev_priv,
max_link_clock,
max_lanes,
target_clock,
mode->hdisplay,
joiner,
INTEL_OUTPUT_FORMAT_RGB,
pipe_bpp, 64);
dsc_slice_count =
intel_dp_dsc_get_slice_count(intel_connector,
target_clock,
mode->hdisplay,
joiner);
}
dsc = dsc_max_compressed_bpp && dsc_slice_count;
}
if (intel_dp_joiner_needs_dsc(dev_priv, joiner) && !dsc) {
*status = MODE_CLOCK_HIGH;
return 0;
}
if (mode_rate > max_rate && !dsc) {
*status = MODE_CLOCK_HIGH;
return 0;
}
*status = intel_mode_valid_max_plane_size(dev_priv, mode, joiner);
return 0;
}
static struct drm_encoder *intel_mst_atomic_best_encoder(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
connector);
struct intel_connector *intel_connector = to_intel_connector(connector);
struct intel_dp *intel_dp = intel_connector->mst_port;
struct intel_crtc *crtc = to_intel_crtc(connector_state->crtc);
return &intel_dp->mst_encoders[crtc->pipe]->base.base;
}
static int
intel_dp_mst_detect(struct drm_connector *connector,
struct drm_modeset_acquire_ctx *ctx, bool force)
{
struct drm_i915_private *i915 = to_i915(connector->dev);
struct intel_connector *intel_connector = to_intel_connector(connector);
struct intel_dp *intel_dp = intel_connector->mst_port;
if (!intel_display_device_enabled(i915))
return connector_status_disconnected;
if (drm_connector_is_unregistered(connector))
return connector_status_disconnected;
if (!intel_display_driver_check_access(i915))
return connector->status;
return drm_dp_mst_detect_port(connector, ctx, &intel_dp->mst_mgr,
intel_connector->port);
}
static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
.get_modes = intel_dp_mst_get_modes,
.mode_valid_ctx = intel_dp_mst_mode_valid_ctx,
.atomic_best_encoder = intel_mst_atomic_best_encoder,
.atomic_check = intel_dp_mst_atomic_check,
.detect_ctx = intel_dp_mst_detect,
};
static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
{
struct intel_dp_mst_encoder *intel_mst = enc_to_mst(to_intel_encoder(encoder));
drm_encoder_cleanup(encoder);
kfree(intel_mst);
}
static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
.destroy = intel_dp_mst_encoder_destroy,
};
static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
{
if (intel_attached_encoder(connector) && connector->base.state->crtc) {
enum pipe pipe;
if (!intel_attached_encoder(connector)->get_hw_state(intel_attached_encoder(connector), &pipe))
return false;
return true;
}
return false;
}
static int intel_dp_mst_add_properties(struct intel_dp *intel_dp,
struct drm_connector *connector,
const char *pathprop)
{
struct drm_i915_private *i915 = to_i915(connector->dev);
drm_object_attach_property(&connector->base,
i915->drm.mode_config.path_property, 0);
drm_object_attach_property(&connector->base,
i915->drm.mode_config.tile_property, 0);
intel_attach_force_audio_property(connector);
intel_attach_broadcast_rgb_property(connector);
/*
* Reuse the prop from the SST connector because we're
* not allowed to create new props after device registration.
*/
connector->max_bpc_property =
intel_dp->attached_connector->base.max_bpc_property;
if (connector->max_bpc_property)
drm_connector_attach_max_bpc_property(connector, 6, 12);
return drm_connector_set_path_property(connector, pathprop);
}
static void
intel_dp_mst_read_decompression_port_dsc_caps(struct intel_dp *intel_dp,
struct intel_connector *connector)
{
u8 dpcd_caps[DP_RECEIVER_CAP_SIZE];
if (!connector->dp.dsc_decompression_aux)
return;
if (drm_dp_read_dpcd_caps(connector->dp.dsc_decompression_aux, dpcd_caps) < 0)
return;
intel_dp_get_dsc_sink_cap(dpcd_caps[DP_DPCD_REV], connector);
}
static bool detect_dsc_hblank_expansion_quirk(const struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct drm_dp_aux *aux = connector->dp.dsc_decompression_aux;
struct drm_dp_desc desc;
u8 dpcd[DP_RECEIVER_CAP_SIZE];
if (!aux)
return false;
/*
* A logical port's OUI (at least for affected sinks) is all 0, so
* instead of that the parent port's OUI is used for identification.
*/
if (drm_dp_mst_port_is_logical(connector->port)) {
aux = drm_dp_mst_aux_for_parent(connector->port);
if (!aux)
aux = &connector->mst_port->aux;
}
if (drm_dp_read_dpcd_caps(aux, dpcd) < 0)
return false;
if (drm_dp_read_desc(aux, &desc, drm_dp_is_branch(dpcd)) < 0)
return false;
if (!drm_dp_has_quirk(&desc,
DP_DPCD_QUIRK_HBLANK_EXPANSION_REQUIRES_DSC))
return false;
/*
* UHBR (MST sink) devices requiring this quirk don't advertise the
* HBLANK expansion support. Presuming that they perform HBLANK
* expansion internally, or are affected by this issue on modes with a
* short HBLANK for other reasons.
*/
if (!drm_dp_128b132b_supported(dpcd) &&
!(dpcd[DP_RECEIVE_PORT_0_CAP_0] & DP_HBLANK_EXPANSION_CAPABLE))
return false;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] DSC HBLANK expansion quirk detected\n",
connector->base.base.id, connector->base.name);
return true;
}
static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port,
const char *pathprop)
{
struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_connector *intel_connector;
struct drm_connector *connector;
enum pipe pipe;
int ret;
intel_connector = intel_connector_alloc();
if (!intel_connector)
return NULL;
intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
intel_connector->sync_state = intel_dp_connector_sync_state;
intel_connector->mst_port = intel_dp;
intel_connector->port = port;
drm_dp_mst_get_port_malloc(port);
intel_dp_init_modeset_retry_work(intel_connector);
intel_connector->dp.dsc_decompression_aux = drm_dp_mst_dsc_aux_for_port(port);
intel_dp_mst_read_decompression_port_dsc_caps(intel_dp, intel_connector);
intel_connector->dp.dsc_hblank_expansion_quirk =
detect_dsc_hblank_expansion_quirk(intel_connector);
connector = &intel_connector->base;
ret = drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs,
DRM_MODE_CONNECTOR_DisplayPort);
if (ret) {
drm_dp_mst_put_port_malloc(port);
intel_connector_free(intel_connector);
return NULL;
}
drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
for_each_pipe(dev_priv, pipe) {
struct drm_encoder *enc =
&intel_dp->mst_encoders[pipe]->base.base;
ret = drm_connector_attach_encoder(&intel_connector->base, enc);
if (ret)
goto err;
}
ret = intel_dp_mst_add_properties(intel_dp, connector, pathprop);
if (ret)
goto err;
ret = intel_dp_hdcp_init(dig_port, intel_connector);
if (ret)
drm_dbg_kms(&dev_priv->drm, "[%s:%d] HDCP MST init failed, skipping.\n",
connector->name, connector->base.id);
return connector;
err:
drm_connector_cleanup(connector);
return NULL;
}
static void
intel_dp_mst_poll_hpd_irq(struct drm_dp_mst_topology_mgr *mgr)
{
struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
intel_hpd_trigger_irq(dp_to_dig_port(intel_dp));
}
static const struct drm_dp_mst_topology_cbs mst_cbs = {
.add_connector = intel_dp_add_mst_connector,
.poll_hpd_irq = intel_dp_mst_poll_hpd_irq,
};
static struct intel_dp_mst_encoder *
intel_dp_create_fake_mst_encoder(struct intel_digital_port *dig_port, enum pipe pipe)
{
struct intel_dp_mst_encoder *intel_mst;
struct intel_encoder *intel_encoder;
struct drm_device *dev = dig_port->base.base.dev;
intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
if (!intel_mst)
return NULL;
intel_mst->pipe = pipe;
intel_encoder = &intel_mst->base;
intel_mst->primary = dig_port;
drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
DRM_MODE_ENCODER_DPMST, "DP-MST %c", pipe_name(pipe));
intel_encoder->type = INTEL_OUTPUT_DP_MST;
intel_encoder->power_domain = dig_port->base.power_domain;
intel_encoder->port = dig_port->base.port;
intel_encoder->cloneable = 0;
/*
* This is wrong, but broken userspace uses the intersection
* of possible_crtcs of all the encoders of a given connector
* to figure out which crtcs can drive said connector. What
* should be used instead is the union of possible_crtcs.
* To keep such userspace functioning we must misconfigure
* this to make sure the intersection is not empty :(
*/
intel_encoder->pipe_mask = ~0;
intel_encoder->compute_config = intel_dp_mst_compute_config;
intel_encoder->compute_config_late = intel_dp_mst_compute_config_late;
intel_encoder->disable = intel_mst_disable_dp;
intel_encoder->post_disable = intel_mst_post_disable_dp;
intel_encoder->post_pll_disable = intel_mst_post_pll_disable_dp;
intel_encoder->update_pipe = intel_ddi_update_pipe;
intel_encoder->pre_pll_enable = intel_mst_pre_pll_enable_dp;
intel_encoder->pre_enable = intel_mst_pre_enable_dp;
intel_encoder->enable = intel_mst_enable_dp;
intel_encoder->audio_enable = intel_audio_codec_enable;
intel_encoder->audio_disable = intel_audio_codec_disable;
intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
intel_encoder->get_config = intel_dp_mst_enc_get_config;
intel_encoder->initial_fastset_check = intel_dp_mst_initial_fastset_check;
return intel_mst;
}
static bool
intel_dp_create_fake_mst_encoders(struct intel_digital_port *dig_port)
{
struct intel_dp *intel_dp = &dig_port->dp;
struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
enum pipe pipe;
for_each_pipe(dev_priv, pipe)
intel_dp->mst_encoders[pipe] = intel_dp_create_fake_mst_encoder(dig_port, pipe);
return true;
}
int
intel_dp_mst_encoder_active_links(struct intel_digital_port *dig_port)
{
return dig_port->dp.active_mst_links;
}
int
intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id)
{
struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
struct intel_dp *intel_dp = &dig_port->dp;
enum port port = dig_port->base.port;
int ret;
if (!HAS_DP_MST(i915) || intel_dp_is_edp(intel_dp))
return 0;
if (DISPLAY_VER(i915) < 12 && port == PORT_A)
return 0;
if (DISPLAY_VER(i915) < 11 && port == PORT_E)
return 0;
intel_dp->mst_mgr.cbs = &mst_cbs;
/* create encoders */
intel_dp_create_fake_mst_encoders(dig_port);
ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm,
&intel_dp->aux, 16, 3, conn_base_id);
if (ret) {
intel_dp->mst_mgr.cbs = NULL;
return ret;
}
return 0;
}
bool intel_dp_mst_source_support(struct intel_dp *intel_dp)
{
return intel_dp->mst_mgr.cbs;
}
void
intel_dp_mst_encoder_cleanup(struct intel_digital_port *dig_port)
{
struct intel_dp *intel_dp = &dig_port->dp;
if (!intel_dp_mst_source_support(intel_dp))
return;
drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
/* encoders will get killed by normal cleanup */
intel_dp->mst_mgr.cbs = NULL;
}
bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state)
{
return crtc_state->mst_master_transcoder == crtc_state->cpu_transcoder;
}
bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state)
{
return crtc_state->mst_master_transcoder != INVALID_TRANSCODER &&
crtc_state->mst_master_transcoder != crtc_state->cpu_transcoder;
}
/**
* intel_dp_mst_add_topology_state_for_connector - add MST topology state for a connector
* @state: atomic state
* @connector: connector to add the state for
* @crtc: the CRTC @connector is attached to
*
* Add the MST topology state for @connector to @state.
*
* Returns 0 on success, negative error code on failure.
*/
static int
intel_dp_mst_add_topology_state_for_connector(struct intel_atomic_state *state,
struct intel_connector *connector,
struct intel_crtc *crtc)
{
struct drm_dp_mst_topology_state *mst_state;
if (!connector->mst_port)
return 0;
mst_state = drm_atomic_get_mst_topology_state(&state->base,
&connector->mst_port->mst_mgr);
if (IS_ERR(mst_state))
return PTR_ERR(mst_state);
mst_state->pending_crtc_mask |= drm_crtc_mask(&crtc->base);
return 0;
}
/**
* intel_dp_mst_add_topology_state_for_crtc - add MST topology state for a CRTC
* @state: atomic state
* @crtc: CRTC to add the state for
*
* Add the MST topology state for @crtc to @state.
*
* Returns 0 on success, negative error code on failure.
*/
int intel_dp_mst_add_topology_state_for_crtc(struct intel_atomic_state *state,
struct intel_crtc *crtc)
{
struct drm_connector *_connector;
struct drm_connector_state *conn_state;
int i;
for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
struct intel_connector *connector = to_intel_connector(_connector);
int ret;
if (conn_state->crtc != &crtc->base)
continue;
ret = intel_dp_mst_add_topology_state_for_connector(state, connector, crtc);
if (ret)
return ret;
}
return 0;
}
static struct intel_connector *
get_connector_in_state_for_crtc(struct intel_atomic_state *state,
const struct intel_crtc *crtc)
{
struct drm_connector_state *old_conn_state;
struct drm_connector_state *new_conn_state;
struct drm_connector *_connector;
int i;
for_each_oldnew_connector_in_state(&state->base, _connector,
old_conn_state, new_conn_state, i) {
struct intel_connector *connector =
to_intel_connector(_connector);
if (old_conn_state->crtc == &crtc->base ||
new_conn_state->crtc == &crtc->base)
return connector;
}
return NULL;
}
/**
* intel_dp_mst_crtc_needs_modeset - check if changes in topology need to modeset the given CRTC
* @state: atomic state
* @crtc: CRTC for which to check the modeset requirement
*
* Check if any change in a MST topology requires a forced modeset on @crtc in
* this topology. One such change is enabling/disabling the DSC decompression
* state in the first branch device's UFP DPCD as required by one CRTC, while
* the other @crtc in the same topology is still active, requiring a full modeset
* on @crtc.
*/
bool intel_dp_mst_crtc_needs_modeset(struct intel_atomic_state *state,
struct intel_crtc *crtc)
{
const struct intel_connector *crtc_connector;
const struct drm_connector_state *conn_state;
const struct drm_connector *_connector;
int i;
if (!intel_crtc_has_type(intel_atomic_get_new_crtc_state(state, crtc),
INTEL_OUTPUT_DP_MST))
return false;
crtc_connector = get_connector_in_state_for_crtc(state, crtc);
if (!crtc_connector)
/* None of the connectors in the topology needs modeset */
return false;
for_each_new_connector_in_state(&state->base, _connector, conn_state, i) {
const struct intel_connector *connector =
to_intel_connector(_connector);
const struct intel_crtc_state *new_crtc_state;
const struct intel_crtc_state *old_crtc_state;
struct intel_crtc *crtc_iter;
if (connector->mst_port != crtc_connector->mst_port ||
!conn_state->crtc)
continue;
crtc_iter = to_intel_crtc(conn_state->crtc);
new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc_iter);
old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc_iter);
if (!intel_crtc_needs_modeset(new_crtc_state))
continue;
if (old_crtc_state->dsc.compression_enable ==
new_crtc_state->dsc.compression_enable)
continue;
/*
* Toggling the decompression flag because of this stream in
* the first downstream branch device's UFP DPCD may reset the
* whole branch device. To avoid the reset while other streams
* are also active modeset the whole MST topology in this
* case.
*/
if (connector->dp.dsc_decompression_aux ==
&connector->mst_port->aux)
return true;
}
return false;
}
/**
* intel_dp_mst_prepare_probe - Prepare an MST link for topology probing
* @intel_dp: DP port object
*
* Prepare an MST link for topology probing, programming the target
* link parameters to DPCD. This step is a requirement of the enumaration
* of path resources during probing.
*/
void intel_dp_mst_prepare_probe(struct intel_dp *intel_dp)
{
int link_rate = intel_dp_max_link_rate(intel_dp);
int lane_count = intel_dp_max_lane_count(intel_dp);
u8 rate_select;
u8 link_bw;
if (intel_dp->link_trained)
return;
if (intel_mst_probed_link_params_valid(intel_dp, link_rate, lane_count))
return;
intel_dp_compute_rate(intel_dp, link_rate, &link_bw, &rate_select);
intel_dp_link_training_set_mode(intel_dp, link_rate, false);
intel_dp_link_training_set_bw(intel_dp, link_bw, rate_select, lane_count,
drm_dp_enhanced_frame_cap(intel_dp->dpcd));
intel_mst_set_probed_link_params(intel_dp, link_rate, lane_count);
}
/*
* intel_dp_mst_verify_dpcd_state - verify the MST SW enabled state wrt. the DPCD
* @intel_dp: DP port object
*
* Verify if @intel_dp's MST enabled SW state matches the corresponding DPCD
* state. A long HPD pulse - not long enough to be detected as a disconnected
* state - could've reset the DPCD state, which requires tearing
* down/recreating the MST topology.
*
* Returns %true if the SW MST enabled and DPCD states match, %false
* otherwise.
*/
bool intel_dp_mst_verify_dpcd_state(struct intel_dp *intel_dp)
{
struct intel_display *display = to_intel_display(intel_dp);
struct intel_connector *connector = intel_dp->attached_connector;
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *encoder = &dig_port->base;
int ret;
u8 val;
if (!intel_dp->is_mst)
return true;
ret = drm_dp_dpcd_readb(intel_dp->mst_mgr.aux, DP_MSTM_CTRL, &val);
/* Adjust the expected register value for SST + SideBand. */
if (ret < 0 || val != (DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC)) {
drm_dbg_kms(display->drm,
"[CONNECTOR:%d:%s][ENCODER:%d:%s] MST mode got reset, removing topology (ret=%d, ctrl=0x%02x)\n",
connector->base.base.id, connector->base.name,
encoder->base.base.id, encoder->base.name,
ret, val);
return false;
}
return true;
}
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