// SPDX-License-Identifier: MIT
#include <drm/drm_atomic.h>
#include <drm/drm_connector.h>
#include <drm/drm_edid.h>
#include <drm/drm_print.h>
#include <drm/display/drm_hdmi_helper.h>
#include <drm/display/drm_hdmi_state_helper.h>
/**
* __drm_atomic_helper_connector_hdmi_reset() - Initializes all HDMI @drm_connector_state resources
* @connector: DRM connector
* @new_conn_state: connector state to reset
*
* Initializes all HDMI resources from a @drm_connector_state without
* actually allocating it. This is useful for HDMI drivers, in
* combination with __drm_atomic_helper_connector_reset() or
* drm_atomic_helper_connector_reset().
*/
void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector,
struct drm_connector_state *new_conn_state)
{
unsigned int max_bpc = connector->max_bpc;
new_conn_state->max_bpc = max_bpc;
new_conn_state->max_requested_bpc = max_bpc;
new_conn_state->hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
}
EXPORT_SYMBOL(__drm_atomic_helper_connector_hdmi_reset);
static const struct drm_display_mode *
connector_state_get_mode(const struct drm_connector_state *conn_state)
{
struct drm_atomic_state *state;
struct drm_crtc_state *crtc_state;
struct drm_crtc *crtc;
state = conn_state->state;
if (!state)
return NULL;
crtc = conn_state->crtc;
if (!crtc)
return NULL;
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
if (!crtc_state)
return NULL;
return &crtc_state->mode;
}
static bool hdmi_is_limited_range(const struct drm_connector *connector,
const struct drm_connector_state *conn_state)
{
const struct drm_display_info *info = &connector->display_info;
const struct drm_display_mode *mode =
connector_state_get_mode(conn_state);
/*
* The Broadcast RGB property only applies to RGB format, and
* i915 just assumes limited range for YCbCr output, so let's
* just do the same.
*/
if (conn_state->hdmi.output_format != HDMI_COLORSPACE_RGB)
return true;
if (conn_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_FULL)
return false;
if (conn_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_LIMITED)
return true;
if (!info->is_hdmi)
return false;
return drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED;
}
static bool
sink_supports_format_bpc(const struct drm_connector *connector,
const struct drm_display_info *info,
const struct drm_display_mode *mode,
unsigned int format, unsigned int bpc)
{
struct drm_device *dev = connector->dev;
u8 vic = drm_match_cea_mode(mode);
/*
* CTA-861-F, section 5.4 - Color Coding & Quantization states
* that the bpc must be 8, 10, 12 or 16 except for the default
* 640x480 VIC1 where the value must be 8.
*
* The definition of default here is ambiguous but the spec
* refers to VIC1 being the default timing in several occasions
* so our understanding is that for the default timing (ie,
* VIC1), the bpc must be 8.
*/
if (vic == 1 && bpc != 8) {
drm_dbg_kms(dev, "VIC1 requires a bpc of 8, got %u\n", bpc);
return false;
}
if (!info->is_hdmi &&
(format != HDMI_COLORSPACE_RGB || bpc != 8)) {
drm_dbg_kms(dev, "DVI Monitors require an RGB output at 8 bpc\n");
return false;
}
if (!(connector->hdmi.supported_formats & BIT(format))) {
drm_dbg_kms(dev, "%s format unsupported by the connector.\n",
drm_hdmi_connector_get_output_format_name(format));
return false;
}
switch (format) {
case HDMI_COLORSPACE_RGB:
drm_dbg_kms(dev, "RGB Format, checking the constraints.\n");
/*
* In some cases, like when the EDID readout fails, or
* is not an HDMI compliant EDID for some reason, the
* color_formats field will be blank and not report any
* format supported. In such a case, assume that RGB is
* supported so we can keep things going and light up
* the display.
*/
if (!(info->color_formats & DRM_COLOR_FORMAT_RGB444))
drm_warn(dev, "HDMI Sink doesn't support RGB, something's wrong.\n");
if (bpc == 10 && !(info->edid_hdmi_rgb444_dc_modes & DRM_EDID_HDMI_DC_30)) {
drm_dbg_kms(dev, "10 BPC but sink doesn't support Deep Color 30.\n");
return false;
}
if (bpc == 12 && !(info->edid_hdmi_rgb444_dc_modes & DRM_EDID_HDMI_DC_36)) {
drm_dbg_kms(dev, "12 BPC but sink doesn't support Deep Color 36.\n");
return false;
}
drm_dbg_kms(dev, "RGB format supported in that configuration.\n");
return true;
case HDMI_COLORSPACE_YUV420:
/* TODO: YUV420 is unsupported at the moment. */
drm_dbg_kms(dev, "YUV420 format isn't supported yet.\n");
return false;
case HDMI_COLORSPACE_YUV422:
drm_dbg_kms(dev, "YUV422 format, checking the constraints.\n");
if (!(info->color_formats & DRM_COLOR_FORMAT_YCBCR422)) {
drm_dbg_kms(dev, "Sink doesn't support YUV422.\n");
return false;
}
if (bpc > 12) {
drm_dbg_kms(dev, "YUV422 only supports 12 bpc or lower.\n");
return false;
}
/*
* HDMI Spec 1.3 - Section 6.5 Pixel Encodings and Color Depth
* states that Deep Color is not relevant for YUV422 so we
* don't need to check the Deep Color bits in the EDIDs here.
*/
drm_dbg_kms(dev, "YUV422 format supported in that configuration.\n");
return true;
case HDMI_COLORSPACE_YUV444:
drm_dbg_kms(dev, "YUV444 format, checking the constraints.\n");
if (!(info->color_formats & DRM_COLOR_FORMAT_YCBCR444)) {
drm_dbg_kms(dev, "Sink doesn't support YUV444.\n");
return false;
}
if (bpc == 10 && !(info->edid_hdmi_ycbcr444_dc_modes & DRM_EDID_HDMI_DC_30)) {
drm_dbg_kms(dev, "10 BPC but sink doesn't support Deep Color 30.\n");
return false;
}
if (bpc == 12 && !(info->edid_hdmi_ycbcr444_dc_modes & DRM_EDID_HDMI_DC_36)) {
drm_dbg_kms(dev, "12 BPC but sink doesn't support Deep Color 36.\n");
return false;
}
drm_dbg_kms(dev, "YUV444 format supported in that configuration.\n");
return true;
}
drm_dbg_kms(dev, "Unsupported pixel format.\n");
return false;
}
static enum drm_mode_status
hdmi_clock_valid(const struct drm_connector *connector,
const struct drm_display_mode *mode,
unsigned long long clock)
{
const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs;
const struct drm_display_info *info = &connector->display_info;
if (info->max_tmds_clock && clock > info->max_tmds_clock * 1000)
return MODE_CLOCK_HIGH;
if (funcs && funcs->tmds_char_rate_valid) {
enum drm_mode_status status;
status = funcs->tmds_char_rate_valid(connector, mode, clock);
if (status != MODE_OK)
return status;
}
return MODE_OK;
}
static int
hdmi_compute_clock(const struct drm_connector *connector,
struct drm_connector_state *conn_state,
const struct drm_display_mode *mode,
unsigned int bpc, enum hdmi_colorspace fmt)
{
enum drm_mode_status status;
unsigned long long clock;
clock = drm_hdmi_compute_mode_clock(mode, bpc, fmt);
if (!clock)
return -EINVAL;
status = hdmi_clock_valid(connector, mode, clock);
if (status != MODE_OK)
return -EINVAL;
conn_state->hdmi.tmds_char_rate = clock;
return 0;
}
static bool
hdmi_try_format_bpc(const struct drm_connector *connector,
struct drm_connector_state *conn_state,
const struct drm_display_mode *mode,
unsigned int bpc, enum hdmi_colorspace fmt)
{
const struct drm_display_info *info = &connector->display_info;
struct drm_device *dev = connector->dev;
int ret;
drm_dbg_kms(dev, "Trying %s output format\n",
drm_hdmi_connector_get_output_format_name(fmt));
if (!sink_supports_format_bpc(connector, info, mode, fmt, bpc)) {
drm_dbg_kms(dev, "%s output format not supported with %u bpc\n",
drm_hdmi_connector_get_output_format_name(fmt),
bpc);
return false;
}
ret = hdmi_compute_clock(connector, conn_state, mode, bpc, fmt);
if (ret) {
drm_dbg_kms(dev, "Couldn't compute clock for %s output format and %u bpc\n",
drm_hdmi_connector_get_output_format_name(fmt),
bpc);
return false;
}
drm_dbg_kms(dev, "%s output format supported with %u (TMDS char rate: %llu Hz)\n",
drm_hdmi_connector_get_output_format_name(fmt),
bpc, conn_state->hdmi.tmds_char_rate);
return true;
}
static int
hdmi_compute_format(const struct drm_connector *connector,
struct drm_connector_state *conn_state,
const struct drm_display_mode *mode,
unsigned int bpc)
{
struct drm_device *dev = connector->dev;
/*
* TODO: Add support for YCbCr420 output for HDMI 2.0 capable
* devices, for modes that only support YCbCr420.
*/
if (hdmi_try_format_bpc(connector, conn_state, mode, bpc, HDMI_COLORSPACE_RGB)) {
conn_state->hdmi.output_format = HDMI_COLORSPACE_RGB;
return 0;
}
drm_dbg_kms(dev, "Failed. No Format Supported for that bpc count.\n");
return -EINVAL;
}
static int
hdmi_compute_config(const struct drm_connector *connector,
struct drm_connector_state *conn_state,
const struct drm_display_mode *mode)
{
struct drm_device *dev = connector->dev;
unsigned int max_bpc = clamp_t(unsigned int,
conn_state->max_bpc,
8, connector->max_bpc);
unsigned int bpc;
int ret;
for (bpc = max_bpc; bpc >= 8; bpc -= 2) {
drm_dbg_kms(dev, "Trying with a %d bpc output\n", bpc);
ret = hdmi_compute_format(connector, conn_state, mode, bpc);
if (ret)
continue;
conn_state->hdmi.output_bpc = bpc;
drm_dbg_kms(dev,
"Mode %ux%u @ %uHz: Found configuration: bpc: %u, fmt: %s, clock: %llu\n",
mode->hdisplay, mode->vdisplay, drm_mode_vrefresh(mode),
conn_state->hdmi.output_bpc,
drm_hdmi_connector_get_output_format_name(conn_state->hdmi.output_format),
conn_state->hdmi.tmds_char_rate);
return 0;
}
return -EINVAL;
}
static int hdmi_generate_avi_infoframe(const struct drm_connector *connector,
struct drm_connector_state *conn_state)
{
const struct drm_display_mode *mode =
connector_state_get_mode(conn_state);
struct drm_connector_hdmi_infoframe *infoframe =
&conn_state->hdmi.infoframes.avi;
struct hdmi_avi_infoframe *frame =
&infoframe->data.avi;
bool is_limited_range = conn_state->hdmi.is_limited_range;
enum hdmi_quantization_range rgb_quant_range =
is_limited_range ? HDMI_QUANTIZATION_RANGE_LIMITED : HDMI_QUANTIZATION_RANGE_FULL;
int ret;
ret = drm_hdmi_avi_infoframe_from_display_mode(frame, connector, mode);
if (ret)
return ret;
frame->colorspace = conn_state->hdmi.output_format;
/*
* FIXME: drm_hdmi_avi_infoframe_quant_range() doesn't handle
* YUV formats at all at the moment, so if we ever support YUV
* formats this needs to be revised.
*/
drm_hdmi_avi_infoframe_quant_range(frame, connector, mode, rgb_quant_range);
drm_hdmi_avi_infoframe_colorimetry(frame, conn_state);
drm_hdmi_avi_infoframe_bars(frame, conn_state);
infoframe->set = true;
return 0;
}
static int hdmi_generate_spd_infoframe(const struct drm_connector *connector,
struct drm_connector_state *conn_state)
{
struct drm_connector_hdmi_infoframe *infoframe =
&conn_state->hdmi.infoframes.spd;
struct hdmi_spd_infoframe *frame =
&infoframe->data.spd;
int ret;
ret = hdmi_spd_infoframe_init(frame,
connector->hdmi.vendor,
connector->hdmi.product);
if (ret)
return ret;
frame->sdi = HDMI_SPD_SDI_PC;
infoframe->set = true;
return 0;
}
static int hdmi_generate_hdr_infoframe(const struct drm_connector *connector,
struct drm_connector_state *conn_state)
{
struct drm_connector_hdmi_infoframe *infoframe =
&conn_state->hdmi.infoframes.hdr_drm;
struct hdmi_drm_infoframe *frame =
&infoframe->data.drm;
int ret;
if (connector->max_bpc < 10)
return 0;
if (!conn_state->hdr_output_metadata)
return 0;
ret = drm_hdmi_infoframe_set_hdr_metadata(frame, conn_state);
if (ret)
return ret;
infoframe->set = true;
return 0;
}
static int hdmi_generate_hdmi_vendor_infoframe(const struct drm_connector *connector,
struct drm_connector_state *conn_state)
{
const struct drm_display_info *info = &connector->display_info;
const struct drm_display_mode *mode =
connector_state_get_mode(conn_state);
struct drm_connector_hdmi_infoframe *infoframe =
&conn_state->hdmi.infoframes.hdmi;
struct hdmi_vendor_infoframe *frame =
&infoframe->data.vendor.hdmi;
int ret;
if (!info->has_hdmi_infoframe)
return 0;
ret = drm_hdmi_vendor_infoframe_from_display_mode(frame, connector, mode);
if (ret)
return ret;
infoframe->set = true;
return 0;
}
static int
hdmi_generate_infoframes(const struct drm_connector *connector,
struct drm_connector_state *conn_state)
{
const struct drm_display_info *info = &connector->display_info;
int ret;
if (!info->is_hdmi)
return 0;
ret = hdmi_generate_avi_infoframe(connector, conn_state);
if (ret)
return ret;
ret = hdmi_generate_spd_infoframe(connector, conn_state);
if (ret)
return ret;
/*
* Audio Infoframes will be generated by ALSA, and updated by
* drm_atomic_helper_connector_hdmi_update_audio_infoframe().
*/
ret = hdmi_generate_hdr_infoframe(connector, conn_state);
if (ret)
return ret;
ret = hdmi_generate_hdmi_vendor_infoframe(connector, conn_state);
if (ret)
return ret;
return 0;
}
/**
* drm_atomic_helper_connector_hdmi_check() - Helper to check HDMI connector atomic state
* @connector: DRM Connector
* @state: the DRM State object
*
* Provides a default connector state check handler for HDMI connectors.
* Checks that a desired connector update is valid, and updates various
* fields of derived state.
*
* RETURNS:
* Zero on success, or an errno code otherwise.
*/
int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct drm_connector_state *old_conn_state =
drm_atomic_get_old_connector_state(state, connector);
struct drm_connector_state *new_conn_state =
drm_atomic_get_new_connector_state(state, connector);
const struct drm_display_mode *mode =
connector_state_get_mode(new_conn_state);
int ret;
new_conn_state->hdmi.is_limited_range = hdmi_is_limited_range(connector, new_conn_state);
ret = hdmi_compute_config(connector, new_conn_state, mode);
if (ret)
return ret;
ret = hdmi_generate_infoframes(connector, new_conn_state);
if (ret)
return ret;
if (old_conn_state->hdmi.broadcast_rgb != new_conn_state->hdmi.broadcast_rgb ||
old_conn_state->hdmi.output_bpc != new_conn_state->hdmi.output_bpc ||
old_conn_state->hdmi.output_format != new_conn_state->hdmi.output_format) {
struct drm_crtc *crtc = new_conn_state->crtc;
struct drm_crtc_state *crtc_state;
crtc_state = drm_atomic_get_crtc_state(state, crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
crtc_state->mode_changed = true;
}
return 0;
}
EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check);
static int clear_device_infoframe(struct drm_connector *connector,
enum hdmi_infoframe_type type)
{
const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs;
struct drm_device *dev = connector->dev;
int ret;
drm_dbg_kms(dev, "Clearing infoframe type 0x%x\n", type);
if (!funcs || !funcs->clear_infoframe) {
drm_dbg_kms(dev, "Function not implemented, bailing.\n");
return 0;
}
ret = funcs->clear_infoframe(connector, type);
if (ret) {
drm_dbg_kms(dev, "Call failed: %d\n", ret);
return ret;
}
return 0;
}
static int clear_infoframe(struct drm_connector *connector,
struct drm_connector_hdmi_infoframe *old_frame)
{
int ret;
ret = clear_device_infoframe(connector, old_frame->data.any.type);
if (ret)
return ret;
return 0;
}
static int write_device_infoframe(struct drm_connector *connector,
union hdmi_infoframe *frame)
{
const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs;
struct drm_device *dev = connector->dev;
u8 buffer[HDMI_INFOFRAME_SIZE(MAX)];
int ret;
int len;
drm_dbg_kms(dev, "Writing infoframe type %x\n", frame->any.type);
if (!funcs || !funcs->write_infoframe) {
drm_dbg_kms(dev, "Function not implemented, bailing.\n");
return -EINVAL;
}
len = hdmi_infoframe_pack(frame, buffer, sizeof(buffer));
if (len < 0)
return len;
ret = funcs->write_infoframe(connector, frame->any.type, buffer, len);
if (ret) {
drm_dbg_kms(dev, "Call failed: %d\n", ret);
return ret;
}
return 0;
}
static int write_infoframe(struct drm_connector *connector,
struct drm_connector_hdmi_infoframe *new_frame)
{
int ret;
ret = write_device_infoframe(connector, &new_frame->data);
if (ret)
return ret;
return 0;
}
static int write_or_clear_infoframe(struct drm_connector *connector,
struct drm_connector_hdmi_infoframe *old_frame,
struct drm_connector_hdmi_infoframe *new_frame)
{
if (new_frame->set)
return write_infoframe(connector, new_frame);
if (old_frame->set && !new_frame->set)
return clear_infoframe(connector, old_frame);
return 0;
}
/**
* drm_atomic_helper_connector_hdmi_update_infoframes - Update the Infoframes
* @connector: A pointer to the HDMI connector
* @state: The HDMI connector state to generate the infoframe from
*
* This function is meant for HDMI connector drivers to write their
* infoframes. It will typically be used in a
* @drm_connector_helper_funcs.atomic_enable implementation.
*
* Returns:
* Zero on success, error code on failure.
*/
int drm_atomic_helper_connector_hdmi_update_infoframes(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct drm_connector_state *old_conn_state =
drm_atomic_get_old_connector_state(state, connector);
struct drm_connector_state *new_conn_state =
drm_atomic_get_new_connector_state(state, connector);
struct drm_display_info *info = &connector->display_info;
int ret;
if (!info->is_hdmi)
return 0;
mutex_lock(&connector->hdmi.infoframes.lock);
ret = write_or_clear_infoframe(connector,
&old_conn_state->hdmi.infoframes.avi,
&new_conn_state->hdmi.infoframes.avi);
if (ret)
goto out;
if (connector->hdmi.infoframes.audio.set) {
ret = write_infoframe(connector,
&connector->hdmi.infoframes.audio);
if (ret)
goto out;
}
ret = write_or_clear_infoframe(connector,
&old_conn_state->hdmi.infoframes.hdr_drm,
&new_conn_state->hdmi.infoframes.hdr_drm);
if (ret)
goto out;
ret = write_or_clear_infoframe(connector,
&old_conn_state->hdmi.infoframes.spd,
&new_conn_state->hdmi.infoframes.spd);
if (ret)
goto out;
if (info->has_hdmi_infoframe) {
ret = write_or_clear_infoframe(connector,
&old_conn_state->hdmi.infoframes.hdmi,
&new_conn_state->hdmi.infoframes.hdmi);
if (ret)
goto out;
}
out:
mutex_unlock(&connector->hdmi.infoframes.lock);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_infoframes);
/**
* drm_atomic_helper_connector_hdmi_update_audio_infoframe - Update the Audio Infoframe
* @connector: A pointer to the HDMI connector
* @frame: A pointer to the audio infoframe to write
*
* This function is meant for HDMI connector drivers to update their
* audio infoframe. It will typically be used in one of the ALSA hooks
* (most likely prepare).
*
* Returns:
* Zero on success, error code on failure.
*/
int
drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *connector,
struct hdmi_audio_infoframe *frame)
{
struct drm_connector_hdmi_infoframe *infoframe =
&connector->hdmi.infoframes.audio;
struct drm_display_info *info = &connector->display_info;
int ret;
if (!info->is_hdmi)
return 0;
mutex_lock(&connector->hdmi.infoframes.lock);
memcpy(&infoframe->data, frame, sizeof(infoframe->data));
infoframe->set = true;
ret = write_infoframe(connector, infoframe);
mutex_unlock(&connector->hdmi.infoframes.lock);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_audio_infoframe);
/**
* drm_atomic_helper_connector_hdmi_clear_audio_infoframe - Stop sending the Audio Infoframe
* @connector: A pointer to the HDMI connector
*
* This function is meant for HDMI connector drivers to stop sending their
* audio infoframe. It will typically be used in one of the ALSA hooks
* (most likely shutdown).
*
* Returns:
* Zero on success, error code on failure.
*/
int
drm_atomic_helper_connector_hdmi_clear_audio_infoframe(struct drm_connector *connector)
{
struct drm_connector_hdmi_infoframe *infoframe =
&connector->hdmi.infoframes.audio;
struct drm_display_info *info = &connector->display_info;
int ret;
if (!info->is_hdmi)
return 0;
mutex_lock(&connector->hdmi.infoframes.lock);
infoframe->set = false;
ret = clear_infoframe(connector, infoframe);
memset(&infoframe->data, 0, sizeof(infoframe->data));
mutex_unlock(&connector->hdmi.infoframes.lock);
return ret;
}
EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_clear_audio_infoframe);
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