// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
*/
#define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
#include <drm/drm_print.h>
#include "dp_reg.h"
#include "dp_link.h"
#include "dp_panel.h"
#define DP_TEST_REQUEST_MASK 0x7F
enum audio_sample_rate {
AUDIO_SAMPLE_RATE_32_KHZ = 0x00,
AUDIO_SAMPLE_RATE_44_1_KHZ = 0x01,
AUDIO_SAMPLE_RATE_48_KHZ = 0x02,
AUDIO_SAMPLE_RATE_88_2_KHZ = 0x03,
AUDIO_SAMPLE_RATE_96_KHZ = 0x04,
AUDIO_SAMPLE_RATE_176_4_KHZ = 0x05,
AUDIO_SAMPLE_RATE_192_KHZ = 0x06,
};
enum audio_pattern_type {
AUDIO_TEST_PATTERN_OPERATOR_DEFINED = 0x00,
AUDIO_TEST_PATTERN_SAWTOOTH = 0x01,
};
struct dp_link_request {
u32 test_requested;
u32 test_link_rate;
u32 test_lane_count;
};
struct dp_link_private {
u32 prev_sink_count;
struct drm_device *drm_dev;
struct drm_dp_aux *aux;
struct dp_link dp_link;
struct dp_link_request request;
struct mutex psm_mutex;
u8 link_status[DP_LINK_STATUS_SIZE];
};
static int dp_aux_link_power_up(struct drm_dp_aux *aux,
struct dp_link_info *link)
{
u8 value;
ssize_t len;
int i;
if (link->revision < 0x11)
return 0;
len = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
if (len < 0)
return len;
value &= ~DP_SET_POWER_MASK;
value |= DP_SET_POWER_D0;
/* retry for 1ms to give the sink time to wake up */
for (i = 0; i < 3; i++) {
len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
usleep_range(1000, 2000);
if (len == 1)
break;
}
return 0;
}
static int dp_aux_link_power_down(struct drm_dp_aux *aux,
struct dp_link_info *link)
{
u8 value;
int err;
if (link->revision < 0x11)
return 0;
err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
if (err < 0)
return err;
value &= ~DP_SET_POWER_MASK;
value |= DP_SET_POWER_D3;
err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
if (err < 0)
return err;
return 0;
}
static int dp_link_get_period(struct dp_link_private *link, int const addr)
{
int ret = 0;
u8 data;
u32 const max_audio_period = 0xA;
/* TEST_AUDIO_PERIOD_CH_XX */
if (drm_dp_dpcd_readb(link->aux, addr, &data) < 0) {
DRM_ERROR("failed to read test_audio_period (0x%x)\n", addr);
ret = -EINVAL;
goto exit;
}
/* Period - Bits 3:0 */
data = data & 0xF;
if ((int)data > max_audio_period) {
DRM_ERROR("invalid test_audio_period_ch_1 = 0x%x\n", data);
ret = -EINVAL;
goto exit;
}
ret = data;
exit:
return ret;
}
static int dp_link_parse_audio_channel_period(struct dp_link_private *link)
{
int ret = 0;
struct dp_link_test_audio *req = &link->dp_link.test_audio;
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH1);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_1 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_1 = 0x%x\n", ret);
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH2);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_2 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_2 = 0x%x\n", ret);
/* TEST_AUDIO_PERIOD_CH_3 (Byte 0x275) */
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH3);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_3 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_3 = 0x%x\n", ret);
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH4);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_4 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_4 = 0x%x\n", ret);
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH5);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_5 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_5 = 0x%x\n", ret);
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH6);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_6 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_6 = 0x%x\n", ret);
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH7);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_7 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_7 = 0x%x\n", ret);
ret = dp_link_get_period(link, DP_TEST_AUDIO_PERIOD_CH8);
if (ret == -EINVAL)
goto exit;
req->test_audio_period_ch_8 = ret;
drm_dbg_dp(link->drm_dev, "test_audio_period_ch_8 = 0x%x\n", ret);
exit:
return ret;
}
static int dp_link_parse_audio_pattern_type(struct dp_link_private *link)
{
int ret = 0;
u8 data;
ssize_t rlen;
int const max_audio_pattern_type = 0x1;
rlen = drm_dp_dpcd_readb(link->aux,
DP_TEST_AUDIO_PATTERN_TYPE, &data);
if (rlen < 0) {
DRM_ERROR("failed to read link audio mode. rlen=%zd\n", rlen);
return rlen;
}
/* Audio Pattern Type - Bits 7:0 */
if ((int)data > max_audio_pattern_type) {
DRM_ERROR("invalid audio pattern type = 0x%x\n", data);
ret = -EINVAL;
goto exit;
}
link->dp_link.test_audio.test_audio_pattern_type = data;
drm_dbg_dp(link->drm_dev, "audio pattern type = 0x%x\n", data);
exit:
return ret;
}
static int dp_link_parse_audio_mode(struct dp_link_private *link)
{
int ret = 0;
u8 data;
ssize_t rlen;
int const max_audio_sampling_rate = 0x6;
int const max_audio_channel_count = 0x8;
int sampling_rate = 0x0;
int channel_count = 0x0;
rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_AUDIO_MODE, &data);
if (rlen < 0) {
DRM_ERROR("failed to read link audio mode. rlen=%zd\n", rlen);
return rlen;
}
/* Sampling Rate - Bits 3:0 */
sampling_rate = data & 0xF;
if (sampling_rate > max_audio_sampling_rate) {
DRM_ERROR("sampling rate (0x%x) greater than max (0x%x)\n",
sampling_rate, max_audio_sampling_rate);
ret = -EINVAL;
goto exit;
}
/* Channel Count - Bits 7:4 */
channel_count = ((data & 0xF0) >> 4) + 1;
if (channel_count > max_audio_channel_count) {
DRM_ERROR("channel_count (0x%x) greater than max (0x%x)\n",
channel_count, max_audio_channel_count);
ret = -EINVAL;
goto exit;
}
link->dp_link.test_audio.test_audio_sampling_rate = sampling_rate;
link->dp_link.test_audio.test_audio_channel_count = channel_count;
drm_dbg_dp(link->drm_dev,
"sampling_rate = 0x%x, channel_count = 0x%x\n",
sampling_rate, channel_count);
exit:
return ret;
}
static int dp_link_parse_audio_pattern_params(struct dp_link_private *link)
{
int ret = 0;
ret = dp_link_parse_audio_mode(link);
if (ret)
goto exit;
ret = dp_link_parse_audio_pattern_type(link);
if (ret)
goto exit;
ret = dp_link_parse_audio_channel_period(link);
exit:
return ret;
}
static bool dp_link_is_video_pattern_valid(u32 pattern)
{
switch (pattern) {
case DP_NO_TEST_PATTERN:
case DP_COLOR_RAMP:
case DP_BLACK_AND_WHITE_VERTICAL_LINES:
case DP_COLOR_SQUARE:
return true;
default:
return false;
}
}
/**
* dp_link_is_bit_depth_valid() - validates the bit depth requested
* @tbd: bit depth requested by the sink
*
* Returns true if the requested bit depth is supported.
*/
static bool dp_link_is_bit_depth_valid(u32 tbd)
{
/* DP_TEST_VIDEO_PATTERN_NONE is treated as invalid */
switch (tbd) {
case DP_TEST_BIT_DEPTH_6:
case DP_TEST_BIT_DEPTH_8:
case DP_TEST_BIT_DEPTH_10:
return true;
default:
return false;
}
}
static int dp_link_parse_timing_params1(struct dp_link_private *link,
int addr, int len, u32 *val)
{
u8 bp[2];
int rlen;
if (len != 2)
return -EINVAL;
/* Read the requested video link pattern (Byte 0x221). */
rlen = drm_dp_dpcd_read(link->aux, addr, bp, len);
if (rlen < len) {
DRM_ERROR("failed to read 0x%x\n", addr);
return -EINVAL;
}
*val = bp[1] | (bp[0] << 8);
return 0;
}
static int dp_link_parse_timing_params2(struct dp_link_private *link,
int addr, int len,
u32 *val1, u32 *val2)
{
u8 bp[2];
int rlen;
if (len != 2)
return -EINVAL;
/* Read the requested video link pattern (Byte 0x221). */
rlen = drm_dp_dpcd_read(link->aux, addr, bp, len);
if (rlen < len) {
DRM_ERROR("failed to read 0x%x\n", addr);
return -EINVAL;
}
*val1 = (bp[0] & BIT(7)) >> 7;
*val2 = bp[1] | ((bp[0] & 0x7F) << 8);
return 0;
}
static int dp_link_parse_timing_params3(struct dp_link_private *link,
int addr, u32 *val)
{
u8 bp;
u32 len = 1;
int rlen;
rlen = drm_dp_dpcd_read(link->aux, addr, &bp, len);
if (rlen < 1) {
DRM_ERROR("failed to read 0x%x\n", addr);
return -EINVAL;
}
*val = bp;
return 0;
}
/**
* dp_link_parse_video_pattern_params() - parses video pattern parameters from DPCD
* @link: Display Port Driver data
*
* Returns 0 if it successfully parses the video link pattern and the link
* bit depth requested by the sink and, and if the values parsed are valid.
*/
static int dp_link_parse_video_pattern_params(struct dp_link_private *link)
{
int ret = 0;
ssize_t rlen;
u8 bp;
rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_PATTERN, &bp);
if (rlen < 0) {
DRM_ERROR("failed to read link video pattern. rlen=%zd\n",
rlen);
return rlen;
}
if (!dp_link_is_video_pattern_valid(bp)) {
DRM_ERROR("invalid link video pattern = 0x%x\n", bp);
ret = -EINVAL;
return ret;
}
link->dp_link.test_video.test_video_pattern = bp;
/* Read the requested color bit depth and dynamic range (Byte 0x232) */
rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_MISC0, &bp);
if (rlen < 0) {
DRM_ERROR("failed to read link bit depth. rlen=%zd\n", rlen);
return rlen;
}
/* Dynamic Range */
link->dp_link.test_video.test_dyn_range =
(bp & DP_TEST_DYNAMIC_RANGE_CEA);
/* Color bit depth */
bp &= DP_TEST_BIT_DEPTH_MASK;
if (!dp_link_is_bit_depth_valid(bp)) {
DRM_ERROR("invalid link bit depth = 0x%x\n", bp);
ret = -EINVAL;
return ret;
}
link->dp_link.test_video.test_bit_depth = bp;
/* resolution timing params */
ret = dp_link_parse_timing_params1(link, DP_TEST_H_TOTAL_HI, 2,
&link->dp_link.test_video.test_h_total);
if (ret) {
DRM_ERROR("failed to parse test_htotal(DP_TEST_H_TOTAL_HI)\n");
return ret;
}
ret = dp_link_parse_timing_params1(link, DP_TEST_V_TOTAL_HI, 2,
&link->dp_link.test_video.test_v_total);
if (ret) {
DRM_ERROR("failed to parse test_v_total(DP_TEST_V_TOTAL_HI)\n");
return ret;
}
ret = dp_link_parse_timing_params1(link, DP_TEST_H_START_HI, 2,
&link->dp_link.test_video.test_h_start);
if (ret) {
DRM_ERROR("failed to parse test_h_start(DP_TEST_H_START_HI)\n");
return ret;
}
ret = dp_link_parse_timing_params1(link, DP_TEST_V_START_HI, 2,
&link->dp_link.test_video.test_v_start);
if (ret) {
DRM_ERROR("failed to parse test_v_start(DP_TEST_V_START_HI)\n");
return ret;
}
ret = dp_link_parse_timing_params2(link, DP_TEST_HSYNC_HI, 2,
&link->dp_link.test_video.test_hsync_pol,
&link->dp_link.test_video.test_hsync_width);
if (ret) {
DRM_ERROR("failed to parse (DP_TEST_HSYNC_HI)\n");
return ret;
}
ret = dp_link_parse_timing_params2(link, DP_TEST_VSYNC_HI, 2,
&link->dp_link.test_video.test_vsync_pol,
&link->dp_link.test_video.test_vsync_width);
if (ret) {
DRM_ERROR("failed to parse (DP_TEST_VSYNC_HI)\n");
return ret;
}
ret = dp_link_parse_timing_params1(link, DP_TEST_H_WIDTH_HI, 2,
&link->dp_link.test_video.test_h_width);
if (ret) {
DRM_ERROR("failed to parse test_h_width(DP_TEST_H_WIDTH_HI)\n");
return ret;
}
ret = dp_link_parse_timing_params1(link, DP_TEST_V_HEIGHT_HI, 2,
&link->dp_link.test_video.test_v_height);
if (ret) {
DRM_ERROR("failed to parse test_v_height\n");
return ret;
}
ret = dp_link_parse_timing_params3(link, DP_TEST_MISC1,
&link->dp_link.test_video.test_rr_d);
link->dp_link.test_video.test_rr_d &= DP_TEST_REFRESH_DENOMINATOR;
if (ret) {
DRM_ERROR("failed to parse test_rr_d (DP_TEST_MISC1)\n");
return ret;
}
ret = dp_link_parse_timing_params3(link, DP_TEST_REFRESH_RATE_NUMERATOR,
&link->dp_link.test_video.test_rr_n);
if (ret) {
DRM_ERROR("failed to parse test_rr_n\n");
return ret;
}
drm_dbg_dp(link->drm_dev,
"link video pattern = 0x%x\n"
"link dynamic range = 0x%x\n"
"link bit depth = 0x%x\n"
"TEST_H_TOTAL = %d, TEST_V_TOTAL = %d\n"
"TEST_H_START = %d, TEST_V_START = %d\n"
"TEST_HSYNC_POL = %d\n"
"TEST_HSYNC_WIDTH = %d\n"
"TEST_VSYNC_POL = %d\n"
"TEST_VSYNC_WIDTH = %d\n"
"TEST_H_WIDTH = %d\n"
"TEST_V_HEIGHT = %d\n"
"TEST_REFRESH_DENOMINATOR = %d\n"
"TEST_REFRESH_NUMERATOR = %d\n",
link->dp_link.test_video.test_video_pattern,
link->dp_link.test_video.test_dyn_range,
link->dp_link.test_video.test_bit_depth,
link->dp_link.test_video.test_h_total,
link->dp_link.test_video.test_v_total,
link->dp_link.test_video.test_h_start,
link->dp_link.test_video.test_v_start,
link->dp_link.test_video.test_hsync_pol,
link->dp_link.test_video.test_hsync_width,
link->dp_link.test_video.test_vsync_pol,
link->dp_link.test_video.test_vsync_width,
link->dp_link.test_video.test_h_width,
link->dp_link.test_video.test_v_height,
link->dp_link.test_video.test_rr_d,
link->dp_link.test_video.test_rr_n);
return ret;
}
/**
* dp_link_parse_link_training_params() - parses link training parameters from
* DPCD
* @link: Display Port Driver data
*
* Returns 0 if it successfully parses the link rate (Byte 0x219) and lane
* count (Byte 0x220), and if these values parse are valid.
*/
static int dp_link_parse_link_training_params(struct dp_link_private *link)
{
u8 bp;
ssize_t rlen;
rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_LINK_RATE, &bp);
if (rlen < 0) {
DRM_ERROR("failed to read link rate. rlen=%zd\n", rlen);
return rlen;
}
if (!is_link_rate_valid(bp)) {
DRM_ERROR("invalid link rate = 0x%x\n", bp);
return -EINVAL;
}
link->request.test_link_rate = bp;
drm_dbg_dp(link->drm_dev, "link rate = 0x%x\n",
link->request.test_link_rate);
rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_LANE_COUNT, &bp);
if (rlen < 0) {
DRM_ERROR("failed to read lane count. rlen=%zd\n", rlen);
return rlen;
}
bp &= DP_MAX_LANE_COUNT_MASK;
if (!is_lane_count_valid(bp)) {
DRM_ERROR("invalid lane count = 0x%x\n", bp);
return -EINVAL;
}
link->request.test_lane_count = bp;
drm_dbg_dp(link->drm_dev, "lane count = 0x%x\n",
link->request.test_lane_count);
return 0;
}
/**
* dp_link_parse_phy_test_params() - parses the phy link parameters
* @link: Display Port Driver data
*
* Parses the DPCD (Byte 0x248) for the DP PHY link pattern that is being
* requested.
*/
static int dp_link_parse_phy_test_params(struct dp_link_private *link)
{
u8 data;
ssize_t rlen;
rlen = drm_dp_dpcd_readb(link->aux, DP_PHY_TEST_PATTERN,
&data);
if (rlen < 0) {
DRM_ERROR("failed to read phy link pattern. rlen=%zd\n", rlen);
return rlen;
}
link->dp_link.phy_params.phy_test_pattern_sel = data & 0x07;
drm_dbg_dp(link->drm_dev, "phy_test_pattern_sel = 0x%x\n", data);
switch (data) {
case DP_PHY_TEST_PATTERN_SEL_MASK:
case DP_PHY_TEST_PATTERN_NONE:
case DP_PHY_TEST_PATTERN_D10_2:
case DP_PHY_TEST_PATTERN_ERROR_COUNT:
case DP_PHY_TEST_PATTERN_PRBS7:
case DP_PHY_TEST_PATTERN_80BIT_CUSTOM:
case DP_PHY_TEST_PATTERN_CP2520:
return 0;
default:
return -EINVAL;
}
}
/**
* dp_link_is_video_audio_test_requested() - checks for audio/video link request
* @link: link requested by the sink
*
* Returns true if the requested link is a permitted audio/video link.
*/
static bool dp_link_is_video_audio_test_requested(u32 link)
{
u8 video_audio_test = (DP_TEST_LINK_VIDEO_PATTERN |
DP_TEST_LINK_AUDIO_PATTERN |
DP_TEST_LINK_AUDIO_DISABLED_VIDEO);
return ((link & video_audio_test) &&
!(link & ~video_audio_test));
}
/**
* dp_link_parse_request() - parses link request parameters from sink
* @link: Display Port Driver data
*
* Parses the DPCD to check if an automated link is requested (Byte 0x201),
* and what type of link automation is being requested (Byte 0x218).
*/
static int dp_link_parse_request(struct dp_link_private *link)
{
int ret = 0;
u8 data;
ssize_t rlen;
/**
* Read the device service IRQ vector (Byte 0x201) to determine
* whether an automated link has been requested by the sink.
*/
rlen = drm_dp_dpcd_readb(link->aux,
DP_DEVICE_SERVICE_IRQ_VECTOR, &data);
if (rlen < 0) {
DRM_ERROR("aux read failed. rlen=%zd\n", rlen);
return rlen;
}
drm_dbg_dp(link->drm_dev, "device service irq vector = 0x%x\n", data);
if (!(data & DP_AUTOMATED_TEST_REQUEST)) {
drm_dbg_dp(link->drm_dev, "no test requested\n");
return 0;
}
/**
* Read the link request byte (Byte 0x218) to determine what type
* of automated link has been requested by the sink.
*/
rlen = drm_dp_dpcd_readb(link->aux, DP_TEST_REQUEST, &data);
if (rlen < 0) {
DRM_ERROR("aux read failed. rlen=%zd\n", rlen);
return rlen;
}
if (!data || (data == DP_TEST_LINK_FAUX_PATTERN)) {
drm_dbg_dp(link->drm_dev, "link 0x%x not supported\n", data);
goto end;
}
drm_dbg_dp(link->drm_dev, "Test:(0x%x) requested\n", data);
link->request.test_requested = data;
if (link->request.test_requested == DP_TEST_LINK_PHY_TEST_PATTERN) {
ret = dp_link_parse_phy_test_params(link);
if (ret)
goto end;
ret = dp_link_parse_link_training_params(link);
if (ret)
goto end;
}
if (link->request.test_requested == DP_TEST_LINK_TRAINING) {
ret = dp_link_parse_link_training_params(link);
if (ret)
goto end;
}
if (dp_link_is_video_audio_test_requested(
link->request.test_requested)) {
ret = dp_link_parse_video_pattern_params(link);
if (ret)
goto end;
ret = dp_link_parse_audio_pattern_params(link);
}
end:
/*
* Send a DP_TEST_ACK if all link parameters are valid, otherwise send
* a DP_TEST_NAK.
*/
if (ret) {
link->dp_link.test_response = DP_TEST_NAK;
} else {
if (link->request.test_requested != DP_TEST_LINK_EDID_READ)
link->dp_link.test_response = DP_TEST_ACK;
else
link->dp_link.test_response =
DP_TEST_EDID_CHECKSUM_WRITE;
}
return ret;
}
static int dp_link_parse_sink_status_field(struct dp_link_private *link)
{
int len;
link->prev_sink_count = link->dp_link.sink_count;
len = drm_dp_read_sink_count(link->aux);
if (len < 0) {
DRM_ERROR("DP parse sink count failed\n");
return len;
}
link->dp_link.sink_count = len;
len = drm_dp_dpcd_read_link_status(link->aux,
link->link_status);
if (len < DP_LINK_STATUS_SIZE) {
DRM_ERROR("DP link status read failed\n");
return len;
}
return dp_link_parse_request(link);
}
/**
* dp_link_process_link_training_request() - processes new training requests
* @link: Display Port link data
*
* This function will handle new link training requests that are initiated by
* the sink. In particular, it will update the requested lane count and link
* rate, and then trigger the link retraining procedure.
*
* The function will return 0 if a link training request has been processed,
* otherwise it will return -EINVAL.
*/
static int dp_link_process_link_training_request(struct dp_link_private *link)
{
if (link->request.test_requested != DP_TEST_LINK_TRAINING)
return -EINVAL;
drm_dbg_dp(link->drm_dev,
"Test:0x%x link rate = 0x%x, lane count = 0x%x\n",
DP_TEST_LINK_TRAINING,
link->request.test_link_rate,
link->request.test_lane_count);
link->dp_link.link_params.num_lanes = link->request.test_lane_count;
link->dp_link.link_params.rate =
drm_dp_bw_code_to_link_rate(link->request.test_link_rate);
return 0;
}
bool dp_link_send_test_response(struct dp_link *dp_link)
{
struct dp_link_private *link = NULL;
int ret = 0;
if (!dp_link) {
DRM_ERROR("invalid input\n");
return false;
}
link = container_of(dp_link, struct dp_link_private, dp_link);
ret = drm_dp_dpcd_writeb(link->aux, DP_TEST_RESPONSE,
dp_link->test_response);
return ret == 1;
}
int dp_link_psm_config(struct dp_link *dp_link,
struct dp_link_info *link_info, bool enable)
{
struct dp_link_private *link = NULL;
int ret = 0;
if (!dp_link) {
DRM_ERROR("invalid params\n");
return -EINVAL;
}
link = container_of(dp_link, struct dp_link_private, dp_link);
mutex_lock(&link->psm_mutex);
if (enable)
ret = dp_aux_link_power_down(link->aux, link_info);
else
ret = dp_aux_link_power_up(link->aux, link_info);
if (ret)
DRM_ERROR("Failed to %s low power mode\n", enable ?
"enter" : "exit");
mutex_unlock(&link->psm_mutex);
return ret;
}
bool dp_link_send_edid_checksum(struct dp_link *dp_link, u8 checksum)
{
struct dp_link_private *link = NULL;
int ret = 0;
if (!dp_link) {
DRM_ERROR("invalid input\n");
return false;
}
link = container_of(dp_link, struct dp_link_private, dp_link);
ret = drm_dp_dpcd_writeb(link->aux, DP_TEST_EDID_CHECKSUM,
checksum);
return ret == 1;
}
static void dp_link_parse_vx_px(struct dp_link_private *link)
{
drm_dbg_dp(link->drm_dev, "vx: 0=%d, 1=%d, 2=%d, 3=%d\n",
drm_dp_get_adjust_request_voltage(link->link_status, 0),
drm_dp_get_adjust_request_voltage(link->link_status, 1),
drm_dp_get_adjust_request_voltage(link->link_status, 2),
drm_dp_get_adjust_request_voltage(link->link_status, 3));
drm_dbg_dp(link->drm_dev, "px: 0=%d, 1=%d, 2=%d, 3=%d\n",
drm_dp_get_adjust_request_pre_emphasis(link->link_status, 0),
drm_dp_get_adjust_request_pre_emphasis(link->link_status, 1),
drm_dp_get_adjust_request_pre_emphasis(link->link_status, 2),
drm_dp_get_adjust_request_pre_emphasis(link->link_status, 3));
/**
* Update the voltage and pre-emphasis levels as per DPCD request
* vector.
*/
drm_dbg_dp(link->drm_dev,
"Current: v_level = 0x%x, p_level = 0x%x\n",
link->dp_link.phy_params.v_level,
link->dp_link.phy_params.p_level);
link->dp_link.phy_params.v_level =
drm_dp_get_adjust_request_voltage(link->link_status, 0);
link->dp_link.phy_params.p_level =
drm_dp_get_adjust_request_pre_emphasis(link->link_status, 0);
link->dp_link.phy_params.p_level >>= DP_TRAIN_PRE_EMPHASIS_SHIFT;
drm_dbg_dp(link->drm_dev,
"Requested: v_level = 0x%x, p_level = 0x%x\n",
link->dp_link.phy_params.v_level,
link->dp_link.phy_params.p_level);
}
/**
* dp_link_process_phy_test_pattern_request() - process new phy link requests
* @link: Display Port Driver data
*
* This function will handle new phy link pattern requests that are initiated
* by the sink. The function will return 0 if a phy link pattern has been
* processed, otherwise it will return -EINVAL.
*/
static int dp_link_process_phy_test_pattern_request(
struct dp_link_private *link)
{
if (!(link->request.test_requested & DP_TEST_LINK_PHY_TEST_PATTERN)) {
drm_dbg_dp(link->drm_dev, "no phy test\n");
return -EINVAL;
}
if (!is_link_rate_valid(link->request.test_link_rate) ||
!is_lane_count_valid(link->request.test_lane_count)) {
DRM_ERROR("Invalid: link rate = 0x%x,lane count = 0x%x\n",
link->request.test_link_rate,
link->request.test_lane_count);
return -EINVAL;
}
drm_dbg_dp(link->drm_dev,
"Current: rate = 0x%x, lane count = 0x%x\n",
link->dp_link.link_params.rate,
link->dp_link.link_params.num_lanes);
drm_dbg_dp(link->drm_dev,
"Requested: rate = 0x%x, lane count = 0x%x\n",
link->request.test_link_rate,
link->request.test_lane_count);
link->dp_link.link_params.num_lanes = link->request.test_lane_count;
link->dp_link.link_params.rate =
drm_dp_bw_code_to_link_rate(link->request.test_link_rate);
dp_link_parse_vx_px(link);
return 0;
}
static bool dp_link_read_psr_error_status(struct dp_link_private *link)
{
u8 status;
drm_dp_dpcd_read(link->aux, DP_PSR_ERROR_STATUS, &status, 1);
if (status & DP_PSR_LINK_CRC_ERROR)
DRM_ERROR("PSR LINK CRC ERROR\n");
else if (status & DP_PSR_RFB_STORAGE_ERROR)
DRM_ERROR("PSR RFB STORAGE ERROR\n");
else if (status & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
DRM_ERROR("PSR VSC SDP UNCORRECTABLE ERROR\n");
else
return false;
return true;
}
static bool dp_link_psr_capability_changed(struct dp_link_private *link)
{
u8 status;
drm_dp_dpcd_read(link->aux, DP_PSR_ESI, &status, 1);
if (status & DP_PSR_CAPS_CHANGE) {
drm_dbg_dp(link->drm_dev, "PSR Capability Change\n");
return true;
}
return false;
}
static u8 get_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
{
return link_status[r - DP_LANE0_1_STATUS];
}
/**
* dp_link_process_link_status_update() - processes link status updates
* @link: Display Port link module data
*
* This function will check for changes in the link status, e.g. clock
* recovery done on all lanes, and trigger link training if there is a
* failure/error on the link.
*
* The function will return 0 if the a link status update has been processed,
* otherwise it will return -EINVAL.
*/
static int dp_link_process_link_status_update(struct dp_link_private *link)
{
bool channel_eq_done = drm_dp_channel_eq_ok(link->link_status,
link->dp_link.link_params.num_lanes);
bool clock_recovery_done = drm_dp_clock_recovery_ok(link->link_status,
link->dp_link.link_params.num_lanes);
drm_dbg_dp(link->drm_dev,
"channel_eq_done = %d, clock_recovery_done = %d\n",
channel_eq_done, clock_recovery_done);
if (channel_eq_done && clock_recovery_done)
return -EINVAL;
return 0;
}
/**
* dp_link_process_ds_port_status_change() - process port status changes
* @link: Display Port Driver data
*
* This function will handle downstream port updates that are initiated by
* the sink. If the downstream port status has changed, the EDID is read via
* AUX.
*
* The function will return 0 if a downstream port update has been
* processed, otherwise it will return -EINVAL.
*/
static int dp_link_process_ds_port_status_change(struct dp_link_private *link)
{
if (get_link_status(link->link_status, DP_LANE_ALIGN_STATUS_UPDATED) &
DP_DOWNSTREAM_PORT_STATUS_CHANGED)
goto reset;
if (link->prev_sink_count == link->dp_link.sink_count)
return -EINVAL;
reset:
/* reset prev_sink_count */
link->prev_sink_count = link->dp_link.sink_count;
return 0;
}
static bool dp_link_is_video_pattern_requested(struct dp_link_private *link)
{
return (link->request.test_requested & DP_TEST_LINK_VIDEO_PATTERN)
&& !(link->request.test_requested &
DP_TEST_LINK_AUDIO_DISABLED_VIDEO);
}
static bool dp_link_is_audio_pattern_requested(struct dp_link_private *link)
{
return (link->request.test_requested & DP_TEST_LINK_AUDIO_PATTERN);
}
static void dp_link_reset_data(struct dp_link_private *link)
{
link->request = (const struct dp_link_request){ 0 };
link->dp_link.test_video = (const struct dp_link_test_video){ 0 };
link->dp_link.test_video.test_bit_depth = DP_TEST_BIT_DEPTH_UNKNOWN;
link->dp_link.test_audio = (const struct dp_link_test_audio){ 0 };
link->dp_link.phy_params.phy_test_pattern_sel = 0;
link->dp_link.sink_request = 0;
link->dp_link.test_response = 0;
}
/**
* dp_link_process_request() - handle HPD IRQ transition to HIGH
* @dp_link: pointer to link module data
*
* This function will handle the HPD IRQ state transitions from LOW to HIGH
* (including cases when there are back to back HPD IRQ HIGH) indicating
* the start of a new link training request or sink status update.
*/
int dp_link_process_request(struct dp_link *dp_link)
{
int ret = 0;
struct dp_link_private *link;
if (!dp_link) {
DRM_ERROR("invalid input\n");
return -EINVAL;
}
link = container_of(dp_link, struct dp_link_private, dp_link);
dp_link_reset_data(link);
ret = dp_link_parse_sink_status_field(link);
if (ret)
return ret;
if (link->request.test_requested == DP_TEST_LINK_EDID_READ) {
dp_link->sink_request |= DP_TEST_LINK_EDID_READ;
} else if (!dp_link_process_ds_port_status_change(link)) {
dp_link->sink_request |= DS_PORT_STATUS_CHANGED;
} else if (!dp_link_process_link_training_request(link)) {
dp_link->sink_request |= DP_TEST_LINK_TRAINING;
} else if (!dp_link_process_phy_test_pattern_request(link)) {
dp_link->sink_request |= DP_TEST_LINK_PHY_TEST_PATTERN;
} else if (dp_link_read_psr_error_status(link)) {
DRM_ERROR("PSR IRQ_HPD received\n");
} else if (dp_link_psr_capability_changed(link)) {
drm_dbg_dp(link->drm_dev, "PSR Capability changed\n");
} else {
ret = dp_link_process_link_status_update(link);
if (!ret) {
dp_link->sink_request |= DP_LINK_STATUS_UPDATED;
} else {
if (dp_link_is_video_pattern_requested(link)) {
ret = 0;
dp_link->sink_request |= DP_TEST_LINK_VIDEO_PATTERN;
}
if (dp_link_is_audio_pattern_requested(link)) {
dp_link->sink_request |= DP_TEST_LINK_AUDIO_PATTERN;
ret = -EINVAL;
}
}
}
drm_dbg_dp(link->drm_dev, "sink request=%#x\n",
dp_link->sink_request);
return ret;
}
int dp_link_get_colorimetry_config(struct dp_link *dp_link)
{
u32 cc = DP_MISC0_COLORIMERY_CFG_LEGACY_RGB;
struct dp_link_private *link;
if (!dp_link) {
DRM_ERROR("invalid input\n");
return -EINVAL;
}
link = container_of(dp_link, struct dp_link_private, dp_link);
/*
* Unless a video pattern CTS test is ongoing, use RGB_VESA
* Only RGB_VESA and RGB_CEA supported for now
*/
if (dp_link_is_video_pattern_requested(link)) {
if (link->dp_link.test_video.test_dyn_range &
DP_TEST_DYNAMIC_RANGE_CEA)
cc = DP_MISC0_COLORIMERY_CFG_CEA_RGB;
}
return cc;
}
int dp_link_adjust_levels(struct dp_link *dp_link, u8 *link_status)
{
int i;
u8 max_p_level;
int v_max = 0, p_max = 0;
struct dp_link_private *link;
if (!dp_link) {
DRM_ERROR("invalid input\n");
return -EINVAL;
}
link = container_of(dp_link, struct dp_link_private, dp_link);
/* use the max level across lanes */
for (i = 0; i < dp_link->link_params.num_lanes; i++) {
u8 data_v = drm_dp_get_adjust_request_voltage(link_status, i);
u8 data_p = drm_dp_get_adjust_request_pre_emphasis(link_status,
i);
drm_dbg_dp(link->drm_dev,
"lane=%d req_vol_swing=%d req_pre_emphasis=%d\n",
i, data_v, data_p);
if (v_max < data_v)
v_max = data_v;
if (p_max < data_p)
p_max = data_p;
}
dp_link->phy_params.v_level = v_max >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
dp_link->phy_params.p_level = p_max >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
/**
* Adjust the voltage swing and pre-emphasis level combination to within
* the allowable range.
*/
if (dp_link->phy_params.v_level > DP_TRAIN_LEVEL_MAX) {
drm_dbg_dp(link->drm_dev,
"Requested vSwingLevel=%d, change to %d\n",
dp_link->phy_params.v_level,
DP_TRAIN_LEVEL_MAX);
dp_link->phy_params.v_level = DP_TRAIN_LEVEL_MAX;
}
if (dp_link->phy_params.p_level > DP_TRAIN_LEVEL_MAX) {
drm_dbg_dp(link->drm_dev,
"Requested preEmphasisLevel=%d, change to %d\n",
dp_link->phy_params.p_level,
DP_TRAIN_LEVEL_MAX);
dp_link->phy_params.p_level = DP_TRAIN_LEVEL_MAX;
}
max_p_level = DP_TRAIN_LEVEL_MAX - dp_link->phy_params.v_level;
if (dp_link->phy_params.p_level > max_p_level) {
drm_dbg_dp(link->drm_dev,
"Requested preEmphasisLevel=%d, change to %d\n",
dp_link->phy_params.p_level,
max_p_level);
dp_link->phy_params.p_level = max_p_level;
}
drm_dbg_dp(link->drm_dev, "adjusted: v_level=%d, p_level=%d\n",
dp_link->phy_params.v_level, dp_link->phy_params.p_level);
return 0;
}
void dp_link_reset_phy_params_vx_px(struct dp_link *dp_link)
{
dp_link->phy_params.v_level = 0;
dp_link->phy_params.p_level = 0;
}
u32 dp_link_get_test_bits_depth(struct dp_link *dp_link, u32 bpp)
{
u32 tbd;
struct dp_link_private *link;
link = container_of(dp_link, struct dp_link_private, dp_link);
/*
* Few simplistic rules and assumptions made here:
* 1. Test bit depth is bit depth per color component
* 2. Assume 3 color components
*/
switch (bpp) {
case 18:
tbd = DP_TEST_BIT_DEPTH_6;
break;
case 24:
tbd = DP_TEST_BIT_DEPTH_8;
break;
case 30:
tbd = DP_TEST_BIT_DEPTH_10;
break;
default:
drm_dbg_dp(link->drm_dev, "bpp=%d not supported, use bpc=8\n",
bpp);
tbd = DP_TEST_BIT_DEPTH_8;
break;
}
tbd = (tbd >> DP_TEST_BIT_DEPTH_SHIFT);
return tbd;
}
struct dp_link *dp_link_get(struct device *dev, struct drm_dp_aux *aux)
{
struct dp_link_private *link;
struct dp_link *dp_link;
if (!dev || !aux) {
DRM_ERROR("invalid input\n");
return ERR_PTR(-EINVAL);
}
link = devm_kzalloc(dev, sizeof(*link), GFP_KERNEL);
if (!link)
return ERR_PTR(-ENOMEM);
link->aux = aux;
mutex_init(&link->psm_mutex);
dp_link = &link->dp_link;
return dp_link;
}
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