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dp_link.c
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dp_link.c
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// 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_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 device *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;
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_D0;
err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
if (err < 0)
return err;
usleep_range(1000, 2000);
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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("lane count = 0x%x\n", link->request.test_lane_count);
return 0;
}
/**
* dp_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_DEBUG_DP("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_DEBUG_DP("device service irq vector = 0x%x\n", data);
if (!(data & DP_AUTOMATED_TEST_REQUEST)) {
DRM_DEBUG_DP("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_DEBUG_DP("link 0x%x not supported\n", data);
goto end;
}
DRM_DEBUG_DP("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;
}
/**
* dp_link_parse_sink_count() - parses the sink count
* @dp_link: pointer to link module data
*
* Parses the DPCD to check if there is an update to the sink count
* (Byte 0x200), and whether all the sink devices connected have Content
* Protection enabled.
*/
static int dp_link_parse_sink_count(struct dp_link *dp_link)
{
ssize_t rlen;
bool cp_ready;
struct dp_link_private *link = container_of(dp_link,
struct dp_link_private, dp_link);
rlen = drm_dp_dpcd_readb(link->aux, DP_SINK_COUNT,
&link->dp_link.sink_count);
if (rlen < 0) {
DRM_ERROR("sink count read failed. rlen=%zd\n", rlen);
return rlen;
}
cp_ready = link->dp_link.sink_count & DP_SINK_CP_READY;
link->dp_link.sink_count =
DP_GET_SINK_COUNT(link->dp_link.sink_count);
DRM_DEBUG_DP("sink_count = 0x%x, cp_ready = 0x%x\n",
link->dp_link.sink_count, cp_ready);
return 0;
}
static void dp_link_parse_sink_status_field(struct dp_link_private *link)
{
int len = 0;
link->prev_sink_count = link->dp_link.sink_count;
dp_link_parse_sink_count(&link->dp_link);
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");
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_DEBUG_DP("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 = 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");
else
dp_link->psm_enabled = enable;
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 int dp_link_parse_vx_px(struct dp_link_private *link)
{
int ret = 0;
DRM_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("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_DEBUG_DP("Requested: v_level = 0x%x, p_level = 0x%x\n",
link->dp_link.phy_params.v_level,
link->dp_link.phy_params.p_level);
return ret;
}
/**
* 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)
{
int ret = 0;
if (!(link->request.test_requested & DP_TEST_LINK_PHY_TEST_PATTERN)) {
DRM_DEBUG_DP("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_DEBUG_DP("Current: rate = 0x%x, lane count = 0x%x\n",
link->dp_link.link_params.rate,
link->dp_link.link_params.num_lanes);
DRM_DEBUG_DP("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);
ret = dp_link_parse_vx_px(link);
if (ret)
DRM_ERROR("parse_vx_px failed. ret=%d\n", ret);
return ret;
}
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)
{
if (!(get_link_status(link->link_status,
DP_LANE_ALIGN_STATUS_UPDATED) &
DP_LINK_STATUS_UPDATED) ||
(drm_dp_clock_recovery_ok(link->link_status,
link->dp_link.link_params.num_lanes) &&
drm_dp_channel_eq_ok(link->link_status,
link->dp_link.link_params.num_lanes)))
return -EINVAL;
DRM_DEBUG_DP("channel_eq_done = %d, clock_recovery_done = %d\n",
drm_dp_clock_recovery_ok(link->link_status,
link->dp_link.link_params.num_lanes),
drm_dp_clock_recovery_ok(link->link_status,
link->dp_link.link_params.num_lanes));
return 0;
}
/**
* dp_link_process_downstream_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);