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drm/bridge: analogix_dp: Check dpcd write/read status

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We need to check the dpcd write/read return value to see whether the
write/read was successful

Cc: Kristian H. Kristensen <hoegsberg@chromium.org>
Signed-off-by: Lin Huang <hl@rock-chips.com>
Signed-off-by: zain wang <wzz@rock-chips.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423105003.9004-11-enric.balletbo@collabora.com
This commit is contained in:
Lin Huang 2018-04-23 12:49:46 +02:00 committed by Andrzej Hajda
parent 1932250df1
commit ccdc578b69
1 changed files with 127 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

169
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
View File

@ -160,80 +160,137 @@ int analogix_dp_disable_psr(struct analogix_dp_device *dp)
}
EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp)
static int analogix_dp_detect_sink_psr(struct analogix_dp_device *dp)
{
unsigned char psr_version;
int ret;
ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version);
if (ret != 1) {
dev_err(dp->dev, "failed to get PSR version, disable it\n");
return ret;
}
drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version);
dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version);
return (psr_version & DP_PSR_IS_SUPPORTED) ? true : false;
dp->psr_enable = (psr_version & DP_PSR_IS_SUPPORTED) ? true : false;
return 0;
}
static void analogix_dp_enable_sink_psr(struct analogix_dp_device *dp)
static int analogix_dp_enable_sink_psr(struct analogix_dp_device *dp)
{
unsigned char psr_en;
int ret;
/* Disable psr function */
drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en);
ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en);
if (ret != 1) {
dev_err(dp->dev, "failed to get psr config\n");
goto end;
}
psr_en &= ~DP_PSR_ENABLE;
drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
if (ret != 1) {
dev_err(dp->dev, "failed to disable panel psr\n");
goto end;
}
/* Main-Link transmitter remains active during PSR active states */
psr_en = DP_PSR_MAIN_LINK_ACTIVE | DP_PSR_CRC_VERIFICATION;
drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
if (ret != 1) {
dev_err(dp->dev, "failed to set panel psr\n");
goto end;
}
/* Enable psr function */
psr_en = DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE |
DP_PSR_CRC_VERIFICATION;
drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
if (ret != 1) {
dev_err(dp->dev, "failed to set panel psr\n");
goto end;
}
analogix_dp_enable_psr_crc(dp);
return 0;
end:
dev_err(dp->dev, "enable psr fail, force to disable psr\n");
dp->psr_enable = false;
return ret;
}
static void
static int
analogix_dp_enable_rx_to_enhanced_mode(struct analogix_dp_device *dp,
bool enable)
{
u8 data;
int ret;
drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data);
ret = drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data);
if (ret != 1)
return ret;
if (enable)
drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
DP_LANE_COUNT_ENHANCED_FRAME_EN |
DPCD_LANE_COUNT_SET(data));
ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
DP_LANE_COUNT_ENHANCED_FRAME_EN |
DPCD_LANE_COUNT_SET(data));
else
drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
DPCD_LANE_COUNT_SET(data));
ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
DPCD_LANE_COUNT_SET(data));
return ret < 0 ? ret : 0;
}
static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp)
static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp,
u8 *enhanced_mode_support)
{
u8 data;
int retval;
int ret;
drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
retval = DPCD_ENHANCED_FRAME_CAP(data);
ret = drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
if (ret != 1) {
*enhanced_mode_support = 0;
return ret;
}
return retval;
*enhanced_mode_support = DPCD_ENHANCED_FRAME_CAP(data);
return 0;
}
static void analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp)
static int analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp)
{
u8 data;
int ret;
ret = analogix_dp_is_enhanced_mode_available(dp, &data);
if (ret < 0)
return ret;
ret = analogix_dp_enable_rx_to_enhanced_mode(dp, data);
if (ret < 0)
return ret;
data = analogix_dp_is_enhanced_mode_available(dp);
analogix_dp_enable_rx_to_enhanced_mode(dp, data);
analogix_dp_enable_enhanced_mode(dp, data);
return 0;
}
static void analogix_dp_training_pattern_dis(struct analogix_dp_device *dp)
static int analogix_dp_training_pattern_dis(struct analogix_dp_device *dp)
{
int ret;
analogix_dp_set_training_pattern(dp, DP_NONE);
drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_DISABLE);
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
DP_TRAINING_PATTERN_DISABLE);
return ret < 0 ? ret : 0;
}
static void
@ -282,7 +339,11 @@ static int analogix_dp_link_start(struct analogix_dp_device *dp)
if (retval < 0)
return retval;
/* set enhanced mode if available */
analogix_dp_set_enhanced_mode(dp);
retval = analogix_dp_set_enhanced_mode(dp);
if (retval < 0) {
dev_err(dp->dev, "failed to set enhance mode\n");
return retval;
}
/* Set TX pre-emphasis to minimum */
for (lane = 0; lane < lane_count; lane++)
@ -567,10 +628,11 @@ static int analogix_dp_process_equalizer_training(struct analogix_dp_device *dp)
if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) {
/* traing pattern Set to Normal */
analogix_dp_training_pattern_dis(dp);
retval = analogix_dp_training_pattern_dis(dp);
if (retval < 0)
return retval;
dev_info(dp->dev, "Link Training success!\n");
analogix_dp_get_link_bandwidth(dp, &reg);
dp->link_train.link_rate = reg;
dev_dbg(dp->dev, "final bandwidth = %.2x\n",
@ -867,24 +929,32 @@ static int analogix_dp_config_video(struct analogix_dp_device *dp)
return 0;
}
static void analogix_dp_enable_scramble(struct analogix_dp_device *dp,
bool enable)
static int analogix_dp_enable_scramble(struct analogix_dp_device *dp,
bool enable)
{
u8 data;
int ret;
if (enable) {
analogix_dp_enable_scrambling(dp);
drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data);
drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET,
&data);
if (ret != 1)
return ret;
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
(u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
} else {
analogix_dp_disable_scrambling(dp);
drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET, &data);
drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET,
&data);
if (ret != 1)
return ret;
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
(u8)(data | DP_LINK_SCRAMBLING_DISABLE));
}
return ret < 0 ? ret : 0;
}
static irqreturn_t analogix_dp_hardirq(int irq, void *arg)
@ -939,23 +1009,36 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
return ret;
}
analogix_dp_enable_scramble(dp, 1);
ret = analogix_dp_enable_scramble(dp, 1);
if (ret < 0) {
dev_err(dp->dev, "can not enable scramble\n");
return ret;
}
analogix_dp_init_video(dp);
ret = analogix_dp_config_video(dp);
if (ret)
if (ret) {
dev_err(dp->dev, "unable to config video\n");
return ret;
}
/* Safe to enable the panel now */
if (dp->plat_data->panel) {
if (drm_panel_enable(dp->plat_data->panel))
ret = drm_panel_enable(dp->plat_data->panel);
if (ret) {
DRM_ERROR("failed to enable the panel\n");
return ret;
}
}
dp->psr_enable = analogix_dp_detect_sink_psr(dp);
ret = analogix_dp_detect_sink_psr(dp);
if (ret)
return ret;
if (dp->psr_enable)
analogix_dp_enable_sink_psr(dp);
return 0;
ret = analogix_dp_enable_sink_psr(dp);
return ret;
}
/*
@ -1185,8 +1268,10 @@ static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
}
ret = analogix_dp_commit(dp);
if (ret)
if (ret) {
DRM_ERROR("dp commit error, ret = %d\n", ret);
goto out_dp_init;
}
enable_irq(dp->irq);
return 0;