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path: root/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
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Diffstat (limited to 'drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c')
-rw-r--r--drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c94
1 files changed, 72 insertions, 22 deletions
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
index f6355c16cc0a..74f7832ea53e 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
@@ -9,6 +9,22 @@
#define HIBMC_EQ_MAX_RETRY 5
+static inline int hibmc_dp_get_serdes_rate_cfg(struct hibmc_dp_dev *dp)
+{
+ switch (dp->link.cap.link_rate) {
+ case DP_LINK_BW_1_62:
+ return DP_SERDES_BW_1_62;
+ case DP_LINK_BW_2_7:
+ return DP_SERDES_BW_2_7;
+ case DP_LINK_BW_5_4:
+ return DP_SERDES_BW_5_4;
+ case DP_LINK_BW_8_1:
+ return DP_SERDES_BW_8_1;
+ default:
+ return -EINVAL;
+ }
+}
+
static int hibmc_dp_link_training_configure(struct hibmc_dp_dev *dp)
{
u8 buf[2];
@@ -26,7 +42,7 @@ static int hibmc_dp_link_training_configure(struct hibmc_dp_dev *dp)
/* set rate and lane count */
buf[0] = dp->link.cap.link_rate;
buf[1] = DP_LANE_COUNT_ENHANCED_FRAME_EN | dp->link.cap.lanes;
- ret = drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, buf, sizeof(buf));
+ ret = drm_dp_dpcd_write(dp->aux, DP_LINK_BW_SET, buf, sizeof(buf));
if (ret != sizeof(buf)) {
drm_dbg_dp(dp->dev, "dp aux write link rate and lanes failed, ret: %d\n", ret);
return ret >= 0 ? -EIO : ret;
@@ -35,17 +51,13 @@ static int hibmc_dp_link_training_configure(struct hibmc_dp_dev *dp)
/* set 8b/10b and downspread */
buf[0] = DP_SPREAD_AMP_0_5;
buf[1] = DP_SET_ANSI_8B10B;
- ret = drm_dp_dpcd_write(&dp->aux, DP_DOWNSPREAD_CTRL, buf, sizeof(buf));
+ ret = drm_dp_dpcd_write(dp->aux, DP_DOWNSPREAD_CTRL, buf, sizeof(buf));
if (ret != sizeof(buf)) {
drm_dbg_dp(dp->dev, "dp aux write 8b/10b and downspread failed, ret: %d\n", ret);
return ret >= 0 ? -EIO : ret;
}
- ret = drm_dp_read_dpcd_caps(&dp->aux, dp->dpcd);
- if (ret)
- drm_err(dp->dev, "dp aux read dpcd failed, ret: %d\n", ret);
-
- return ret;
+ return 0;
}
static int hibmc_dp_link_set_pattern(struct hibmc_dp_dev *dp, int pattern)
@@ -84,7 +96,7 @@ static int hibmc_dp_link_set_pattern(struct hibmc_dp_dev *dp, int pattern)
hibmc_dp_reg_write_field(dp, HIBMC_DP_PHYIF_CTRL0, HIBMC_DP_CFG_PAT_SEL, val);
- ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_PATTERN_SET, &buf, sizeof(buf));
+ ret = drm_dp_dpcd_write(dp->aux, DP_TRAINING_PATTERN_SET, &buf, sizeof(buf));
if (ret != sizeof(buf)) {
drm_dbg_dp(dp->dev, "dp aux write training pattern set failed\n");
return ret >= 0 ? -EIO : ret;
@@ -108,9 +120,13 @@ static int hibmc_dp_link_training_cr_pre(struct hibmc_dp_dev *dp)
return ret;
for (i = 0; i < dp->link.cap.lanes; i++)
- train_set[i] = DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
+ train_set[i] = DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
+
+ ret = hibmc_dp_serdes_set_tx_cfg(dp, dp->link.train_set);
+ if (ret)
+ return ret;
- ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, train_set, dp->link.cap.lanes);
+ ret = drm_dp_dpcd_write(dp->aux, DP_TRAINING_LANE0_SET, train_set, dp->link.cap.lanes);
if (ret != dp->link.cap.lanes) {
drm_dbg_dp(dp->dev, "dp aux write training lane set failed\n");
return ret >= 0 ? -EIO : ret;
@@ -137,21 +153,29 @@ static bool hibmc_dp_link_get_adjust_train(struct hibmc_dp_dev *dp,
return false;
}
-static inline int hibmc_dp_link_reduce_rate(struct hibmc_dp_dev *dp)
+static int hibmc_dp_link_reduce_rate(struct hibmc_dp_dev *dp)
{
+ int ret;
+
switch (dp->link.cap.link_rate) {
case DP_LINK_BW_2_7:
dp->link.cap.link_rate = DP_LINK_BW_1_62;
- return 0;
+ break;
case DP_LINK_BW_5_4:
dp->link.cap.link_rate = DP_LINK_BW_2_7;
- return 0;
+ break;
case DP_LINK_BW_8_1:
dp->link.cap.link_rate = DP_LINK_BW_5_4;
- return 0;
+ break;
default:
return -EINVAL;
}
+
+ ret = hibmc_dp_get_serdes_rate_cfg(dp);
+ if (ret < 0)
+ return ret;
+
+ return hibmc_dp_serdes_rate_switch(ret, dp);
}
static inline int hibmc_dp_link_reduce_lane(struct hibmc_dp_dev *dp)
@@ -159,6 +183,7 @@ static inline int hibmc_dp_link_reduce_lane(struct hibmc_dp_dev *dp)
switch (dp->link.cap.lanes) {
case 0x2:
dp->link.cap.lanes--;
+ drm_dbg_dp(dp->dev, "dp link training reduce to 1 lane\n");
break;
case 0x1:
drm_err(dp->dev, "dp link training reduce lane failed, already reach minimum\n");
@@ -185,10 +210,10 @@ static int hibmc_dp_link_training_cr(struct hibmc_dp_dev *dp)
voltage_tries = 1;
for (cr_tries = 0; cr_tries < 80; cr_tries++) {
- drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd);
+ drm_dp_link_train_clock_recovery_delay(dp->aux, dp->dpcd);
- ret = drm_dp_dpcd_read_link_status(&dp->aux, lane_status);
- if (ret != DP_LINK_STATUS_SIZE) {
+ ret = drm_dp_dpcd_read_link_status(dp->aux, lane_status);
+ if (ret) {
drm_err(dp->dev, "Get lane status failed\n");
return ret;
}
@@ -206,7 +231,12 @@ static int hibmc_dp_link_training_cr(struct hibmc_dp_dev *dp)
}
level_changed = hibmc_dp_link_get_adjust_train(dp, lane_status);
- ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->link.train_set,
+
+ ret = hibmc_dp_serdes_set_tx_cfg(dp, dp->link.train_set);
+ if (ret)
+ return ret;
+
+ ret = drm_dp_dpcd_write(dp->aux, DP_TRAINING_LANE0_SET, dp->link.train_set,
dp->link.cap.lanes);
if (ret != dp->link.cap.lanes) {
drm_dbg_dp(dp->dev, "Update link training failed\n");
@@ -233,10 +263,10 @@ static int hibmc_dp_link_training_channel_eq(struct hibmc_dp_dev *dp)
return ret;
for (eq_tries = 0; eq_tries < HIBMC_EQ_MAX_RETRY; eq_tries++) {
- drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd);
+ drm_dp_link_train_channel_eq_delay(dp->aux, dp->dpcd);
- ret = drm_dp_dpcd_read_link_status(&dp->aux, lane_status);
- if (ret != DP_LINK_STATUS_SIZE) {
+ ret = drm_dp_dpcd_read_link_status(dp->aux, lane_status);
+ if (ret) {
drm_err(dp->dev, "get lane status failed\n");
break;
}
@@ -255,7 +285,12 @@ static int hibmc_dp_link_training_channel_eq(struct hibmc_dp_dev *dp)
}
hibmc_dp_link_get_adjust_train(dp, lane_status);
- ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
+
+ ret = hibmc_dp_serdes_set_tx_cfg(dp, dp->link.train_set);
+ if (ret)
+ return ret;
+
+ ret = drm_dp_dpcd_write(dp->aux, DP_TRAINING_LANE0_SET,
dp->link.train_set, dp->link.cap.lanes);
if (ret != dp->link.cap.lanes) {
drm_dbg_dp(dp->dev, "Update link training failed\n");
@@ -295,6 +330,21 @@ int hibmc_dp_link_training(struct hibmc_dp_dev *dp)
struct hibmc_dp_link *link = &dp->link;
int ret;
+ ret = drm_dp_read_dpcd_caps(dp->aux, dp->dpcd);
+ if (ret)
+ drm_err(dp->dev, "dp aux read dpcd failed, ret: %d\n", ret);
+
+ dp->link.cap.link_rate = dp->dpcd[DP_MAX_LINK_RATE];
+ dp->link.cap.lanes = 0x2;
+
+ ret = hibmc_dp_get_serdes_rate_cfg(dp);
+ if (ret < 0)
+ return ret;
+
+ ret = hibmc_dp_serdes_rate_switch(ret, dp);
+ if (ret)
+ return ret;
+
while (true) {
ret = hibmc_dp_link_training_cr_pre(dp);
if (ret)
generated by cgit (git 2.34.1) at 2025-07-25 20:30:55 +0000