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drm/hisilicon/hibmc: add updating link cap in DP detect()

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In the past, the link cap is updated in link training at encoder enable
stage, but the hibmc_dp_mode_valid() is called before it, which will use
DP link's rate and lanes. So add the hibmc_dp_update_caps() in
hibmc_dp_update_caps() to avoid some potential risks.

Fixes: 607805abfb ("drm/hisilicon/hibmc: add dp mode valid check")
Signed-off-by: Lin He <helin52@huawei.com>
Signed-off-by: Yongbang Shi <shiyongbang@huawei.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260509032302.2057227-2-shiyongbang@huawei.com
This commit is contained in:
Lin He 2026-05-09 11:22:59 +08:00 committed by Thomas Zimmermann
parent 6101f78b68
commit 7d380ef98d
3 changed files with 4 additions and 1 deletions
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1
drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h
View File

@ -69,5 +69,6 @@ int hibmc_dp_link_training(struct hibmc_dp_dev *dp);
int hibmc_dp_serdes_init(struct hibmc_dp_dev *dp);
int hibmc_dp_serdes_rate_switch(u8 rate, struct hibmc_dp_dev *dp);
int hibmc_dp_serdes_set_tx_cfg(struct hibmc_dp_dev *dp, u8 train_set[HIBMC_DP_LANE_NUM_MAX]);
void hibmc_dp_update_caps(struct hibmc_dp_dev *dp);
#endif

2
drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.c
View File

@ -325,7 +325,7 @@ static int hibmc_dp_link_downgrade_training_eq(struct hibmc_dp_dev *dp)
return hibmc_dp_link_reduce_rate(dp);
}
static void hibmc_dp_update_caps(struct hibmc_dp_dev *dp)
void hibmc_dp_update_caps(struct hibmc_dp_dev *dp)
{
dp->link.cap.link_rate = dp->dpcd[DP_MAX_LINK_RATE];
if (dp->link.cap.link_rate > DP_LINK_BW_8_1 || !dp->link.cap.link_rate)

2
drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c
View File

@ -41,6 +41,8 @@ static bool hibmc_dp_get_dpcd(struct hibmc_dp_dev *dp_dev)
if (ret)
return false;
hibmc_dp_update_caps(dp_dev);
dp_dev->is_branch = drm_dp_is_branch(dp_dev->dpcd);
ret = drm_dp_read_desc(dp_dev->aux, &dp_dev->desc, dp_dev->is_branch);