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drm/rockchip: cdn_dp: Fix link retrain condition

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Validate the cached values of link parameters before
attempting to retrain.

Change-Id: Idf4f8a7c2d85109e05dc7e387f46ddeb55cd0a01
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
This commit is contained in:
Wyon Bi
2021-06-30 11:44:02 +08:00
parent d7b5c81015
commit 403ae7fd2a
1 changed files with 19 additions and 1 deletions
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20
drivers/gpu/drm/rockchip/cdn-dp-core.c
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@@ -1061,6 +1061,24 @@ out:
return ret;
}
static bool cdn_dp_needs_link_retrain(struct cdn_dp_device *dp)
{
u8 link_status[DP_LINK_STATUS_SIZE];
/*
* Validate the cached values of link parameters before attempting to
* retrain.
*/
if (!dp->link.rate || !dp->link.num_lanes)
return false;
if (drm_dp_dpcd_read_link_status(&dp->aux, link_status) < 0)
return false;
/* Retrain if Channel EQ or CR not ok */
return !drm_dp_channel_eq_ok(link_status, dp->link.num_lanes);
}
static void cdn_dp_pd_event_work(struct work_struct *work)
{
struct cdn_dp_device *dp = container_of(work, struct cdn_dp_device,
@@ -1101,7 +1119,7 @@ static void cdn_dp_pd_event_work(struct work_struct *work)
dp->connected = false;
/* Enabled and connected with a sink, re-train if requested */
} else if (!cdn_dp_check_link_status(dp)) {
} else if (cdn_dp_needs_link_retrain(dp)) {
unsigned int rate = dp->link.rate;
unsigned int lanes = dp->link.num_lanes;
struct drm_display_mode *mode = &dp->mode;