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drm/bridge: analogix_dp: Check link status in loader_protect()

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Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
Change-Id: I8816a0527eb7a1c1d3a2d7b7480057b888e375e0
This commit is contained in:
Wyon Bi
2022-09-30 01:18:21 +00:00
committed by Tao Huang
parent 379474682f
commit beaac7714a
1 changed files with 13 additions and 0 deletions
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13
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
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@@ -2099,6 +2099,7 @@ static void analogix_dp_link_train_restore(struct analogix_dp_device *dp)
int analogix_dp_loader_protect(struct analogix_dp_device *dp)
{
u8 link_status[DP_LINK_STATUS_SIZE];
int ret;
ret = analogix_dp_phy_power_on(dp);
@@ -2119,6 +2120,18 @@ int analogix_dp_loader_protect(struct analogix_dp_device *dp)
goto err_disable;
}
ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
if (ret < 0) {
dev_err(dp->dev, "Failed to read link status\n");
goto err_disable;
}
if (!drm_dp_channel_eq_ok(link_status, dp->link_train.lane_count)) {
dev_err(dp->dev, "Channel EQ or CR not ok\n");
ret = -EINVAL;
goto err_disable;
}
return 0;
err_disable: