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video: rockchip: dp: fix dp connected issue which caused by hpd signal.

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some device will triggered hpd after dp is connected, so we don't do
traning if dp lanes is not changed.

Change-Id: I3e329e7d2db33138f283ad6584b966ebd0619f65
Signed-off-by: wenping.zhang <wenping.zhang@rock-chips.com>
This commit is contained in:
wenping.zhang
2016-12-26 10:04:14 +08:00
committed by Huang, Tao
parent e40c0e2bb5
commit 2bd4ff7162
1 changed files with 15 additions and 12 deletions
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27
drivers/video/rockchip/dp/rockchip_dp_core.c
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@@ -745,21 +745,24 @@ static void cdn_dp_pd_event_wq(struct work_struct *work)
* attached, that means something on the Type-C Dock/Dongle
* changed, check the sink count by DPCD. If sink count became
* 0, this port phy can be powered off; if the sink count does
* not change, it means the sink device status has update,
* re-training to make it work again.
* not change and dp is connected, don't do anything, because
* dp video output maybe ongoing. if dp is not connected, that
* means something is wrong, we don't do anything here, just
* output error log.
*/
ret = cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &sink_count, 1);
if (ret || sink_count) {
if (dp->dpms_mode == DRM_MODE_DPMS_ON) {
dev_warn(dp->dev,
"hpd interrupt is triggered when dp is already connected successfully\n");
ret = cdn_dp_training_start(dp);
if (!ret)
cdn_dp_get_training_status(dp);
}
cdn_dp_dpcd_read(dp, DP_SINK_COUNT, &sink_count, 1);
if (sink_count) {
if (dp->hpd_status == connector_status_connected)
dev_info(dp->dev,
"hpd interrupt is triggered when dp has been already connected\n");
else
dev_err(dp->dev,
"something is wrong, hpd is triggered before dp is connected\n");
goto out;
} else {
new_cap_lanes = 0;
}
new_cap_lanes = 0;
}
if (dp->hpd_status == connector_status_connected && new_cap_lanes) {