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drm/bridge: synopsys: dw-hdmi: check hdmi status in resume

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HDMI status maybe incorrect in the following condition:
HDMI plug in -> system sleep ->  HDMI plug out -> system wake up.
At this time, cat /sys/class/drm/card 0-HDMI-A-1/status is connected.
There is no hpd interrupt, because HDMI is powerdown during suspend.
So we need check the current HDMI status in this case.
Test on rk3288 & rk3399.

Change-Id: I2fbafd1d80b59628bca65e9e45760a24d1668241
Signed-off-by: Nickey Yang <nickey.yang@rock-chips.com>
This commit is contained in:
Nickey Yang
2019-08-24 17:45:53 +08:00
committed by Shunqing Chen
parent b8c2578c5a
commit 881ef729dd
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
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@@ -4155,6 +4155,21 @@ void dw_hdmi_resume(struct device *dev, struct dw_hdmi *hdmi)
dw_hdmi_i2c_init(hdmi);
if (hdmi->irq)
enable_irq(hdmi->irq);
/*
* HDMI status maybe incorrect in the following condition:
* HDMI plug in -> system sleep -> HDMI plug out -> system wake up.
* At this time, cat /sys/class/drm/card 0-HDMI-A-1/status is connected.
* There is no hpd interrupt, because HDMI is powerdown during suspend.
* So we need check the current HDMI status in this case.
*/
if (hdmi->connector.status == connector_status_connected) {
if (hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data) ==
connector_status_disconnected) {
hdmi->hpd_state = false;
mod_delayed_work(hdmi->workqueue, &hdmi->work,
msecs_to_jiffies(20));
}
}
mutex_unlock(&hdmi->mutex);
}
EXPORT_SYMBOL_GPL(dw_hdmi_resume);