On Thu, Sep 11, 2025 at 05:32:40PM +0800, Yongbang Shi wrote:
On Thu, Aug 14, 2025 at 08:19:41PM +0800, Yongbang Shi wrote:
On Wed, Aug 13, 2025 at 05:42:29PM +0800, Yongbang Shi wrote:
From: Baihan Li <libai...@huawei.com>
The debouncing when HPD pulled out still remains sometimes, 200ms still can
not ensure helper_detect() is correct. So add a flag to hold the sink
status, and changed detect_ctx() functions by using flag to check status.
THis doesn't explain what is wrong with
drm_connector_helper_detect_from_ddc(). In the end, this function
doesn't use the HPD pin.
I'm sorry about the misunderstanding.
The issue is that after plugging or unplugging the monitor, the driver takes no
action sometimes
even though an interrupt is triggered. The root cause is that
drm_connector_helper_detect_from_ddc()
still returns connected status when the monitor is unplugged.
And I will fix the way in the end.
Can you perform a normal DP detection: read DPCD and check that there is
a DPRX attached and that it's either non-branch device or it has one or
more sinks?
I'm very sorry that I didn't get the last sentence's asking before.
It's a non-branch device. We just connect a DP monitor.
Somebody might connect a different configuration than the one that you
are using.
Okay, I can add the check drm_dp_is_branch() in the DP's detect_ctx() to
intercept branch devices, is that good?
Thanks,
Baihan Li
