linux-kernel - Re: [PATCH drm-dp 08/10] drm/hisilicon/hibmc: fix DP no showing after HPD with VGA connected

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Message-ID: <fe70844f-ce96-43a1-a7ba-a99c785ad753@huawei.com>
Date: Tue, 10 Jun 2025 22:03:33 +0800
From: Yongbang Shi <shiyongbang@...wei.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
CC: <xinliang.liu@...aro.org>, <tiantao6@...ilicon.com>,
	<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
	<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
	<kong.kongxinwei@...ilicon.com>, <liangjian010@...wei.com>,
	<chenjianmin@...wei.com>, <lidongming5@...wei.com>, <libaihan@...wei.com>,
	<shenjian15@...wei.com>, <shaojijie@...wei.com>,
	<jani.nikula@...ux.intel.com>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <shiyongbang@...wei.com>
Subject: Re: [PATCH drm-dp 08/10] drm/hisilicon/hibmc: fix DP no showing after
 HPD with VGA connected


> On Fri, May 30, 2025 at 05:54:30PM +0800, Yongbang Shi wrote:
>> From: Baihan Li <libaihan@...wei.com>
>>
>> If the system started with VGA connected, the desktop like GDM cannot get
>> DP's CRTC when DP device is plugged in, because there is only one crtc
>> sharing use of VGA and DP. So change VGA to disconnected when DP is
>> connected.
> NAK. I think we discussed this when the previous patch was submitted.
>
> VGA and DP are independent. It should be user's choice whether to use
> VGA or DP if both are connected.

Acutally, although we are developing drm drivers, our requirements
and testing department's goal is to displaying desktop systems(like GDM), so we have to
solve different OS or display managers problems, and let the driver handle more situations.


>> Fixes: 4c962bc929f1 ("drm/hisilicon/hibmc: Add vga connector detect functions")
>> Signed-off-by: Baihan Li <libaihan@...wei.com>
>> ---
>>   drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 14 +++++++++++++-
>>   1 file changed, 13 insertions(+), 1 deletion(-)