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: <qv3frn7zaqzxatag5y7g3p6u5ulywife5aqovhjppjokglptwg@vl4ponlnbbtv>
Date: Sun, 8 Jun 2025 15:44:37 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Yongbang Shi <shiyongbang@...wei.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
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.

> 
> 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(-)

-- 
With best wishes
Dmitry