linux-kernel - Re: [PATCH v2 drm-dp 08/10] drm/hisilicon/hibmc: fix no showing when no connectors connected

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Message-ID: <d3d23wf72e66e2lyj3jqsmajuskx5zbqok33o2sx3wrd3nipje@wavrn6adtbtx>
Date: Sat, 28 Jun 2025 20:08:16 +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 v2 drm-dp 08/10] drm/hisilicon/hibmc: fix no showing when
 no connectors connected

On Fri, Jun 20, 2025 at 05:31:02PM +0800, Yongbang Shi wrote:
> From: Baihan Li <libaihan@...wei.com>
> 
> Our chip support KVM over IP feature, so hibmc driver need to support
> displaying without any connectors plugged in. Deleting the detect_ctx()
> of VGA to make it connected when no connector is detected.

I think, there is more than that. Please see how AST driver handles the
same issue. I think you need something similar.

> 
> Fixes: 4c962bc929f1 ("drm/hisilicon/hibmc: Add vga connector detect functions")
> Signed-off-by: Baihan Li <libaihan@...wei.com>
> Signed-off-by: Yongbang Shi <shiyongbang@...wei.com>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> index 841e81f47b68..953474d04b5c 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> @@ -60,7 +60,6 @@ static void hibmc_connector_destroy(struct drm_connector *connector)
>  static const struct drm_connector_helper_funcs
>  	hibmc_connector_helper_funcs = {
>  	.get_modes = hibmc_connector_get_modes,
> -	.detect_ctx = drm_connector_helper_detect_from_ddc,
>  };
>  
>  static const struct drm_connector_funcs hibmc_connector_funcs = {
> -- 
> 2.33.0
> 

-- 
With best wishes
Dmitry