linux-kernel - Re: [PATCH v1] drm/virtio: Fix handling CONFIG_DRM_VIRTIO_GPU

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Date:   Mon, 6 Mar 2023 08:32:30 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>
Cc:     Rob Clark <robdclark@...il.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>,
        Ryan Neph <ryanneph@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Javier Martinez Canillas <javierm@...hat.com>,
        David Airlie <airlied@...hat.com>, kernel@...labora.com,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v1] drm/virtio: Fix handling CONFIG_DRM_VIRTIO_GPU_KMS
 option

> +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
> @@ -45,9 +45,11 @@ static void virtio_gpu_config_changed_work_func(struct work_struct *work)
>  	if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
>  		if (vgdev->has_edid)
>  			virtio_gpu_cmd_get_edids(vgdev);
> -		virtio_gpu_cmd_get_display_info(vgdev);
> -		virtio_gpu_notify(vgdev);
> -		drm_helper_hpd_irq_event(vgdev->ddev);
> +		if (vgdev->num_scanouts) {
> +			virtio_gpu_cmd_get_display_info(vgdev);
> +			virtio_gpu_notify(vgdev);
> +			drm_helper_hpd_irq_event(vgdev->ddev);
> +		}

I'd suggest to make the edid lines conditional too.

> -	if (IS_ENABLED(CONFIG_DRM_VIRTIO_GPU_KMS) || !vgdev->num_scanouts) {
> +	if (!IS_ENABLED(CONFIG_DRM_VIRTIO_GPU_KMS) || !vgdev->num_scanouts) {
>  		DRM_INFO("KMS disabled\n");
>  		vgdev->num_scanouts = 0;
>  		vgdev->has_edid = false;

Doesn't make a difference because has_edid gets set to false here,
but IMHO it is less confusing that way.

take care,
  Gerd