[v2,2/8] drm/fbdev-generic: Remove unused prefer_shadow_fbdev flag

[Sui jingfeng]

Well, this patch looks good to me.

Tested-by: Sui Jingfeng <suijingfeng at loongson.cn>

On 2023/3/20 23:07, Thomas Zimmermann wrote:
> Remove the flag prefer_shadow_fbdev from struct drm_mode_config.
> Drivers set this flag to enable shadow buffering in the generic
> fbdev emulation. Such shadow buffering is now mandatory, so the
> flag is unused.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> Reviewed-by: Javier Martinez Canillas <javierm at redhat.com>
> Reviewed-by: Zack Rusin <zackr at vmware.com>
> ---
>   drivers/gpu/drm/tiny/bochs.c        | 1 -
>   drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 1 -
>   include/drm/drm_mode_config.h       | 7 -------
>   3 files changed, 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
> index 024346054c70..d254679a136e 100644
> --- a/drivers/gpu/drm/tiny/bochs.c
> +++ b/drivers/gpu/drm/tiny/bochs.c
> @@ -545,7 +545,6 @@ static int bochs_kms_init(struct bochs_device *bochs)
>   
>   	bochs->dev->mode_config.preferred_depth = 24;
>   	bochs->dev->mode_config.prefer_shadow = 0;
> -	bochs->dev->mode_config.prefer_shadow_fbdev = 1;
>   	bochs->dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
>   
>   	bochs->dev->mode_config.funcs = &bochs_mode_funcs;
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> index 84d6380b9895..5162a7a12792 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
> @@ -2112,7 +2112,6 @@ int vmw_kms_init(struct vmw_private *dev_priv)
>   	dev->mode_config.max_width = dev_priv->texture_max_width;
>   	dev->mode_config.max_height = dev_priv->texture_max_height;
>   	dev->mode_config.preferred_depth = dev_priv->assume_16bpp ? 16 : 32;
> -	dev->mode_config.prefer_shadow_fbdev = !dev_priv->has_mob;
>   
>   	drm_mode_create_suggested_offset_properties(dev);
>   	vmw_kms_create_hotplug_mode_update_property(dev_priv);
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index e5b053001d22..973119a9176b 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -890,13 +890,6 @@ struct drm_mode_config {
>   	/* dumb ioctl parameters */
>   	uint32_t preferred_depth, prefer_shadow;
>   
> -	/**
> -	 * @prefer_shadow_fbdev:
> -	 *
> -	 * Hint to framebuffer emulation to prefer shadow-fb rendering.
> -	 */
> -	bool prefer_shadow_fbdev;
> -
>   	/**
>   	 * @quirk_addfb_prefer_xbgr_30bpp:
>   	 *