[Intel-gfx] [PATCH v3] drm/i915/fbdev: Implement fb_dirty for intel custom fb helper

[Ville Syrjälä]

On Wed, Dec 21, 2022 at 05:38:16PM +0200, Jouni Högander wrote:
> After splitting generic drm_fb_helper into it's own file it's left to
> helper implementation to have fb_dirty function. Currently intel
> fbdev doesn't have it. This is causing problems to features (PSR, FBC,
> DRRS) relying on dirty callback.
> 
> Implement simple fb_dirty callback to deliver notifications about updates
> in fb console.
> 
> v3: Check damage clip
> v2: Improved commit message and added Fixes tag
> 
> Fixes: 8ab59da26bc0 ("drm/fb-helper: Move generic fbdev emulation into separate source file")

That doesn't look like a funcitonal change to me.
Was it really that commit that broke things?

> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: Thomas Zimmermann <tzimmermann at suse.de>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_fbdev.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 03ed4607a46d..4e87d9964fcc 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -328,8 +328,20 @@ static int intelfb_create(struct drm_fb_helper *helper,
>  	return ret;
>  }
>  
> +static int intelfb_dirty(struct drm_fb_helper *helper, struct drm_clip_rect *clip)
> +{
> +	if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
> +		return 0;
> +
> +	if (helper->fb->funcs->dirty)
> +		return helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
> +
> +	return 0;
> +}
> +
>  static const struct drm_fb_helper_funcs intel_fb_helper_funcs = {
>  	.fb_probe = intelfb_create,
> +	.fb_dirty = intelfb_dirty,
>  };
>  
>  static void intel_fbdev_destroy(struct intel_fbdev *ifbdev)
> -- 
> 2.34.1

-- 
Ville Syrjälä
Intel