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

[Ville Syrjälä]

On Tue, Nov 29, 2022 at 02:43:02PM +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
> fb doesn't have it. This is causing problems when PSR is enabled.
> 
> Implement simple fb_dirty callback to deliver notifications to psr
> about updates in fb console.

Just found this regression myself after being baffled why the
vt console was inoperable right after the driver gets loaded.

It's also not just psr, but also fbc that is having issues.

Needs a fixes + cc:stable tags.

> 
> 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 | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
> index 5575d7abdc09..7c7fba3fe69e 100644
> --- a/drivers/gpu/drm/i915/display/intel_fbdev.c
> +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
> @@ -328,8 +328,17 @@ 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)
> +{

The original thing had some kind of "is this rect actually visible?"
check here. Does anyone know why it was there, and if so maybe it should
go back to the higher level function so everyone doens't need to add it
back in?

> +	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