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

[Thomas Zimmermann]

Hi

Am 29.11.22 um 13:43 schrieb Jouni Högander:
> 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.

I'm a bit confused about i915's use of fb_dirty here. How is this 
supposed to interact with mmap?  i915 doesn't use deferred I/O so fbdev 
mmap will never call fb_dirty if userspace writes to mmap'ed pages. Is 
this only required for the kernel's graphics console?

Best regards
Thomas

> 
> 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)
> +{
> +	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)

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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