[Intel-gfx] [PATCH] drm/i915/bxt: Fix wm calculation for pixel format change

[Daniel Vetter]

On Wed, Dec 23, 2015 at 10:52:36AM +0530, Nabendu Maiti wrote:
> Recalculate watermark when there is a change in pixel format.
> 
> Signed-off-by: Nabendu Maiti <nabendu.bikash.maiti at intel.com>

This seems like something that's been broken recently in the watermark
shuffling. Please dig out the patch which broke this (using git blame
works best usually) and add a Fixes: line per
Documentation/SubmittingPatches. Please then also add the patch author,
reviwers and anyone else Cc'ed on that patch to your patch here using Cc:
lines in the s-o-b section, and then please resend.

Also, do we have an igt testcase for this issue? If not, we should
definitely have one.
-Daniel

> ---
>  drivers/gpu/drm/i915/intel_display.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 2d0b006..4bd5080 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11819,6 +11819,7 @@ static bool intel_wm_need_update(struct drm_plane *plane,
>  		return false;
>  
>  	if (cur->base.fb->modifier[0] != new->base.fb->modifier[0] ||
> +	    cur->base.fb->pixel_format != new->base.fb->pixel_format ||
>  	    cur->base.rotation != new->base.rotation ||
>  	    drm_rect_width(&new->src) != drm_rect_width(&cur->src) ||
>  	    drm_rect_height(&new->src) != drm_rect_height(&cur->src) ||
> -- 
> 1.9.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch