[Intel-gfx] [PATCH 08/12] drm/i915: Allow calling intel_adjust_tile_offset() multiple times

[Ville Syrjälä]

On Tue, May 03, 2016 at 06:39:57PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Minimize the resulting X coordinate after intel_adjust_tile_offset() is
> done with it's offset adjustment. This allows calling
> intel_adjust_tile_offset() multiple times in case we need to adjust
> the offset several times.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

I was hoping to push most of this, but this patch still needs to be
reviewed before I do that. I don't want to push without the SKL
X-tile hack (which needs this).

Sivakumar, are you still looking at this or should I turn elsewhere?

> ---
>  drivers/gpu/drm/i915/intel_display.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 438f3bd86e48..17f9f014e808 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2361,6 +2361,7 @@ static u32 intel_adjust_tile_offset(int *x, int *y,
>  				    u32 old_offset,
>  				    u32 new_offset)
>  {
> +	unsigned int pitch_pixels = pitch_tiles * tile_width;
>  	unsigned int tiles;
>  
>  	WARN_ON(old_offset & (tile_size - 1));
> @@ -2372,6 +2373,10 @@ static u32 intel_adjust_tile_offset(int *x, int *y,
>  	*y += tiles / pitch_tiles * tile_height;
>  	*x += tiles % pitch_tiles * tile_width;
>  
> +	/* minimize x in case it got needlessly big */
> +	*y += *x / pitch_pixels * tile_height;
> +	*x %= pitch_pixels;
> +
>  	return new_offset;
>  }
>  
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel OTC