Re: [PATCH 3/5] drm/i915: Use fb format modifiers in skylake_update_primary_plane

[Damien Lespiau <damien.lespiau@intel.com>]

On Mon, Feb 09, 2015 at 07:03:26PM +0100, Daniel Vetter wrote:
> Just a little demo really. We probably need to introduce skl specific
> functions for a lot of the format validation stuff, or at least
> helpers. Specifically I think intel_framebuffer_init and
> intel_fb_align_height must be adjusted to have an i915_ and a skl_
> variant. And only shared code should be converted to fb modifiers,
> platform code (like the plane config readout can keep on using old
> tiling_mode defines to avoid some churn).
> 
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 2d69cce03ab5..41b3ddc4068d 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2773,11 +2773,11 @@ static void skylake_update_primary_plane(struct drm_crtc *crtc,
>  	 * The stride is either expressed as a multiple of 64 bytes chunks for
>  	 * linear buffers or in number of tiles for tiled buffers.
>  	 */
> -	switch (obj->tiling_mode) {
> -	case I915_TILING_NONE:
> +	switch (fb->modifier[0]) {
> +	case DRM_FORMAT_MOD_NONE:
>  		stride = fb->pitches[0] >> 6;
>  		break;
> -	case I915_TILING_X:
> +	case I915_FORMAT_MOD_X_TILED:
>  		plane_ctl |= PLANE_CTL_TILED_X;
>  		stride = fb->pitches[0] >> 9;
>  		break;

Just a remark across the board is that this code won't work as we add
new types of modifiers besides tiling. Might as wels reserve tiling bits
today and select on them.

-- 
Damien
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