[Intel-gfx] [PATCH v2] drm/i915/skl: Consider plane rotation when calculating stride in skl_do_mmio_flip

[Ville Syrjälä]

On Tue, Oct 20, 2015 at 03:54:11PM +0100, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Previously rotation was ignored and wrong stride programmed
> into the plane registers resulting in a corrupt image on screen.
> 
> v2: Do not access potentialy old plane state at flip time,
>     but store the rotation value at the time of queing the flip.
>     (Ville)
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Testcase: igt/kms_rotation_crc/primary-rotation-90-flip-stress (SKL)
> Cc: Sonika Jindal <sonika.jindal at intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 30 +++++++++++++++++++-----------
>  drivers/gpu/drm/i915/intel_drv.h     |  1 +
>  2 files changed, 20 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 1fc1d240d3c1..9cb29086971a 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11091,13 +11091,14 @@ static bool use_mmio_flip(struct intel_engine_cs *ring,
>  }
>  
>  static void skl_do_mmio_flip(struct intel_crtc *intel_crtc,
> +			     unsigned int rotation,
>  			     struct intel_unpin_work *work)
>  {
>  	struct drm_device *dev = intel_crtc->base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct drm_framebuffer *fb = intel_crtc->base.primary->fb;
>  	const enum pipe pipe = intel_crtc->pipe;
> -	u32 ctl, stride;
> +	u32 ctl, stride, tile_height;
>  
>  	ctl = I915_READ(PLANE_CTL(pipe, 0));
>  	ctl &= ~PLANE_CTL_TILED_MASK;
> @@ -11121,9 +11122,16 @@ static void skl_do_mmio_flip(struct intel_crtc *intel_crtc,
>  	 * The stride is either expressed as a multiple of 64 bytes chunks for
>  	 * linear buffers or in number of tiles for tiled buffers.
>  	 */
> -	stride = fb->pitches[0] /
> -		 intel_fb_stride_alignment(dev, fb->modifier[0],
> -					   fb->pixel_format);
> +	if (intel_rotation_90_or_270(rotation)) {
> +		/* stride = Surface height in tiles */
> +		tile_height = intel_tile_height(dev, fb->pixel_format,
> +						fb->modifier[0], 0);
> +		stride = DIV_ROUND_UP(fb->height, tile_height);
> +	} else {
> +		stride = fb->pitches[0] /
> +				intel_fb_stride_alignment(dev, fb->modifier[0],
> +							  fb->pixel_format);
> +	}
>  
>  	/*
>  	 * Both PLANE_CTL and PLANE_STRIDE are not updated on vblank but on
> @@ -11181,7 +11189,7 @@ static void intel_do_mmio_flip(struct intel_mmio_flip *mmio_flip)
>  	intel_pipe_update_start(crtc);
>  
>  	if (INTEL_INFO(mmio_flip->i915)->gen >= 9)
> -		skl_do_mmio_flip(crtc, work);
> +		skl_do_mmio_flip(crtc, mmio_flip->rotation, work);
>  	else
>  		/* use_mmio_flip() retricts MMIO flips to ilk+ */
>  		ilk_do_mmio_flip(crtc, work);
> @@ -11208,10 +11216,8 @@ static void intel_mmio_flip_work_func(struct work_struct *work)
>  
>  static int intel_queue_mmio_flip(struct drm_device *dev,
>  				 struct drm_crtc *crtc,
> -				 struct drm_framebuffer *fb,
> -				 struct drm_i915_gem_object *obj,
> -				 struct intel_engine_cs *ring,
> -				 uint32_t flags)
> +				 unsigned int rotation,
> +				 struct drm_i915_gem_object *obj)
>  {
>  	struct intel_mmio_flip *mmio_flip;
>  
> @@ -11222,6 +11228,7 @@ static int intel_queue_mmio_flip(struct drm_device *dev,
>  	mmio_flip->i915 = to_i915(dev);
>  	mmio_flip->req = i915_gem_request_reference(obj->last_write_req);
>  	mmio_flip->crtc = to_intel_crtc(crtc);
> +	mmio_flip->rotation = rotation;

Could just do the crtc->primary->state->rotation thing here and avoid
having to pass the rotation from the caller.

But the patch looks OK anyway:
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

>  
>  	INIT_WORK(&mmio_flip->work, intel_mmio_flip_work_func);
>  	schedule_work(&mmio_flip->work);
> @@ -11438,8 +11445,9 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>  	work->gtt_offset += intel_crtc->dspaddr_offset;
>  
>  	if (mmio_flip) {
> -		ret = intel_queue_mmio_flip(dev, crtc, fb, obj, ring,
> -					    page_flip_flags);
> +		ret = intel_queue_mmio_flip(dev, crtc,
> +					    crtc->primary->state->rotation,
> +					    obj);
>  		if (ret)
>  			goto cleanup_unpin;
>  
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 27dccf35f9bc..140f949302c7 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -493,6 +493,7 @@ struct intel_mmio_flip {
>  	struct drm_i915_private *i915;
>  	struct drm_i915_gem_request *req;
>  	struct intel_crtc *crtc;
> +	unsigned int rotation;
>  };
>  
>  struct skl_pipe_wm {
> -- 
> 1.9.1

-- 
Ville Syrjälä
Intel OTC