Re: [PATCH 7/7] drm/i915: Add horizontal mirroring support for CHV pipe B planes

[Joonas Lahtinen <joonas.lahtinen@linux.intel.com>]

On ke, 2016-07-20 at 16:18 +0300, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> The primary and sprite planes on CHV pipe B support horizontal
> mirroring. Expose it to the world.
> 
> Sadly the hardware ignores the mirror bit when the rotate bit is
> set, so we'll have to reject the 180+X case.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Seems to match spec. Maybe add your own T-b, as you have obviously
tested on hardware.

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

Regards, Joonas

> ---
>  drivers/gpu/drm/i915/intel_atomic_plane.c |  8 ++++++++
>  drivers/gpu/drm/i915/intel_display.c      | 10 ++++++++++
>  drivers/gpu/drm/i915/intel_sprite.c       | 10 ++++++++++
>  3 files changed, 28 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_atomic_plane.c b/drivers/gpu/drm/i915/intel_atomic_plane.c
> index c19eb9a0cd4a..0a019eacfede 100644
> --- a/drivers/gpu/drm/i915/intel_atomic_plane.c
> +++ b/drivers/gpu/drm/i915/intel_atomic_plane.c
> @@ -180,6 +180,14 @@ static int intel_plane_atomic_check(struct drm_plane *plane,
>  		}
>  	}
>  
> +	/* CHV ignores the mirror bit when the rotate bit is set :( */
> +	if (IS_CHERRYVIEW(plane->dev) &&
> +	    state->rotation & BIT(DRM_ROTATE_180) &&
> +	    state->rotation & BIT(DRM_REFLECT_X)) {
> +		DRM_DEBUG_KMS("Cannot rotate and reflect at the same time\n");
> +		return -EINVAL;
> +	}
> +
>  	intel_state->visible = false;
>  	ret = intel_plane->check_plane(plane, crtc_state, intel_state);
>  	if (ret)
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 88a7c4173715..edb1809a642d 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -2677,6 +2677,9 @@ static void i9xx_update_primary_plane(struct drm_plane *primary,
>  	if (rotation & BIT(DRM_ROTATE_180))
>  		dspcntr |= DISPPLANE_ROTATE_180;
>  
> +	if (rotation & BIT(DRM_REFLECT_X))
> +		dspcntr |= DISPPLANE_MIRROR;
> +
>  	if (IS_G4X(dev))
>  		dspcntr |= DISPPLANE_TRICKLE_FEED_DISABLE;
>  
> @@ -2700,6 +2703,9 @@ static void i9xx_update_primary_plane(struct drm_plane *primary,
>  		linear_offset +=
>  			(crtc_state->pipe_src_h - 1) * fb->pitches[0] +
>  			(crtc_state->pipe_src_w - 1) * cpp;
> +	} else if (rotation & BIT(DRM_REFLECT_X)) {
> +		x += (crtc_state->pipe_src_w - 1);
> +		linear_offset += (crtc_state->pipe_src_w - 1) * cpp;
>  	}
>  
>  	intel_crtc->adjusted_x = x;
> @@ -14295,6 +14301,10 @@ static struct drm_plane *intel_primary_plane_create(struct drm_device *dev,
>  		supported_rotations =
>  			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_90) |
>  			BIT(DRM_ROTATE_180) | BIT(DRM_ROTATE_270);
> +	} else if (IS_CHERRYVIEW(dev) && pipe == PIPE_B) {
> +		supported_rotations =
> +			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180) |
> +			BIT(DRM_REFLECT_X);
>  	} else if (INTEL_INFO(dev)->gen >= 4) {
>  		supported_rotations =
>  			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180);
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index 14173f53f520..4d6cd1a02e34 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -436,6 +436,9 @@ vlv_update_plane(struct drm_plane *dplane,
>  	if (rotation & BIT(DRM_ROTATE_180))
>  		sprctl |= SP_ROTATE_180;
>  
> +	if (rotation & BIT(DRM_REFLECT_X))
> +		sprctl |= SP_MIRROR;
> +
>  	/* Sizes are 0 based */
>  	src_w--;
>  	src_h--;
> @@ -451,6 +454,9 @@ vlv_update_plane(struct drm_plane *dplane,
>  		x += src_w;
>  		y += src_h;
>  		linear_offset += src_h * fb->pitches[0] + src_w * cpp;
> +	} else if (rotation & BIT(DRM_REFLECT_X)) {
> +		x += src_w;
> +		linear_offset += src_w * cpp;
>  	}
>  
>  	if (key->flags) {
> @@ -1128,6 +1134,10 @@ intel_plane_init(struct drm_device *dev, enum pipe pipe, int plane)
>  		supported_rotations =
>  			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_90) |
>  			BIT(DRM_ROTATE_180) | BIT(DRM_ROTATE_270);
> +	} else if (IS_CHERRYVIEW(dev) && pipe == PIPE_B) {
> +		supported_rotations =
> +			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180) |
> +			BIT(DRM_REFLECT_X);
>  	} else {
>  		supported_rotations =
>  			BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_180);
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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