drm/i915: Add plane alpha blending support, v2.
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Message ID 20180815103405.22679-1-maarten.lankhorst@linux.intel.com
State New
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Series
  • drm/i915: Add plane alpha blending support, v2.
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Commit Message

Maarten Lankhorst Aug. 15, 2018, 10:34 a.m. UTC
Add plane alpha blending support with the different blend modes.
This has been tested on a icl to show the correct results,
on earlier platforms small rounding errors cause issues. But this
already happens case with fully transparant or fully opaque RGB8888
fb's.

The recommended HW workaround is to disable alpha blending when the
plane alpha is 0 (transparant, hide plane) or 0xff (opaque, disable blending).
This is easy to implement on any platform, so just do that.

The tests for userspace are also available, and pass on gen11.

Changes since v1:
- Change mistaken < 0xff0 to 0xff00.
- Only set PLANE_KEYMSK_ALPHA_ENABLE when plane alpha < 0xff00, ignore blend mode.
- Rework disabling FBC when per pixel alpha is used.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  2 +
 drivers/gpu/drm/i915/i915_reg.h      |  2 +
 drivers/gpu/drm/i915/intel_display.c | 58 +++++++++++++++++++---------
 drivers/gpu/drm/i915/intel_fbc.c     |  8 ++++
 drivers/gpu/drm/i915/intel_sprite.c  | 23 ++++++++++-
 5 files changed, 73 insertions(+), 20 deletions(-)

Comments

Matt Roper Aug. 22, 2018, 10:57 p.m. UTC | #1
On Wed, Aug 15, 2018 at 12:34:05PM +0200, Maarten Lankhorst wrote:
> Add plane alpha blending support with the different blend modes.
> This has been tested on a icl to show the correct results,
> on earlier platforms small rounding errors cause issues. But this
> already happens case with fully transparant or fully opaque RGB8888
> fb's.
> 
> The recommended HW workaround is to disable alpha blending when the
> plane alpha is 0 (transparant, hide plane) or 0xff (opaque, disable blending).
> This is easy to implement on any platform, so just do that.
> 
> The tests for userspace are also available, and pass on gen11.
> 
> Changes since v1:
> - Change mistaken < 0xff0 to 0xff00.
> - Only set PLANE_KEYMSK_ALPHA_ENABLE when plane alpha < 0xff00, ignore blend mode.
> - Rework disabling FBC when per pixel alpha is used.
> 
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

One question and one minor suggestion inline below, but otherwise,

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_drv.h      |  2 +
>  drivers/gpu/drm/i915/i915_reg.h      |  2 +
>  drivers/gpu/drm/i915/intel_display.c | 58 +++++++++++++++++++---------
>  drivers/gpu/drm/i915/intel_fbc.c     |  8 ++++
>  drivers/gpu/drm/i915/intel_sprite.c  | 23 ++++++++++-
>  5 files changed, 73 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 3fa56b960ef2..29f75da5fa8c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -545,6 +545,8 @@ struct intel_fbc {
>  			int adjusted_y;
>  
>  			int y;
> +
> +			uint16_t pixel_blend_mode;
>  		} plane;
>  
>  		struct {
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 0c9f03dda569..93a1d87cdeb2 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6561,8 +6561,10 @@ enum {
>  #define _PLANE_KEYVAL_2_A			0x70294
>  #define _PLANE_KEYMSK_1_A			0x70198
>  #define _PLANE_KEYMSK_2_A			0x70298
> +#define  PLANE_KEYMSK_ALPHA_ENABLE		(1 << 31)
>  #define _PLANE_KEYMAX_1_A			0x701a0
>  #define _PLANE_KEYMAX_2_A			0x702a0
> +#define  PLANE_KEYMAX_ALPHA_SHIFT		24
>  #define _PLANE_AUX_DIST_1_A			0x701c0
>  #define _PLANE_AUX_DIST_2_A			0x702c0
>  #define _PLANE_AUX_OFFSET_1_A			0x701c4
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a0345e7d3c2b..aedad3674b0d 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3167,6 +3167,12 @@ int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
>  		return -EINVAL;
>  	}
>  
> +	/* HW only has 8 bits pixel precision, disable plane if invisible */
> +	if (!(plane_state->base.alpha >> 8)) {
> +		plane_state->base.visible = false;
> +		return 0;
> +	}
> +
>  	if (!plane_state->base.visible)
>  		return 0;
>  
> @@ -3512,30 +3518,39 @@ static u32 skl_plane_ctl_format(uint32_t pixel_format)
>  	return 0;
>  }
>  
> -/*
> - * XXX: For ARBG/ABGR formats we default to expecting scanout buffers
> - * to be already pre-multiplied. We need to add a knob (or a different
> - * DRM_FORMAT) for user-space to configure that.
> - */
> -static u32 skl_plane_ctl_alpha(uint32_t pixel_format)
> +static u32 skl_plane_ctl_alpha(const struct intel_plane_state *plane_state)
>  {
> -	switch (pixel_format) {
> -	case DRM_FORMAT_ABGR8888:
> -	case DRM_FORMAT_ARGB8888:
> +	if (!plane_state->base.fb->format->has_alpha)
> +		return PLANE_CTL_ALPHA_DISABLE;
> +
> +	switch (plane_state->base.pixel_blend_mode) {
> +	case DRM_MODE_BLEND_PIXEL_NONE:
> +		return PLANE_CTL_ALPHA_DISABLE;
> +	case DRM_MODE_BLEND_PREMULTI:
>  		return PLANE_CTL_ALPHA_SW_PREMULTIPLY;
> +	case DRM_MODE_BLEND_COVERAGE:
> +		return PLANE_CTL_ALPHA_HW_PREMULTIPLY;
>  	default:
> -		return PLANE_CTL_ALPHA_DISABLE;
> +		MISSING_CASE(plane_state->base.pixel_blend_mode);
> +		return 0;

Maybe just add the MISSING_CASE line before the current return?  The
macro still expands to 0, so leaving that makes it slightly more clear
what the default fallback is.  Same for the glk_ function below.

>  	}
>  }
>  
> -static u32 glk_plane_color_ctl_alpha(uint32_t pixel_format)
> +static u32 glk_plane_color_ctl_alpha(const struct intel_plane_state *plane_state)
>  {
> -	switch (pixel_format) {
> -	case DRM_FORMAT_ABGR8888:
> -	case DRM_FORMAT_ARGB8888:
> +	if (!plane_state->base.fb->format->has_alpha)
> +		return PLANE_COLOR_ALPHA_DISABLE;
> +
> +	switch (plane_state->base.pixel_blend_mode) {
> +	case DRM_MODE_BLEND_PIXEL_NONE:
> +		return PLANE_COLOR_ALPHA_DISABLE;
> +	case DRM_MODE_BLEND_PREMULTI:
>  		return PLANE_COLOR_ALPHA_SW_PREMULTIPLY;
> +	case DRM_MODE_BLEND_COVERAGE:
> +		return PLANE_COLOR_ALPHA_HW_PREMULTIPLY;
>  	default:
> -		return PLANE_COLOR_ALPHA_DISABLE;
> +		MISSING_CASE(plane_state->base.pixel_blend_mode);
> +		return 0;
>  	}
>  }
>  
> @@ -3611,7 +3626,7 @@ u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
>  	plane_ctl = PLANE_CTL_ENABLE;
>  
>  	if (INTEL_GEN(dev_priv) < 10 && !IS_GEMINILAKE(dev_priv)) {
> -		plane_ctl |= skl_plane_ctl_alpha(fb->format->format);
> +		plane_ctl |= skl_plane_ctl_alpha(plane_state);
>  		plane_ctl |=
>  			PLANE_CTL_PIPE_GAMMA_ENABLE |
>  			PLANE_CTL_PIPE_CSC_ENABLE |
> @@ -3653,7 +3668,7 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
>  		plane_color_ctl |= PLANE_COLOR_PIPE_CSC_ENABLE;
>  	}
>  	plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
> -	plane_color_ctl |= glk_plane_color_ctl_alpha(fb->format->format);
> +	plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);
>  
>  	if (fb->format->is_yuv) {
>  		if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
> @@ -13792,7 +13807,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>  						   DRM_MODE_ROTATE_0,
>  						   supported_rotations);
>  
> -	if (INTEL_GEN(dev_priv) >= 9)
> +	if (INTEL_GEN(dev_priv) >= 9) {
>  		drm_plane_create_color_properties(&primary->base,
>  						  BIT(DRM_COLOR_YCBCR_BT601) |
>  						  BIT(DRM_COLOR_YCBCR_BT709),
> @@ -13801,6 +13816,13 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>  						  DRM_COLOR_YCBCR_BT709,
>  						  DRM_COLOR_YCBCR_LIMITED_RANGE);
>  
> +		drm_plane_create_alpha_property(&primary->base);
> +		drm_plane_create_blend_mode_property(&primary->base,
> +						     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
> +						     BIT(DRM_MODE_BLEND_PREMULTI) |
> +						     BIT(DRM_MODE_BLEND_COVERAGE));
> +	}
> +
>  	drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);
>  
>  	return primary;
> diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
> index 75a6bbf3ada1..42a49fe34ba3 100644
> --- a/drivers/gpu/drm/i915/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/intel_fbc.c
> @@ -674,6 +674,8 @@ static void intel_fbc_update_state_cache(struct intel_crtc *crtc,
>  	cache->plane.adjusted_y = plane_state->main.y;
>  	cache->plane.y = plane_state->base.src.y1 >> 16;
>  
> +	cache->plane.pixel_blend_mode = plane_state->base.pixel_blend_mode;
> +
>  	if (!cache->plane.visible)
>  		return;
>  
> @@ -748,6 +750,12 @@ static bool intel_fbc_can_activate(struct intel_crtc *crtc)
>  		return false;
>  	}
>  
> +	if (cache->plane.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
> +	    cache->fb.format->has_alpha) {
> +		fbc->no_fbc_reason = "per-pixel alpha blending is incompatible with FBC";
> +		return false;
> +	}

This sounds reasonable, but is there somewhere in the b-spec that
explains this explicitly?  The FBC_CTL description lists pixel format
restrictions (16 or 32 bit 888 RGB), but nothing explicitly about
blending or alpha.


Matt

> +
>  	/* WaFbcExceedCdClockThreshold:hsw,bdw */
>  	if ((IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) &&
>  	    cache->crtc.hsw_bdw_pixel_rate >= dev_priv->cdclk.hw.cdclk * 95 / 100) {
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index f7026e887fa9..4639ef9bde94 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -252,6 +252,7 @@ skl_update_plane(struct intel_plane *plane,
>  	uint32_t src_w = drm_rect_width(&plane_state->base.src) >> 16;
>  	uint32_t src_h = drm_rect_height(&plane_state->base.src) >> 16;
>  	unsigned long irqflags;
> +	u32 keymsk = 0, keymax = 0;
>  
>  	/* Sizes are 0 based */
>  	src_w--;
> @@ -267,10 +268,19 @@ skl_update_plane(struct intel_plane *plane,
>  
>  	if (key->flags) {
>  		I915_WRITE_FW(PLANE_KEYVAL(pipe, plane_id), key->min_value);
> -		I915_WRITE_FW(PLANE_KEYMAX(pipe, plane_id), key->max_value);
> -		I915_WRITE_FW(PLANE_KEYMSK(pipe, plane_id), key->channel_mask);
> +
> +		keymax |= key->max_value & 0xffffff;
> +		keymsk |= key->channel_mask & 0x3ffffff;
>  	}
>  
> +	keymax |= (plane_state->base.alpha >> 8) << PLANE_KEYMAX_ALPHA_SHIFT;
> +
> +	if (plane_state->base.alpha < 0xff00)
> +		keymsk |= PLANE_KEYMSK_ALPHA_ENABLE;
> +
> +	I915_WRITE_FW(PLANE_KEYMAX(pipe, plane_id), keymax);
> +	I915_WRITE_FW(PLANE_KEYMSK(pipe, plane_id), keymsk);
> +
>  	I915_WRITE_FW(PLANE_OFFSET(pipe, plane_id), (y << 16) | x);
>  	I915_WRITE_FW(PLANE_STRIDE(pipe, plane_id), stride);
>  	I915_WRITE_FW(PLANE_SIZE(pipe, plane_id), (src_h << 16) | src_w);
> @@ -1650,6 +1660,15 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
>  					  DRM_COLOR_YCBCR_BT709,
>  					  DRM_COLOR_YCBCR_LIMITED_RANGE);
>  
> +	if (INTEL_GEN(dev_priv) >= 9) {
> +		drm_plane_create_alpha_property(&intel_plane->base);
> +
> +		drm_plane_create_blend_mode_property(&intel_plane->base,
> +						     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
> +						     BIT(DRM_MODE_BLEND_PREMULTI) |
> +						     BIT(DRM_MODE_BLEND_COVERAGE));
> +	}
> +
>  	drm_plane_helper_add(&intel_plane->base, &intel_plane_helper_funcs);
>  
>  	return intel_plane;
> -- 
> 2.18.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Maarten Lankhorst Aug. 23, 2018, 6:16 a.m. UTC | #2
Op 23-08-18 om 00:57 schreef Matt Roper:
> On Wed, Aug 15, 2018 at 12:34:05PM +0200, Maarten Lankhorst wrote:
>> Add plane alpha blending support with the different blend modes.
>> This has been tested on a icl to show the correct results,
>> on earlier platforms small rounding errors cause issues. But this
>> already happens case with fully transparant or fully opaque RGB8888
>> fb's.
>>
>> The recommended HW workaround is to disable alpha blending when the
>> plane alpha is 0 (transparant, hide plane) or 0xff (opaque, disable blending).
>> This is easy to implement on any platform, so just do that.
>>
>> The tests for userspace are also available, and pass on gen11.
>>
>> Changes since v1:
>> - Change mistaken < 0xff0 to 0xff00.
>> - Only set PLANE_KEYMSK_ALPHA_ENABLE when plane alpha < 0xff00, ignore blend mode.
>> - Rework disabling FBC when per pixel alpha is used.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> One question and one minor suggestion inline below, but otherwise,
>
> Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
>
>> ---
>>  drivers/gpu/drm/i915/i915_drv.h      |  2 +
>>  drivers/gpu/drm/i915/i915_reg.h      |  2 +
>>  drivers/gpu/drm/i915/intel_display.c | 58 +++++++++++++++++++---------
>>  drivers/gpu/drm/i915/intel_fbc.c     |  8 ++++
>>  drivers/gpu/drm/i915/intel_sprite.c  | 23 ++++++++++-
>>  5 files changed, 73 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>> index 3fa56b960ef2..29f75da5fa8c 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.h
>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>> @@ -545,6 +545,8 @@ struct intel_fbc {
>>  			int adjusted_y;
>>  
>>  			int y;
>> +
>> +			uint16_t pixel_blend_mode;
>>  		} plane;
>>  
>>  		struct {
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> index 0c9f03dda569..93a1d87cdeb2 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -6561,8 +6561,10 @@ enum {
>>  #define _PLANE_KEYVAL_2_A			0x70294
>>  #define _PLANE_KEYMSK_1_A			0x70198
>>  #define _PLANE_KEYMSK_2_A			0x70298
>> +#define  PLANE_KEYMSK_ALPHA_ENABLE		(1 << 31)
>>  #define _PLANE_KEYMAX_1_A			0x701a0
>>  #define _PLANE_KEYMAX_2_A			0x702a0
>> +#define  PLANE_KEYMAX_ALPHA_SHIFT		24
>>  #define _PLANE_AUX_DIST_1_A			0x701c0
>>  #define _PLANE_AUX_DIST_2_A			0x702c0
>>  #define _PLANE_AUX_OFFSET_1_A			0x701c4
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index a0345e7d3c2b..aedad3674b0d 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -3167,6 +3167,12 @@ int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
>>  		return -EINVAL;
>>  	}
>>  
>> +	/* HW only has 8 bits pixel precision, disable plane if invisible */
>> +	if (!(plane_state->base.alpha >> 8)) {
>> +		plane_state->base.visible = false;
>> +		return 0;
>> +	}
>> +
>>  	if (!plane_state->base.visible)
>>  		return 0;
>>  
>> @@ -3512,30 +3518,39 @@ static u32 skl_plane_ctl_format(uint32_t pixel_format)
>>  	return 0;
>>  }
>>  
>> -/*
>> - * XXX: For ARBG/ABGR formats we default to expecting scanout buffers
>> - * to be already pre-multiplied. We need to add a knob (or a different
>> - * DRM_FORMAT) for user-space to configure that.
>> - */
>> -static u32 skl_plane_ctl_alpha(uint32_t pixel_format)
>> +static u32 skl_plane_ctl_alpha(const struct intel_plane_state *plane_state)
>>  {
>> -	switch (pixel_format) {
>> -	case DRM_FORMAT_ABGR8888:
>> -	case DRM_FORMAT_ARGB8888:
>> +	if (!plane_state->base.fb->format->has_alpha)
>> +		return PLANE_CTL_ALPHA_DISABLE;
>> +
>> +	switch (plane_state->base.pixel_blend_mode) {
>> +	case DRM_MODE_BLEND_PIXEL_NONE:
>> +		return PLANE_CTL_ALPHA_DISABLE;
>> +	case DRM_MODE_BLEND_PREMULTI:
>>  		return PLANE_CTL_ALPHA_SW_PREMULTIPLY;
>> +	case DRM_MODE_BLEND_COVERAGE:
>> +		return PLANE_CTL_ALPHA_HW_PREMULTIPLY;
>>  	default:
>> -		return PLANE_CTL_ALPHA_DISABLE;
>> +		MISSING_CASE(plane_state->base.pixel_blend_mode);
>> +		return 0;
> Maybe just add the MISSING_CASE line before the current return?  The
> macro still expands to 0, so leaving that makes it slightly more clear
> what the default fallback is.  Same for the glk_ function below.
Makes sense, will change that in v3. :)
>>  	}
>>  }
>>  
>> -static u32 glk_plane_color_ctl_alpha(uint32_t pixel_format)
>> +static u32 glk_plane_color_ctl_alpha(const struct intel_plane_state *plane_state)
>>  {
>> -	switch (pixel_format) {
>> -	case DRM_FORMAT_ABGR8888:
>> -	case DRM_FORMAT_ARGB8888:
>> +	if (!plane_state->base.fb->format->has_alpha)
>> +		return PLANE_COLOR_ALPHA_DISABLE;
>> +
>> +	switch (plane_state->base.pixel_blend_mode) {
>> +	case DRM_MODE_BLEND_PIXEL_NONE:
>> +		return PLANE_COLOR_ALPHA_DISABLE;
>> +	case DRM_MODE_BLEND_PREMULTI:
>>  		return PLANE_COLOR_ALPHA_SW_PREMULTIPLY;
>> +	case DRM_MODE_BLEND_COVERAGE:
>> +		return PLANE_COLOR_ALPHA_HW_PREMULTIPLY;
>>  	default:
>> -		return PLANE_COLOR_ALPHA_DISABLE;
>> +		MISSING_CASE(plane_state->base.pixel_blend_mode);
>> +		return 0;
>>  	}
>>  }
>>  
>> @@ -3611,7 +3626,7 @@ u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
>>  	plane_ctl = PLANE_CTL_ENABLE;
>>  
>>  	if (INTEL_GEN(dev_priv) < 10 && !IS_GEMINILAKE(dev_priv)) {
>> -		plane_ctl |= skl_plane_ctl_alpha(fb->format->format);
>> +		plane_ctl |= skl_plane_ctl_alpha(plane_state);
>>  		plane_ctl |=
>>  			PLANE_CTL_PIPE_GAMMA_ENABLE |
>>  			PLANE_CTL_PIPE_CSC_ENABLE |
>> @@ -3653,7 +3668,7 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
>>  		plane_color_ctl |= PLANE_COLOR_PIPE_CSC_ENABLE;
>>  	}
>>  	plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
>> -	plane_color_ctl |= glk_plane_color_ctl_alpha(fb->format->format);
>> +	plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);
>>  
>>  	if (fb->format->is_yuv) {
>>  		if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
>> @@ -13792,7 +13807,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>>  						   DRM_MODE_ROTATE_0,
>>  						   supported_rotations);
>>  
>> -	if (INTEL_GEN(dev_priv) >= 9)
>> +	if (INTEL_GEN(dev_priv) >= 9) {
>>  		drm_plane_create_color_properties(&primary->base,
>>  						  BIT(DRM_COLOR_YCBCR_BT601) |
>>  						  BIT(DRM_COLOR_YCBCR_BT709),
>> @@ -13801,6 +13816,13 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>>  						  DRM_COLOR_YCBCR_BT709,
>>  						  DRM_COLOR_YCBCR_LIMITED_RANGE);
>>  
>> +		drm_plane_create_alpha_property(&primary->base);
>> +		drm_plane_create_blend_mode_property(&primary->base,
>> +						     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
>> +						     BIT(DRM_MODE_BLEND_PREMULTI) |
>> +						     BIT(DRM_MODE_BLEND_COVERAGE));
>> +	}
>> +
>>  	drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);
>>  
>>  	return primary;
>> diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
>> index 75a6bbf3ada1..42a49fe34ba3 100644
>> --- a/drivers/gpu/drm/i915/intel_fbc.c
>> +++ b/drivers/gpu/drm/i915/intel_fbc.c
>> @@ -674,6 +674,8 @@ static void intel_fbc_update_state_cache(struct intel_crtc *crtc,
>>  	cache->plane.adjusted_y = plane_state->main.y;
>>  	cache->plane.y = plane_state->base.src.y1 >> 16;
>>  
>> +	cache->plane.pixel_blend_mode = plane_state->base.pixel_blend_mode;
>> +
>>  	if (!cache->plane.visible)
>>  		return;
>>  
>> @@ -748,6 +750,12 @@ static bool intel_fbc_can_activate(struct intel_crtc *crtc)
>>  		return false;
>>  	}
>>  
>> +	if (cache->plane.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
>> +	    cache->fb.format->has_alpha) {
>> +		fbc->no_fbc_reason = "per-pixel alpha blending is incompatible with FBC";
>> +		return false;
>> +	}
> This sounds reasonable, but is there somewhere in the b-spec that
> explains this explicitly?  The FBC_CTL description lists pixel format
> restrictions (16 or 32 bit 888 RGB), but nothing explicitly about
> blending or alpha.
PLANE_COLOR_CTL alpha mode, and PLANE_CTL's alpha mode both mention
in bspec that per pixel alpha is not compatible with FBC. :)

~Maarten
>
> Matt
>
>> +
>>  	/* WaFbcExceedCdClockThreshold:hsw,bdw */
>>  	if ((IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) &&
>>  	    cache->crtc.hsw_bdw_pixel_rate >= dev_priv->cdclk.hw.cdclk * 95 / 100) {
>> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
>> index f7026e887fa9..4639ef9bde94 100644
>> --- a/drivers/gpu/drm/i915/intel_sprite.c
>> +++ b/drivers/gpu/drm/i915/intel_sprite.c
>> @@ -252,6 +252,7 @@ skl_update_plane(struct intel_plane *plane,
>>  	uint32_t src_w = drm_rect_width(&plane_state->base.src) >> 16;
>>  	uint32_t src_h = drm_rect_height(&plane_state->base.src) >> 16;
>>  	unsigned long irqflags;
>> +	u32 keymsk = 0, keymax = 0;
>>  
>>  	/* Sizes are 0 based */
>>  	src_w--;
>> @@ -267,10 +268,19 @@ skl_update_plane(struct intel_plane *plane,
>>  
>>  	if (key->flags) {
>>  		I915_WRITE_FW(PLANE_KEYVAL(pipe, plane_id), key->min_value);
>> -		I915_WRITE_FW(PLANE_KEYMAX(pipe, plane_id), key->max_value);
>> -		I915_WRITE_FW(PLANE_KEYMSK(pipe, plane_id), key->channel_mask);
>> +
>> +		keymax |= key->max_value & 0xffffff;
>> +		keymsk |= key->channel_mask & 0x3ffffff;
>>  	}
>>  
>> +	keymax |= (plane_state->base.alpha >> 8) << PLANE_KEYMAX_ALPHA_SHIFT;
>> +
>> +	if (plane_state->base.alpha < 0xff00)
>> +		keymsk |= PLANE_KEYMSK_ALPHA_ENABLE;
>> +
>> +	I915_WRITE_FW(PLANE_KEYMAX(pipe, plane_id), keymax);
>> +	I915_WRITE_FW(PLANE_KEYMSK(pipe, plane_id), keymsk);
>> +
>>  	I915_WRITE_FW(PLANE_OFFSET(pipe, plane_id), (y << 16) | x);
>>  	I915_WRITE_FW(PLANE_STRIDE(pipe, plane_id), stride);
>>  	I915_WRITE_FW(PLANE_SIZE(pipe, plane_id), (src_h << 16) | src_w);
>> @@ -1650,6 +1660,15 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
>>  					  DRM_COLOR_YCBCR_BT709,
>>  					  DRM_COLOR_YCBCR_LIMITED_RANGE);
>>  
>> +	if (INTEL_GEN(dev_priv) >= 9) {
>> +		drm_plane_create_alpha_property(&intel_plane->base);
>> +
>> +		drm_plane_create_blend_mode_property(&intel_plane->base,
>> +						     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
>> +						     BIT(DRM_MODE_BLEND_PREMULTI) |
>> +						     BIT(DRM_MODE_BLEND_COVERAGE));
>> +	}
>> +
>>  	drm_plane_helper_add(&intel_plane->base, &intel_plane_helper_funcs);
>>  
>>  	return intel_plane;
>> -- 
>> 2.18.0
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Maarten Lankhorst Oct. 2, 2018, 10:51 a.m. UTC | #3
Op 23-08-18 om 00:57 schreef Matt Roper:
> On Wed, Aug 15, 2018 at 12:34:05PM +0200, Maarten Lankhorst wrote:
>> Add plane alpha blending support with the different blend modes.
>> This has been tested on a icl to show the correct results,
>> on earlier platforms small rounding errors cause issues. But this
>> already happens case with fully transparant or fully opaque RGB8888
>> fb's.
>>
>> The recommended HW workaround is to disable alpha blending when the
>> plane alpha is 0 (transparant, hide plane) or 0xff (opaque, disable blending).
>> This is easy to implement on any platform, so just do that.
>>
>> The tests for userspace are also available, and pass on gen11.
>>
>> Changes since v1:
>> - Change mistaken < 0xff0 to 0xff00.
>> - Only set PLANE_KEYMSK_ALPHA_ENABLE when plane alpha < 0xff00, ignore blend mode.
>> - Rework disabling FBC when per pixel alpha is used.
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> One question and one minor suggestion inline below, but otherwise,
>
> Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
>
>> ---
>>  drivers/gpu/drm/i915/i915_drv.h      |  2 +
>>  drivers/gpu/drm/i915/i915_reg.h      |  2 +
>>  drivers/gpu/drm/i915/intel_display.c | 58 +++++++++++++++++++---------
>>  drivers/gpu/drm/i915/intel_fbc.c     |  8 ++++
>>  drivers/gpu/drm/i915/intel_sprite.c  | 23 ++++++++++-
>>  5 files changed, 73 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>> index 3fa56b960ef2..29f75da5fa8c 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.h
>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>> @@ -545,6 +545,8 @@ struct intel_fbc {
>>  			int adjusted_y;
>>  
>>  			int y;
>> +
>> +			uint16_t pixel_blend_mode;
>>  		} plane;
>>  
>>  		struct {
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> index 0c9f03dda569..93a1d87cdeb2 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -6561,8 +6561,10 @@ enum {
>>  #define _PLANE_KEYVAL_2_A			0x70294
>>  #define _PLANE_KEYMSK_1_A			0x70198
>>  #define _PLANE_KEYMSK_2_A			0x70298
>> +#define  PLANE_KEYMSK_ALPHA_ENABLE		(1 << 31)
>>  #define _PLANE_KEYMAX_1_A			0x701a0
>>  #define _PLANE_KEYMAX_2_A			0x702a0
>> +#define  PLANE_KEYMAX_ALPHA_SHIFT		24
>>  #define _PLANE_AUX_DIST_1_A			0x701c0
>>  #define _PLANE_AUX_DIST_2_A			0x702c0
>>  #define _PLANE_AUX_OFFSET_1_A			0x701c4
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index a0345e7d3c2b..aedad3674b0d 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -3167,6 +3167,12 @@ int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
>>  		return -EINVAL;
>>  	}
>>  
>> +	/* HW only has 8 bits pixel precision, disable plane if invisible */
>> +	if (!(plane_state->base.alpha >> 8)) {
>> +		plane_state->base.visible = false;
>> +		return 0;
>> +	}
>> +
>>  	if (!plane_state->base.visible)
>>  		return 0;
>>  
>> @@ -3512,30 +3518,39 @@ static u32 skl_plane_ctl_format(uint32_t pixel_format)
>>  	return 0;
>>  }
>>  
>> -/*
>> - * XXX: For ARBG/ABGR formats we default to expecting scanout buffers
>> - * to be already pre-multiplied. We need to add a knob (or a different
>> - * DRM_FORMAT) for user-space to configure that.
>> - */
>> -static u32 skl_plane_ctl_alpha(uint32_t pixel_format)
>> +static u32 skl_plane_ctl_alpha(const struct intel_plane_state *plane_state)
>>  {
>> -	switch (pixel_format) {
>> -	case DRM_FORMAT_ABGR8888:
>> -	case DRM_FORMAT_ARGB8888:
>> +	if (!plane_state->base.fb->format->has_alpha)
>> +		return PLANE_CTL_ALPHA_DISABLE;
>> +
>> +	switch (plane_state->base.pixel_blend_mode) {
>> +	case DRM_MODE_BLEND_PIXEL_NONE:
>> +		return PLANE_CTL_ALPHA_DISABLE;
>> +	case DRM_MODE_BLEND_PREMULTI:
>>  		return PLANE_CTL_ALPHA_SW_PREMULTIPLY;
>> +	case DRM_MODE_BLEND_COVERAGE:
>> +		return PLANE_CTL_ALPHA_HW_PREMULTIPLY;
>>  	default:
>> -		return PLANE_CTL_ALPHA_DISABLE;
>> +		MISSING_CASE(plane_state->base.pixel_blend_mode);
>> +		return 0;
> Maybe just add the MISSING_CASE line before the current return?  The
> macro still expands to 0, so leaving that makes it slightly more clear
> what the default fallback is.  Same for the glk_ function below.
>
>>  	}
>>  }
>>  
>> -static u32 glk_plane_color_ctl_alpha(uint32_t pixel_format)
>> +static u32 glk_plane_color_ctl_alpha(const struct intel_plane_state *plane_state)
>>  {
>> -	switch (pixel_format) {
>> -	case DRM_FORMAT_ABGR8888:
>> -	case DRM_FORMAT_ARGB8888:
>> +	if (!plane_state->base.fb->format->has_alpha)
>> +		return PLANE_COLOR_ALPHA_DISABLE;
>> +
>> +	switch (plane_state->base.pixel_blend_mode) {
>> +	case DRM_MODE_BLEND_PIXEL_NONE:
>> +		return PLANE_COLOR_ALPHA_DISABLE;
>> +	case DRM_MODE_BLEND_PREMULTI:
>>  		return PLANE_COLOR_ALPHA_SW_PREMULTIPLY;
>> +	case DRM_MODE_BLEND_COVERAGE:
>> +		return PLANE_COLOR_ALPHA_HW_PREMULTIPLY;
>>  	default:
>> -		return PLANE_COLOR_ALPHA_DISABLE;
>> +		MISSING_CASE(plane_state->base.pixel_blend_mode);
>> +		return 0;
>>  	}
>>  }
>>  
>> @@ -3611,7 +3626,7 @@ u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
>>  	plane_ctl = PLANE_CTL_ENABLE;
>>  
>>  	if (INTEL_GEN(dev_priv) < 10 && !IS_GEMINILAKE(dev_priv)) {
>> -		plane_ctl |= skl_plane_ctl_alpha(fb->format->format);
>> +		plane_ctl |= skl_plane_ctl_alpha(plane_state);
>>  		plane_ctl |=
>>  			PLANE_CTL_PIPE_GAMMA_ENABLE |
>>  			PLANE_CTL_PIPE_CSC_ENABLE |
>> @@ -3653,7 +3668,7 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
>>  		plane_color_ctl |= PLANE_COLOR_PIPE_CSC_ENABLE;
>>  	}
>>  	plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
>> -	plane_color_ctl |= glk_plane_color_ctl_alpha(fb->format->format);
>> +	plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);
>>  
>>  	if (fb->format->is_yuv) {
>>  		if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
>> @@ -13792,7 +13807,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>>  						   DRM_MODE_ROTATE_0,
>>  						   supported_rotations);
>>  
>> -	if (INTEL_GEN(dev_priv) >= 9)
>> +	if (INTEL_GEN(dev_priv) >= 9) {
>>  		drm_plane_create_color_properties(&primary->base,
>>  						  BIT(DRM_COLOR_YCBCR_BT601) |
>>  						  BIT(DRM_COLOR_YCBCR_BT709),
>> @@ -13801,6 +13816,13 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
>>  						  DRM_COLOR_YCBCR_BT709,
>>  						  DRM_COLOR_YCBCR_LIMITED_RANGE);
>>  
>> +		drm_plane_create_alpha_property(&primary->base);
>> +		drm_plane_create_blend_mode_property(&primary->base,
>> +						     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
>> +						     BIT(DRM_MODE_BLEND_PREMULTI) |
>> +						     BIT(DRM_MODE_BLEND_COVERAGE));
>> +	}
>> +
>>  	drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);
>>  
>>  	return primary;
>> diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
>> index 75a6bbf3ada1..42a49fe34ba3 100644
>> --- a/drivers/gpu/drm/i915/intel_fbc.c
>> +++ b/drivers/gpu/drm/i915/intel_fbc.c
>> @@ -674,6 +674,8 @@ static void intel_fbc_update_state_cache(struct intel_crtc *crtc,
>>  	cache->plane.adjusted_y = plane_state->main.y;
>>  	cache->plane.y = plane_state->base.src.y1 >> 16;
>>  
>> +	cache->plane.pixel_blend_mode = plane_state->base.pixel_blend_mode;
>> +
>>  	if (!cache->plane.visible)
>>  		return;
>>  
>> @@ -748,6 +750,12 @@ static bool intel_fbc_can_activate(struct intel_crtc *crtc)
>>  		return false;
>>  	}
>>  
>> +	if (cache->plane.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
>> +	    cache->fb.format->has_alpha) {
>> +		fbc->no_fbc_reason = "per-pixel alpha blending is incompatible with FBC";
>> +		return false;
>> +	}
> This sounds reasonable, but is there somewhere in the b-spec that
> explains this explicitly?  The FBC_CTL description lists pixel format
> restrictions (16 or 32 bit 888 RGB), but nothing explicitly about
> blending or alpha.
>
Thanks for review btw, finally pushed now that DINQ backmerged the original patch. :)
Chris Wilson Oct. 4, 2018, 7:01 a.m. UTC | #4
Quoting Maarten Lankhorst (2018-10-02 11:51:45)
> Op 23-08-18 om 00:57 schreef Matt Roper:
> > On Wed, Aug 15, 2018 at 12:34:05PM +0200, Maarten Lankhorst wrote:
> >> Add plane alpha blending support with the different blend modes.
> >> This has been tested on a icl to show the correct results,
> >> on earlier platforms small rounding errors cause issues. But this
> >> already happens case with fully transparant or fully opaque RGB8888
> >> fb's.
> >>
> >> The recommended HW workaround is to disable alpha blending when the
> >> plane alpha is 0 (transparant, hide plane) or 0xff (opaque, disable blending).
> >> This is easy to implement on any platform, so just do that.
> >>
> >> The tests for userspace are also available, and pass on gen11.
> >>
> >> Changes since v1:
> >> - Change mistaken < 0xff0 to 0xff00.
> >> - Only set PLANE_KEYMSK_ALPHA_ENABLE when plane alpha < 0xff00, ignore blend mode.
> >> - Rework disabling FBC when per pixel alpha is used.
> >>
> >> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > One question and one minor suggestion inline below, but otherwise,
> >
> > Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
> >
> >> ---
> >>  drivers/gpu/drm/i915/i915_drv.h      |  2 +
> >>  drivers/gpu/drm/i915/i915_reg.h      |  2 +
> >>  drivers/gpu/drm/i915/intel_display.c | 58 +++++++++++++++++++---------
> >>  drivers/gpu/drm/i915/intel_fbc.c     |  8 ++++
> >>  drivers/gpu/drm/i915/intel_sprite.c  | 23 ++++++++++-
> >>  5 files changed, 73 insertions(+), 20 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> >> index 3fa56b960ef2..29f75da5fa8c 100644
> >> --- a/drivers/gpu/drm/i915/i915_drv.h
> >> +++ b/drivers/gpu/drm/i915/i915_drv.h
> >> @@ -545,6 +545,8 @@ struct intel_fbc {
> >>                      int adjusted_y;
> >>  
> >>                      int y;
> >> +
> >> +                    uint16_t pixel_blend_mode;
> >>              } plane;
> >>  
> >>              struct {
> >> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> >> index 0c9f03dda569..93a1d87cdeb2 100644
> >> --- a/drivers/gpu/drm/i915/i915_reg.h
> >> +++ b/drivers/gpu/drm/i915/i915_reg.h
> >> @@ -6561,8 +6561,10 @@ enum {
> >>  #define _PLANE_KEYVAL_2_A                   0x70294
> >>  #define _PLANE_KEYMSK_1_A                   0x70198
> >>  #define _PLANE_KEYMSK_2_A                   0x70298
> >> +#define  PLANE_KEYMSK_ALPHA_ENABLE          (1 << 31)
> >>  #define _PLANE_KEYMAX_1_A                   0x701a0
> >>  #define _PLANE_KEYMAX_2_A                   0x702a0
> >> +#define  PLANE_KEYMAX_ALPHA_SHIFT           24
> >>  #define _PLANE_AUX_DIST_1_A                 0x701c0
> >>  #define _PLANE_AUX_DIST_2_A                 0x702c0
> >>  #define _PLANE_AUX_OFFSET_1_A                       0x701c4
> >> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> >> index a0345e7d3c2b..aedad3674b0d 100644
> >> --- a/drivers/gpu/drm/i915/intel_display.c
> >> +++ b/drivers/gpu/drm/i915/intel_display.c
> >> @@ -3167,6 +3167,12 @@ int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
> >>              return -EINVAL;
> >>      }
> >>  
> >> +    /* HW only has 8 bits pixel precision, disable plane if invisible */
> >> +    if (!(plane_state->base.alpha >> 8)) {
> >> +            plane_state->base.visible = false;
> >> +            return 0;
> >> +    }
> >> +
> >>      if (!plane_state->base.visible)
> >>              return 0;
> >>  
> >> @@ -3512,30 +3518,39 @@ static u32 skl_plane_ctl_format(uint32_t pixel_format)
> >>      return 0;
> >>  }
> >>  
> >> -/*
> >> - * XXX: For ARBG/ABGR formats we default to expecting scanout buffers
> >> - * to be already pre-multiplied. We need to add a knob (or a different
> >> - * DRM_FORMAT) for user-space to configure that.
> >> - */
> >> -static u32 skl_plane_ctl_alpha(uint32_t pixel_format)
> >> +static u32 skl_plane_ctl_alpha(const struct intel_plane_state *plane_state)
> >>  {
> >> -    switch (pixel_format) {
> >> -    case DRM_FORMAT_ABGR8888:
> >> -    case DRM_FORMAT_ARGB8888:
> >> +    if (!plane_state->base.fb->format->has_alpha)
> >> +            return PLANE_CTL_ALPHA_DISABLE;
> >> +
> >> +    switch (plane_state->base.pixel_blend_mode) {
> >> +    case DRM_MODE_BLEND_PIXEL_NONE:
> >> +            return PLANE_CTL_ALPHA_DISABLE;
> >> +    case DRM_MODE_BLEND_PREMULTI:
> >>              return PLANE_CTL_ALPHA_SW_PREMULTIPLY;
> >> +    case DRM_MODE_BLEND_COVERAGE:
> >> +            return PLANE_CTL_ALPHA_HW_PREMULTIPLY;
> >>      default:
> >> -            return PLANE_CTL_ALPHA_DISABLE;
> >> +            MISSING_CASE(plane_state->base.pixel_blend_mode);
> >> +            return 0;
> > Maybe just add the MISSING_CASE line before the current return?  The
> > macro still expands to 0, so leaving that makes it slightly more clear
> > what the default fallback is.  Same for the glk_ function below.
> >
> >>      }
> >>  }
> >>  
> >> -static u32 glk_plane_color_ctl_alpha(uint32_t pixel_format)
> >> +static u32 glk_plane_color_ctl_alpha(const struct intel_plane_state *plane_state)
> >>  {
> >> -    switch (pixel_format) {
> >> -    case DRM_FORMAT_ABGR8888:
> >> -    case DRM_FORMAT_ARGB8888:
> >> +    if (!plane_state->base.fb->format->has_alpha)
> >> +            return PLANE_COLOR_ALPHA_DISABLE;
> >> +
> >> +    switch (plane_state->base.pixel_blend_mode) {
> >> +    case DRM_MODE_BLEND_PIXEL_NONE:
> >> +            return PLANE_COLOR_ALPHA_DISABLE;
> >> +    case DRM_MODE_BLEND_PREMULTI:
> >>              return PLANE_COLOR_ALPHA_SW_PREMULTIPLY;
> >> +    case DRM_MODE_BLEND_COVERAGE:
> >> +            return PLANE_COLOR_ALPHA_HW_PREMULTIPLY;
> >>      default:
> >> -            return PLANE_COLOR_ALPHA_DISABLE;
> >> +            MISSING_CASE(plane_state->base.pixel_blend_mode);
> >> +            return 0;
> >>      }
> >>  }
> >>  
> >> @@ -3611,7 +3626,7 @@ u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
> >>      plane_ctl = PLANE_CTL_ENABLE;
> >>  
> >>      if (INTEL_GEN(dev_priv) < 10 && !IS_GEMINILAKE(dev_priv)) {
> >> -            plane_ctl |= skl_plane_ctl_alpha(fb->format->format);
> >> +            plane_ctl |= skl_plane_ctl_alpha(plane_state);
> >>              plane_ctl |=
> >>                      PLANE_CTL_PIPE_GAMMA_ENABLE |
> >>                      PLANE_CTL_PIPE_CSC_ENABLE |
> >> @@ -3653,7 +3668,7 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
> >>              plane_color_ctl |= PLANE_COLOR_PIPE_CSC_ENABLE;
> >>      }
> >>      plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
> >> -    plane_color_ctl |= glk_plane_color_ctl_alpha(fb->format->format);
> >> +    plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);
> >>  
> >>      if (fb->format->is_yuv) {
> >>              if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
> >> @@ -13792,7 +13807,7 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
> >>                                                 DRM_MODE_ROTATE_0,
> >>                                                 supported_rotations);
> >>  
> >> -    if (INTEL_GEN(dev_priv) >= 9)
> >> +    if (INTEL_GEN(dev_priv) >= 9) {
> >>              drm_plane_create_color_properties(&primary->base,
> >>                                                BIT(DRM_COLOR_YCBCR_BT601) |
> >>                                                BIT(DRM_COLOR_YCBCR_BT709),
> >> @@ -13801,6 +13816,13 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
> >>                                                DRM_COLOR_YCBCR_BT709,
> >>                                                DRM_COLOR_YCBCR_LIMITED_RANGE);
> >>  
> >> +            drm_plane_create_alpha_property(&primary->base);
> >> +            drm_plane_create_blend_mode_property(&primary->base,
> >> +                                                 BIT(DRM_MODE_BLEND_PIXEL_NONE) |
> >> +                                                 BIT(DRM_MODE_BLEND_PREMULTI) |
> >> +                                                 BIT(DRM_MODE_BLEND_COVERAGE));
> >> +    }
> >> +
> >>      drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);
> >>  
> >>      return primary;
> >> diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
> >> index 75a6bbf3ada1..42a49fe34ba3 100644
> >> --- a/drivers/gpu/drm/i915/intel_fbc.c
> >> +++ b/drivers/gpu/drm/i915/intel_fbc.c
> >> @@ -674,6 +674,8 @@ static void intel_fbc_update_state_cache(struct intel_crtc *crtc,
> >>      cache->plane.adjusted_y = plane_state->main.y;
> >>      cache->plane.y = plane_state->base.src.y1 >> 16;
> >>  
> >> +    cache->plane.pixel_blend_mode = plane_state->base.pixel_blend_mode;
> >> +
> >>      if (!cache->plane.visible)
> >>              return;
> >>  
> >> @@ -748,6 +750,12 @@ static bool intel_fbc_can_activate(struct intel_crtc *crtc)
> >>              return false;
> >>      }
> >>  
> >> +    if (cache->plane.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
> >> +        cache->fb.format->has_alpha) {
> >> +            fbc->no_fbc_reason = "per-pixel alpha blending is incompatible with FBC";
> >> +            return false;
> >> +    }
> > This sounds reasonable, but is there somewhere in the b-spec that
> > explains this explicitly?  The FBC_CTL description lists pixel format
> > restrictions (16 or 32 bit 888 RGB), but nothing explicitly about
> > blending or alpha.
> >
> Thanks for review btw, finally pushed now that DINQ backmerged the original patch. :)

Since landing, we now have sporadic failures, but frequent enough across
the whole set of subtests, on kms_cursor_crc for gen9+. Coincidence?

I'd be tempted to say that we don't reset some residual state.
-Chris

Patch
diff mbox series

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 3fa56b960ef2..29f75da5fa8c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -545,6 +545,8 @@  struct intel_fbc {
 			int adjusted_y;
 
 			int y;
+
+			uint16_t pixel_blend_mode;
 		} plane;
 
 		struct {
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0c9f03dda569..93a1d87cdeb2 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6561,8 +6561,10 @@  enum {
 #define _PLANE_KEYVAL_2_A			0x70294
 #define _PLANE_KEYMSK_1_A			0x70198
 #define _PLANE_KEYMSK_2_A			0x70298
+#define  PLANE_KEYMSK_ALPHA_ENABLE		(1 << 31)
 #define _PLANE_KEYMAX_1_A			0x701a0
 #define _PLANE_KEYMAX_2_A			0x702a0
+#define  PLANE_KEYMAX_ALPHA_SHIFT		24
 #define _PLANE_AUX_DIST_1_A			0x701c0
 #define _PLANE_AUX_DIST_2_A			0x702c0
 #define _PLANE_AUX_OFFSET_1_A			0x701c4
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a0345e7d3c2b..aedad3674b0d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3167,6 +3167,12 @@  int skl_check_plane_surface(const struct intel_crtc_state *crtc_state,
 		return -EINVAL;
 	}
 
+	/* HW only has 8 bits pixel precision, disable plane if invisible */
+	if (!(plane_state->base.alpha >> 8)) {
+		plane_state->base.visible = false;
+		return 0;
+	}
+
 	if (!plane_state->base.visible)
 		return 0;
 
@@ -3512,30 +3518,39 @@  static u32 skl_plane_ctl_format(uint32_t pixel_format)
 	return 0;
 }
 
-/*
- * XXX: For ARBG/ABGR formats we default to expecting scanout buffers
- * to be already pre-multiplied. We need to add a knob (or a different
- * DRM_FORMAT) for user-space to configure that.
- */
-static u32 skl_plane_ctl_alpha(uint32_t pixel_format)
+static u32 skl_plane_ctl_alpha(const struct intel_plane_state *plane_state)
 {
-	switch (pixel_format) {
-	case DRM_FORMAT_ABGR8888:
-	case DRM_FORMAT_ARGB8888:
+	if (!plane_state->base.fb->format->has_alpha)
+		return PLANE_CTL_ALPHA_DISABLE;
+
+	switch (plane_state->base.pixel_blend_mode) {
+	case DRM_MODE_BLEND_PIXEL_NONE:
+		return PLANE_CTL_ALPHA_DISABLE;
+	case DRM_MODE_BLEND_PREMULTI:
 		return PLANE_CTL_ALPHA_SW_PREMULTIPLY;
+	case DRM_MODE_BLEND_COVERAGE:
+		return PLANE_CTL_ALPHA_HW_PREMULTIPLY;
 	default:
-		return PLANE_CTL_ALPHA_DISABLE;
+		MISSING_CASE(plane_state->base.pixel_blend_mode);
+		return 0;
 	}
 }
 
-static u32 glk_plane_color_ctl_alpha(uint32_t pixel_format)
+static u32 glk_plane_color_ctl_alpha(const struct intel_plane_state *plane_state)
 {
-	switch (pixel_format) {
-	case DRM_FORMAT_ABGR8888:
-	case DRM_FORMAT_ARGB8888:
+	if (!plane_state->base.fb->format->has_alpha)
+		return PLANE_COLOR_ALPHA_DISABLE;
+
+	switch (plane_state->base.pixel_blend_mode) {
+	case DRM_MODE_BLEND_PIXEL_NONE:
+		return PLANE_COLOR_ALPHA_DISABLE;
+	case DRM_MODE_BLEND_PREMULTI:
 		return PLANE_COLOR_ALPHA_SW_PREMULTIPLY;
+	case DRM_MODE_BLEND_COVERAGE:
+		return PLANE_COLOR_ALPHA_HW_PREMULTIPLY;
 	default:
-		return PLANE_COLOR_ALPHA_DISABLE;
+		MISSING_CASE(plane_state->base.pixel_blend_mode);
+		return 0;
 	}
 }
 
@@ -3611,7 +3626,7 @@  u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
 	plane_ctl = PLANE_CTL_ENABLE;
 
 	if (INTEL_GEN(dev_priv) < 10 && !IS_GEMINILAKE(dev_priv)) {
-		plane_ctl |= skl_plane_ctl_alpha(fb->format->format);
+		plane_ctl |= skl_plane_ctl_alpha(plane_state);
 		plane_ctl |=
 			PLANE_CTL_PIPE_GAMMA_ENABLE |
 			PLANE_CTL_PIPE_CSC_ENABLE |
@@ -3653,7 +3668,7 @@  u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
 		plane_color_ctl |= PLANE_COLOR_PIPE_CSC_ENABLE;
 	}
 	plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
-	plane_color_ctl |= glk_plane_color_ctl_alpha(fb->format->format);
+	plane_color_ctl |= glk_plane_color_ctl_alpha(plane_state);
 
 	if (fb->format->is_yuv) {
 		if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
@@ -13792,7 +13807,7 @@  intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 						   DRM_MODE_ROTATE_0,
 						   supported_rotations);
 
-	if (INTEL_GEN(dev_priv) >= 9)
+	if (INTEL_GEN(dev_priv) >= 9) {
 		drm_plane_create_color_properties(&primary->base,
 						  BIT(DRM_COLOR_YCBCR_BT601) |
 						  BIT(DRM_COLOR_YCBCR_BT709),
@@ -13801,6 +13816,13 @@  intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 						  DRM_COLOR_YCBCR_BT709,
 						  DRM_COLOR_YCBCR_LIMITED_RANGE);
 
+		drm_plane_create_alpha_property(&primary->base);
+		drm_plane_create_blend_mode_property(&primary->base,
+						     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
+						     BIT(DRM_MODE_BLEND_PREMULTI) |
+						     BIT(DRM_MODE_BLEND_COVERAGE));
+	}
+
 	drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);
 
 	return primary;
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 75a6bbf3ada1..42a49fe34ba3 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -674,6 +674,8 @@  static void intel_fbc_update_state_cache(struct intel_crtc *crtc,
 	cache->plane.adjusted_y = plane_state->main.y;
 	cache->plane.y = plane_state->base.src.y1 >> 16;
 
+	cache->plane.pixel_blend_mode = plane_state->base.pixel_blend_mode;
+
 	if (!cache->plane.visible)
 		return;
 
@@ -748,6 +750,12 @@  static bool intel_fbc_can_activate(struct intel_crtc *crtc)
 		return false;
 	}
 
+	if (cache->plane.pixel_blend_mode != DRM_MODE_BLEND_PIXEL_NONE &&
+	    cache->fb.format->has_alpha) {
+		fbc->no_fbc_reason = "per-pixel alpha blending is incompatible with FBC";
+		return false;
+	}
+
 	/* WaFbcExceedCdClockThreshold:hsw,bdw */
 	if ((IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) &&
 	    cache->crtc.hsw_bdw_pixel_rate >= dev_priv->cdclk.hw.cdclk * 95 / 100) {
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index f7026e887fa9..4639ef9bde94 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -252,6 +252,7 @@  skl_update_plane(struct intel_plane *plane,
 	uint32_t src_w = drm_rect_width(&plane_state->base.src) >> 16;
 	uint32_t src_h = drm_rect_height(&plane_state->base.src) >> 16;
 	unsigned long irqflags;
+	u32 keymsk = 0, keymax = 0;
 
 	/* Sizes are 0 based */
 	src_w--;
@@ -267,10 +268,19 @@  skl_update_plane(struct intel_plane *plane,
 
 	if (key->flags) {
 		I915_WRITE_FW(PLANE_KEYVAL(pipe, plane_id), key->min_value);
-		I915_WRITE_FW(PLANE_KEYMAX(pipe, plane_id), key->max_value);
-		I915_WRITE_FW(PLANE_KEYMSK(pipe, plane_id), key->channel_mask);
+
+		keymax |= key->max_value & 0xffffff;
+		keymsk |= key->channel_mask & 0x3ffffff;
 	}
 
+	keymax |= (plane_state->base.alpha >> 8) << PLANE_KEYMAX_ALPHA_SHIFT;
+
+	if (plane_state->base.alpha < 0xff00)
+		keymsk |= PLANE_KEYMSK_ALPHA_ENABLE;
+
+	I915_WRITE_FW(PLANE_KEYMAX(pipe, plane_id), keymax);
+	I915_WRITE_FW(PLANE_KEYMSK(pipe, plane_id), keymsk);
+
 	I915_WRITE_FW(PLANE_OFFSET(pipe, plane_id), (y << 16) | x);
 	I915_WRITE_FW(PLANE_STRIDE(pipe, plane_id), stride);
 	I915_WRITE_FW(PLANE_SIZE(pipe, plane_id), (src_h << 16) | src_w);
@@ -1650,6 +1660,15 @@  intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 					  DRM_COLOR_YCBCR_BT709,
 					  DRM_COLOR_YCBCR_LIMITED_RANGE);
 
+	if (INTEL_GEN(dev_priv) >= 9) {
+		drm_plane_create_alpha_property(&intel_plane->base);
+
+		drm_plane_create_blend_mode_property(&intel_plane->base,
+						     BIT(DRM_MODE_BLEND_PIXEL_NONE) |
+						     BIT(DRM_MODE_BLEND_PREMULTI) |
+						     BIT(DRM_MODE_BLEND_COVERAGE));
+	}
+
 	drm_plane_helper_add(&intel_plane->base, &intel_plane_helper_funcs);
 
 	return intel_plane;