[PATCH 1/3] drm/exynos: drm_plane: Correct exynos_drm_plane_reset

[PATCH 1/3] drm/exynos: drm_plane: Correct exynos_drm_plane_reset

[Christoph Manszewski]

Make use of helper functions in exynos_drm_plane_reset in order to set
all default values. Currently alpha isn't set during reset.

Signed-off-by: Christoph Manszewski <c.manszewski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_plane.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index dba29aec59b4..755ca0e9ead2 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -131,16 +131,14 @@ static void exynos_drm_plane_reset(struct drm_plane *plane)
 
 	if (plane->state) {
 		exynos_state = to_exynos_plane_state(plane->state);
-		if (exynos_state->base.fb)
-			drm_framebuffer_put(exynos_state->base.fb);
+		__drm_atomic_helper_plane_destroy_state(plane->state);
 		kfree(exynos_state);
 		plane->state = NULL;
 	}
 
 	exynos_state = kzalloc(sizeof(*exynos_state), GFP_KERNEL);
 	if (exynos_state) {
-		plane->state = &exynos_state->base;
-		plane->state->plane = plane;
+		__drm_atomic_helper_plane_reset(plane, &exynos_state->base);
 		plane->state->zpos = exynos_plane->config->zpos;
 	}
 }
-- 
2.7.4

[PATCH 2/3] drm/exynos: mixer: Make pixel blend mode configurable

[Christoph Manszewski]

The mixer hardware supports both premultiplied alpha and
non-premultiplied alpha. Currently premultiplied alpha is default, make
this configurable.

Tested on Odroid-U3 with Exynos 4412 CPU, kernel next-20180913
using modetest.

Signed-off-by: Christoph Manszewski <c.manszewski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.h   |  1 +
 drivers/gpu/drm/exynos/exynos_drm_plane.c |  7 +++++++
 drivers/gpu/drm/exynos/exynos_mixer.c     | 27 +++++++++++++++++++++------
 3 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index c737c4bd2c19..1cb26d8c66f9 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -92,6 +92,7 @@ struct exynos_drm_plane {
 #define EXYNOS_DRM_PLANE_CAP_SCALE	(1 << 1)
 #define EXYNOS_DRM_PLANE_CAP_ZPOS	(1 << 2)
 #define EXYNOS_DRM_PLANE_CAP_TILE	(1 << 3)
+#define EXYNOS_DRM_PLANE_CAP_PIX_BLEND	(1 << 4)
 
 /*
  * Exynos DRM plane configuration structure.
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index 755ca0e9ead2..236408906f1f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -298,6 +298,10 @@ int exynos_plane_init(struct drm_device *dev,
 		      const struct exynos_drm_plane_config *config)
 {
 	int err;
+	unsigned int supported_modes = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
+				       BIT(DRM_MODE_BLEND_PREMULTI) |
+				       BIT(DRM_MODE_BLEND_COVERAGE);
+	struct drm_plane *plane = &exynos_plane->base;
 
 	err = drm_universal_plane_init(dev, &exynos_plane->base,
 				       1 << dev->mode_config.num_crtc,
@@ -318,5 +322,8 @@ int exynos_plane_init(struct drm_device *dev,
 	exynos_plane_attach_zpos_property(&exynos_plane->base, config->zpos,
 			   !(config->capabilities & EXYNOS_DRM_PLANE_CAP_ZPOS));
 
+	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_PIX_BLEND)
+		drm_plane_create_blend_mode_property(plane, supported_modes);
+
 	return 0;
 }
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index ffbf4a950f69..721b63e92b28 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -131,14 +131,16 @@ static const struct exynos_drm_plane_config plane_configs[MIXER_WIN_NR] = {
 		.pixel_formats = mixer_formats,
 		.num_pixel_formats = ARRAY_SIZE(mixer_formats),
 		.capabilities = EXYNOS_DRM_PLANE_CAP_DOUBLE |
-				EXYNOS_DRM_PLANE_CAP_ZPOS,
+				EXYNOS_DRM_PLANE_CAP_ZPOS |
+				EXYNOS_DRM_PLANE_CAP_PIX_BLEND,
 	}, {
 		.zpos = 1,
 		.type = DRM_PLANE_TYPE_CURSOR,
 		.pixel_formats = mixer_formats,
 		.num_pixel_formats = ARRAY_SIZE(mixer_formats),
 		.capabilities = EXYNOS_DRM_PLANE_CAP_DOUBLE |
-				EXYNOS_DRM_PLANE_CAP_ZPOS,
+				EXYNOS_DRM_PLANE_CAP_ZPOS |
+				EXYNOS_DRM_PLANE_CAP_PIX_BLEND,
 	}, {
 		.zpos = 2,
 		.type = DRM_PLANE_TYPE_OVERLAY,
@@ -309,15 +311,22 @@ static void vp_default_filter(struct mixer_context *ctx)
 }
 
 static void mixer_cfg_gfx_blend(struct mixer_context *ctx, unsigned int win,
-				bool alpha)
+				unsigned int pixel_alpha)
 {
 	u32 val;
 
 	val  = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */
-	if (alpha) {
-		/* blending based on pixel alpha */
+	switch (pixel_alpha) {
+	case DRM_MODE_BLEND_PIXEL_NONE:
+		break;
+	case DRM_MODE_BLEND_COVERAGE:
+		val |= MXR_GRP_CFG_PIXEL_BLEND_EN;
+		break;
+	case DRM_MODE_BLEND_PREMULTI:
+	default:
 		val |= MXR_GRP_CFG_BLEND_PRE_MUL;
 		val |= MXR_GRP_CFG_PIXEL_BLEND_EN;
+		break;
 	}
 	mixer_reg_writemask(ctx, MXR_GRAPHIC_CFG(win),
 			    val, MXR_GRP_CFG_MISC_MASK);
@@ -553,10 +562,16 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
 	unsigned int win = plane->index;
 	unsigned int x_ratio = 0, y_ratio = 0;
 	unsigned int dst_x_offset, dst_y_offset;
+	unsigned int pixel_alpha;
 	dma_addr_t dma_addr;
 	unsigned int fmt;
 	u32 val;
 
+	if (fb->format->has_alpha)
+		pixel_alpha = state->base.pixel_blend_mode;
+	else
+		pixel_alpha = DRM_MODE_BLEND_PIXEL_NONE;
+
 	switch (fb->format->format) {
 	case DRM_FORMAT_XRGB4444:
 	case DRM_FORMAT_ARGB4444:
@@ -616,7 +631,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
 	mixer_reg_write(ctx, MXR_GRAPHIC_BASE(win), dma_addr);
 
 	mixer_cfg_layer(ctx, win, priority, true);
-	mixer_cfg_gfx_blend(ctx, win, fb->format->has_alpha);
+	mixer_cfg_gfx_blend(ctx, win, pixel_alpha);
 
 	/* layer update mandatory for mixer 16.0.33.0 */
 	if (ctx->mxr_ver == MXR_VER_16_0_33_0 ||
-- 
2.7.4

[PATCH 3/3] drm/exynos: mixer: Make plane alpha configurable

[Christoph Manszewski]

The mixer hardware supports variable plane alpha. Currently planes are
opaque, make this configurable.

Tested on Odroid-U3 with Exynos 4412 CPU, kernel next-20180913
using modetest.

Signed-off-by: Christoph Manszewski <c.manszewski@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.h   |  1 +
 drivers/gpu/drm/exynos/exynos_drm_plane.c |  3 +++
 drivers/gpu/drm/exynos/exynos_mixer.c     | 37 ++++++++++++++++++-------------
 drivers/gpu/drm/exynos/regs-mixer.h       |  5 ++++-
 4 files changed, 30 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index 1cb26d8c66f9..ec1d5bcac61a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -93,6 +93,7 @@ struct exynos_drm_plane {
 #define EXYNOS_DRM_PLANE_CAP_ZPOS	(1 << 2)
 #define EXYNOS_DRM_PLANE_CAP_TILE	(1 << 3)
 #define EXYNOS_DRM_PLANE_CAP_PIX_BLEND	(1 << 4)
+#define EXYNOS_DRM_PLANE_CAP_WIN_BLEND	(1 << 5)
 
 /*
  * Exynos DRM plane configuration structure.
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index 236408906f1f..df0508e0e49e 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -325,5 +325,8 @@ int exynos_plane_init(struct drm_device *dev,
 	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_PIX_BLEND)
 		drm_plane_create_blend_mode_property(plane, supported_modes);
 
+	if (config->capabilities & EXYNOS_DRM_PLANE_CAP_WIN_BLEND)
+		drm_plane_create_alpha_property(plane);
+
 	return 0;
 }
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 721b63e92b28..e3a4ecbc503b 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -132,7 +132,8 @@ static const struct exynos_drm_plane_config plane_configs[MIXER_WIN_NR] = {
 		.num_pixel_formats = ARRAY_SIZE(mixer_formats),
 		.capabilities = EXYNOS_DRM_PLANE_CAP_DOUBLE |
 				EXYNOS_DRM_PLANE_CAP_ZPOS |
-				EXYNOS_DRM_PLANE_CAP_PIX_BLEND,
+				EXYNOS_DRM_PLANE_CAP_PIX_BLEND |
+				EXYNOS_DRM_PLANE_CAP_WIN_BLEND,
 	}, {
 		.zpos = 1,
 		.type = DRM_PLANE_TYPE_CURSOR,
@@ -140,7 +141,8 @@ static const struct exynos_drm_plane_config plane_configs[MIXER_WIN_NR] = {
 		.num_pixel_formats = ARRAY_SIZE(mixer_formats),
 		.capabilities = EXYNOS_DRM_PLANE_CAP_DOUBLE |
 				EXYNOS_DRM_PLANE_CAP_ZPOS |
-				EXYNOS_DRM_PLANE_CAP_PIX_BLEND,
+				EXYNOS_DRM_PLANE_CAP_PIX_BLEND |
+				EXYNOS_DRM_PLANE_CAP_WIN_BLEND,
 	}, {
 		.zpos = 2,
 		.type = DRM_PLANE_TYPE_OVERLAY,
@@ -148,7 +150,8 @@ static const struct exynos_drm_plane_config plane_configs[MIXER_WIN_NR] = {
 		.num_pixel_formats = ARRAY_SIZE(vp_formats),
 		.capabilities = EXYNOS_DRM_PLANE_CAP_SCALE |
 				EXYNOS_DRM_PLANE_CAP_ZPOS |
-				EXYNOS_DRM_PLANE_CAP_TILE,
+				EXYNOS_DRM_PLANE_CAP_TILE |
+				EXYNOS_DRM_PLANE_CAP_WIN_BLEND,
 	},
 };
 
@@ -311,8 +314,9 @@ static void vp_default_filter(struct mixer_context *ctx)
 }
 
 static void mixer_cfg_gfx_blend(struct mixer_context *ctx, unsigned int win,
-				unsigned int pixel_alpha)
+				unsigned int pixel_alpha, unsigned int alpha)
 {
+	u32 win_alpha = alpha >> 8;
 	u32 val;
 
 	val  = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */
@@ -328,21 +332,24 @@ static void mixer_cfg_gfx_blend(struct mixer_context *ctx, unsigned int win,
 		val |= MXR_GRP_CFG_PIXEL_BLEND_EN;
 		break;
 	}
+
+	if (alpha != DRM_BLEND_ALPHA_OPAQUE) {
+		val |= MXR_GRP_CFG_WIN_BLEND_EN;
+		val |= win_alpha;
+	}
 	mixer_reg_writemask(ctx, MXR_GRAPHIC_CFG(win),
 			    val, MXR_GRP_CFG_MISC_MASK);
 }
 
-static void mixer_cfg_vp_blend(struct mixer_context *ctx)
+static void mixer_cfg_vp_blend(struct mixer_context *ctx, unsigned int alpha)
 {
-	u32 val;
+	u32 win_alpha = alpha >> 8;
+	u32 val = 0;
 
-	/*
-	 * No blending at the moment since the NV12/NV21 pixelformats don't
-	 * have an alpha channel. However the mixer supports a global alpha
-	 * value for a layer. Once this functionality is exposed, we can
-	 * support blending of the video layer through this.
-	 */
-	val = 0;
+	if (alpha != DRM_BLEND_ALPHA_OPAQUE) {
+		val |= MXR_VID_CFG_BLEND_EN;
+		val |= win_alpha;
+	}
 	mixer_reg_write(ctx, MXR_VIDEO_CFG, val);
 }
 
@@ -538,7 +545,7 @@ static void vp_video_buffer(struct mixer_context *ctx,
 	vp_reg_write(ctx, VP_BOT_C_PTR, chroma_addr[1]);
 
 	mixer_cfg_layer(ctx, plane->index, priority, true);
-	mixer_cfg_vp_blend(ctx);
+	mixer_cfg_vp_blend(ctx, state->base.alpha);
 
 	spin_unlock_irqrestore(&ctx->reg_slock, flags);
 
@@ -631,7 +638,7 @@ static void mixer_graph_buffer(struct mixer_context *ctx,
 	mixer_reg_write(ctx, MXR_GRAPHIC_BASE(win), dma_addr);
 
 	mixer_cfg_layer(ctx, win, priority, true);
-	mixer_cfg_gfx_blend(ctx, win, pixel_alpha);
+	mixer_cfg_gfx_blend(ctx, win, pixel_alpha, state->base.alpha);
 
 	/* layer update mandatory for mixer 16.0.33.0 */
 	if (ctx->mxr_ver == MXR_VER_16_0_33_0 ||
diff --git a/drivers/gpu/drm/exynos/regs-mixer.h b/drivers/gpu/drm/exynos/regs-mixer.h
index 189cfa2470a8..d2b8194a07bf 100644
--- a/drivers/gpu/drm/exynos/regs-mixer.h
+++ b/drivers/gpu/drm/exynos/regs-mixer.h
@@ -109,12 +109,15 @@
 #define MXR_CFG_SCAN_HD			(1 << 0)
 #define MXR_CFG_SCAN_MASK		0x47
 
+/* bits for MXR_VIDEO_CFG */
+#define MXR_VID_CFG_BLEND_EN		(1 << 16)
+
 /* bits for MXR_GRAPHICn_CFG */
 #define MXR_GRP_CFG_COLOR_KEY_DISABLE	(1 << 21)
 #define MXR_GRP_CFG_BLEND_PRE_MUL	(1 << 20)
 #define MXR_GRP_CFG_WIN_BLEND_EN	(1 << 17)
 #define MXR_GRP_CFG_PIXEL_BLEND_EN	(1 << 16)
-#define MXR_GRP_CFG_MISC_MASK		((3 << 16) | (3 << 20))
+#define MXR_GRP_CFG_MISC_MASK		((3 << 16) | (3 << 20) | 0xff)
 #define MXR_GRP_CFG_FORMAT_VAL(x)	MXR_MASK_VAL(x, 11, 8)
 #define MXR_GRP_CFG_FORMAT_MASK		MXR_GRP_CFG_FORMAT_VAL(~0)
 #define MXR_GRP_CFG_ALPHA_VAL(x)	MXR_MASK_VAL(x, 7, 0)
-- 
2.7.4