[PATCH v3 1/2] drm/exynos: decon: Make plane alpha configurable

* [PATCH v3 1/2] drm/exynos: decon: Make plane alpha configurable
       [not found] ` <CGME20181018125208eucas1p1e78fba86800edc4ceae4bbda95871ea1@eucas1p1.samsung.com>
@ 2018-10-18 12:51   ` Christoph Manszewski
  0 siblings, 0 replies; 2+ messages in thread
From: Christoph Manszewski @ 2018-10-18 12:51 UTC (permalink / raw)
  To: dri-devel
  Cc: Christoph Manszewski, Inki Dae, Joonyoung Shim, Seung-Woo Kim,
	Kyungmin Park, David Airlie, Kukjin Kim, Krzysztof Kozlowski,
	linux-arm-kernel, linux-samsung-soc, linux-kernel,
	Gustavo Padovan, Maarten Lankhorst, Sean Paul, Lowry Li,
	Bartlomiej Zolnierkiewicz, Marek Szyprowski, Andrzej Hajda

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

Tested on TM2 with Exynos 5433 CPU, on top of exynos-drm-next,
commit: c530174b90fa

Signed-off-by: Christoph Manszewski <c.manszewski@samsung.com>
---
v2 changes:
 - remove window blend property for the first (0) layer
 (currently zpos is immutable),
 - remove unused parameter in decon_win_set_bldmod,
 - move local variables to decon_win_set_pixfmt,
 - add alpha parameter in decon_win_set_bldmod,
 - don't call decon_win_set_bldmod for the first (0) layer,
 - move decon_win_set_bldmod call to bottom of decon_win_set_pixfmt,

 drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 33 +++++++++++++++++++++++++++
 drivers/gpu/drm/exynos/regs-decon5433.h       |  7 ++++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
index 94529aa82339..2578db16750d 100644
--- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -84,6 +84,14 @@ static const enum drm_plane_type decon_win_types[WINDOWS_NR] = {
 	[CURSON_WIN] = DRM_PLANE_TYPE_CURSOR,
 };
 
+static const unsigned int capabilities[WINDOWS_NR] = {
+	0,
+	EXYNOS_DRM_PLANE_CAP_WIN_BLEND,
+	EXYNOS_DRM_PLANE_CAP_WIN_BLEND,
+	EXYNOS_DRM_PLANE_CAP_WIN_BLEND,
+	EXYNOS_DRM_PLANE_CAP_WIN_BLEND,
+};
+
 static inline void decon_set_bits(struct decon_context *ctx, u32 reg, u32 mask,
 				  u32 val)
 {
@@ -259,9 +267,30 @@ static void decon_commit(struct exynos_drm_crtc *crtc)
 	decon_set_bits(ctx, DECON_UPDATE, STANDALONE_UPDATE_F, ~0);
 }
 
+
+static void decon_win_set_bldmod(struct decon_context *ctx, unsigned int win,
+				 unsigned int alpha)
+{
+	u32 win_alpha = alpha >> 8;
+	u32 val = 0;
+
+	if (alpha != DRM_BLEND_ALPHA_OPAQUE) {
+		val = VIDOSD_Wx_ALPHA_R_F(win_alpha) |
+		      VIDOSD_Wx_ALPHA_G_F(win_alpha) |
+		      VIDOSD_Wx_ALPHA_B_F(win_alpha);
+		decon_set_bits(ctx, DECON_VIDOSDxC(win),
+			       VIDOSDxC_ALPHA0_RGB_MASK, val);
+		decon_set_bits(ctx, DECON_BLENDCON, BLEND_NEW, BLEND_NEW);
+	}
+}
+
 static void decon_win_set_pixfmt(struct decon_context *ctx, unsigned int win,
 				 struct drm_framebuffer *fb)
 {
+	struct exynos_drm_plane plane = ctx->planes[win];
+	struct exynos_drm_plane_state *state =
+		to_exynos_plane_state(plane.base.state);
+	unsigned int alpha = state->base.alpha;
 	unsigned long val;
 
 	val = readl(ctx->addr + DECON_WINCONx(win));
@@ -288,6 +317,7 @@ static void decon_win_set_pixfmt(struct decon_context *ctx, unsigned int win,
 		val |= WINCONx_BPPMODE_32BPP_A8888;
 		val |= WINCONx_WSWP_F | WINCONx_BLD_PIX_F | WINCONx_ALPHA_SEL_F;
 		val |= WINCONx_BURSTLEN_16WORD;
+		val |= WINCONx_ALPHA_MUL_F;
 		break;
 	}
 
@@ -307,6 +337,8 @@ static void decon_win_set_pixfmt(struct decon_context *ctx, unsigned int win,
 	}
 
 	writel(val, ctx->addr + DECON_WINCONx(win));
+	if (win > 0)
+		decon_win_set_bldmod(ctx, win, alpha);
 }
 
 static void decon_shadow_protect(struct decon_context *ctx, bool protect)
@@ -561,6 +593,7 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
 		ctx->configs[win].num_pixel_formats = ARRAY_SIZE(decon_formats);
 		ctx->configs[win].zpos = win - ctx->first_win;
 		ctx->configs[win].type = decon_win_types[win];
+		ctx->configs[win].capabilities = capabilities[win];
 
 		ret = exynos_plane_init(drm_dev, &ctx->planes[win], win,
 					&ctx->configs[win]);
diff --git a/drivers/gpu/drm/exynos/regs-decon5433.h b/drivers/gpu/drm/exynos/regs-decon5433.h
index 19ad9e47945e..72648bda3142 100644
--- a/drivers/gpu/drm/exynos/regs-decon5433.h
+++ b/drivers/gpu/drm/exynos/regs-decon5433.h
@@ -104,6 +104,7 @@
 #define WINCONx_BURSTLEN_16WORD		(0x0 << 10)
 #define WINCONx_BURSTLEN_8WORD		(0x1 << 10)
 #define WINCONx_BURSTLEN_4WORD		(0x2 << 10)
+#define WINCONx_ALPHA_MUL_F		(1 << 7)
 #define WINCONx_BLD_PIX_F		(1 << 6)
 #define WINCONx_BPPMODE_MASK		(0xf << 2)
 #define WINCONx_BPPMODE_16BPP_565	(0x5 << 2)
@@ -121,6 +122,9 @@
 #define SHADOWCON_PROTECT_MASK		GENMASK(14, 10)
 #define SHADOWCON_Wx_PROTECT(n)		(1 << (10 + (n)))
 
+/* VIDOSDxC */
+#define VIDOSDxC_ALPHA0_RGB_MASK	(0xffffff)
+
 /* VIDOSDxD */
 #define VIDOSD_Wx_ALPHA_R_F(n)		(((n) & 0xff) << 16)
 #define VIDOSD_Wx_ALPHA_G_F(n)		(((n) & 0xff) << 8)
@@ -206,4 +210,7 @@
 #define CRCCTRL_CRCEN			(0x1 << 0)
 #define CRCCTRL_MASK			(0x7)
 
+/* BLENDCON */
+#define BLEND_NEW			(1 << 0)
+
 #endif /* EXYNOS_REGS_DECON5433_H */
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 2+ messages in thread