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Subject[PATCH v2 1/2] drm/exynos: fimd: Make plane alpha configurable
Date
The fimd hardware supports variable plane alpha. Currently planes
are opaque, make this configurable.

Tested on TRATS2 with Exynos 4412 CPU, on top of linux-next-20181019.

Signed-off-by: Christoph Manszewski <c.manszewski@samsung.com>
---
v2 changes:
- write blue lower ALPHA0 value correctly,
- set ALPHA1 to zero,
- move local variables from set_bldmod to set_pixfmt,
drivers/gpu/drm/exynos/exynos_drm_fimd.c | 75 +++++++++++++++++++++++---------
include/video/samsung_fimd.h | 1 +
2 files changed, 55 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index b7f56935a46b..9c4ff60326b9 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -229,6 +229,21 @@ static const uint32_t fimd_formats[] = {
DRM_FORMAT_ARGB8888,
};

+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 fimd_set_bits(struct fimd_context *ctx, u32 reg, u32 mask,
+ u32 val)
+{
+ val = (val & mask) | (readl(ctx->regs + reg) & ~mask);
+ writel(val, ctx->regs + reg);
+}
+
static int fimd_enable_vblank(struct exynos_drm_crtc *crtc)
{
struct fimd_context *ctx = crtc->ctx;
@@ -552,13 +567,43 @@ static void fimd_commit(struct exynos_drm_crtc *crtc)
writel(val, ctx->regs + VIDCON0);
}

+static void fimd_win_set_bldmod(struct fimd_context *ctx, unsigned int win,
+ unsigned int alpha)
+{
+ u32 win_alpha_l = (alpha >> 8) & 0xf;
+ u32 win_alpha_h = alpha >> 12;
+ u32 val = 0;
+
+ /* OSD alpha */
+ val = VIDISD14C_ALPHA0_R(win_alpha_h) |
+ VIDISD14C_ALPHA0_G(win_alpha_h) |
+ VIDISD14C_ALPHA0_B(win_alpha_h) |
+ VIDISD14C_ALPHA1_R(0x0) |
+ VIDISD14C_ALPHA1_G(0x0) |
+ VIDISD14C_ALPHA1_B(0x0);
+ writel(val, ctx->regs + VIDOSD_C(win));
+
+ val = VIDW_ALPHA_R(win_alpha_l) | VIDW_ALPHA_G(win_alpha_l) |
+ VIDW_ALPHA_B(win_alpha_l);
+ writel(val, ctx->regs + VIDWnALPHA0(win));
+
+ val = VIDW_ALPHA_R(0x0) | VIDW_ALPHA_G(0x0) |
+ VIDW_ALPHA_B(0x0);
+ writel(val, ctx->regs + VIDWnALPHA1(win));
+
+ fimd_set_bits(ctx, BLENDCON, BLENDCON_NEW_MASK,
+ BLENDCON_NEW_8BIT_ALPHA_VALUE);
+}

static void fimd_win_set_pixfmt(struct fimd_context *ctx, unsigned int win,
- uint32_t pixel_format, int width)
+ struct drm_framebuffer *fb, int width)
{
- unsigned long val;
-
- val = WINCONx_ENWIN;
+ struct exynos_drm_plane plane = ctx->planes[win];
+ struct exynos_drm_plane_state *state =
+ to_exynos_plane_state(plane.base.state);
+ uint32_t pixel_format = fb->format->format;
+ unsigned int alpha = state->base.alpha;
+ u32 val = WINCONx_ENWIN;

/*
* In case of s3c64xx, window 0 doesn't support alpha channel.
@@ -596,6 +641,7 @@ static void fimd_win_set_pixfmt(struct fimd_context *ctx, unsigned int win,
| WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
val |= WINCONx_WSWP;
val |= WINCONx_BURSTLEN_16WORD;
+ val |= WINCON1_ALPHA_MUL;
break;
}

@@ -615,22 +661,8 @@ static void fimd_win_set_pixfmt(struct fimd_context *ctx, unsigned int win,
writel(val, ctx->regs + WINCON(win));

/* hardware window 0 doesn't support alpha channel. */
- if (win != 0) {
- /* OSD alpha */
- val = VIDISD14C_ALPHA0_R(0xf) |
- VIDISD14C_ALPHA0_G(0xf) |
- VIDISD14C_ALPHA0_B(0xf) |
- VIDISD14C_ALPHA1_R(0xf) |
- VIDISD14C_ALPHA1_G(0xf) |
- VIDISD14C_ALPHA1_B(0xf);
-
- writel(val, ctx->regs + VIDOSD_C(win));
-
- val = VIDW_ALPHA_R(0xf) | VIDW_ALPHA_G(0xf) |
- VIDW_ALPHA_G(0xf);
- writel(val, ctx->regs + VIDWnALPHA0(win));
- writel(val, ctx->regs + VIDWnALPHA1(win));
- }
+ if (win != 0)
+ fimd_win_set_bldmod(ctx, win, alpha);
}

static void fimd_win_set_colkey(struct fimd_context *ctx, unsigned int win)
@@ -786,7 +818,7 @@ static void fimd_update_plane(struct exynos_drm_crtc *crtc,
DRM_DEBUG_KMS("osd size = 0x%x\n", (unsigned int)val);
}

- fimd_win_set_pixfmt(ctx, win, fb->format->format, state->src.w);
+ fimd_win_set_pixfmt(ctx, win, fb, state->src.w);

/* hardware window 0 doesn't support color key. */
if (win != 0)
@@ -988,6 +1020,7 @@ static int fimd_bind(struct device *dev, struct device *master, void *data)
ctx->configs[i].num_pixel_formats = ARRAY_SIZE(fimd_formats);
ctx->configs[i].zpos = i;
ctx->configs[i].type = fimd_win_types[i];
+ ctx->configs[i].capabilities = capabilities[i];
ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
&ctx->configs[i]);
if (ret)
diff --git a/include/video/samsung_fimd.h b/include/video/samsung_fimd.h
index d8fc96ed11e9..f070b7c0d2cf 100644
--- a/include/video/samsung_fimd.h
+++ b/include/video/samsung_fimd.h
@@ -211,6 +211,7 @@
#define WINCON0_BPPMODE_24BPP_888 (0xb << 2)

#define WINCON1_LOCALSEL_CAMIF (1 << 23)
+#define WINCON1_ALPHA_MUL (1 << 7)
#define WINCON1_BLD_PIX (1 << 6)
#define WINCON1_BPPMODE_MASK (0xf << 2)
#define WINCON1_BPPMODE_SHIFT 2
--
2.7.4
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