2015년 11월 23일 01:09에 Tobias Jakobi 이(가) 쓴 글:
> This analyses the current layer configuration (which layers
> are enabled, which have alpha-pixelformat, etc.) and setups
> blending accordingly.
>
> We currently disable all kinds of blending for the bottom-most
> layer, since configuration of the mixer background is not
> yet exposed.
> Also blending is only enabled when the layer has a pixelformat
> with alpha attached.
>
> Signed-off-by: Tobias Jakobi <tjak...@math.uni-bielefeld.de>
> ---
> drivers/gpu/drm/exynos/exynos_mixer.c | 88
> +++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/exynos/regs-mixer.h | 1 +
> 2 files changed, 89 insertions(+)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c
> b/drivers/gpu/drm/exynos/exynos_mixer.c
> index 2c1cea3..ec77aad 100644
> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
> @@ -174,6 +174,21 @@ static const u8 filter_cr_horiz_tap4[] = {
> 70, 59, 48, 37, 27, 19, 11, 5,
> };
>
> +static inline bool is_alpha_format(const struct mixer_context* ctx, unsigned
> int win)
> +{
> + const struct drm_plane_state *state = ctx->planes[win].base.state;
> + const struct drm_framebuffer *fb = state->fb;
> +
> + switch (fb->pixel_format) {
> + case DRM_FORMAT_ARGB8888:
> + case DRM_FORMAT_ARGB1555:
> + case DRM_FORMAT_ARGB4444:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> static inline u32 vp_reg_read(struct mixer_resources *res, u32 reg_id)
> {
> return readl(res->vp_regs + reg_id);
> @@ -331,6 +346,79 @@ static void mixer_layer_priority(struct mixer_context
> *ctx)
> mixer_reg_write(&ctx->mixer_res, MXR_LAYER_CFG, val);
> }
>
> +/* Configure blending for bottom-most layer. */
> +static void mixer_bottom_layer(struct mixer_context *ctx,
> + const struct layer_cfg *cfg)
> +{
> + u32 val;
> + struct mixer_resources *res = &ctx->mixer_res;
> +
> + if (cfg->index == 2) {
> + val = 0; /* use defaults for video layer */
> + mixer_reg_write(res, MXR_VIDEO_CFG, val);
> + } else {
> + val = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */
> +
> + /* Don't blend bottom-most layer onto the mixer background. */
> + mixer_reg_writemask(res, MXR_GRAPHIC_CFG(cfg->index),
> + val, MXR_GRP_CFG_MISC_MASK);
> + }
> +}
> +
> +static void mixer_general_layer(struct mixer_context *ctx,
> + const struct layer_cfg *cfg)
> +{
> + u32 val;
> + struct mixer_resources *res = &ctx->mixer_res;
> +
> + if (is_alpha_format(ctx, cfg->index)) {
> + val = MXR_GRP_CFG_COLOR_KEY_DISABLE; /* no blank key */
> + val |= MXR_GRP_CFG_BLEND_PRE_MUL;
> + val |= MXR_GRP_CFG_PIXEL_BLEND_EN; /* blending based on pixel
> alpha */
> +
> + /* The video layer never has an alpha pixelformat. */
Looks like above comment isn't related to graphics layer.
> + mixer_reg_writemask(res, MXR_GRAPHIC_CFG(cfg->index),
> + val, MXR_GRP_CFG_MISC_MASK);
> + } else {
> + if (cfg->index == 2) {
> + /*
> + * 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;
> + mixer_reg_write(res, MXR_VIDEO_CFG, val);
Above 'if statement' wouldn't be called because cfg->index has always a value
less than 2
so it should be removed.
> + } else {
> + val = MXR_GRP_CFG_COLOR_KEY_DISABLE;
> + mixer_reg_writemask(res, MXR_GRAPHIC_CFG(cfg->index),
> + val, MXR_GRP_CFG_MISC_MASK);
> + }
> + }
> +}
> +
> +static void mixer_layer_blending(struct mixer_context *ctx, unsigned int
> enable_state)
> +{
> + unsigned int i, index;
> + bool bottom_layer = false;
> +
> + for (i = 0; i < ctx->num_layer; ++i) {
> + index = ctx->layer_cfg[i].index;
> +
> + /* Skip layer if it's not enabled. */
> + if (!(enable_state & (1 << index)))
> + continue;
> +
> + /* Bottom layer needs special handling. */
> + if (bottom_layer) {
> + mixer_general_layer(ctx, &ctx->layer_cfg[i]);
> + } else {
> + mixer_bottom_layer(ctx, &ctx->layer_cfg[i]);
> + bottom_layer = true;
> + }
I think above codes could be more cleanned up like below if I understood
correctly,
if (cfg->index == 2) {
val = 0;
mixer_reg_write(res, MXR_VIDEO_CFG, val);
} else {
mixer_general_layer(ctx, &ctx->layer_cfg[i]);
}
It'd be better to use a macro - i.e., VIDEO_LAYER - instead of 2.
And how about changing the function name, mixer_general_layer to
mixer_grp_layer_set_blending?
Or how about just adding all codes of the function?
Thanks,
Inki Dae
> + }
> +}
> +
> static void mixer_vsync_set_update(struct mixer_context *ctx, bool enable)
> {
> struct mixer_resources *res = &ctx->mixer_res;
> diff --git a/drivers/gpu/drm/exynos/regs-mixer.h
> b/drivers/gpu/drm/exynos/regs-mixer.h
> index ac60260..118872e 100644
> --- a/drivers/gpu/drm/exynos/regs-mixer.h
> +++ b/drivers/gpu/drm/exynos/regs-mixer.h
> @@ -113,6 +113,7 @@
> #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_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)
>
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