Hey Inki,
Inki Dae wrote:
>
>
> 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 <tjakobi@xxxxxxxxxxxxxxxxxxxxx>
>> ---
>> 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.
Why do you think so? Because it certainly is.
>> + 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.
Can you explain why you think that index is always < 2 here?
>> + } 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,
And then we end up with the same static setup again, this is not what I
try to achieve here. The final goal is to let userspace provide layer
priorities, so all these calls should work with arbitrary priorities.
With best wishes,
Tobias
> 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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