Hey Inki,
Inki Dae wrote:
> Hi Tobias,
>
> 2015년 11월 23일 01:09에 Tobias Jakobi 이(가) 쓴 글:
>> First step in allowing a more generic way to setup complex
>> blending for the different layers.
>>
>> Signed-off-by: Tobias Jakobi <tjakobi@xxxxxxxxxxxxxxxxxxxxx>
>> ---
>> drivers/gpu/drm/exynos/exynos_mixer.c | 84 ++++++++++++++++++++++++++++++-----
>> 1 file changed, 73 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
>> index 7498c6e..2c1cea3 100644
>> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
>> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
>> @@ -63,6 +63,11 @@ struct mixer_resources {
>> struct clk *mout_mixer;
>> };
>>
>> +struct layer_cfg {
>> + unsigned int index;
>> + unsigned int priority;
>> +};
>> +
>> enum mixer_version_id {
>> MXR_VER_0_0_0_16,
>> MXR_VER_16_0_33_0,
>> @@ -92,6 +97,8 @@ struct mixer_context {
>> struct drm_device *drm_dev;
>> struct exynos_drm_crtc *crtc;
>> struct exynos_drm_plane planes[MIXER_WIN_NR];
>> + const struct layer_cfg *layer_cfg;
>> + unsigned int num_layer;
>> int pipe;
>> unsigned long flags;
>> bool interlace;
>> @@ -110,6 +117,34 @@ struct mixer_drv_data {
>> bool has_sclk;
>> };
>>
>> +/*
>> + * The default layer priorities for non-VP (video processor)
>> + * and VP mixer configurations.
>> + *
>> + * A higher priority means that the layer is at the top of
>> + * the layer stack.
>> + * Configurations have to be specified with its entries
>> + * sorted with increasing priority.
>> + *
>> + * The default config assumes the following usage scenario:
>> + * layer1: OSD [top]
>> + * layer0: main framebuffer
>> + * video layer: video overlay [bottom]
>> + * Note that the video layer is only usable when the
>> + * VP is available.
>> + */
>> +
>> +static const struct layer_cfg nonvp_default_cfg[] = {
>> + { .index = 0, .priority = 1 }, /* layer0 */
>> + { .index = 1, .priority = 2 }, /* layer1 */
>> +};
>> +
>> +static const struct layer_cfg vp_default_cfg[] = {
>> + { .index = 2, .priority = 1 }, /* video layer */
>> + { .index = 0, .priority = 2 }, /* layer0 */
>> + { .index = 1, .priority = 3 }, /* layer1 */
>> +};
>> +
>> static const u8 filter_y_horiz_tap8[] = {
>> 0, -1, -1, -1, -1, -1, -1, -1,
>> -1, -1, -1, -1, -1, 0, 0, 0,
>> @@ -268,6 +303,34 @@ static void vp_default_filter(struct mixer_resources *res)
>> filter_cr_horiz_tap4, sizeof(filter_cr_horiz_tap4));
>> }
>>
>> +static void mixer_layer_priority(struct mixer_context *ctx)
>> +{
>> + u32 val = 0;
>> + unsigned int i, priority;
>> +
>> + for (i = 0; i < ctx->num_layer; ++i) {
>> + priority = ctx->layer_cfg[i].priority;
>> + BUG_ON(priority > 15);
>
> What doesn constant, 15 mean? You need to clarify the meaning
> and please, use a macro instead.
If I read the specs correctly the layer priority is encoded with just
4-bits in the corresponding register. I'll add a define to make this
more clear.
> And it'd better to just return in this case so that the layer
> configuration can be set with a default value.
The point is that these (currently) are the default values that
mixer_layer_priority() sets.
The BUG_ON() is there to make sure that nobody changes
{vp,nonvp}_default_cfg[] later with illegal values.
With best wishes,
Tobias
> I think it'd be enough to print out warning message.
>
> Thanks,
> Inki Dae
>
>> +
>> + switch (ctx->layer_cfg[i].index) {
>> + case 0:
>> + val |= MXR_LAYER_CFG_GRP0_VAL(priority);
>> + break;
>> + case 1:
>> + val |= MXR_LAYER_CFG_GRP1_VAL(priority);
>> + break;
>> + case 2:
>> + val |= MXR_LAYER_CFG_VP_VAL(priority);
>> + break;
>> + default:
>> + BUG_ON(true);
>> + break;
>> + }
>> + }
>> +
>> + mixer_reg_write(&ctx->mixer_res, MXR_LAYER_CFG, val);
>> +}
>> +
>> static void mixer_vsync_set_update(struct mixer_context *ctx, bool enable)
>> {
>> struct mixer_resources *res = &ctx->mixer_res;
>> @@ -673,17 +736,7 @@ static void mixer_win_reset(struct mixer_context *ctx)
>> mixer_reg_writemask(res, MXR_STATUS, MXR_STATUS_16_BURST,
>> MXR_STATUS_BURST_MASK);
>>
>> - /* setting default layer priority: layer1 > layer0 > video
>> - * because typical usage scenario would be
>> - * layer1 - OSD
>> - * layer0 - framebuffer
>> - * video - video overlay
>> - */
>> - val = MXR_LAYER_CFG_GRP1_VAL(3);
>> - val |= MXR_LAYER_CFG_GRP0_VAL(2);
>> - if (ctx->vp_enabled)
>> - val |= MXR_LAYER_CFG_VP_VAL(1);
>> - mixer_reg_write(res, MXR_LAYER_CFG, val);
>> + mixer_layer_priority(ctx);
>>
>> /* setting background color */
>> mixer_reg_write(res, MXR_BG_COLOR0, 0x008080);
>> @@ -1209,6 +1262,15 @@ static int mixer_probe(struct platform_device *pdev)
>> ctx->vp_enabled = drv->is_vp_enabled;
>> ctx->has_sclk = drv->has_sclk;
>> ctx->mxr_ver = drv->version;
>> +
>> + if (drv->is_vp_enabled) {
>> + ctx->layer_cfg = vp_default_cfg;
>> + ctx->num_layer = ARRAY_SIZE(vp_default_cfg);
>> + } else {
>> + ctx->layer_cfg = nonvp_default_cfg;
>> + ctx->num_layer = ARRAY_SIZE(nonvp_default_cfg);
>> + }
>> +
>> init_waitqueue_head(&ctx->wait_vsync_queue);
>> atomic_set(&ctx->wait_vsync_event, 0);
>>
>>
--
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