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SubjectRe: [PATCH v2 2/2] drm/sun4i: Add alpha property for sun8i and sun50i VI layer
Date
Hi!

Dne ponedeljek, 30. december 2019 ob 19:08:42 CET je
roman.stratiienko@globallogic.com napisal(a):
> From: Roman Stratiienko <roman.stratiienko@globallogic.com>
>
> DE3.0 VI layers supports plane-global alpha channel.
> DE2.0 FCC block have GLOBAL_ALPHA register that can be used as alpha source
> for blender.
>
> Add alpha property to the DRM plane and connect it to the
> corresponding registers in the mixer.
>
> Signed-off-by: Roman Stratiienko <roman.stratiienko@globallogic.com>
> ---
> drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 46 +++++++++++++++++++++-----
> drivers/gpu/drm/sun4i/sun8i_vi_layer.h | 11 ++++++
> 2 files changed, 49 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c index 42d445d23773..db32a78c75d9
> 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> @@ -65,6 +65,36 @@ static void sun8i_vi_layer_enable(struct sun8i_mixer
> *mixer, int channel, }
> }
>
> +static void sun8i_vi_layer_update_alpha(struct sun8i_mixer *mixer, int
> channel, + int overlay, struct
drm_plane *plane)
> +{
> + u32 mask, val, ch_base;
> +
> + ch_base = sun8i_channel_base(mixer, channel);
> +
> + if (mixer->cfg->is_de3) {
> + mask = SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK |
> + SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_MASK;
> + val = SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA
> + (plane->state->alpha >> 8);
> +
> + val |= (plane->state->alpha == DRM_BLEND_ALPHA_OPAQUE) ?
> +
SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_PIXEL :
> +
SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_COMBINED;
> +
> + regmap_update_bits(mixer->engine.regs,
> +
SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base,
> +
overlay),
> + mask, val);
> + } else {
> + regmap_update_bits(mixer->engine.regs,
> +
SUN8I_MIXER_FCC_GLOBAL_ALPHA_REG,
> +
SUN8I_MIXER_FCC_GLOBAL_ALPHA_MASK,
> + SUN8I_MIXER_FCC_GLOBAL_ALPHA
> + (plane->state->alpha >>
8));

In general, this is fine, except I don't know how this will work on V3. V3 is
the only SoC which have 2 VI layers in one mixer. I checked DE2 BSP sources
and only only one VI alpha is defined in FCC, also for V3. BSP driver also
doesn't use this field at all, so I don't know if they missed it or it's really
only one alpha for both VI layers. I don't have V3 board, so I can't do any
experiment. To be on the safe side, we could check if mixer has > 1 VI plane
and if it is DE2 and skip adding alpha property for such combination for now.

What do you think?

Best regards,
Jernej

> + }
> +}
> +
> static int sun8i_vi_layer_update_coord(struct sun8i_mixer *mixer, int
> channel, int overlay, struct drm_plane *plane,
> unsigned int zpos)
> @@ -248,14 +278,6 @@ static int sun8i_vi_layer_update_formats(struct
> sun8i_mixer *mixer, int channel, SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base,
> overlay),
> SUN8I_MIXER_CHAN_VI_LAYER_ATTR_RGB_MODE,
val);
>
> - /* It seems that YUV formats use global alpha setting. */
> - if (mixer->cfg->is_de3)
> - regmap_update_bits(mixer->engine.regs,
> -
SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base,
> -
overlay),
> -
SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK,
> -
SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA(0xff));
> -
> return 0;
> }
>
> @@ -373,6 +395,8 @@ static void sun8i_vi_layer_atomic_update(struct
> drm_plane *plane,
>
> sun8i_vi_layer_update_coord(mixer, layer->channel,
> layer->overlay, plane, zpos);
> + sun8i_vi_layer_update_alpha(mixer, layer->channel,
> + layer->overlay, plane);
> sun8i_vi_layer_update_formats(mixer, layer->channel,
> layer->overlay, plane);
> sun8i_vi_layer_update_buffer(mixer, layer->channel,
> @@ -464,6 +488,12 @@ struct sun8i_vi_layer *sun8i_vi_layer_init_one(struct
> drm_device *drm,
>
> plane_cnt = mixer->cfg->ui_num + mixer->cfg->vi_num;
>
> + ret = drm_plane_create_alpha_property(&layer->plane);
> + if (ret) {
> + dev_err(drm->dev, "Couldn't add alpha property\n");
> + return ERR_PTR(ret);
> + }
> +
> ret = drm_plane_create_zpos_property(&layer->plane, index,
> 0, plane_cnt -
1);
> if (ret) {
> diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
> b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h index eaa6076f5dbc..48c399e1c86d
> 100644
> --- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
> +++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
> @@ -29,14 +29,25 @@
> #define SUN8I_MIXER_CHAN_VI_VDS_UV(base) \
> ((base) + 0xfc)
>
> +#define SUN8I_MIXER_FCC_GLOBAL_ALPHA_REG \
> + (0xAA000 + 0x90)
> +
> +#define SUN8I_MIXER_FCC_GLOBAL_ALPHA(x) ((x) << 24)
> +#define SUN8I_MIXER_FCC_GLOBAL_ALPHA_MASK GENMASK(31,
24)
> +
> #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_EN BIT(0)
> /* RGB mode should be set for RGB formats and cleared for YCbCr */
> #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_RGB_MODE BIT(15)
> #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_FBFMT_OFFSET 8
> #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_FBFMT_MASK GENMASK(12, 8)
> +#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_MASK GENMASK(2, 1)
> #define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK GENMASK(31, 24)
> #define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA(x) ((x) << 24)
>
> +#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_PIXEL ((0) << 1)
> +#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_LAYER ((1) << 1)
> +#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_COMBINED ((2) << 1)
> +
> #define SUN8I_MIXER_CHAN_VI_DS_N(x) ((x) << 16)
> #define SUN8I_MIXER_CHAN_VI_DS_M(x) ((x) << 0)




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