Hi,
On Tue, 2018-03-13 at 21:54 +0100, Maxime Ripard wrote:
> Our backend supports a per-plane alpha property. Support it through
> our new
> helper.
See one comment below. Otherwise, this is:
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
> Reviewed-by: Chen-Yu Tsai <wens@xxxxxxxx>
> Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/sun4i/sun4i_backend.c | 16 +++++++++++++---
> drivers/gpu/drm/sun4i/sun4i_backend.h | 3 +++
> drivers/gpu/drm/sun4i/sun4i_layer.c | 2 ++
> 3 files changed, 18 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c
> b/drivers/gpu/drm/sun4i/sun4i_backend.c
> index 092ade4ff6a5..98cd4a8a93ed 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> @@ -186,6 +186,15 @@ int sun4i_backend_update_layer_formats(struct
> sun4i_backend *backend,
> DRM_DEBUG_DRIVER("Switching display backend interlaced mode
> %s\n",
> interlaced ? "on" : "off");
>
> + val = SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state->alpha >>
> 8);
Have you checked that the alpha value expected by the hardware does
match the "premultiplied" alpha blemding equation?
> + if (state->alpha != DRM_BLEND_ALPHA_OPAQUE)
> + val |= SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN;
Maybe insert a newline for improved readability here?
> + regmap_update_bits(backend->engine.regs,
> + SUN4I_BACKEND_ATTCTL_REG0(layer),
> + SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MAS
> K |
> + SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN,
> + val);
> +
> ret = sun4i_backend_drm_format_to_layer(fb->format->format,
> &val);
> if (ret) {
> DRM_DEBUG_DRIVER("Invalid format\n");
> @@ -359,7 +368,7 @@ static int sun4i_backend_atomic_check(struct
> sunxi_engine *engine,
> DRM_DEBUG_DRIVER("Plane FB format is %s\n",
> drm_get_format_name(fb->format-
> >format,
> &format_name));
> - if (fb->format->has_alpha)
> + if (fb->format->has_alpha || (plane_state->alpha !=
> DRM_BLEND_ALPHA_OPAQUE))
> num_alpha_planes++;
>
> DRM_DEBUG_DRIVER("Plane zpos is %d\n",
> @@ -412,7 +421,8 @@ static int sun4i_backend_atomic_check(struct
> sunxi_engine *engine,
> }
>
> /* We can't have an alpha plane at the lowest position */
> - if (plane_states[0]->fb->format->has_alpha)
> + if (plane_states[0]->fb->format->has_alpha ||
> + (plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE))
> return -EINVAL;
>
> for (i = 1; i < num_planes; i++) {
> @@ -424,7 +434,7 @@ static int sun4i_backend_atomic_check(struct
> sunxi_engine *engine,
> * The only alpha position is the lowest plane of the
> * second pipe.
> */
> - if (fb->format->has_alpha)
> + if (fb->format->has_alpha || (p_state->alpha !=
> DRM_BLEND_ALPHA_OPAQUE))
> current_pipe++;
>
> s_state->pipe = current_pipe;
> diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h
> b/drivers/gpu/drm/sun4i/sun4i_backend.h
> index 52e77591186a..03294d5dd1a2 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_backend.h
> +++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
> @@ -68,11 +68,14 @@
> #define SUN4I_BACKEND_CKMIN_REG 0x884
> #define SUN4I_BACKEND_CKCFG_REG 0x888
> #define SUN4I_BACKEND_ATTCTL_REG0(l) (0x890 + (0x4 *
> (l)))
> +#define SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_MASK GENMASK(31
> , 24)
> +#define SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(x) ((x)
> << 24)
> #define SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK BIT(15)
> #define SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(x) ((x)
> << 15)
> #define SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL_MASK GENMASK(11,
> 10)
> #define SUN4I_BACKEND_ATTCTL_REG0_LAY_PRISEL(x)
> ((x) << 10)
> #define SUN4I_BACKEND_ATTCTL_REG0_LAY_VDOEN BIT(1)
> +#define SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA_EN BIT(0)
>
> #define SUN4I_BACKEND_ATTCTL_REG1(l) (0x8a0 + (0x4 *
> (l)))
> #define SUN4I_BACKEND_ATTCTL_REG1_LAY_HSCAFCT GENMASK(
> 15, 14)
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c
> b/drivers/gpu/drm/sun4i/sun4i_layer.c
> index 33ad377569ec..cf7857b8ac5c 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> @@ -37,6 +37,7 @@ static void sun4i_backend_layer_reset(struct
> drm_plane *plane)
> if (state) {
> plane->state = &state->state;
> plane->state->plane = plane;
> + plane->state->alpha = DRM_BLEND_ALPHA_OPAQUE;
> plane->state->zpos = layer->id;
> }
> }
> @@ -163,6 +164,7 @@ static struct sun4i_layer
> *sun4i_layer_init_one(struct drm_device *drm,
> &sun4i_backend_layer_helper_funcs);
> layer->backend = backend;
>
> + drm_plane_create_alpha_property(&layer->plane);
> drm_plane_create_zpos_property(&layer->plane, 0, 0,
> SUN4I_BACKEND_NUM_LAYERS - 1);
>
--
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
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