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SubjectRe: [PATCH v2 2/2] drm/mali-dp: Implement plane alpha and pixel blend on malidp
Hi Lowry,

On Wed, May 30, 2018 at 07:23:54PM +0800, Lowry Li wrote:
>Check the pixel blending mode and plane alpha value when
>do the plane_check. Mali DP supports blending the current plane
>with the background either based on the pixel alpha blending
>mode or by using the layer's alpha value, but not both at the
>same time. If both case, plane_check will return failed.
>
>Set the HW when doing plane_update accordingly. If plane alpha
>is the 0xffff, set the PREM bit accordingly. If not we'd set
>ALPHA bit as zero and layer alpha value.

The code looks correct - but the description of the PREM bit seems
wrong here. Did you mean "set the pixel blending bits accordingly"?

With that fixed:

Reviewed-by: Brian Starkey <brian.starkey@arm.com>

>
>Signed-off-by: Lowry Li <lowry.li@arm.com>
>---
> drivers/gpu/drm/arm/malidp_planes.c | 76 +++++++++++++++++++++----------------
> 1 file changed, 44 insertions(+), 32 deletions(-)
>
>diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
>index 7a44897..daa3f4f 100644
>--- a/drivers/gpu/drm/arm/malidp_planes.c
>+++ b/drivers/gpu/drm/arm/malidp_planes.c
>@@ -35,6 +35,7 @@
> #define LAYER_COMP_MASK (0x3 << 12)
> #define LAYER_COMP_PIXEL (0x3 << 12)
> #define LAYER_COMP_PLANE (0x2 << 12)
>+#define LAYER_PMUL_ENABLE (0x1 << 14)
> #define LAYER_ALPHA_OFFSET (16)
> #define LAYER_ALPHA_MASK (0xff)
> #define LAYER_ALPHA(x) (((x) & LAYER_ALPHA_MASK) << LAYER_ALPHA_OFFSET)
>@@ -182,6 +183,7 @@ static int malidp_de_plane_check(struct drm_plane *plane,
> struct malidp_plane_state *ms = to_malidp_plane_state(state);
> bool rotated = state->rotation & MALIDP_ROTATED_MASK;
> struct drm_framebuffer *fb;
>+ u16 pixel_alpha = state->pixel_blend_mode;
> int i, ret;
>
> if (!state->crtc || !state->fb)
>@@ -244,6 +246,11 @@ static int malidp_de_plane_check(struct drm_plane *plane,
> ms->rotmem_size = val;
> }
>
>+ /* HW can't support plane + pixel blending */
>+ if ((state->alpha != DRM_BLEND_ALPHA_OPAQUE) &&
>+ (pixel_alpha != DRM_MODE_BLEND_PIXEL_NONE))
>+ return -EINVAL;
>+
> return 0;
> }
>
>@@ -325,31 +332,33 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> {
> struct malidp_plane *mp;
> struct malidp_plane_state *ms = to_malidp_plane_state(plane->state);
>+ struct drm_plane_state *state = plane->state;
>+ u16 pixel_alpha = state->pixel_blend_mode;
>+ u8 plane_alpha = state->alpha >> 8;
> u32 src_w, src_h, dest_w, dest_h, val;
> int i;
>- bool format_has_alpha = plane->state->fb->format->has_alpha;
>
> mp = to_malidp_plane(plane);
>
> /* convert src values from Q16 fixed point to integer */
>- src_w = plane->state->src_w >> 16;
>- src_h = plane->state->src_h >> 16;
>- dest_w = plane->state->crtc_w;
>- dest_h = plane->state->crtc_h;
>+ src_w = state->src_w >> 16;
>+ src_h = state->src_h >> 16;
>+ dest_w = state->crtc_w;
>+ dest_h = state->crtc_h;
>
> malidp_hw_write(mp->hwdev, ms->format, mp->layer->base);
>
> for (i = 0; i < ms->n_planes; i++) {
> /* calculate the offset for the layer's plane registers */
> u16 ptr = mp->layer->ptr + (i << 4);
>- dma_addr_t fb_addr = drm_fb_cma_get_gem_addr(plane->state->fb,
>- plane->state, i);
>+ dma_addr_t fb_addr = drm_fb_cma_get_gem_addr(state->fb,
>+ state, i);
>
> malidp_hw_write(mp->hwdev, lower_32_bits(fb_addr), ptr);
> malidp_hw_write(mp->hwdev, upper_32_bits(fb_addr), ptr + 4);
> }
> malidp_de_set_plane_pitches(mp, ms->n_planes,
>- plane->state->fb->pitches);
>+ state->fb->pitches);
>
> if ((plane->state->color_encoding != old_state->color_encoding) ||
> (plane->state->color_range != old_state->color_range))
>@@ -362,8 +371,8 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> malidp_hw_write(mp->hwdev, LAYER_H_VAL(dest_w) | LAYER_V_VAL(dest_h),
> mp->layer->base + MALIDP_LAYER_COMP_SIZE);
>
>- malidp_hw_write(mp->hwdev, LAYER_H_VAL(plane->state->crtc_x) |
>- LAYER_V_VAL(plane->state->crtc_y),
>+ malidp_hw_write(mp->hwdev, LAYER_H_VAL(state->crtc_x) |
>+ LAYER_V_VAL(state->crtc_y),
> mp->layer->base + MALIDP_LAYER_OFFSET);
>
> if (mp->layer->id == DE_SMART)
>@@ -376,38 +385,35 @@ static void malidp_de_plane_update(struct drm_plane *plane,
> val &= ~LAYER_ROT_MASK;
>
> /* setup the rotation and axis flip bits */
>- if (plane->state->rotation & DRM_MODE_ROTATE_MASK)
>+ if (state->rotation & DRM_MODE_ROTATE_MASK)
> val |= ilog2(plane->state->rotation & DRM_MODE_ROTATE_MASK) <<
> LAYER_ROT_OFFSET;
>- if (plane->state->rotation & DRM_MODE_REFLECT_X)
>+ if (state->rotation & DRM_MODE_REFLECT_X)
> val |= LAYER_H_FLIP;
>- if (plane->state->rotation & DRM_MODE_REFLECT_Y)
>+ if (state->rotation & DRM_MODE_REFLECT_Y)
> val |= LAYER_V_FLIP;
>
>- val &= ~LAYER_COMP_MASK;
>- if (format_has_alpha) {
>-
>- /*
>- * always enable pixel alpha blending until we have a way
>- * to change blend modes
>- */
>- val |= LAYER_COMP_PIXEL;
>- } else {
>-
>- /*
>- * do not enable pixel alpha blending as the color channel
>- * does not have any alpha information
>- */
>- val |= LAYER_COMP_PLANE;
>-
>- /* Set layer alpha coefficient to 0xff ie fully opaque */
>+ val &= ~(LAYER_COMP_MASK | LAYER_PMUL_ENABLE);
>+
>+ if (state->alpha != DRM_BLEND_ALPHA_OPAQUE) {
>+ val |= LAYER_COMP_PLANE | LAYER_ALPHA(plane_alpha);
>+ } else if (state->fb->format->has_alpha) {
>+ /* We only care about blend mode if the format has alpha */
>+ switch (pixel_alpha) {
>+ case DRM_MODE_BLEND_PREMULTI:
>+ val |= LAYER_COMP_PIXEL | LAYER_PMUL_ENABLE;
>+ break;
>+ case DRM_MODE_BLEND_COVERAGE:
>+ val |= LAYER_COMP_PIXEL;
>+ break;
>+ }
> val |= LAYER_ALPHA(0xff);
> }
>
> val &= ~LAYER_FLOWCFG(LAYER_FLOWCFG_MASK);
>- if (plane->state->crtc) {
>+ if (state->crtc) {
> struct malidp_crtc_state *m =
>- to_malidp_crtc_state(plane->state->crtc->state);
>+ to_malidp_crtc_state(state->crtc->state);
>
> if (m->scaler_config.scale_enable &&
> m->scaler_config.plane_src_id == mp->layer->id)
>@@ -446,6 +452,9 @@ int malidp_de_planes_init(struct drm_device *drm)
> unsigned long crtcs = 1 << drm->mode_config.num_crtc;
> unsigned long flags = DRM_MODE_ROTATE_0 | DRM_MODE_ROTATE_90 | DRM_MODE_ROTATE_180 |
> DRM_MODE_ROTATE_270 | DRM_MODE_REFLECT_X | DRM_MODE_REFLECT_Y;
>+ unsigned int blend_caps = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
>+ BIT(DRM_MODE_BLEND_PREMULTI) |
>+ BIT(DRM_MODE_BLEND_COVERAGE);
> u32 *formats;
> int ret, i, j, n;
>
>@@ -498,6 +507,9 @@ int malidp_de_planes_init(struct drm_device *drm)
> malidp_hw_write(malidp->dev, MALIDP_ALPHA_LUT,
> plane->layer->base + MALIDP_LAYER_COMPOSE);
>
>+ drm_plane_create_alpha_property(&plane->base);
>+ drm_plane_create_blend_mode_property(&plane->base, blend_caps);
>+
> /* Attach the YUV->RGB property only to video layers */
> if (id & (DE_VIDEO1 | DE_VIDEO2)) {
> /* default encoding for YUV->RGB is BT601 NARROW */
>--
>1.9.1
>

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