[PATCH v7 09/18] drm/mediatek: Support constant blending in OVL

[Shawn Sung]

From: Hsiao Chien Sung <shawn.s...@mediatek.com>

Support constant alpha blending in OVL.

Signed-off-by: Hsiao Chien Sung <shawn.s...@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c 
b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
index 738244a6164e8..e41fd83e36e79 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
@@ -38,6 +38,7 @@
 #define DISP_REG_OVL_PITCH_MSB(n)              (0x0040 + 0x20 * (n))
 #define OVL_PITCH_MSB_2ND_SUBBUF                       BIT(16)
 #define DISP_REG_OVL_PITCH(n)                  (0x0044 + 0x20 * (n))
+#define OVL_CONST_BLEND                                        BIT(28)
 #define DISP_REG_OVL_RDMA_CTRL(n)              (0x00c0 + 0x20 * (n))
 #define DISP_REG_OVL_RDMA_GMC(n)               (0x00c8 + 0x20 * (n))
 #define DISP_REG_OVL_ADDR_MT2701               0x0040
@@ -428,6 +429,7 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int 
idx,
        unsigned int fmt = pending->format;
        unsigned int offset = (pending->y << 16) | pending->x;
        unsigned int src_size = (pending->height << 16) | pending->width;
+       unsigned int ignore_pixel_alpha = 0;
        unsigned int con;
        bool is_afbc = pending->modifier != DRM_FORMAT_MOD_LINEAR;
        union overlay_pitch {
@@ -449,6 +451,9 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int 
idx,
        if (state->base.fb && state->base.fb->format->has_alpha)
                con |= OVL_CON_AEN | OVL_CON_ALPHA;
 
+       if (state->base.fb && !state->base.fb->format->has_alpha)
+               ignore_pixel_alpha = OVL_CONST_BLEND;
+
        if (pending->rotation & DRM_MODE_REFLECT_Y) {
                con |= OVL_CON_VIRT_FLIP;
                addr += (pending->height - 1) * pending->pitch;
@@ -464,8 +469,8 @@ void mtk_ovl_layer_config(struct device *dev, unsigned int 
idx,
 
        mtk_ddp_write_relaxed(cmdq_pkt, con, &ovl->cmdq_reg, ovl->regs,
                              DISP_REG_OVL_CON(idx));
-       mtk_ddp_write_relaxed(cmdq_pkt, overlay_pitch.split_pitch.lsb, 
&ovl->cmdq_reg, ovl->regs,
-                             DISP_REG_OVL_PITCH(idx));
+       mtk_ddp_write_relaxed(cmdq_pkt, overlay_pitch.split_pitch.lsb | 
ignore_pixel_alpha,
+                             &ovl->cmdq_reg, ovl->regs, 
DISP_REG_OVL_PITCH(idx));
        mtk_ddp_write_relaxed(cmdq_pkt, src_size, &ovl->cmdq_reg, ovl->regs,
                              DISP_REG_OVL_SRC_SIZE(idx));
        mtk_ddp_write_relaxed(cmdq_pkt, offset, &ovl->cmdq_reg, ovl->regs,
-- 
2.18.0