for 5 or 6 bpc panel, we need enable dither function to improve the display quality
Signed-off-by: Yongqiang Niu yongqiang.niu@mediatek.com --- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 38 ++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c index 03589c9..81ed076 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -53,7 +53,9 @@ #define DITHER_EN BIT(0) #define DISP_DITHER_CFG 0x0020 #define DITHER_RELAY_MODE BIT(0) +#define DITHER_ENGINE_EN BIT(1) #define DISP_DITHER_SIZE 0x0030 +#define DITHER_REG(idx) (0x100 + (idx) * 4)
#define LUT_10BIT_MASK 0x03ff
@@ -258,8 +260,42 @@ static void mtk_dither_config(struct mtk_ddp_comp *comp, unsigned int w, unsigned int h, unsigned int vrefresh, unsigned int bpc, struct cmdq_pkt *cmdq_pkt) { + bool enable = true; + + const u32 dither_setting[] = { + 0x00000000, /* 5 */ + 0x00003002, /* 6 */ + 0x00000000, /* 7 */ + 0x00000000, /* 8 */ + 0x00000000, /* 9 */ + 0x00000000, /* 10 */ + 0x00000000, /* 11 */ + 0x00000011, /* 12 */ + 0x00000000, /* 13 */ + 0x00000000, /* 14 */ + }; + + if (bpc == 6) { + mtk_ddp_write(cmdq_pkt, 0x40400001, comp, DITHER_REG(15)); + mtk_ddp_write(cmdq_pkt, 0x40404040, comp, DITHER_REG(16)); + } else if (bpc == 5) { + mtk_ddp_write(cmdq_pkt, 0x50500001, comp, DITHER_REG(15)); + mtk_ddp_write(cmdq_pkt, 0x50504040, comp, DITHER_REG(16)); + } else { + enable = false; + } + + if (enable) { + u32 idx; + + for (idx = 0; idx < ARRAY_SIZE(dither_setting); idx++) + mtk_ddp_write(cmdq_pkt, dither_setting[idx], comp, + DITHER_REG(idx + 5)); + } + mtk_ddp_write(cmdq_pkt, h << 16 | w, comp, DISP_DITHER_SIZE); - mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, comp, DISP_DITHER_CFG); + mtk_ddp_write(cmdq_pkt, enable ? DITHER_ENGINE_EN : DITHER_RELAY_MODE, + comp, DISP_DITHER_CFG); }
static void mtk_dither_start(struct mtk_ddp_comp *comp)