[PATCH v4] drm/mediatek: add dither 6 setting

[Yongqiang Niu <yongqiang.niu@mediatek.com>]

Fixes: a6b7c98afdca(drm/mediatek: add mtk_dither_set_common()
dither 6 setting is missed in a6b7c98afdca
bit 1 is lfsr_en( "Enables LFSR-type dithering"), need enable
bit 2 is rdither_en(Enables running order dithering), need disable

Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 99cbf44..7dd8e05 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -26,6 +26,7 @@
 #define DISP_OD_CFG				0x0020
 #define DISP_OD_SIZE				0x0030
 #define DISP_DITHER_5				0x0114
+#define DISP_DITHER_6				0x0118
 #define DISP_DITHER_7				0x011c
 #define DISP_DITHER_15				0x013c
 #define DISP_DITHER_16				0x0140
@@ -135,6 +136,7 @@ void mtk_dither_set_common(void __iomem *regs, struct cmdq_client_reg *cmdq_reg,
 
 	if (bpc >= MTK_MIN_BPC) {
 		mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_5);
+		mtk_ddp_write(cmdq_pkt, 0x3002, cmdq_reg, regs, DISP_DITHER_6);
 		mtk_ddp_write(cmdq_pkt, 0, cmdq_reg, regs, DISP_DITHER_7);
 		mtk_ddp_write(cmdq_pkt,
 			      DITHER_LSB_ERR_SHIFT_R(MTK_MAX_BPC - bpc) |
-- 
1.8.1.1.dirty