linux-kernel - [PATCH v3] Fixes: a6b7c98afdca(drm/mediatek: add mtk_dither_set

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Date:   Tue, 20 Jul 2021 13:51:17 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        Fabien Parent <fparent@...libre.com>,
        Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: [PATCH v3] Fixes: a6b7c98afdca(drm/mediatek: add mtk_dither_set_common() function)

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@...iatek.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