linux-kernel - [PATCH v1 18/21] drm/mediatek: add dither bypass shadow register function

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Date:   Thu, 20 Aug 2020 14:04:15 +0800
From:   Yongqiang Niu <yongqiang.niu@...iatek.com>
To:     CK Hu <ck.hu@...iatek.com>, Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>
Subject: [PATCH v1 18/21] drm/mediatek: add dither bypass shadow register function

add dither bypass shadow register function

Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 0c81253..315bd3a 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -23,6 +23,9 @@
 #define DISP_OD_INTSTA				0x000c
 #define DISP_OD_CFG				0x0020
 #define DISP_OD_SIZE				0x0030
+
+#define DITHER_REG(idx)				(0x100 + (idx) * 4)
+#define DITHER_BYPASS_SHADOW				BIT(0)
 #define DISP_DITHER_5				0x0114
 #define DISP_DITHER_7				0x011c
 #define DISP_DITHER_15				0x013c
@@ -291,6 +294,13 @@ static void mtk_dither_stop(struct mtk_ddp_comp *comp)
 	writel_relaxed(0x0, comp->regs + DISP_DITHER_EN);
 }
 
+static void mtk_dither_bypass_shadow(struct mtk_ddp_comp *comp)
+{
+	mtk_ddp_write_mask(NULL, DITHER_BYPASS_SHADOW, comp,
+			   DITHER_REG(0),
+			   DITHER_BYPASS_SHADOW);
+}
+
 static void mtk_gamma_config(struct mtk_ddp_comp *comp, unsigned int w,
 			     unsigned int h, unsigned int vrefresh,
 			     unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
@@ -368,6 +378,7 @@ static void mtk_postmask_stop(struct mtk_ddp_comp *comp)
 	.config = mtk_dither_config,
 	.start = mtk_dither_start,
 	.stop = mtk_dither_stop,
+	.bypass_shadow = mtk_dither_bypass_shadow,
 };
 
 static const struct mtk_ddp_comp_funcs ddp_gamma = {
-- 
1.8.1.1.dirty