linux-kernel - [PATCH v1 17/21] drm/mediatek: add rdma bypass shadow register function

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Date:   Thu, 20 Aug 2020 14:04:14 +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 17/21] drm/mediatek: add rdma bypass shadow register function

add rdma bypass shadow register function

Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
index 0683bef..91ed6c6 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -46,12 +46,16 @@
 #define RDMA_FIFO_PSEUDO_SIZE(bytes)			(((bytes) / 16) << 16)
 #define RDMA_OUTPUT_VALID_FIFO_THRESHOLD(bytes)		((bytes) / 16)
 #define RDMA_FIFO_SIZE(rdma)			((rdma)->data->fifo_size)
+#define DISP_REG_RDMA_SHADOW_UPDATE		0x00bc
+#define DISP_RDMA_BYPASS_SHADOW				BIT(1)
+#define DISP_RDMA_READ_WORK_REG				BIT(2)
 #define DISP_RDMA_MEM_START_ADDR		0x0f00
 
 #define RDMA_MEM_GMC				0x40402020
 
 struct mtk_disp_rdma_data {
 	unsigned int fifo_size;
+	bool has_shadow;
 };
 
 /**
@@ -125,6 +129,21 @@ static void mtk_rdma_stop(struct mtk_ddp_comp *comp)
 	rdma_update_bits(comp, DISP_REG_RDMA_GLOBAL_CON, RDMA_ENGINE_EN, 0);
 }
 
+static void mtk_rdma_bypass_shadow(struct mtk_ddp_comp *comp)
+{
+	struct mtk_disp_rdma *rdma = comp_to_rdma(comp);
+
+	if (rdma->data->has_shadow) {
+		pr_err("disable rdma shadow\n");
+		mtk_ddp_write_mask(NULL, DISP_RDMA_BYPASS_SHADOW, comp,
+				   DISP_REG_RDMA_SHADOW_UPDATE,
+				   DISP_RDMA_BYPASS_SHADOW);
+		mtk_ddp_write_mask(NULL, DISP_RDMA_READ_WORK_REG, comp,
+				   DISP_REG_RDMA_SHADOW_UPDATE,
+				   DISP_RDMA_READ_WORK_REG);
+	}
+}
+
 static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
 			    unsigned int height, unsigned int vrefresh,
 			    unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
@@ -238,6 +257,7 @@ static void mtk_rdma_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
 	.config = mtk_rdma_config,
 	.start = mtk_rdma_start,
 	.stop = mtk_rdma_stop,
+	.bypass_shadow = mtk_rdma_bypass_shadow,
 	.enable_vblank = mtk_rdma_enable_vblank,
 	.disable_vblank = mtk_rdma_disable_vblank,
 	.layer_nr = mtk_rdma_layer_nr,
-- 
1.8.1.1.dirty