linux-kernel - [PATCH v6,2/3] drm: mediatek: Adjust the dpi output format to MT8186

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Date:   Wed, 14 Sep 2022 21:21:01 +0800
From:   <xinlei.lee@...iatek.com>
To:     <matthias.bgg@...il.com>, <jason-jh.lin@...iatek.com>,
        <rex-bc.chen@...iatek.com>,
        <angelogioacchino.delregno@...labora.com>, <ck.hu@...iatek.com>,
        <p.zabel@...gutronix.de>, <airlied@...ux.ie>, <daniel@...ll.ch>
CC:     <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <jitao.shi@...iatek.com>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Xinlei Lee <xinlei.lee@...iatek.com>
Subject: [PATCH v6,2/3] drm: mediatek: Adjust the dpi output format to MT8186

From: Xinlei Lee <xinlei.lee@...iatek.com>

Dpi output needs to adjust the output format to dual edge for MT8186.
The bridge ic on MT8186 uses the output format of RGB888_dual_edge. Due
to hardware changes, we need to modify the output format corresponding
to the mmsys register.

Co-developed-by: Jitao Shi <jitao.shi@...iatek.com>
Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
Signed-off-by: Xinlei Lee <xinlei.lee@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Nís F. R. A. Prado <nfraprado@...labora.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index fb0b79704636..6e02f02f163c 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -14,6 +14,7 @@
 #include <linux/of_graph.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
+#include <linux/soc/mediatek/mtk-mmsys.h>
 #include <linux/types.h>
 
 #include <video/videomode.h>
@@ -28,6 +29,7 @@
 #include "mtk_disp_drv.h"
 #include "mtk_dpi_regs.h"
 #include "mtk_drm_ddp_comp.h"
+#include "mtk_drm_drv.h"
 
 enum mtk_dpi_out_bit_num {
 	MTK_DPI_OUT_BIT_NUM_8BITS,
@@ -58,6 +60,11 @@ enum mtk_dpi_out_color_format {
 	MTK_DPI_COLOR_FORMAT_YCBCR_422
 };
 
+enum mtk_dpi_out_format_con {
+	MTK_DPI_RGB888_DDR_CON,
+	MTK_DPI_RGB565_SDR_CON
+};
+
 struct mtk_dpi {
 	struct drm_encoder encoder;
 	struct drm_bridge bridge;
@@ -80,6 +87,7 @@ struct mtk_dpi {
 	struct pinctrl_state *pins_dpi;
 	u32 output_fmt;
 	int refcount;
+	struct device *mmsys_dev;
 };
 
 static inline struct mtk_dpi *bridge_to_dpi(struct drm_bridge *b)
@@ -133,6 +141,7 @@ struct mtk_dpi_yc_limit {
  * @yuv422_en_bit: Enable bit of yuv422.
  * @csc_enable_bit: Enable bit of CSC.
  * @pixels_per_iter: Quantity of transferred pixels per iteration.
+ * @edge_cfg_in_mmsys: If the edge configuration for DPI's output needs to be set in MMSYS.
  */
 struct mtk_dpi_conf {
 	unsigned int (*cal_factor)(int clock);
@@ -151,6 +160,7 @@ struct mtk_dpi_conf {
 	u32 yuv422_en_bit;
 	u32 csc_enable_bit;
 	u32 pixels_per_iter;
+	bool edge_cfg_in_mmsys;
 };
 
 static void mtk_dpi_mask(struct mtk_dpi *dpi, u32 offset, u32 val, u32 mask)
@@ -447,6 +457,8 @@ static void mtk_dpi_dual_edge(struct mtk_dpi *dpi)
 		mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING,
 			     dpi->output_fmt == MEDIA_BUS_FMT_RGB888_2X12_LE ?
 			     EDGE_SEL : 0, EDGE_SEL);
+		if (dpi->conf->edge_cfg_in_mmsys)
+			mtk_mmsys_ddp_dpi_fmt_config(dpi->mmsys_dev, MTK_DPI_RGB888_DDR_CON);
 	} else {
 		mtk_dpi_mask(dpi, DPI_DDR_SETTING, DDR_EN | DDR_4PHASE, 0);
 	}
@@ -776,8 +788,10 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
 {
 	struct mtk_dpi *dpi = dev_get_drvdata(dev);
 	struct drm_device *drm_dev = data;
+	struct mtk_drm_private *priv = drm_dev->dev_private;
 	int ret;
 
+	dpi->mmsys_dev = priv->mmsys_dev;
 	ret = drm_simple_encoder_init(drm_dev, &dpi->encoder,
 				      DRM_MODE_ENCODER_TMDS);
 	if (ret) {
-- 
2.18.0