[PATCH 3/3] drm/mediatek: add mt8183 dsi driver support

[Jitao Shi]

MT8183 dsi has two changes with mt8173.
1. Add the register double buffer control, but we no need it, So make
   it default off.
2. Add picture size control.

Signed-off-by: Jitao Shi <jitao....@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c 
b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 80db02a25cb0..20cb53f05d42 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -78,6 +78,7 @@
 #define DSI_VBP_NL             0x24
 #define DSI_VFP_NL             0x28
 #define DSI_VACT_NL            0x2C
+#define DSI_SIZE_CON           0x38
 #define DSI_HSA_WC             0x50
 #define DSI_HBP_WC             0x54
 #define DSI_HFP_WC             0x58
@@ -131,7 +132,10 @@
 #define VM_CMD_EN                      BIT(0)
 #define TS_VFP_EN                      BIT(5)
 
-#define DSI_CMDQ0              0x180
+#define DSI_SHADOW_DEBUG       0x190U
+#define FORCE_COMMIT           BIT(0)
+#define BYPASS_SHADOW          BIT(1)
+
 #define CONFIG                         (0xff << 0)
 #define SHORT_PACKET                   0
 #define LONG_PACKET                    2
@@ -158,6 +162,7 @@ struct phy;
 
 struct mtk_dsi_driver_data {
        const u32 reg_cmdq_off;
+       bool has_size_ctl;
 };
 
 struct mtk_dsi {
@@ -426,6 +431,9 @@ static void mtk_dsi_config_vdo_timing(struct mtk_dsi *dsi)
        writel(vm->vfront_porch, dsi->regs + DSI_VFP_NL);
        writel(vm->vactive, dsi->regs + DSI_VACT_NL);
 
+       if (dsi->driver_data->has_size_ctl)
+               writel(vm->vactive << 16 | vm->hactive, dsi->regs + 
DSI_SIZE_CON);
+
        horizontal_sync_active_byte = (vm->hsync_len * dsi_tmp_buf_bpp - 10);
 
        if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
@@ -595,6 +603,9 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
        }
 
        mtk_dsi_enable(dsi);
+
+       /* DSI no need this double buffer, disable it when writing register */
+       writel(FORCE_COMMIT | BYPASS_SHADOW, dsi->regs + DSI_SHADOW_DEBUG);
        mtk_dsi_reset_engine(dsi);
        mtk_dsi_phy_timconfig(dsi);
 
@@ -1090,11 +1101,18 @@ static const struct mtk_dsi_driver_data 
mt2701_dsi_driver_data = {
        .reg_cmdq_off = 0x180,
 };
 
+static const struct mtk_dsi_driver_data mt8183_dsi_driver_data = {
+       .reg_cmdq_off = 0x200,
+       .has_size_ctl = true,
+};
+
 static const struct of_device_id mtk_dsi_of_match[] = {
        { .compatible = "mediatek,mt2701-dsi",
          .data = &mt2701_dsi_driver_data },
        { .compatible = "mediatek,mt8173-dsi",
          .data = &mt8173_dsi_driver_data },
+       { .compatible = "mediatek,mt8183-dsi",
+         .data = &mt8183_dsi_driver_data },
        { },
 };
 
-- 
2.20.1