drm/rockchip: dsi: support EoTp feature

In order to enhance the overall robustness of the system, DSI defines
a dedicated EoT packet (EoTp) at the protocol layer for signaling
the end of HS transmission. For backwards compatibility with earlier
DSI systems, the capability of generating and interpreting this EoTp
can be enabled or disabled.

Change-Id: Iddc7e82a7e3e47dea94846fbb771da8fddc0fda3
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>

Author: bivvy

drivers/gpu/drm/rockchip/dw-mipi-dsi.c

@@ -74,11 +74,11 @@
 #define DSI_DBI_CMDSIZE			0x28
 
 #define DSI_PCKHDL_CFG			0x2c
-#define EN_CRC_RX			BIT(4)
-#define EN_ECC_RX			BIT(3)
-#define EN_BTA				BIT(2)
-#define EN_EOTP_RX			BIT(1)
-#define EN_EOTP_TX			BIT(0)
+#define CRC_RX_EN			BIT(4)
+#define ECC_RX_EN			BIT(3)
+#define BTA_EN				BIT(2)
+#define EOTP_RX_EN			BIT(1)
+#define EOTP_TX_EN			BIT(0)
 
 #define DSI_MODE_CFG			0x34
 #define ENABLE_VIDEO_MODE		0
@@ -1082,8 +1082,12 @@ static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
 
 static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
 {
-	regmap_write(dsi->regmap, DSI_PCKHDL_CFG,
-		     EN_CRC_RX | EN_ECC_RX | EN_BTA);
+	u32 val = CRC_RX_EN | ECC_RX_EN | BTA_EN | EOTP_TX_EN;
+
+	if (dsi->mode_flags & MIPI_DSI_MODE_EOT_PACKET)
+		val &= ~EOTP_TX_EN;
+
+	regmap_write(dsi->regmap, DSI_PCKHDL_CFG, val);
 }
 
 static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,