[PATCH v7 9/9] drm/mediatek: add dphy reset after setting lanes number

[Jitao Shi]

Add dphy reset after setting lanes number to avoid dphy fifo effor.

Signed-off-by: Jitao Shi <jitao.shi at mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index b02373b04848..8c2620ea18d0 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -37,6 +37,7 @@
 #define DSI_CON_CTRL		0x10
 #define DSI_RESET			BIT(0)
 #define DSI_EN				BIT(1)
+#define DPHY_RESET			BIT(2)
 
 #define DSI_MODE_CTRL		0x14
 #define MODE				(3)
@@ -280,6 +281,12 @@ static void mtk_dsi_reset_engine(struct mtk_dsi *dsi)
 	mtk_dsi_mask(dsi, DSI_CON_CTRL, DSI_RESET, 0);
 }
 
+static void mtk_dsi_reset_dphy(struct mtk_dsi *dsi)
+{
+	mtk_dsi_mask(dsi, DSI_CON_CTRL, DPHY_RESET, DPHY_RESET);
+	mtk_dsi_mask(dsi, DSI_CON_CTRL, DPHY_RESET, 0);
+}
+
 static void mtk_dsi_clk_ulp_mode_enter(struct mtk_dsi *dsi)
 {
 	mtk_dsi_mask(dsi, DSI_PHY_LCCON, LC_HS_TX_EN, 0);
@@ -650,6 +657,8 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 	mtk_dsi_phy_timconfig(dsi);
 
 	mtk_dsi_rxtx_control(dsi);
+	usleep_range(30, 100);
+	mtk_dsi_reset_dphy(dsi);
 	mtk_dsi_ps_control_vact(dsi);
 	mtk_dsi_set_vm_cmd(dsi);
 	mtk_dsi_config_vdo_timing(dsi);
-- 
2.21.0