drm/rockchip: dw-mipi-dsi: ensure PHY is reset

Also don't power up the DSI host at this point since this is not
necessary in order to configure the PHY and we do so later when
selecting video or command mode.
Signed-off-by: NJohn Keeping <john@metanate.com>
Reviewed-by: NChris Zhong <zyw@rock-chips.com>
Reviewed-by: NSean Paul <seanpaul@chromium.org>
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170224125506.21533-15-john@metanate.com

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

@@ -397,7 +397,10 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 		return testdin;
 	}
 
-	dsi_write(dsi, DSI_PWR_UP, POWERUP);
+	/* Start by clearing PHY state */
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
+	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
 
 	dw_mipi_dsi_phy_write(dsi, 0x10, BYPASS_VCO_RANGE |
 					 VCO_RANGE_CON_SEL(vco) |