drm/msm/dsi: Implement reset correctly

[mirror_ubuntu-bionic-kernel.git] / drivers / gpu / drm / msm / dsi / dsi_host.c

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index a6f211c6481500fc341b295278f8d8260a9bc87a..1e50176e23c84c59fd5c523a5e81a9d40ba9b470 100644 (file)
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -34,6 +34,8 @@
 #include "dsi_cfg.h"
 #include "msm_kms.h"
 
+#define DSI_RESET_TOGGLE_DELAY_MS 20
+
 static int dsi_get_version(const void __iomem *base, u32 *major, u32 *minor)
 {
        u32 ver;
@@ -906,7 +908,7 @@ static void dsi_sw_reset(struct msm_dsi_host *msm_host)
        wmb(); /* clocks need to be enabled before reset */
 
        dsi_write(msm_host, REG_DSI_RESET, 1);
-       wmb(); /* make sure reset happen */
+       msleep(DSI_RESET_TOGGLE_DELAY_MS); /* make sure reset happen */
        dsi_write(msm_host, REG_DSI_RESET, 0);
 }
 
@@ -1288,7 +1290,7 @@ static void dsi_sw_reset_restore(struct msm_dsi_host *msm_host)
 
        /* dsi controller can only be reset while clocks are running */
        dsi_write(msm_host, REG_DSI_RESET, 1);
-       wmb();  /* make sure reset happen */
+       msleep(DSI_RESET_TOGGLE_DELAY_MS); /* make sure reset happen */
        dsi_write(msm_host, REG_DSI_RESET, 0);
        wmb();  /* controller out of reset */
        dsi_write(msm_host, REG_DSI_CTRL, data0);