drm/panel: sharp: lq101r1sx01: Add delay after display on

After switching the display on (using the DCS display_on command), wait
for 6 frames (100ms at 60 Hz) to give the display more time to prepare.
Failing to do this results in the panel not initializing properly in a
large number of cases.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
index 9d81759..8a11e83 100644 (file)
--- a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
@@ -41,6 +41,16 @@ static inline struct sharp_panel *to_sharp_panel(struct drm_panel *panel)
        return container_of(panel, struct sharp_panel, base);
 }
 
+static void sharp_wait_frames(struct sharp_panel *sharp, unsigned int frames)
+{
+       unsigned int refresh = drm_mode_vrefresh(sharp->mode);
+
+       if (WARN_ON(frames > refresh))
+               return;
+
+       msleep(1000 / (refresh / frames));
+}
+
 static int sharp_panel_write(struct sharp_panel *sharp, u16 offset, u8 value)
 {
        u8 payload[3] = { offset >> 8, offset & 0xff, value };
@@ -238,6 +248,9 @@ static int sharp_panel_prepare(struct drm_panel *panel)
 
        sharp->prepared = true;
 
+       /* wait for 6 frames before continuing */
+       sharp_wait_frames(sharp, 6);
+
        return 0;
 
 poweroff: