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
--- a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
@@ -41,6 +41,16 @@
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 @@
sharp->prepared = true;
+ /* wait for 6 frames before continuing */
+ sharp_wait_frames(sharp, 6);
+
return 0;
poweroff: