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authorThierry Reding <treding@nvidia.com>2014-12-08 17:05:48 +0300
committerThierry Reding <treding@nvidia.com>2015-01-28 10:45:38 +0300
commit4569619d0f3a38c41a4556c79ef63cabd4282558 (patch)
treed2f4d84b9ef65276160223c8e3025c8e68a6c4f9 /drivers/gpu/drm/panel
parentd435a2af12349e6285559196675ad45f1e4a041d (diff)
downloadlinux-4569619d0f3a38c41a4556c79ef63cabd4282558.tar.xz
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>
Diffstat (limited to 'drivers/gpu/drm/panel')
-rw-r--r--drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c b/drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.c
index 9d81759d82fc..8a11e83ab582 100644
--- 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;
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