This is a note to let you know that I've just added the patch titled
drm/bridge: lt9611: fix sleep mode setup
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-lt9611-fix-sleep-mode-setup.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fbbce77689393670c504cc5388b228935ee5e518
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Wed Jan 18 10:16:46 2023 +0200
drm/bridge: lt9611: fix sleep mode setup
[ Upstream commit ae2d329f104b75a0a78dcaded29fe6283289cdf9 ]
On atomic_post_disable the bridge goes to the low power state. However
the code disables too much of the chip, so the HPD event is not being
detected and delivered to the host. Reduce the power saving in order to
get the HPD event.
Fixes: 23278bf54afe ("drm/bridge: Introduce LT9611 DSI to HDMI bridge")
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-2-dmitry.baryshkov@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index 1dcc28a4d8537..5e5641ac5ea3d 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -446,12 +446,11 @@ static void lt9611_sleep_setup(struct lt9611 *lt9611)
{ 0x8023, 0x01 },
{ 0x8157, 0x03 }, /* set addr pin as output */
{ 0x8149, 0x0b },
- { 0x8151, 0x30 }, /* disable IRQ */
+
{ 0x8102, 0x48 }, /* MIPI Rx power down */
{ 0x8123, 0x80 },
{ 0x8130, 0x00 },
- { 0x8100, 0x01 }, /* bandgap power down */
- { 0x8101, 0x00 }, /* system clk power down */
+ { 0x8011, 0x0a },
};
regmap_multi_reg_write(lt9611->regmap,
