This is a note to let you know that I've just added the patch titled
drm/bridge: lt9611: Fix PLL being unable to lock
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-pll-being-unable-to-lock.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.
>From 2a9df204be0bbb896e087f00b9ee3fc559d5a608 Mon Sep 17 00:00:00 2001
From: Robert Foss <robert.foss@xxxxxxxxxx>
Date: Tue, 13 Dec 2022 16:03:04 +0100
Subject: drm/bridge: lt9611: Fix PLL being unable to lock
From: Robert Foss <robert.foss@xxxxxxxxxx>
commit 2a9df204be0bbb896e087f00b9ee3fc559d5a608 upstream.
This fixes PLL being unable to lock, and is derived from an equivalent
downstream commit.
Available LT9611 documentation does not list this register, neither does
LT9611UXC (which is a different chip).
This commit has been confirmed to fix HDMI output on DragonBoard 845c.
Suggested-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Reviewed-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Robert Foss <robert.foss@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20221213150304.4189760-1-robert.foss@xxxxxxxxxx
Signed-off-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/lontium-lt9611.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -256,6 +256,7 @@ static int lt9611_pll_setup(struct lt961
{ 0x8126, 0x55 },
{ 0x8127, 0x66 },
{ 0x8128, 0x88 },
+ { 0x812a, 0x20 },
};
regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
Patches currently in stable-queue which might be from robert.foss@xxxxxxxxxx are
queue-5.15/drm-bridge-lt9611-fix-pll-being-unable-to-lock.patch
