This is a note to let you know that I've just added the patch titled
clk: sunxi-ng: a64: Set minimum and maximum rate for PLL-MIPI
to the 6.8-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:
clk-sunxi-ng-a64-set-minimum-and-maximum-rate-for-pll-mipi.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 69f16d9b789821183d342719d2ebd4a5ac7178bc Mon Sep 17 00:00:00 2001
From: Frank Oltmanns <frank@xxxxxxxxxxxx>
Date: Sun, 10 Mar 2024 14:21:12 +0100
Subject: clk: sunxi-ng: a64: Set minimum and maximum rate for PLL-MIPI
From: Frank Oltmanns <frank@xxxxxxxxxxxx>
commit 69f16d9b789821183d342719d2ebd4a5ac7178bc upstream.
When the Allwinner A64's TCON0 searches the ideal rate for the connected
panel, it may happen that it requests a rate from its parent PLL-MIPI
which PLL-MIPI does not support.
This happens for example on the Olimex TERES-I laptop where TCON0
requests PLL-MIPI to change to a rate of several GHz which causes the
panel to stay blank. It also happens on the pinephone where a rate of
less than 500 MHz is requested which causes instabilities on some
phones.
Set the minimum and maximum rate of Allwinner A64's PLL-MIPI according
to the Allwinner User Manual.
Fixes: ca1170b69968 ("clk: sunxi-ng: a64: force select PLL_MIPI in TCON0 mux")
Reported-by: Diego Roversi <diegor@xxxxxxxxxx>
Closes: https://groups.google.com/g/linux-sunxi/c/Rh-Uqqa66bw
Tested-by: Diego Roversi <diegor@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx>
Signed-off-by: Frank Oltmanns <frank@xxxxxxxxxxxx>
Reviewed-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240310-pinephone-pll-fixes-v4-2-46fc80c83637@xxxxxxxxxxxx
Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
+++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c
@@ -182,6 +182,8 @@ static struct ccu_nkm pll_mipi_clk = {
&ccu_nkm_ops,
CLK_SET_RATE_UNGATE | CLK_SET_RATE_PARENT),
.features = CCU_FEATURE_CLOSEST_RATE,
+ .min_rate = 500000000,
+ .max_rate = 1400000000,
},
};
Patches currently in stable-queue which might be from frank@xxxxxxxxxxxx are
queue-6.8/clk-sunxi-ng-common-support-minimum-and-maximum-rate.patch
queue-6.8/clk-sunxi-ng-a64-set-minimum-and-maximum-rate-for-pll-mipi.patch
