This is a note to let you know that I've just added the patch titled
soc/tegra: regulators: Fix locking up when voltage-spread is out of range
to the 5.12-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:
soc-tegra-regulators-fix-locking-up-when-voltage-spread-is-out-of-range.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ef85bb582c41524e9e68dfdbde48e519dac4ab3d Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <digetx@xxxxxxxxx>
Date: Tue, 2 Mar 2021 16:18:00 +0300
Subject: soc/tegra: regulators: Fix locking up when voltage-spread is out of range
From: Dmitry Osipenko <digetx@xxxxxxxxx>
commit ef85bb582c41524e9e68dfdbde48e519dac4ab3d upstream.
Fix voltage coupler lockup which happens when voltage-spread is out
of range due to a bug in the code. The max-spread requirement shall be
accounted when CPU regulator doesn't have consumers. This problem is
observed on Tegra30 Ouya game console once system-wide DVFS is enabled
in a device-tree.
Fixes: 783807436f36 ("soc/tegra: regulators: Add regulators coupler for Tegra30")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Peter Geis <pgwipeout@xxxxxxxxx>
Tested-by: Peter Geis <pgwipeout@xxxxxxxxx> # Ouya T30
Tested-by: Matt Merhar <mattmerhar@xxxxxxxxxxxxxx> # Ouya T30
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/soc/tegra/regulators-tegra30.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/soc/tegra/regulators-tegra30.c
+++ b/drivers/soc/tegra/regulators-tegra30.c
@@ -178,7 +178,7 @@ static int tegra30_voltage_update(struct
* survive the voltage drop if it's running on a higher frequency.
*/
if (!cpu_min_uV_consumers)
- cpu_min_uV = cpu_uV;
+ cpu_min_uV = max(cpu_uV, cpu_min_uV);
/*
* Bootloader shall set up voltages correctly, but if it
Patches currently in stable-queue which might be from digetx@xxxxxxxxx are
queue-5.12/soc-tegra-regulators-fix-locking-up-when-voltage-spread-is-out-of-range.patch
