This is a note to let you know that I've just added the patch titled
ACPI: CPPC: Fix _CPC register setting issue
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:
acpi-cppc-fix-_cpc-register-setting-issue.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 37b9f2ec608f77931e310c3783a6c1c1561e4aa5
Author: Lifeng Zheng <zhenglifeng1@xxxxxxxxxx>
Date: Wed Nov 13 18:33:09 2024 +0800
ACPI: CPPC: Fix _CPC register setting issue
[ Upstream commit 2388b266c9fcc7c9169ba85c7f9ebe325b7622d7 ]
Since commit 60949b7b8054 ("ACPI: CPPC: Fix MASK_VAL() usage"), _CPC
registers cannot be changed from 1 to 0.
It turns out that there is an extra OR after MASK_VAL_WRITE(), which
has already ORed prev_val with the register mask.
Remove the extra OR to fix the problem.
Fixes: 60949b7b8054 ("ACPI: CPPC: Fix MASK_VAL() usage")
Signed-off-by: Lifeng Zheng <zhenglifeng1@xxxxxxxxxx>
Link: https://patch.msgid.link/20241113103309.761031-1-zhenglifeng1@xxxxxxxxxx
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 0e9ccedb08dab..7ede4a504d272 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1067,7 +1067,6 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
return -EFAULT;
}
val = MASK_VAL_WRITE(reg, prev_val, val);
- val |= prev_val;
}
switch (size) {
