* [PATCH v2] misc: amd-sbi: Address CPUID extended function bits
@ 2026-03-18 13:44 Akshay Gupta
0 siblings, 0 replies; only message in thread
From: Akshay Gupta @ 2026-03-18 13:44 UTC (permalink / raw)
To: linux-kernel
Cc: gregkh, arnd, linux, naveenkrishna.chatradhi, Anand.Umarji,
Akshay Gupta, stable, Prathima L K
According to the UAPI header (amd-apml.h), the CPUID extended function
capability is indicated by bits [55:48], but the driver currently
checks bits [63:56]. Adjust the driver to use bits [55:48] so that
extended function capability is detected correctly.
Fixes: bb13a84ed6b7 ("misc: amd-sbi: Add support for CPUID protocol")
Cc: stable@vger.kernel.org
Tested-by: Prathima L K <Prathima.Lk@amd.com>
Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
Signed-off-by: Akshay Gupta <Akshay.Gupta@amd.com>
---
Changes since v1:
- Added Cc "stable@vger.kernel.org" in commit message
drivers/misc/amd-sbi/rmi-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/amd-sbi/rmi-core.c b/drivers/misc/amd-sbi/rmi-core.c
index 1d4933c69dd2..d4238ebad3c6 100644
--- a/drivers/misc/amd-sbi/rmi-core.c
+++ b/drivers/misc/amd-sbi/rmi-core.c
@@ -48,7 +48,7 @@
/* CPUID MCAMSR mask & index */
#define CPUID_MCA_THRD_INDEX 32
#define CPUID_MCA_FUNC_MASK GENMASK(31, 0)
-#define CPUID_EXT_FUNC_INDEX 56
+#define CPUID_EXT_FUNC_INDEX 48
/* input for bulk write to CPUID protocol */
struct cpu_msr_indata {
--
2.34.1
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