[PATCH v2] platform/x86/intel/pmc: Update NVLS PCDS LPM request GUID

[PATCH v2] platform/x86/intel/pmc: Update NVLS PCDS LPM request GUID

[Xi Pardee]

The PMC SSRAM PMT telemetry GUID for Nova Lake S (NVLS) PCDS die
changed due to a firmware version bump. The GUID is used by the PMC
core driver to locate the correct PMT telemetry entry in SSRAM; if it
doesn't match the firmware-reported value, the driver fails to find the
LPM (Low Power Mode) data and cannot load properly.

Update PCDS_LPM_REQ_GUID from 0x01091102 to 0x01091103 to match the
new firmware version.

Signed-off-by: Xi Pardee <xi.pardee@linux.intel.com>
---
 drivers/platform/x86/intel/pmc/nvl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/pmc/nvl.c b/drivers/platform/x86/intel/pmc/nvl.c
index 8dabf2511dd9d..1ed02332dbfce 100644
--- a/drivers/platform/x86/intel/pmc/nvl.c
+++ b/drivers/platform/x86/intel/pmc/nvl.c
@@ -14,7 +14,7 @@
 /* PMC SSRAM PMT Telemetry GUIDS */
 #define PCDH_LPM_REQ_GUID 0x01093101
 #define PCHS_LPM_REQ_GUID 0x01092101
-#define PCDS_LPM_REQ_GUID 0x01091102
+#define PCDS_LPM_REQ_GUID 0x01091103
 
 /*
  * Die Mapping to Product.
-- 
2.43.0

Re: [PATCH v2] platform/x86/intel/pmc: Update NVLS PCDS LPM request GUID

[Ilpo Järvinen]

On Wed, 22 Jul 2026, Xi Pardee wrote:

> The PMC SSRAM PMT telemetry GUID for Nova Lake S (NVLS) PCDS die
> changed due to a firmware version bump. The GUID is used by the PMC
> core driver to locate the correct PMT telemetry entry in SSRAM; if it
> doesn't match the firmware-reported value, the driver fails to find the
> LPM (Low Power Mode) data and cannot load properly.
> 
> Update PCDS_LPM_REQ_GUID from 0x01091102 to 0x01091103 to match the
> new firmware version.

Hi,

Unfortunately this still lacks the reason why it's okay to not have 
0x01091102 at all in the kernel.

Whenever there's two (or more) FW versions mentioned in the changelog 
and one is taken away, it should be explained why "removing" one does 
not result in taking away functionality for systems that have the old 
FW version.

It may be dead obvious to you at this moment such as that this thing 
hasn't launched but it should still be recorded into the changelog so 
others don't need to lookup such details.

It seems to become a theme these get updated so hopefully next time we 
don't need 3 patch versions. :-)

-- 
 i.

> Signed-off-by: Xi Pardee <xi.pardee@linux.intel.com>
> ---
>  drivers/platform/x86/intel/pmc/nvl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/intel/pmc/nvl.c b/drivers/platform/x86/intel/pmc/nvl.c
> index 8dabf2511dd9d..1ed02332dbfce 100644
> --- a/drivers/platform/x86/intel/pmc/nvl.c
> +++ b/drivers/platform/x86/intel/pmc/nvl.c
> @@ -14,7 +14,7 @@
>  /* PMC SSRAM PMT Telemetry GUIDS */
>  #define PCDH_LPM_REQ_GUID 0x01093101
>  #define PCHS_LPM_REQ_GUID 0x01092101
> -#define PCDS_LPM_REQ_GUID 0x01091102
> +#define PCDS_LPM_REQ_GUID 0x01091103
>  
>  /*
>   * Die Mapping to Product.
>