diff mbox series

[v2,5/6] cppc_acpi: print error message if CPPC is unsupported

Message ID 7ff16a39e508eeadf26afbffb2f621de180bcde8.1706863981.git.perry.yuan@amd.com
State New
Headers
Series AMD Pstate Fixes And Enhancements |

Commit Message

Yuan, Perry Feb. 2, 2024, 8:55 a.m. UTC 
  to be more clear what is wrong with CPPC when pstate driver failed to
load which has dependency on the CPPC capabilities.

Add one more debug message to notify user if CPPC is not supported by
the CPU, then it will be easy to find out what need to fix for pstate
driver loading issue.

[    0.477523] amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled

Above message is not clear enough to verify whether CPPC is not supported.

Signed-off-by: Perry Yuan <perry.yuan@amd.com>
---
 drivers/acpi/cppc_acpi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Comments

Mario Limonciello Feb. 2, 2024, 3:17 p.m. UTC | #1 
On 2/2/2024 02:55, Perry Yuan wrote:
> to be more clear what is wrong with CPPC when pstate driver failed to
> load which has dependency on the CPPC capabilities.
> 
> Add one more debug message to notify user if CPPC is not supported by
> the CPU, then it will be easy to find out what need to fix for pstate
> driver loading issue.
> 
> [    0.477523] amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled
> 
> Above message is not clear enough to verify whether CPPC is not supported.
> 
> Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
> ---
>   drivers/acpi/cppc_acpi.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
> index a50e70abdf19..e23a84f4a50a 100644
> --- a/drivers/acpi/cppc_acpi.c
> +++ b/drivers/acpi/cppc_acpi.c
> @@ -679,8 +679,10 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
>   
>   	if (!osc_sb_cppc2_support_acked) {
>   		pr_debug("CPPC v2 _OSC not acked\n");
> -		if (!cpc_supported_by_cpu())
> +		if (!cpc_supported_by_cpu()) {
> +			pr_debug("CPPC is not supported by the CPU\n");
>   			return -ENODEV;
> +		}
>   	}
>   
>   	/* Parse the ACPI _CPC table for this CPU. */
diff mbox series

Patch

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index a50e70abdf19..e23a84f4a50a 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -679,8 +679,10 @@  int acpi_cppc_processor_probe(struct acpi_processor *pr)
 
 	if (!osc_sb_cppc2_support_acked) {
 		pr_debug("CPPC v2 _OSC not acked\n");
-		if (!cpc_supported_by_cpu())
+		if (!cpc_supported_by_cpu()) {
+			pr_debug("CPPC is not supported by the CPU\n");
 			return -ENODEV;
+		}
 	}
 
 	/* Parse the ACPI _CPC table for this CPU. */