powercap: intel_rapl: Add PL4 support for Ice Lake

[PATCH] powercap: intel_rapl: Add PL4 support for Ice Lake

Posted by Daniel Tang 3 weeks, 2 days ago

Microsoft Surface Pro 7 firmware throttles the processor upon
boot/resume. Userspace needs to be able to restore the correct value.

Link: https://github.com/linux-surface/linux-surface/issues/706
Signed-off-by: Daniel Tang <danielzgtg.opensource@gmail.com>
---
 drivers/powercap/intel_rapl_msr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/powercap/intel_rapl_msr.c b/drivers/powercap/intel_rapl_msr.c
index 9a7e150b3536..a2bc0a9c1e10 100644
--- a/drivers/powercap/intel_rapl_msr.c
+++ b/drivers/powercap/intel_rapl_msr.c
@@ -162,6 +162,7 @@ static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
 
 /* List of verified CPUs. */
 static const struct x86_cpu_id pl4_support_ids[] = {
+	X86_MATCH_VFM(INTEL_ICELAKE_L, NULL),
 	X86_MATCH_VFM(INTEL_TIGERLAKE_L, NULL),
 	X86_MATCH_VFM(INTEL_ALDERLAKE, NULL),
 	X86_MATCH_VFM(INTEL_ALDERLAKE_L, NULL),
-- 
2.51.0

Re: [PATCH] powercap: intel_rapl: Add PL4 support for Ice Lake

Posted by Rafael J. Wysocki 3 weeks, 1 day ago

On Thu, Jan 15, 2026 at 3:01 AM Daniel Tang
<danielzgtg.opensource@gmail.com> wrote:
>
> Microsoft Surface Pro 7 firmware throttles the processor upon
> boot/resume. Userspace needs to be able to restore the correct value.
>
> Link: https://github.com/linux-surface/linux-surface/issues/706
> Signed-off-by: Daniel Tang <danielzgtg.opensource@gmail.com>
> ---
>  drivers/powercap/intel_rapl_msr.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/powercap/intel_rapl_msr.c b/drivers/powercap/intel_rapl_msr.c
> index 9a7e150b3536..a2bc0a9c1e10 100644
> --- a/drivers/powercap/intel_rapl_msr.c
> +++ b/drivers/powercap/intel_rapl_msr.c
> @@ -162,6 +162,7 @@ static int rapl_msr_write_raw(int cpu, struct reg_action *ra)
>
>  /* List of verified CPUs. */
>  static const struct x86_cpu_id pl4_support_ids[] = {
> +       X86_MATCH_VFM(INTEL_ICELAKE_L, NULL),
>         X86_MATCH_VFM(INTEL_TIGERLAKE_L, NULL),
>         X86_MATCH_VFM(INTEL_ALDERLAKE, NULL),
>         X86_MATCH_VFM(INTEL_ALDERLAKE_L, NULL),
> --

Applied 6.20 material, thanks!