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

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Message-ID: <CAJZ5v0jA6DiP=FoiWo2fs3sU7Do3ykgURoV+dzKE68NL9T5YFQ@mail.gmail.com>
Date: Thu, 15 Jan 2026 21:16:15 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Daniel Tang <danielzgtg.opensource@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, 
	Zhang Rui <rui.zhang@...el.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, 
	Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>, 
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH] powercap: intel_rapl: Add PL4 support for Ice Lake

On Thu, Jan 15, 2026 at 3:01 AM Daniel Tang
<danielzgtg.opensource@...il.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@...il.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!