linux-kernel - Re: [PATCH] cpufreq: loongson3: Support older SMC firmware

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Message-ID: <f032284d-25e4-4192-aeb2-1270e497a830@aosc.io>
Date: Tue, 24 Jun 2025 10:43:38 +0800
From: Mingcong Bai <jeffbai@...c.io>
To: Yao Zi <ziyao@...root.org>, Huacai Chen <chenhuacai@...nel.org>,
 WANG Xuerui <kernel@...0n.name>, "Rafael J. Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>
Cc: Jiaxun Yang <jiaxun.yang@...goat.com>, Kexy Biscuit
 <kexybiscuit@...c.io>, loongarch@...ts.linux.dev, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: loongson3: Support older SMC firmware

Greetings,

<snip>
  > This patch adds support for the SMC firmware found on these devices,
> which I denoted as "SMC-0" in the driver. Boost support is omitted,
> since determination of cores able to boost requires the driver to couple
> tightly with micro-architecture details.
> 
> For coexistence, I prefixed all SMC-call constants with their SMC
> versions, and introduced "SMC-0"-specific initialization and
> frequency-level-setup rountines.
> 
> Signed-off-by: Yao Zi <ziyao@...root.org>
> ---
>   drivers/cpufreq/loongson3_cpufreq.c | 287 ++++++++++++++++++++--------
>   1 file changed, 211 insertions(+), 76 deletions(-)

Tested good on an IPASON NL38-N11 (Loongson 3A6000) laptop, core 
frequencies fluctuate between 250MHz and 2000MHz individually as 
expected. CPU frequency scaling governors works as expected (performance 
pins all cores to 2000MHz, the max frequency).

Tested-by: Mingcong Bai <jeffbai@...c.io>

Best Regards,
Mingcong Bai