linux-kernel - Re: [PATCH 2/3] firmware: exynos-acpm: add DVFS protocol

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c82cb87e-c793-45b1-bfad-fa00fae1d9c7@linaro.org>
Date: Mon, 25 Aug 2025 13:02:37 +0100
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Peter Griffin <peter.griffin@...aro.org>,
 André Draszik <andre.draszik@...aro.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>,
 Sylwester Nawrocki <s.nawrocki@...sung.com>,
 Chanwoo Choi <cw00.choi@...sung.com>
Cc: linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-clk@...r.kernel.org, willmcvicker@...gle.com, kernel-team@...roid.com
Subject: Re: [PATCH 2/3] firmware: exynos-acpm: add DVFS protocol



On 8/24/25 6:11 PM, Krzysztof Kozlowski wrote:
> On 19/08/2025 13:45, Tudor Ambarus wrote:
>> Add ACPM DVFS protocol handler. It constructs DVFS messages that
>> the APM firmware can understand.
>>
>> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
>> ---
>>  drivers/firmware/samsung/Makefile                  |  4 +-
>>  drivers/firmware/samsung/exynos-acpm-dvfs.c        | 85 ++++++++++++++++++++++
>>  drivers/firmware/samsung/exynos-acpm-dvfs.h        | 21 ++++++
>>  drivers/firmware/samsung/exynos-acpm.c             |  5 ++
>>  .../linux/firmware/samsung/exynos-acpm-protocol.h  | 10 +++
>>  5 files changed, 124 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/firmware/samsung/Makefile b/drivers/firmware/samsung/Makefile
>> index 7b4c9f6f34f54fd731886d97a615fe1aa97ba9a0..80d4f89b33a9558b68c9083da675c70ec3d05f19 100644
>> --- a/drivers/firmware/samsung/Makefile
>> +++ b/drivers/firmware/samsung/Makefile
>> @@ -1,4 +1,6 @@
>>  # SPDX-License-Identifier: GPL-2.0-only
>>  
>> -acpm-protocol-objs			:= exynos-acpm.o exynos-acpm-pmic.o
>> +acpm-protocol-objs			:= exynos-acpm.o
>> +acpm-protocol-objs			+= exynos-acpm-pmic.o
>> +acpm-protocol-objs			+= exynos-acpm-dvfs.o
>>  obj-$(CONFIG_EXYNOS_ACPM_PROTOCOL)	+= acpm-protocol.o
>> diff --git a/drivers/firmware/samsung/exynos-acpm-dvfs.c b/drivers/firmware/samsung/exynos-acpm-dvfs.c
>> new file mode 100644
>> index 0000000000000000000000000000000000000000..ee457c1a3de2ff2e4395d9fc3ff4c13294473b2d
>> --- /dev/null
>> +++ b/drivers/firmware/samsung/exynos-acpm-dvfs.c
>> @@ -0,0 +1,85 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Copyright 2020 Samsung Electronics Co., Ltd.
>> + * Copyright 2020 Google LLC.
>> + * Copyright 2025 Linaro Ltd.
>> + */
>> +
>> +#include <linux/bitfield.h>
>> +#include <linux/firmware/samsung/exynos-acpm-protocol.h>
>> +#include <linux/ktime.h>
>> +#include <linux/types.h>
>> +#include <linux/units.h>
>> +
>> +#include "exynos-acpm.h"
>> +#include "exynos-acpm-dvfs.h"
>> +
>> +#define ACPM_DVFS_ID			GENMASK(11, 0)
>> +#define ACPM_DVFS_REQ_TYPE		GENMASK(15, 0)
>> +
>> +enum exynos_acpm_dvfs_func {
>> +	ACPM_DVFS_FREQ_REQ,
>> +	ACPM_DVFS_FREQ_GET,
>> +};
> 
> These are actual values for hardware/firmware? If so, please use rather
> defines.

yes, they are. Will do, thanks!