From: Sudeep Holla <sudeep.holla@arm.com>
To: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc: <cristian.marussi@arm.com>, <ulf.hansson@linaro.org>,
Sudeep Holla <sudeep.holla@arm.com>, <arm-scmi@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<ranjani.vaidyanathan@nxp.com>, Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH] pmdomain: arm: scmi_pm_domain: Initialize state as off
Date: Mon, 13 Jan 2025 10:31:21 +0000 [thread overview]
Message-ID: <Z4TreQ5bA9qiMTgC@bogus> (raw)
In-Reply-To: <20250110061346.2440772-1-peng.fan@oss.nxp.com>
On Fri, Jan 10, 2025 at 02:13:46PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
>
> Per ARM SCMI Spec DEN0056E, page 16, "The platform may disable a resource
> if no agent has requested to use that resource."
>
True, but ...
> Linux Kernel should not rely on a state that it has not requested, so
> make state as off during initialization.
>
IIUC, this was done to avoid any transitions if the bootloader like U-Boot
has turned on the resource and OS can just rely on that stay. Anyways if
the resource is not used by any driver/device in the kernel, won't it be
turned off anyways ? What am I missing ?
I need to dig details, but I remember doing what this patch does and
reverting to what we have based on the feedback IIRC.
--
Regards,
Sudeep
next prev parent reply other threads:[~2025-01-13 10:31 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-10 6:13 [PATCH] pmdomain: arm: scmi_pm_domain: Initialize state as off Peng Fan (OSS)
2025-01-13 10:31 ` Sudeep Holla [this message]
2025-01-13 11:37 ` Peng Fan
2025-01-13 13:49 ` Sudeep Holla
2025-01-13 15:30 ` [EXT] " Ranjani Vaidyanathan
2025-01-13 17:20 ` Sudeep Holla
2025-01-13 17:54 ` Cristian Marussi
2025-01-13 19:40 ` Ranjani Vaidyanathan
2025-01-13 19:54 ` Ranjani Vaidyanathan
2025-01-14 15:24 ` Sudeep Holla
2025-01-14 16:09 ` Ranjani Vaidyanathan
2025-01-14 18:16 ` Sudeep Holla
2025-01-15 9:15 ` Cristian Marussi
2025-01-15 18:42 ` Ranjani Vaidyanathan
2025-01-16 16:18 ` Cristian Marussi
2025-01-17 1:22 ` Peng Fan
2025-01-17 5:13 ` Dan Carpenter
2025-01-13 19:33 ` Cristian Marussi
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