linux-kernel - Re: [PATCH v2] usb: typec: ucsi: Mark dGPUs as DEVICE scope

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Date:   Wed, 14 Jun 2023 02:16:21 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     heikki.krogerus@...ux.intel.com, ajayg@...dia.com,
        andriy.shevchenko@...ux.intel.com, linux-i2c@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, Evan.Quan@....com, Lijo.Lazar@....com,
        Sanket.Goswami@....com
Subject: Re: [PATCH v2] usb: typec: ucsi: Mark dGPUs as DEVICE scope

Hi Mario,

On Thu, May 18, 2023 at 11:11:50AM -0500, Mario Limonciello wrote:
> power_supply_is_system_supplied() checks whether any power
> supplies are present that aren't batteries to decide whether
> the system is running on DC or AC.  Downstream drivers use
> this to make performance decisions.
> 
> Navi dGPUs include an UCSI function that has been exported
> since commit 17631e8ca2d3 ("i2c: designware: Add driver
> support for AMD NAVI GPU").
> 
> This UCSI function registers a power supply since commit
> 992a60ed0d5e ("usb: typec: ucsi: register with power_supply class")
> but this is not a system power supply.
> 
> As the power supply for a dGPU is only for powering devices connected
> to dGPU, create a device property to indicate that the UCSI endpoint
> is only for the scope of `POWER_SUPPLY_SCOPE_DEVICE`.
> 
> Link: https://lore.kernel.org/lkml/20230516182541.5836-2-mario.limonciello@amd.com/
> Reviewed-by: Evan Quan <evan.quan@....com>
> Tested-by: Evan Quan <evan.quan@....com>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>

Acked-by: Andi Shyti <andi.shyti@...nel.org> 

Thanks,
Andi