linux-kernel - Re: [PATCH] mfd: Fix RTS5227 (and others) powermanagement

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Message-ID: <20171207094851.7rbswmhtp3ddl774@dell>
Date:   Thu, 7 Dec 2017 09:48:51 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Rui Feng <rui_feng@...lsil.com.cn>
Subject: Re: [PATCH] mfd: Fix RTS5227 (and others) powermanagement

On Wed, 06 Dec 2017, Hans de Goede wrote:

> Commit 8275b77a1513 ("mfd: rts5249: Add support for RTS5250S power
> saving") adds powersaving support for device-ids 5249 524a and 525a.
> 
> But as a side effect it breaks ASPM support for all the other device-ids,
> causing e.g. the Haswell CPU on a Lenovo T440s to not go into a higher
> c-state then PC3, while previously it would go to PC7, causing the
> machine to idle at 7.4W instead of 6.6W!
> 
> The problem here is the new option.dev_aspm_mode field, which only gets
> explicitly initialized in the new code for the device-ids 5249 524a and
> 525a. Leaving the dev_aspm_mode 0 for the other device-ids.
> 
> The default dev_aspm_mode 0 is mapped to DEV_ASPM_DISABLE, but the
> old behavior of calling rtsx_pci_enable_aspm() when idle and
> rtsx_pci_disable_aspm() when busy happens when dev_aspm_mode ==
> DEV_ASPM_DYNAMIC.
> 
> This commit changes the enum so that 0 = DEV_ASPM_DYNAMIC matching the
> old default behavior, fixing the pm regression with the other device-ids.
> 
> Cc: Rui Feng <rui_feng@...lsil.com.cn>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  include/linux/mfd/rtsx_pci.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied, thanks.

-- 
Lee Jones
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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