From: Jens Axboe <axboe@kernel.dk>
To: Timo Sigurdsson <public_timo.s@silentcreek.de>,
mripard@kernel.org, wens@csie.org, jernej.skrabec@siol.net,
linux-ide@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org
Cc: sergei.shtylyov@gmail.com, gregkh@linuxfoundation.org,
oliver@schinagl.nl
Subject: Re: [PATCH v2 RESEND] ata: ahci_sunxi: Disable DIPM
Date: Mon, 14 Jun 2021 08:27:04 -0600 [thread overview]
Message-ID: <4c873409-db09-31ea-485e-daa0433c674b@kernel.dk> (raw)
In-Reply-To: <20210614072539.3307-1-public_timo.s@silentcreek.de>
On 6/14/21 1:25 AM, Timo Sigurdsson wrote:
> DIPM is unsupported or broken on sunxi. Trying to enable the power
> management policy med_power_with_dipm on an Allwinner A20 SoC based board
> leads to immediate I/O errors and the attached SATA disk disappears from
> the /dev filesystem. A reset (power cycle) is required to make the SATA
> controller or disk work again. The A10 and A20 SoC data sheets and manuals
> don't mention DIPM at all [1], so it's fair to assume that it's simply not
> supported. But even if it was, it should be considered broken and best be
> disabled in the ahci_sunxi driver.
Applied, thanks.
--
Jens Axboe
prev parent reply other threads:[~2021-06-14 14:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 7:25 [PATCH v2 RESEND] ata: ahci_sunxi: Disable DIPM Timo Sigurdsson
2021-06-14 14:27 ` Jens Axboe [this message]
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