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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


      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 Timo Sigurdsson
2021-06-14 14:27 ` Jens Axboe [this message]

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