linux-kernel - Re: [PATCH v2 RESEND] ata: ahci

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Message-ID: <4c873409-db09-31ea-485e-daa0433c674b@kernel.dk>
Date:   Mon, 14 Jun 2021 08:27:04 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Timo Sigurdsson <public_timo.s@...entcreek.de>, mripard@...nel.org,
        wens@...e.org, jernej.skrabec@...l.net, linux-ide@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     sergei.shtylyov@...il.com, gregkh@...uxfoundation.org,
        oliver@...inagl.nl
Subject: Re: [PATCH v2 RESEND] ata: ahci_sunxi: Disable DIPM

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