linux-kernel - Re: SATA link power management issues

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Date:	Mon, 12 Jan 2015 18:03:41 +0100
From:	Gabriele Mazzotta <gabriele.mzt@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: SATA link power management issues

On Monday 12 January 2015 08:16:02 Tejun Heo wrote:
> Hello,
> 
> What you're experiencing looks like the ssd behaving badly after link
> state transition.  I wonder whether the right solution is plugging
> PHYRDY IRQ for a while after LPM state change.  Does the following
> path make any difference?
> 
> Thanks.
> 
> diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
> index 97683e4..684f45d 100644
> --- a/drivers/ata/libahci.c
> +++ b/drivers/ata/libahci.c
> @@ -735,8 +735,8 @@ static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
>  		sata_link_scr_lpm(link, policy, false);
>  
>  		/* turn PHYRDY IRQ back on */
> -		pp->intr_mask |= PORT_IRQ_PHYRDY;
> -		writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
> +		//pp->intr_mask |= PORT_IRQ_PHYRDY;
> +		//writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
>  	}
>  
>  	return 0;

Hi,

I tried it and got the same result:

[  451.077463] ahci 0000:00:1f.2: port does not support device sleep
[  452.162451] ata3.00: exception Emask 0x10 SAct 0x400 SErr 0x50000 action 0xe frozen
[  452.162461] ata3.00: irq_stat 0x00400008, PHY RDY changed
[  452.162467] ata3: SError: { PHYRdyChg CommWake }
[  452.162473] ata3.00: failed command: WRITE FPDMA QUEUED
[  452.162484] ata3.00: cmd 61/58:50:98:7c:4b/00:00:17:00:00/40 tag 10 ncq 45056 out
         res 40/00:54:98:7c:4b/00:00:17:00:00/40 Emask 0x10 (ATA bus error)
[  452.162489] ata3.00: status: { DRDY }
[  452.162497] ata3: hard resetting link
[  452.886958] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[  452.890384] ata3.00: configured for UDMA/133
[  452.902976] ahci 0000:00:1f.2: port does not support device sleep
[  452.903002] ata3: EH complete

Gabriele
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