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Message-ID: <20150112131602.GX25319@htj.dyndns.org> Date: Mon, 12 Jan 2015 08:16:02 -0500 From: Tejun Heo <tj@...nel.org> To: Gabriele Mazzotta <gabriele.mzt@...il.com> Cc: linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org Subject: Re: SATA link power management issues 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; -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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