From: tj@kernel.org (Tejun Heo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ahci: imx: PLL clock needs 100us to settle down
Date: Mon, 19 May 2014 16:09:00 -0400 [thread overview]
Message-ID: <20140519200900.GB27506@mtj.dyndns.org> (raw)
In-Reply-To: <1400330761-2432-1-git-send-email-shawn.guo@freescale.com>
On Sat, May 17, 2014 at 08:46:01PM +0800, Shawn Guo wrote:
> The commit e783c51 (ahci: imx: software workaround for phy reset issue
> in resume) calls imx_sata_phy_reset() to reset phy immediately after
> SATA MPLL is enabled. It seems working fine mostly, but fails in some
> case as below.
>
> ...
> ahci-imx 2200000.sata: failed to reset phy: -110
> ahci-imx: probe of 2200000.sata failed with error -110
>
> After talking to the designer, we learnt that when enabling i.MX6Q SATA
> MPLL, we need to wait 100us for it to settle down for safety. Add this
> required delay to fix above failure.
>
> Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Applied to libata/for-3.15-fixes.
Thanks.
--
tejun
next prev parent reply other threads:[~2014-05-19 20:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-17 12:46 [PATCH] ahci: imx: PLL clock needs 100us to settle down Shawn Guo
2014-05-17 13:58 ` Fabio Estevam
2014-05-17 14:05 ` Shawn Guo
2014-05-19 20:09 ` Tejun Heo [this message]
2014-05-24 19:35 ` Fabio Estevam
2014-05-25 6:40 ` Shawn Guo
2014-05-26 17:09 ` Fabio Estevam
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