From: Wolfram Sang <w.sang@pengutronix.de>
To: Artem Bityutskiy <dedekind1@gmail.com>
Cc: Huang Shijie <b32955@freescale.com>,
linux-mtd@lists.infradead.org,
David Woodhouse <david.woodhouse@intel.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] mtd: nand: gpmi: reset BCH earlier, too, to avoid NAND startup problems
Date: Wed, 12 Dec 2012 17:01:08 +0100 [thread overview]
Message-ID: <20121212160108.GA2607@pengutronix.de> (raw)
In-Reply-To: <1355325103.3400.2.camel@sauron.fi.intel.com>
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On Wed, Dec 12, 2012 at 05:11:43PM +0200, Artem Bityutskiy wrote:
> On Wed, 2012-12-05 at 21:46 +0100, Wolfram Sang wrote:
> > It could happen (1 out of 100 times) that NAND did not start up
> > correctly after warm rebooting, so the kernel could not find the UBI or
> > DMA timed out due to a stalled BCH. When resetting BCH together with
> > GPMI, the issue could not be observed anymore (after 10000+ reboots). We
> > probably need the consistent state already before sending any command to
> > NAND, even when no ECC is needed. I chose to keep the extra reset for
> > BCH when changing the flash layout to be on the safe side.
> >
> > Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
> > Cc: Huang Shijie <b32955@freescale.com>
> > Cc: Artem Bityutskiy <dedekind1@gmail.com>
> > Cc: David Woodhouse <david.woodhouse@intel.com>
> > ---
> >
> > Would be really great to have in 3.7. Also a stable-candidate IMO.
>
> Pushed to l2-mtd.git, thanks
>
> If you believe this is suitable for stable, please let me know.
I strongly believe that.
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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From: w.sang@pengutronix.de (Wolfram Sang)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mtd: nand: gpmi: reset BCH earlier, too, to avoid NAND startup problems
Date: Wed, 12 Dec 2012 17:01:08 +0100 [thread overview]
Message-ID: <20121212160108.GA2607@pengutronix.de> (raw)
In-Reply-To: <1355325103.3400.2.camel@sauron.fi.intel.com>
On Wed, Dec 12, 2012 at 05:11:43PM +0200, Artem Bityutskiy wrote:
> On Wed, 2012-12-05 at 21:46 +0100, Wolfram Sang wrote:
> > It could happen (1 out of 100 times) that NAND did not start up
> > correctly after warm rebooting, so the kernel could not find the UBI or
> > DMA timed out due to a stalled BCH. When resetting BCH together with
> > GPMI, the issue could not be observed anymore (after 10000+ reboots). We
> > probably need the consistent state already before sending any command to
> > NAND, even when no ECC is needed. I chose to keep the extra reset for
> > BCH when changing the flash layout to be on the safe side.
> >
> > Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
> > Cc: Huang Shijie <b32955@freescale.com>
> > Cc: Artem Bityutskiy <dedekind1@gmail.com>
> > Cc: David Woodhouse <david.woodhouse@intel.com>
> > ---
> >
> > Would be really great to have in 3.7. Also a stable-candidate IMO.
>
> Pushed to l2-mtd.git, thanks
>
> If you believe this is suitable for stable, please let me know.
I strongly believe that.
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2012-12-12 16:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-05 20:46 [PATCH] mtd: nand: gpmi: reset BCH earlier, too, to avoid NAND startup problems Wolfram Sang
2012-12-05 20:46 ` Wolfram Sang
2012-12-06 2:16 ` Huang Shijie
2012-12-06 2:16 ` Huang Shijie
2012-12-06 9:52 ` Wolfram Sang
2012-12-06 9:52 ` Wolfram Sang
2012-12-06 14:58 ` Huang Shijie
2012-12-06 14:58 ` Huang Shijie
2012-12-06 16:58 ` Wolfram Sang
2012-12-06 16:58 ` Wolfram Sang
2012-12-11 2:01 ` Huang Shijie
2012-12-11 2:01 ` Huang Shijie
2012-12-12 15:11 ` Artem Bityutskiy
2012-12-12 15:11 ` Artem Bityutskiy
2012-12-12 16:01 ` Wolfram Sang [this message]
2012-12-12 16:01 ` Wolfram Sang
2012-12-13 11:41 ` Artem Bityutskiy
2012-12-13 11:41 ` Artem Bityutskiy
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