linux-kernel - Re: [PATCH 3/3] mtd: nand: pxa3xx-nand: fix readid without keep

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Date:	Tue, 18 Aug 2015 10:59:53 +0200
From:	Antoine Tenart <antoine.tenart@...e-electrons.com>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mtd: nand: pxa3xx-nand: fix readid without
 keep_config

Hi,

On Mon, Aug 17, 2015 at 09:03:38PM +0200, Robert Jarzmik wrote:
> Ezequiel Garcia <ezequiel@...guardiasur.com.ar> writes:
> 
> > On 16 August 2015 at 19:22, Robert Jarzmik <robert.jarzmik@...e.fr> wrote:
> >> Ezequiel Garcia <ezequiel@...guardiasur.com.ar> writes:
> >>
> >>> On 11 Aug 09:57 PM, Robert Jarzmik wrote:
> >>>> The cases of READID detection are broken on pxa3xx. The reason is that
> >>>> in the early stages of nand probing, ie. at pxa3xx_nand_scan(), we
> >>>> always have :
> >>>>  - info->use_dma = 0 (regardless of dma support yet)
> >>>>  - info->chunk_size = 0 (not yet detected)
> >>>>
> >>>> The READID issued by pxa3xx_nand_scan() will therefore end up in
> >>>> handle_data_pio(), and do_bytes will be 0, leading to not reading the
> >>>> nand id, and blocking detection.
> >>>>
> >>>> This doesn't happen if "keep_config" is used, which is probably the most
> >>>> tested case.
> >>>>
> >>>> Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> >>>> Fixes: 70ed85232a93 ("mtd: nand: pxa3xx: Introduce multiple page I/O
> >>>> support")
> >>>
> >>> To be fair, Antoine submitted this a while ago:
> >>>
> >>> http://lists.infradead.org/pipermail/linux-mtd/2015-April/058739.html
> >>>
> >>> Not sure which one takes precedence in such a case (and yours
> >>> has a proper Fixes tag).
> >> His has precedence. How is it that a fix patch is not yet merge since April ?
> >> Is it because it's part of a still in review serie ?
> 
> Antoine, could you resubmit this single patch with this as trailer please :
> Acked-by: Robert Jarzmik <robert.jarzmik@...e>
> Fixes: 70ed85232a93 ("mtd: nand: pxa3xx: Introduce multiple page I/O
> support")

I just resend it.

Antoine

-- 
Antoine Ténart, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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