linux-kernel - Re: [PATCH v3 2/2] mtd: nand: omap: Synchronize the access to the ECC engine

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Message-ID: <1414574218.15269.4.camel@lp-lvrv.comap.cz>
Date:	Wed, 29 Oct 2014 10:16:58 +0100
From:	Rostislav Lisovy <lisovy@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Tony Lindgren <tony@...mide.com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	michal.vokac@...ap.cz, sojkam1@....cvut.cz,
	Rostislav Lisovy <lisovy@...ica.cz>
Subject: Re: [PATCH v3 2/2] mtd: nand: omap: Synchronize the access to the
 ECC engine

On Thu, 2014-10-02 at 16:16 +0200, Rostislav Lisovy wrote:
> The AM335x Technical Reference Manual (spruh73j.pdf) says
> "Because the ECC engine includes only one accumulation context,
> it can be allocated to only one chip-select at a time ... "
> (7.1.3.3.12.3). Since the commit 97a288ba2cfa ("ARM: omap2+:
> gpmc-nand: Use dynamic platform_device_alloc()") gpmc-nand
> driver supports multiple NAND flash devices connected to
> the single controller.
> Use global 'struct nand_hw_control' among multiple NAND
> instances to synchronize the access to the single ECC Engine.
> 
> Tested with custom AM335x board using 2x NAND flash chips.
> 
> Signed-off-by: Rostislav Lisovy <lisovy@...ica.cz>


Just a kind appeal if someone is willing to review this.

Best regards;
Rostislav

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