linux-kernel - RE: [V5 PATCH 1/1] driver:mtd:spi-nor: Add quad I/O support for Micron spi nor

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Date:	Thu, 13 Nov 2014 10:26:39 -0600
From:	Graham Moore <grmoore@...nsource.altera.com>
To:	bpqw <bpqw@...ron.com>
CC:	Graham Moore <grmoore@...nsource.altera.com>,
	Brian Norris <computersforpeace@...il.com>,
	Marek Vasut <marex@...x.de>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"geert+renesas@...der.be" <geert+renesas@...der.be>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"shijie8@...il.com" <shijie8@...il.com>
Subject: RE: [V5 PATCH 1/1] driver:mtd:spi-nor: Add quad I/O support for
 Micron spi nor



On Wed, 12 Nov 2014, bpqw wrote:

> This maybe your spi controller is still extended mode, 
> Once EVCR bit 7 is set to 0, the spi nor device will operate in quad I/O.Command-address-data line is 4-x-4.
> So after send WRITE EVCR command , spi controller also  must transfer to quad I/O Mode,and set its Command-address-data line also
> Should be 4-x-4 .

Thanks, this helped.  I added some code to snoop the command stream for 
WRITE EVCR with quad mode, and then set up the quad mode in the 
controller.  Seems kinda ugly, but working now.

-Graham
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