linux-kernel - Re: [PATCH for-4.4 1/2] mtd: spi-nor: fix Spansion regressions (aliased with Winbond)

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Message-ID: <20160105022928.GF109450@google.com>
Date:	Mon, 4 Jan 2016 18:29:28 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Daniel Kurtz <djkurtz@...omium.org>,
	Marek Vasut <marex@...x.de>,
	Bayi Cheng <bayi.cheng@...iatek.com>,
	Rafał Miłecki <zajec5@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>,
	Eddie Huang (黃智傑) 
	<eddie.huang@...iatek.com>,
	Milton Chiang (江明晏) 
	<Milton.Chiang@...iatek.com>
Subject: Re: [PATCH for-4.4 1/2] mtd: spi-nor: fix Spansion regressions
 (aliased with Winbond)

On Tue, Dec 15, 2015 at 10:48:20AM -0800, Brian Norris wrote:
> Spansion and Winbond have occasionally used the same manufacturer ID,
> and they don't support the same features. Particularly, writing SR=0
> seems to break read access for Spansion's s25fl064k. Unfortunately, we
> don't currently have a way to differentiate these Spansion and Winbond
> parts, so rather than regressing support for these Spansion flash, let's
> drop the new Winbond lock/unlock support for now. We can try to address
> Winbond support during the next release cycle.
> 
> Original discussion:
> 
> http://patchwork.ozlabs.org/patch/549173/
> http://patchwork.ozlabs.org/patch/553683/
> 
> Fixes: 357ca38d4751 ("mtd: spi-nor: support lock/unlock/is_locked for Winbond")
> Fixes: c6fc2171b249 ("mtd: spi-nor: disable protection for Winbond flash at startup")
> Signed-off-by: Brian Norris <computersforpeace@...il.com>
> Reported-by: Felix Fietkau <nbd@...nwrt.org>
> Cc: Felix Fietkau <nbd@...nwrt.org>

Felix,

Can I get a Tested-by? I'm going to send this for 4.4 still, if
possible.

Brian
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