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Date: Mon, 4 Jan 2016 18:29:28 -0800
From: Brian Norris <computersforpeace@gmail.com>
To: linux-mtd@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Daniel Kurtz <djkurtz@chromium.org>,
 Marek Vasut <marex@denx.de>, Bayi Cheng <bayi.cheng@mediatek.com>,
 =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>,
 Felix Fietkau <nbd@openwrt.org>,
 Eddie Huang =?utf-8?B?KOm7g+aZuuWCkSk=?= <eddie.huang@mediatek.com>,
 Milton Chiang =?utf-8?B?KOaxn+aYjuaZjyk=?= <Milton.Chiang@mediatek.com>
Subject: Re: [PATCH for-4.4 1/2] mtd: spi-nor: fix Spansion regressions
 (aliased with Winbond)
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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@gmail.com>
> Reported-by: Felix Fietkau <nbd@openwrt.org>
> Cc: Felix Fietkau <nbd@openwrt.org>

Felix,

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

Brian