linux-kernel - Re: [PATCH 1/2] mtd: m25p80: Fix false-positive probing

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Message-ID: <AANLkTinP63VyX2LjY-zIbnluasCiT3tOv6tlfZ6k1WqM@mail.gmail.com>
Date:	Tue, 22 Jun 2010 13:56:00 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Anton Vorontsov <avorontsov@...sta.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Barry Song <21cnbao@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Artem Bityutskiy <dedekind1@...il.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	linux-mtd@...ts.infradead.org,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH 1/2] mtd: m25p80: Fix false-positive probing

On Tue, Jun 22, 2010 at 12:57, Anton Vorontsov wrote:
> Since commit 18c6182bae0acca220ed6611f741034d563cd19f ("Rework
> probing/JEDEC code"), m25p80 driver successfully registers chips
> even if JEDEC probing fails.
>
> This was needed to support non-JEDEC flashes. Though, it appears
> that some platforms (e.g. blackfin bf533 stamp[1]) used the old
> behavior to detect if there's any flash connected, so the driver
> have to fail on JEDEC probing errors.
>
> This patch restores the old behavior for JEDEC flashes, and adds
> "-nonjedec" SPI device IDs for M25Pxx flashes, so that the kernel
> still supports non-JEDEC flashes.

Acked-by: Mike Frysinger <vapier@...too.org>

> [1] http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=5975

http://blackfin.uclinux.org/gf/tracker/5975

> Reported-by: Mingquan Pan

<Grace.Pan@...log.com>
-mike
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