From mboxrd@z Thu Jan  1 00:00:00 1970
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Message-ID: <51F9F6DF.5070306@ti.com>
Date: Thu, 1 Aug 2013 08:49:19 +0300
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
MIME-Version: 1.0
To: Ben Hutchings <ben@decadent.org.uk>,
	Aaro Koskinen <aaro.koskinen@iki.fi>
CC: <linux-kernel@vger.kernel.org>, <stable@vger.kernel.org>,
	<akpm@linux-foundation.org>, Felipe Balbi <balbi@ti.com>,
	=?UTF-8?B?UGFsaSA=?= =?UTF-8?B?Um9ow6Fy?= <pali.rohar@gmail.com>,
	Sebastian Reichel <sre@debian.org>,
	Tony Lindgren <tony@atomide.com>,
	Joni Lapilainen <joni.lapilainen@gmail.com>
Subject: Re: [26/84] ARM: OMAP: RX-51: change probe order of touchscreen and
 panel SPI devices
References: <lsq.1375276989.521602504@decadent.org.uk>
In-Reply-To: <lsq.1375276989.521602504@decadent.org.uk>
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Hi,

On 31/07/13 16:23, Ben Hutchings wrote:
> 3.2.50-rc1 review patch.  If anyone has any objections, please let me k=
now.
>=20
> ------------------
>=20
> From: Aaro Koskinen <aaro.koskinen@iki.fi>
>=20
> commit e65f131a14726e5f1b880a528271a52428e5b3a5 upstream.
>=20
> Commit 9fdca9df (spi: omap2-mcspi: convert to module_platform_driver)
> broke the SPI display/panel driver probe on RX-51/N900. The exact cause=
 is
> not fully understood, but it seems to be related to the probe order. SP=
I
> communication to the panel driver (spi1.2) fails unless the touchscreen=

> (spi1.0) has been probed/initialized before. When the omap2-mcspi drive=
r
> was converted to a platform driver, it resulted in that the devices are=

> probed immediately after the board registers them in the order they are=

> listed in the board file.

I'm not really familiar with this issue, but:

The commit 9fdca9df was merged to v3.5. Has that also been backported to
3.2? If not, I don't think this patch is needed for 3.2, as the patch
causing the problem is not in 3.2.

 Tomi



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