linux-kernel - Re: [26/84] ARM: OMAP: RX-51: change probe order of touchscreen and panel SPI devices

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Date:	Thu, 1 Aug 2013 08:49:19 +0300
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Ben Hutchings <ben@...adent.org.uk>,
	Aaro Koskinen <aaro.koskinen@....fi>
CC:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
	<akpm@...ux-foundation.org>, Felipe Balbi <balbi@...com>,
	Pali Rohár <pali.rohar@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Tony Lindgren <tony@...mide.com>,
	Joni Lapilainen <joni.lapilainen@...il.com>
Subject: Re: [26/84] ARM: OMAP: RX-51: change probe order of touchscreen and
 panel SPI devices

Hi,

On 31/07/13 16:23, Ben Hutchings wrote:
> 3.2.50-rc1 review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Aaro Koskinen <aaro.koskinen@....fi>
> 
> commit e65f131a14726e5f1b880a528271a52428e5b3a5 upstream.
> 
> 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. SPI
> communication to the panel driver (spi1.2) fails unless the touchscreen
> (spi1.0) has been probed/initialized before. When the omap2-mcspi driver
> 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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