linux-kernel - Re: [PATCH] backlight: corgi_lcd: Fix WARN_ON() when calling corgi_bl_set

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Date:	Thu, 29 Nov 2012 14:09:51 +0100
From:	Marko Katić <dromede@...il.com>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	FlorianSchandinat@....de, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH] backlight: corgi_lcd: Fix WARN_ON() when calling corgi_bl_set_intensity.

On Thu, Nov 29, 2012 at 6:30 AM, Jingoo Han <jg1.han@...sung.com> wrote:
> On Thursday, November 29, 2012 6:47 AM, Marko Katic wrote
>> Subject: [PATCH] backlight: corgi_lcd: Fix WARN_ON() when calling corgi_bl_set_intensity.
>
> CC'ed Andrew Morton.
>
>
> Hi Marko Katic,
> The commit subject and commit message are not clear.
>
> How about using subject as below?
> backlight: corgi_lcd: use gpio_set_value_cansleep()
>
> In addition, 'Fix WARN_ON() when calling corgi_bl_set_intensity'
> would be the reason why you submit this patch.
> Please make the commit message more detail.
>
> Also, I have a question on gpio driver.
> In order to trigger WARN_ON(chip->can_sleep), 'can_sleep' should be
> set as 1. However, I cannot find 'can_sleep = 1' in the PXA gpio driver.
> What gpio driver do you use to test corgi_lcd driver?
>
>
> Best regards,
> Jingoo Han
>

Well, the commit message was short because i thought it was a quick
and obvious fix.
But it doesn't really matter now since you raise a valid point with
your question.
There are two classes of devices that use this lcd, corgi and spitz
(both are in mach-pxa tree). Both have
several variants. All of them use the SCOOP chip for backlight control
(arm/common/scoop.c) except akita which
uses the max7310 gpio expander for backlight control. The SCOOP chip
driver doesn't set can_sleep but the
max7310 does. So this patch is probably only valid for akita machines.
I'll test this further and post a revised patch
soon.
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