linux-kernel - Re: [PATCH v4 0/2] backlight: update bl status and some bd properties when necessary

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Date:	Fri, 24 Jan 2014 17:20:44 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Liu Ying' <Ying.Liu@...escale.com>
Cc:	'Jean-Christophe PLAGNIOL-VILLARD' <plagnioj@...osoft.com>,
	'Tomi Valkeinen' <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	'Jani Nikula' <jani.nikula@...ux.intel.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH v4 0/2] backlight: update bl status and some bd properties
 when necessary

On Friday, January 24, 2014 3:05 PM, Liu Ying wrote:
> 
> We don't have to turn backlight on/off every time a blanking
> or unblanking event comes because the backlight status may
> have already been what we want. Another thought is that one
> backlight device may be shared by multiple framebuffers. We
> don't hope blanking one of the framebuffers may turn the
> backlight off for all the other framebuffers, since they are
> likely being active to display something. This patch set adds
> some logics to record each framebuffer's backlight usage to
> determine the backlight device use count and whether the
> backlight status should be updated or not.
> 
> Liu Ying (2):
>   backlight: update bd state & fb_blank properties when necessary
>   backlight: update backlight status when necessary

Thank you for sending the v4 patch.
I have no objection against this patch. However, I will wait
for other people's opinions. Then, if there is no objection,
I will ask Andrew Morton to merge this patch into mm-tree.
Thanks.

Best regards,
Jingoo Han

> 
> v3->v4:
> * Split v3 into 2 patches to separate the change for updating the
>   backlight device properties and backlight status, according to
>   the comments from Jani Nikula and Jingoo Han.
> 
> v2->v3:
> * Set fb_blank(*(int *)evdata->data) to bd->props.fb_blank
>   when we turn off a blacklight.
> * Correct some trivial typos in the commit message.
> 
> v1->v2:
> * Make the commit message be more specific about the condition
>   in which backlight device use count can be increased/decreased.
> * Correct the setting for bd->props.fb_blank.
> 
>  drivers/video/backlight/backlight.c |   28 +++++++++++++++++++++-------
>  include/linux/backlight.h           |    6 ++++++
>  2 files changed, 27 insertions(+), 7 deletions(-)
> 
> --
> 1.7.9.5


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