linux-kernel - Re: [PATCHv5 09/11] fbdev: ssd1307fb: Add module parameter to set the initial contrast

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Message-ID: <20150325211059.1ae68f8e@maestro.intranet>
Date:	Wed, 25 Mar 2015 21:10:59 +0100
From:	Thomas Niederprüm <niederp@...sik.uni-kl.de>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	plagnioj@...osoft.com, tomi.valkeinen@...com,
	kernel@...gutronix.de, shawn.guo@...aro.org, robh+dt@...nel.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv5 09/11] fbdev: ssd1307fb: Add module parameter to set
 the initial contrast

Am Tue, 24 Mar 2015 15:16:36 -0700
schrieb Maxime Ripard <maxime.ripard@...e-electrons.com>:

> On Tue, Mar 24, 2015 at 10:23:56PM +0100, Thomas Niederprüm wrote:
> > This patch adds the module parameter "contrast" to determine the
> > contrast value that is used to initialize the display. This
> > setting applies to all instances of the driver.
> > 
> > Signed-off-by: Thomas Niederprüm <niederp@...sik.uni-kl.de>
> 
> Do we still need this patch given that the next one is doing the exact
> same thing?
I was kind of expecting this objection. I added this module parameter
since it suits my use case where I always run the display at the lowest
possible contrast. With this module parameter I can specify this need
at module load time and I do not need udev or to touch the backlight
controls manually every time the driver is loaded. I see that this is
probably a (too) weak argument, so if nobody complains I will remove
this patch for the next round.

Thomas
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