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Date: Mon, 17 Nov 2014 08:11:00 -0200
From: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
To: =?UTF-8?B?0JHQsNGA0YIg0JPQvtC/0L3QuNC6?= <bart.gopnik@gmail.com>
Cc: Ezequiel Garcia <elezegarcia@gmail.com>,
	Mike Thomas <rmthomas@sciolus.org>,
	linux-media <linux-media@vger.kernel.org>
Subject: Re: STK1160 Sharpness
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Em Mon, 17 Nov 2014 12:51:46 +0300
Барт Гопник <bart.gopnik@gmail.com> escreveu:

> (Where) can I find the the full list of the (key) differences between
> SAA7113 and GM7113?

I've no idea. Perhaps you would need to get both datasheets and compare
them.

> If it is not hard to do it, can anybody please implement it?

The hardest part seems to graduate the sharpness levels, as sharpness
actually is split into 3 different controls.

Of course, one interested on doing that would need to have a device
with the needed chipsets and time/interest on doing that.

Adding control framework at stk1160 also requires some time. I can't
volunteer myself of doing that. I don't have any stk1160-based
devices.

> Unfortunately, I'm not very good with system drivers programming.
> 
> I'm interesting only in sharpness control because the image quality
> (sharpness) during capture using CVBS input is bad (on my EasyCap
> device). If I use S-Video input, the quality (sharpness) is better. 

Yeah, the saa7115 datasheet (freely available at NXP site) mentions that 
sharpness control may be needed for some kinds of output.

> It is important to implement it, because the sharpness control
> implemented in hardware (not in software, post-processing filtering).
> Control of other parameters like gamma are also don't work, but I'm
> not sure that gamma control is hardware (not software) implemented
> (I'm not found any info about gamma in saa7113 datasheet).

Regards,
Mauro