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From: Thomas Richter <richter@rus.uni-stuttgart.de>
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>,
	"Daniel Vetter" <daniel@ffwll.ch>
Cc: intel-gfx <intel-gfx@lists.freedesktop.org>
Subject: R31 dithering
Date: Fri, 27 Mar 2015 19:57:52 +0100	[thread overview]
Message-ID: <5515A830.3030701@rus.uni-stuttgart.de> (raw)
In-Reply-To: <20150327093358.GA17410@intel.com>

Hi Daniel, hi Ville,

thanks for your help. I used now the debug output to research how to 
enable dithering on the intel VCH. Apparently, it is bit #4 in register
VR01 that enables dithering. This is cross-checked by enabling in the
dvo_ivch.c file, which greatly improves image quality for 24bpp output. 
The bit itself is documented as "reserved" in the intel documentation, 
though it works quite nicely here.

I will now cross-check a little bit which other side effects this bit
has if combined with other DVO features (16bpp output, and scaler 
enabled). As soon as I have more, I'll prepare a small kernel patch for
it.

Thanks and have a nice weekend,

Thomas

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  reply	other threads:[~2015-03-27 19:06 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-27  8:03 Addressing the intel VCH on the i2c bus / R31 dithering Thomas Richter
2015-03-27  8:40 ` Daniel Vetter
2015-03-27  9:33   ` Ville Syrjälä
2015-03-27 18:57     ` Thomas Richter [this message]
2015-03-30 11:55       ` Ville Syrjälä
2015-03-30 13:54         ` Thomas Richter
2015-03-30 13:59           ` Ville Syrjälä
2015-03-30 14:06             ` Thomas Richter

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