linux-kernel - Re: [PATCH v2 06/12] drm: bridge/dw_hdmi: add audio support for more display resolutions

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Date:	Sat, 31 Jan 2015 08:28:54 -0500
From:	Yang Kuankuan <ykk@...k-chips.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	David Airlie <airlied@...ux.ie>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Rob Clark <robdclark@...il.com>,
	Mark Yao <mark.yao@...k-chips.com>,
	Daniel Vetter <daniel@...ll.ch>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	djkurtz@...omium.org, dbehr@...omoum.org, mmind00@...glemail.com,
	dianders@...omium.org, marcheu@...omium.org,
	rockchip-discuss@...omium.org
Subject: Re: [PATCH v2 06/12] drm: bridge/dw_hdmi: add audio support for more
 display resolutions


On 01/31/2015 06:20 AM, Russell King - ARM Linux wrote:
> On Fri, Jan 30, 2015 at 06:30:39AM -0500, Yakir Yang wrote:
>> Add more n/cts values, in that case we can support audio for more
>> display resolutions (128 * SampleRate = PixelClock * N / CTS).
> Where do these come from?  The iMX6 manuals give the set which are
> already in the driver, and says that others are not supported - to
> quote...
>
> "Table below shows the CTS and N values for the supported standard.
> All other TMDS clocks are not supported, the TMDS clocks divided or
> multiplied by 1,001 coefficients are not supported."
>
> and the table lists values for TMDS clocks of 25.2, 27, 54, 74.25,
> 148.5 and 297MHz.
>
> This will need to be tested on iMX6 to validate whether it works.
> If it doesn't work, we need to conditionalise the new TMDS clocks
> with the IP version.
>
I just want to add audio support for some No-CEA display resolutions, 
and actually it can works on rk3288 platform.
If it can not work on iMX6 platform, i will add IP verison select in 
next version v3.

Thanks.  : )



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