[PATCH 0/3] Improve dw-hdmi CTS/N setting

Andy Yan andy.yan at rock-chips.com
Mon Mar 30 06:23:21 PDT 2015

Hi Russell:

On 2015年03月27日 19:13, Russell King - ARM Linux wrote:
> All,
> This is a mini-series to try and move audio support for the Designware
> HDMI bridge along.
> There are two known versions of the Designware HDMI audio:
> - The Rockchip version, which is based upon feeding the HDMI block I2S
>    stream(s), which doesn't have any on-board DMA support.
> - The Freescale version, which only has AHB DMA support.
> There are two drivers around at present, one which I've had which is
> ALSA based due to its simplicity for the Freescale version of the IP,
> and one which is ASoC based from Yakir Yang for the Rockchip version.
> There is some commonality between the two drivers - for example, the
> setup of the CTS/N values is very similar, although not identical.
> I have been reviewing (when time permits) the patches from Yakir Yang,
> and making recommendations to try and extract the common parts of the
> driver.  This is the patch set I came up with (mentioned in
> 20150202130920.GC8656 at n2100.arm.linux.org.uk).
> Yakir merged some of my ideas into his patch set - for example, Yakir
> Yang's "drm: bridge/dw_hdmi: combine hdmi_set_clock_regenerator_n() and
> hdmi_regenerate_cts()" is very close to the version which I came up
> with.
> Yakir Yang didn't include the mutex patch, which I've included here -
> it really is necessary because we have potentially two different
> threads which can change the CTS/N values - a change of the video mode
> vs a change in the audio driver.
> The last patch is adjusting the CTS/N setting order - I have only gone
> as far as what we know works for iMX6, and this is also identical to
> Yakir Yang's patch.
> The identical nature is hardly surprising; my patches were derived from
> a previous set of his patches (which I acknowledge in the commit messages)
> and I detailed in the above message what I wanted to see.
> What I would like to see is that - as we are effectively in agreement
> over two of these patches - we get these patches merged rather than
> having to repeatedly see them.  If there's any objection, please let me
> know, otherwise I'll collect acks and send them to David.
>   drivers/gpu/drm/bridge/dw_hdmi.c | 34 +++++++++++++++++++---------------
>   1 file changed, 19 insertions(+), 15 deletions(-)
   After talk with Yakir Yang, we are glad your suggestion and patch.
   Acked-by: Andy Yan <andy.yan at rock-chips.com>

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