linux-kernel - Re: [PATCH 0/2] make imx hdmi publicly used by dw hdmi compatible platform

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Date:	Tue, 4 Nov 2014 14:29:09 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Andy Yan <andy.yan@...k-chips.com>
Cc:	airlied@...ux.ie, heiko@...ech.de, fabio.estevam@...escale.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shawn Guo <shawn.guo@...aro.org>,
	Josh Boyer <jwboyer@...hat.com>,
	Sean Paul <seanpaul@...omium.org>,
	Inki Dae <inki.dae@...sung.com>,
	Dave Airlie <airlied@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	Zubair.Kakakhel@...tec.com, djkurtz@...gle.com, ykk@...k-chips.com,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 0/2] make imx hdmi publicly used by dw hdmi compatible
 platform

On Tue, Nov 04, 2014 at 09:33:10PM +0800, Andy Yan wrote:
> From: Andy yan <andy.yan@...k-chips.com>
> 
> We found freescale imx6 and rockchip rk3288 and Ingenic JZ4780 (Xburst/MIPS)
> use the interface compatible Designware HDMI IP, but they also have some
> lightly difference, such as phy pll configuration, register width(imx hdmi
> register is one byte, but rk3288 is 4 bytes width and can only access by word),
> 4K support(imx6 doesn't support 4k, but rk3288 does).
> 
> To reuse the imx-hdmi driver, we do this patch set:
> patch (1): split out imx-soc code from imx-hdmi to dw_hdmi-imx.c
> patch (2): move imx-hdmi to bridge/, and rename to dw-hdmi to
> make this driver indepent of drm-imx . And we will add rockchip 
> platform specific code dw_hdmi-rockchip.c later, this is depend
> on drm-rockchip.

Great - I fully agree that this needs to be renamed as it is a Designware
IP.

Should it be moved into bridge/ ?  It isn't implemented as a DRM bridge
driver at present, so this seems illogical.  Is the longer term plan to
convert it to be a DRM bridge?

Secondly, if you want HDMI audio support, you may find the patches I
maintain for the SolidRun devices useful, which add this as a standard
ALSA device.  I also have CEC support for it as well.  If you're
interested, I'll email those.

-- 
FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up
according to speedtest.net.
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