From mboxrd@z Thu Jan 1 00:00:00 1970 From: boris.brezillon@free-electrons.com (Boris Brezillon) Date: Tue, 28 Feb 2017 10:19:17 +0100 Subject: [PATCH v2 2/3] drm/vc4: Add HDMI audio support In-Reply-To: <20170227202803.12855-2-eric@anholt.net> References: <20170227202803.12855-1-eric@anholt.net> <20170227202803.12855-2-eric@anholt.net> Message-ID: <20170228101917.40810aa9@bbrezillon> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, 27 Feb 2017 12:28:02 -0800 Eric Anholt wrote: > The HDMI encoder IP embeds all needed blocks to output audio, with a > custom DAI called MAI moving audio between the two parts of the HDMI > core. This driver now exposes a sound card to let users stream audio > to their display. > > Using the hdmi-codec driver has been considered here, but MAI meant > having to significantly rework hdmi-codec, and it would have left > little shared code with the I2S mode anyway. > > The encoder requires that the audio be SPDIF-formatted frames only, > which alsalib will format-convert for us. > > This patch is the combined work of Eric Anholt (initial register setup > with a separate dmaengine driver and using simple-audio-card) and > Boris Brezillon (moving it all into HDMI, massive debug to get it > actually working), and which Eric has the permission to release. > > v2: Drop "-audio" from sound card name, since that's already implied > (suggestion by Boris) > > Signed-off-by: Eric Anholt Acked-by: Boris Brezillon