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bb7d785688
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 <eric@anholt.net>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170227202803.12855-2-eric@anholt.net
21 lines
624 B
Text
21 lines
624 B
Text
config DRM_VC4
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tristate "Broadcom VC4 Graphics"
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depends on ARCH_BCM2835 || COMPILE_TEST
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depends on DRM
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depends on SND && SND_SOC
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depends on COMMON_CLK
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select DRM_KMS_HELPER
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select DRM_KMS_CMA_HELPER
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select DRM_GEM_CMA_HELPER
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select DRM_PANEL
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select SND_PCM
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select SND_PCM_ELD
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select SND_SOC_GENERIC_DMAENGINE_PCM
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select DRM_MIPI_DSI
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help
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Choose this option if you have a system that has a Broadcom
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VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
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This driver requires that "avoid_warnings=2" be present in
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the config.txt for the firmware, to keep it from smashing
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our display setup.
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