![Eric Anholt](/assets/img/avatar_default.png)
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
22 lines
624 B
Plaintext
22 lines
624 B
Plaintext
config DRM_VC4
|
|
tristate "Broadcom VC4 Graphics"
|
|
depends on ARCH_BCM2835 || COMPILE_TEST
|
|
depends on DRM
|
|
depends on SND && SND_SOC
|
|
depends on COMMON_CLK
|
|
select DRM_KMS_HELPER
|
|
select DRM_KMS_CMA_HELPER
|
|
select DRM_GEM_CMA_HELPER
|
|
select DRM_PANEL
|
|
select SND_PCM
|
|
select SND_PCM_ELD
|
|
select SND_SOC_GENERIC_DMAENGINE_PCM
|
|
select DRM_MIPI_DSI
|
|
help
|
|
Choose this option if you have a system that has a Broadcom
|
|
VC4 GPU, such as the Raspberry Pi or other BCM2708/BCM2835.
|
|
|
|
This driver requires that "avoid_warnings=2" be present in
|
|
the config.txt for the firmware, to keep it from smashing
|
|
our display setup.
|