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drm: bridge/dw_hdmi-ahb-audio: add audio driver

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Add ALSA based HDMI AHB audio driver for dw_hdmi.  The only buffer
format supported by the hardware is its own special IEC958 based format,
which is not compatible with any ALSA format.  To avoid doing too much
data manipulation within the driver, we support only ALSAs IEC958 LE and
24-bit PCM formats for 2 to 6 channels, which we convert to its hardware
format.

A more desirable solution would be to have this conversion in userspace,
but ALSA does not appear to allow such transformations outside of
libasound itself.

Reviewed-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2013-11-07 16:01:45 +00:00
parent aeac23bda8
commit 7ed6c665e1
6 changed files with 631 additions and 0 deletions
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11
drivers/gpu/drm/bridge/Kconfig
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@@ -11,6 +11,17 @@ config DRM_DW_HDMI
tristate
select DRM_KMS_HELPER
config DRM_DW_HDMI_AHB_AUDIO
tristate "Synopsis Designware AHB Audio interface"
depends on DRM_DW_HDMI && SND
select SND_PCM
select SND_PCM_IEC958
help
Support the AHB Audio interface which is part of the Synopsis
Designware HDMI block. This is used in conjunction with
the i.MX6 HDMI driver.
config DRM_NXP_PTN3460
tristate "NXP PTN3460 DP/LVDS bridge"
depends on OF