I'm sending this series for comments, and to allow people to update their code bases (for those who are using my AHB audio driver on iMX6). This is really several series, and I'm not expecting this to be ready for the upcoming merge window. That said, if anyone wants to say that they're happy with some of the initial six patches, I'm happy to queue those for David, if he's willing to take them.

This series applies on top of my previous series, with the three patches from the rockchip guys applied, iow:

drm: rockchip/dw_hdmi-rockchip: improve for HDMI electrical test drm: bridge/dw_hdmi: separate VLEVCTRL settting into platform driver drm: bridge/dw_hdmi: fixed codec style drm: bridge/dw_hdmi: adjust n/cts setting order drm: bridge/dw_hdmi: protect n/cts setting with a mutex drm: bridge/dw_hdmi: combine hdmi_set_clock_regenerator_n() and hdmi_regenerate_cts()

The first four patches are a few cleanups to the dw_hdmi driver.

The next two patches introduce new interfaces to the dw_hdmi driver to support AHB audio, including the errata found on iMX6 which requires N to be programmed to zero when the audio FIFO is not full. I'm expecting some discussion with these last two as we try to work out how to deal with the two variants of audio support for this part (AHB audio vs I2S audio).

The following three add various helpers to the DRM and ALSA subsystems for audio support which is non-specific to the AHB audio driver. For DRM, this is a helper macro to obtain the pointer into the short audio descriptors. For ALSA, it's a set of helpers to restrict an audio PCM device's capabilities according to the ELD, and to generate the IEC958 channel status data. If these helpers are acceptable, we can convert a number of drivers to them.

The ELD helper isn't quite finished, but should be sufficient for initial testing.

The last two patches add support for the dw_hdmi audio. This is an ALSA driver rather than an ASoC driver as it's a pretty simple affair. I couldn't find a suitable location in the sound/ subtree to place it, so I've placed it next to the bridge - yes, we probably need to find it a better home in the sound/ subtree, but it currently makes use of dw_hdmi.h in the directory it lives.

drivers/gpu/drm/bridge/Kconfig | 11 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.c | 566 +++++++++++++++++++++++++++++ drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.h | 14 + drivers/gpu/drm/bridge/dw_hdmi.c | 321 +++++++++------- drivers/gpu/drm/bridge/dw_hdmi.h | 3 + drivers/gpu/drm/imx/dw_hdmi-imx.c | 5 + include/drm/bridge/dw_hdmi.h | 7 + include/drm/drm_edid.h | 19 + include/sound/pcm_drm_eld.h | 6 + include/sound/pcm_iec958.h | 9 + sound/core/Kconfig | 6 + sound/core/Makefile | 2 + sound/core/pcm_drm_eld.c | 92 +++++ sound/core/pcm_iec958.c | 95 +++++ 15 files changed, 1029 insertions(+), 128 deletions(-)