Hi, I would like to solicit comments on this set of patches. Now that ASoC part of the implementation has been Ack'ed by ASoC maintainers, these patches are needed. Thanks! Ricardo Le jeudi 05 mai 2011 Ã 02:01 -0500, Neri, Ricardo a Ãcrit : > This is to add support for HDMI audio on OMAP4 chips. This work has two > parts: DSS implementation and ASoC implementation. This set of patches > presents the DSS implementation. The approach is to utilize the DSS > HDMI driver to act as an ASoC codec. Then, functionality and data > structures are added to the DSS HDMI driver to configure parameters > relevant to audio such as sample rate and frequency and DMA. > The ASoC implementation adds an HDMI audio card that will utilize this > HDMI ASoC codec. The ASoC implementation is also under review in the > alsa-devel list. > > This implementation is for Basic Audio as defined in CEA-861-D: 16 bit/sample > linear PCM 2-channel audio with sample rates of 32, 44.1 and 48kHz. As > described in the HDMI specification, support for Basic Audio is mandatory > for HDMI sinks and does not require of EDID parsing. > > Additionally, this implementation supports 24-bit samples in 32-bit words. > Further audio capabilities such as more sample rates and multichannel audio > will be added in the future when EDID parsing is available for HDMI driver. > > This implementation is based on on: > * OMAP4: DSS2: Add dss_dss_clk opt clock for OMAP4, by Sumit Semwal > (http://gitorious.org/linux-omap-dss2/linux/commit/0da5637569bb9bf93e6930cd1c3b452eede50ba2) > * Kernel 2.6.39-rc6 > (git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git v2.6.39-rc6) > > In order to validate functionality, it is necessary to utilize the ASoC > HDMI CPU and machine drivers for HDMI on OMAP4. The complete implementation, > DSS and ASoC parts, is available at: > git://gitorious.org/omap-audio/linux-audio.git ricardon/topic/hdmi-audio-v1 > > Verification: Penguins on HDMI display with audio playback with sample > rates of 32, 44.1 and 48kHz and 16-bit and 24-bit (in 32-bit word) sample > format. Audio playback verified using ALSA aplay. Validation was performed on > SDP4430 ES2.1 and Panda ES2.1 and ES2.0. > > Ricardo Neri (5): > OMAP4: DSS2: Create a DSS features structure for OMAP4430 ES1.0 > OMAP4: DSS2: HDMI: Add DSS feature for CTS calculation > OMAP4: DSS2: HDMI: Add enums and structures for audio > OMAP4: DSS2: HDMI: Add functionality for audio configuration > OMAP4: DSS2: HDMI: Implement ASoC Codec driver for HDMI audio > > drivers/video/omap2/dss/dss_features.c | 29 ++- > drivers/video/omap2/dss/dss_features.h | 1 + > drivers/video/omap2/dss/hdmi.c | 432 ++++++++++++++++++++++++++++++++ > drivers/video/omap2/dss/hdmi.h | 220 ++++++++++++++++- > 4 files changed, 678 insertions(+), 4 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
