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All MAX98090 input clocks MCLK, LRCLK and BCLK must be running and stable before powering on the codec in slave mode. Otherwise the PLL may not lock to LRCLK causing silence in playback and capture. How often that happens is somewhat hardware and clock configuration specific. Now if wanting to follow strictly this clocks must be active before powering the codec on requirement we should have a notification from DAI driver to codec driver when clocks are activated and take codec out of shutdown only after that. Plus take care of possible active bypass paths. However, when PLL unlock occurs, MAX98090 asserts the PLL Unlock Flag which can be configured as an IRQ source. This allows to workaround around the issue by toggling the codec power shortly in case of PLL lock failure. In order to prevent needlessly toggling codec power in case of short PLL unlocks at the beginning of stream this patch implements delayed activation for PLL unlock interrupt. Then workaround is run only when the PLL doesn't lock at all. Power toggling workaround for PLL unlock comes originally from Liam Girdwood <liam.r.girdwood@linux.intel.com> and delayed activation from me. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org> |
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| aoa | ||
| arm | ||
| atmel | ||
| core | ||
| drivers | ||
| firewire | ||
| i2c | ||
| isa | ||
| mips | ||
| oss | ||
| parisc | ||
| pci | ||
| pcmcia | ||
| ppc | ||
| sh | ||
| soc | ||
| sparc | ||
| spi | ||
| synth | ||
| usb | ||
| ac97_bus.c | ||
| Kconfig | ||
| last.c | ||
| Makefile | ||
| sound_core.c | ||
| sound_firmware.c | ||