Hi,
This series adds missing hardware reset controls to I2S and AC97 drivers. Currently drivers happen to work properly because reset is implicitly deasserted by tegra-clk driver, but clk driver shouldn't touch the resets and we need to fix it because this breaks other Tegra drivers. Previously we fixed the resets of the AHUB and HDMI codec drivers, but turned out that we missed the I2C and AC97 drivers.
Thanks to Paul Fertser for testing the pending clk patches and finding that audio got broken on Tegra20 AC100 netbook because of the missing I2S reset.
Changelog:
v3: - Fixed reset stubs for !CONFIG_RESET_CONTROLLER.
v2: - After some more testing I found that I2S control logic doesn't require I2S clock to be enabled for resetting. Hence it's fine to have I2S to be reset by parent AHUB driver, so I dropped "tegra30: i2s: Add reset control" patch.
- While I was double-checking resets on Tegra30, I found that that Tegra30 I2S driver has a broken runtime PM which doesn't restore hardware state on resume and it's lost after AHUB RPM-resume. Thus, added this new patch "tegra30: i2s: Restore hardware state on runtime PM resume".
- Added new patches which switch AHUB driver to use reset-bulk API. I took the RFC patch from Philipp Zabel, fixed it and added devm_reset_control_bulk_optional_get_exclusive_released() that will be useful for further Tegra GPU patches. This is a minor improvement which makes code cleaner.
Dmitry Osipenko (4): ASoC: tegra20: ac97: Add reset control ASoC: tegra20: i2s: Add reset control ASoC: tegra30: i2s: Restore hardware state on runtime PM resume ASoC: tegra: ahub: Switch to use reset-bulk API
Philipp Zabel (1): reset: Add reset_control_bulk API
drivers/reset/core.c | 215 +++++++++++++++++++++++ include/linux/reset.h | 308 +++++++++++++++++++++++++++++++++ sound/soc/tegra/tegra20_ac97.c | 21 +++ sound/soc/tegra/tegra20_ac97.h | 1 + sound/soc/tegra/tegra20_i2s.c | 31 ++++ sound/soc/tegra/tegra20_i2s.h | 1 + sound/soc/tegra/tegra30_ahub.c | 104 ++++------- sound/soc/tegra/tegra30_ahub.h | 5 +- sound/soc/tegra/tegra30_i2s.c | 41 ++--- 9 files changed, 629 insertions(+), 98 deletions(-)