[alsa-devel] [PATCH v3 0/9] ASoC: fsl-ssi: offline/online configuration and cleanups
mpa at pengutronix.de
Wed Dec 18 12:57:36 CET 2013
This patch series fixes some fsl-ssi code that does not act exactly as it is
described in the reference manuals.
The reference manuals before imx51 do mention that some register bits,
including TDMAE/RDMAE, should not be changed while the SSI unit is enabled
(SSIEN). At the same time the SDMA unit has a undefined request handling if
there are DMA requests before the SDMA engine and its channel is configured.
The reference manual states that SSI DMA requests are sent as soon as the FIFO
and the DMAE bits are enabled. It does not mention a dependency to SCR's TE/RE
To avoid sending DMA requests before a channel is configured, we have to
seperate the fsl-ssi behavior into offline and online configuration. SoCs
before imx51 have to use offline configuration while later SoC versions can use
This series adds support for online configuration and cleans up the
configuration register code especially in fsl_ssi_trigger. At the end we have a
seperation between enable/disable logic and the actual configuration register
values used to enable/disable TX/RX.
v3 adds another fixup for the interrupt stats. The interrupt handler currently
writes back a subset of the interrupt flags to clear the interrupts in the
status register. This is not implemented on every processor. For example imx27
does not allow writebacks, imx53 does not allow writeback of RFRC and TFRC. The
interrupt stats were disabled for imx by default. 'Fix interrupt mapping and
release' enables it for mx53 again and changes the writeback flags.
I tested this series on mx53.
The series is based on Mark Brown's topic/fsl branch.
Changes in v3:
- Rebase on latest topic/fsl
- Added patch to cleanup probe function error handling
- Fix interrupt stats for imx53
- Replace imx50-ssi by imx51-ssi
Markus Pargmann (9):
ASoC: fsl-ssi: Fix probe error handling
ASoC: fsl-ssi: Move sysfs stats to debugfs
ASoC: fsl-ssi: Add imx51-ssi and of_device_id matching
ASoC: fsl-ssi: Fix interrupt mapping and release
ASoC: fsl-ssi: Add offline_config flag
ASoC: fsl-ssi: Add configuration helper functions
ASoC: fsl-ssi: Move RX/TX configuration to seperate functions
ASoC: fsl-ssi: Drop ac97 specific trigger function
ARM: DTS: imx5* imx6*, use imx51-ssi
arch/arm/boot/dts/imx51.dtsi | 3 +-
arch/arm/boot/dts/imx53.dtsi | 10 +-
arch/arm/boot/dts/imx6qdl.dtsi | 12 +-
arch/arm/boot/dts/imx6sl.dtsi | 12 +-
sound/soc/fsl/fsl_ssi.c | 539 +++++++++++++++++++++++++++--------------
5 files changed, 387 insertions(+), 189 deletions(-)
More information about the Alsa-devel