forked from luck/tmp_suning_uos_patched
7faa26c1bb
Tegra HDA has FIFO size which can hold upto 10 audio frames to support DVFS. When HDA DMA RUN bit is set to 0 to stop the stream, the DMA RUN bit will be cleared to 0 only after transferring all the remaining audio frames queued up in the fifo. This is not in sync with spec which states the controller will stop transmitting(output) in the beginning of the next frame for the relevant stream. The above behavior with Tegra HDA was resulting in machine check error during the system suspend flow with active audio playback with below kernel error logs. [ 33.524583] mc-err: [mcerr] (hda) csr_hdar: EMEM address decode error [ 33.531088] mc-err: [mcerr] status = 0x20000015; addr = 0x00000000 [ 33.537431] mc-err: [mcerr] secure: no, access-type: read, SMMU fault: none This was due to the fifo has more than one audio frame when the DMA RUN bit is set to 0 during system suspend flow and the timeout handling in snd_hdac_stream_sync() was not designed to handle this scenario. So the DMA will continue running even after timeout hit until all remaining audio frames in the fifo are transferred, but the suspend flow will try to reset the controller and turn off the hda clocks without the knowledge of the DMA is still running and could result in mc-err. The above issue can be resolved by doing stream reset with the help of snd_hdac_stream_reset() which would ensure the DMA RUN bit is cleared if the timeout was hit in snd_hdac_stream_sync(). Signed-off-by: Mohan Kumar <mkumard@nvidia.com> Link: https://lore.kernel.org/r/20200128051508.26064-1-mkumard@nvidia.com Signed-off-by: Takashi Iwai <tiwai@suse.de> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.