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[ Upstream commit 94741eba63c23b0f1527b0ae0125e6b553bde10e ] Current code enables TCSR.TE and RCSR.RE together, and disable TCSR.TE and RCSR.RE together in trigger(), which only supports one operation mode: 1. Rx synchronous with Tx: TE is last enabled and first disabled Other operation mode need to be considered also: 2. Tx synchronous with Rx: RE is last enabled and first disabled. 3. Asynchronous mode: Tx and Rx are independent. So the enable TCSR.TE and RCSR.RE sequence and the disable sequence need to be refined accordingly for #2 and #3. There is slightly against what RM recommennds with this change. For example in Rx synchronous with Tx mode, case "aplay 1.wav; arecord 2.wav" enable TE before RE. But it should be safe to do so, judging by years of testing results. Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> Reviewed-by: Nicolin Chen <nicoleotsuka@gmail.com> Link: https://lore.kernel.org/r/20200805063413.4610-2-shengjiu.wang@nxp.com Signed-off-by: Mark Brown <broonie@kernel.org> Stable-dep-of: 269f399dc19f ("ASoC: fsl_sai: Disable bit clock with transmitter") Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.