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For Mega/Mix enabled SoCs like MX7D and MX6SX, uSDHC will lost power in LP mode no matter whether the MMC_KEEP_POWER flag is set or not. This may cause state misalign between kernel and HW, especially for SDIO3.0 WiFi cards. e.g. SDIO WiFi driver usually will keep power during system suspend. And after resume, no card re-enumeration called. But the tuning state is lost due to Mega/Mix. Then CRC error may happen during next data transfer. So we should always fire a mmc_retune_needed() for such type SoC to tell MMC core retuning is needed for next data transfer. mmc: sdhci-esdhci-imx: retune needed for Mega/Mix enabled SoCs Signed-off-by: Haibo Chen <haibo.chen@nxp.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Link: https://lore.kernel.org/r/1582100563-20555-4-git-send-email-haibo.chen@nxp.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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.