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8ad8e02c2f
Turns out the commit3a0681c744("mmc: core: do not retry CMD6 in __mmc_switch()") breaks initialization of a Toshiba THGBMNG5 eMMC card, when using the meson-gx-mmc.c driver on a custom board based on Amlogic A113D. The CMD6 that switches the card into HS200 mode is then one that fails and according to the below printed messages from the log: [ 1.648951] mmc0: mmc_select_hs200 failed, error -84 [ 1.648988] mmc0: error -84 whilst initialising MMC card After some analyze, it turns out that adding a delay of ~5ms inside mmc_select_bus_width() but after mmc_compare_ext_csds() has been executed, also fixes the problem. Adding yet some more debug code, trying to figure out if potentially the card could be in a busy state, both by using CMD13 and ->card_busy() ops concluded that this was not the case. Therefore, let's simply revert the commit that dropped support for retrying of CMD6, as this also fixes the problem. Fixes:3a0681c744("mmc: core: do not retry CMD6 in __mmc_switch()") Cc: stable@vger.kernel.org Signed-off-by: Jan Kaisrlik <ja.kaisrlik@gmail.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.