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71cfc92751
R-Car Gen3 cannot use correction error status with HS400. HS200: CMD and DAT signal timing are based on CLK signal. HS400: CMD signal is based on CLK. DAT signal is based on DS signal. In HS400, CMD signal is 200MHz(SDR). DAT signal is 200MHz(DDR). Center position of signal is different between CMD and DAT. TAP position should be adjusted to the center position of CMD signal. DAT sampling timing is adjusted by HS400 calibration circuit regardless of TAP position. Refer to renesas_sdhi_adjust_hs400mode_enable(). However, correction error status contains CMD and DAT status in HS400 (DAT signal is not masked in HS400). Therefore, correction error status cannot use in HS400. It means that auto correction cannot be uses in HS400. Manual correction can change to the correct TAP position by ignoring DAT correction error status and using only CMD correction status. Signed-off-by: Takeshi Saito <takeshi.saito.xv@renesas.com> [wsa: refactored patch from BSP] Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/20191217114034.13290-4-wsa+renesas@sang-engineering.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.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.