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Regressions for not being able to detect an eMMC HS DDR mode card has been reported for the sdhci-esdhc-imx driver, but potentially other sdhci variants may suffer from the similar problem. The commite173f8911f("mmc: core: Update CMD13 polling policy when switch to HS DDR mode"), is causing the problem. It seems that change moved one step to far, regarding changing the host's timing before polling for a busy card. To fix this, let's move back to the behaviour when the host's timing is updated after the polling, but before the switch status is fetched and validated. In cases when polling with CMD13, we keep validating the switch status at each attempt. However, to align with the other card busy detections mechanism, let's fetch and validate the switch status also after the host's timing is updated. Reported-by: Clemens Gruber <clemens.gruber@pqgruber.com> Reported-by: Gary Bisson <gary.bisson@boundarydevices.com> Fixes:e173f8911f("mmc: core: Update CMD13 polling policy when switch..") Cc: Shawn Lin <shawn.lin@rock-chips.com> Cc: Dong Aisheng <aisheng.dong@nxp.com> Cc: Haibo Chen <haibo.chen@nxp.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Tested-by: Clemens Gruber <clemens.gruber@pqgruber.com> Tested-by: Jagan Teki <jagan@amarulasolutions.com> Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com> Tested-by: Haibo Chen <haibo.chen@nxp.com> Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.