c91843463e
Isolated initially to renesas_sdhi_internal_dmac [1], Ulf suggested adding MMC_CAP_ERASE to the TMIO mmc core: On Fri, Nov 15, 2019 at 10:27:25AM +0100, Ulf Hansson wrote: -- snip -- This test and due to the discussions with Wolfram and you in this thread, I would actually suggest that you enable MMC_CAP_ERASE for all tmio variants, rather than just for this particular one. In other words, set the cap in tmio_mmc_host_probe() should be fine, as it seems none of the tmio variants supports HW busy detection at this point. -- snip -- Testing on R-Car H3ULCB-KF doesn't reveal any issues (v5.4-rc7): root@rcar-gen3:~# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT mmcblk0 179:0 0 59.2G 0 disk <--- eMMC mmcblk0boot0 179:8 0 4M 1 disk mmcblk0boot1 179:16 0 4M 1 disk mmcblk1 179:24 0 30G 0 disk <--- SD card root@rcar-gen3:~# time blkdiscard /dev/mmcblk0 real 0m8.659s user 0m0.001s sys 0m1.920s root@rcar-gen3:~# time blkdiscard /dev/mmcblk1 real 0m1.176s user 0m0.001s sys 0m0.124s [1] https://lore.kernel.org/linux-renesas-soc/20191112134808.23546-1-erosca@de.adit-jv.com/ Cc: Wolfram Sang <wsa+renesas@sang-engineering.com> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Andrew Gabbasov <andrew_gabbasov@mentor.com> Originally-by: Harish Jenny K N <harish_kandiga@mentor.com> Suggested-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.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.