]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
mmc: fixes for eMMC v4.5 discard operation
authorAdrian Hunter <adrian.hunter@intel.com>
Thu, 5 Apr 2012 11:45:47 +0000 (14:45 +0300)
committerChris Ball <cjb@laptop.org>
Sat, 21 Apr 2012 00:28:55 +0000 (20:28 -0400)
commit7194efb8f063ee3aa0cb50d9002348887e68ec10
tree0802a06a24a1937858a60ee1596f622efc9f1330
parent3b422e9c2c020a1137349c614da7f9c9761a0922
mmc: fixes for eMMC v4.5 discard operation

eMMC v4.5 discard operation is significantly different from the
existing trim operation because it is not guaranteed to work with
the new sanitize operation.  Consequently mmc_can_trim() is
separated from mmc_can_discard().

Also the new discard operation does not result in the sectors being
set to all-zeros, so discard_zeroes_data must not be set.

In addition, the new discard has the same timeout as trim, but from
v4.5 trim is defined to use the hc timeout.  The timeout calculation
is adjusted accordingly.

Fixes apply to linux 3.2 on.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: <stable@vger.kernel.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
drivers/mmc/card/queue.c
drivers/mmc/core/core.c