SD spec v5.1 adds discard support. The flows and commands matches those in eMMC, Which leaves to set the appropriate discard arg in CMD38 if DISCARD_SUPPORT (b313) is set in the SD_STATUS register. We set this arg on card init: not in mmc_init_erase as one might expect but arbitrarily once the card indicated its discard support. This is because unlike erase, it doesn't really involve any logic, and we want to avoid the unnecessary complication. V2->v3: The first 2 patches in the series got accepted. Elaborate the changelog of some of the differences between discard and erase. Clean some inconsistency in arg checking in mmc_erase(). Add a patch to set the timeout for sd discard. V1->v2: In the first patch, assign the discard arg for SD cards as well to keep the code consistent. Rename "discard_arg" to "erase_arg", and elaborate the change log. Avri Altman (2): mmc: core: Add discard support to sd mmc: core: Add sd discard timeout drivers/mmc/core/core.c | 15 +++++++++++---- drivers/mmc/core/sd.c | 10 +++++++++- include/linux/mmc/sd.h | 1 + 3 files changed, 21 insertions(+), 5 deletions(-) -- 1.9.1
