mmc: queue: bring discard_granularity/alignment into line with SCSI
SCSI defines discard alignment as the offset to the first optimal discard. In the case of SD/MMC, that is always zero which is the default. SCSI defines discard granularity as a hint of a optimal discard size. That is much better expressed by the MMC "preferred erase size" (pref_erase) field. Signed-off-by: NAdrian Hunter <adrian.hunter@intel.com> Signed-off-by: NChris Ball <cjb@laptop.org>
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