[PATCH v4 0/3]mmc: enable TRIM/ERASE caps for SDHCI host

[Chuanxiao Dong]

Hi Chris,
   These patches enable TRIM/ERASE capability for SDHCI host controller.

   patch001: mmc: set max_discard_sectors value for mmc queue
   Rightnow max_discard_sectors value for mmc queue is UINT_MAX which means
   block layer can accept unlimited sectors to erase at one time. But this may
   delay some other important I/O requests. So set a suitable value for
   max_discard_sectors value by using 'pref_erase'

   patch0002: mmc: enable TRIM/ERASE capability for SDHCI host.
   ERASE command needs R1B response, so before sending command, SDHCI host
   driver also need to set timeout control register for such command

   patch0003: mmc: fix division by zero when calculate erase timeout
   when enable clock gating feature, host clock may be zero when calculate erase
   timeout value and this will cause division by zero bug.

Thanks
Chuanxiao
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