[PATCH 1/1] mmc: Fix mmc_switch excessive timeout

Marek Behún marek.behun at nic.cz
Thu Oct 14 16:51:32 CEST 2021

Reviewed-by: Marek Behún <marek.behun at nic.cz>
Tested-by: Marek Behún <marek.behun at nic.cz>

This fixes a bug introduced in commit 3f4e52fc9d81
and it is incorrect. It caused the mmc initialization to take 4 seconds
(previously it was <0.1s).

The code in Linux also uses &&, and the comment says:
  If the host doesn't support HW polling via the ->card_busy() ops and
  when it's not allowed to poll by using CMD13, then we need to rely on
  waiting the stated timeout to be sufficient.

See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/mmc/core/mmc_ops.c?h=v5.15-rc5#n598

Peng, could we get this merged ASAP? :)


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