mmc: core: Respect MMC_CAP_NEED_RSP_BUSY for eMMC sleep command
authorUlf Hansson <ulf.hansson@linaro.org>
Wed, 11 Mar 2020 09:20:36 +0000 (10:20 +0100)
committerUlf Hansson <ulf.hansson@linaro.org>
Thu, 12 Mar 2020 12:36:55 +0000 (13:36 +0100)
commit18d200460cd73636d4f20674085c39e32b4e0097
treec3f734f1a040de056a33da47a78c2c96683bd0db
parentd2f8bfa4bff5028bc40ed56b4497c32e05b0178f
mmc: core: Respect MMC_CAP_NEED_RSP_BUSY for eMMC sleep command

The busy timeout for the CMD5 to put the eMMC into sleep state, is specific
to the card. Potentially the timeout may exceed the host->max_busy_timeout.
If that becomes the case, mmc_sleep() converts from using an R1B response
to an R1 response, as to prevent the host from doing HW busy detection.

However, it has turned out that some hosts requires an R1B response no
matter what, so let's respect that via checking MMC_CAP_NEED_RSP_BUSY. Note
that, if the R1B gets enforced, the host becomes fully responsible of
managing the needed busy timeout, in one way or the other.

Suggested-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200311092036.16084-1-ulf.hansson@linaro.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
drivers/mmc/core/mmc.c