Commit 18d20046 authored Mar 11, 2020 by Ulf Hansson

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>

parent d2f8bfa4

drivers/mmc/core/mmc.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -1910,9 +1910,12 @@ static int mmc_sleep(struct mmc_host *host)
		* If the max_busy_timeout of the host is specified, validate it against
		* the sleep cmd timeout. A failure means we need to prevent the host
		* from doing hw busy detection, which is done by converting to a R1
		* response instead of a R1B.
		* response instead of a R1B. Note, some hosts requires R1B, which also
		* means they are on their own when it comes to deal with the busy
		* timeout.
		*/
		if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
		if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) && host->max_busy_timeout &&
		(timeout_ms > host->max_busy_timeout)) {
		cmd.flags = MMC_RSP_R1 \| MMC_CMD_AC;
		} else {
		cmd.flags = MMC_RSP_R1B \| MMC_CMD_AC;

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