The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 43cc64e5221cc6741252b64bc4531dd1eefb733d Mon Sep 17 00:00:00 2001

From: Ulf Hansson ulf.hansson@linaro.org Date: Tue, 10 Mar 2020 14:43:00 +0100 Subject: [PATCH] mmc: core: Respect MMC_CAP_NEED_RSP_BUSY for erase/trim/discard

The busy timeout that is computed for each erase/trim/discard operation, can become quite long and may thus exceed the host->max_busy_timeout. If that becomes the case, mmc_do_erase() 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 Tested-by: Anders Roxell anders.roxell@linaro.org Tested-by: Sowjanya Komatineni skomatineni@nvidia.com Tested-by: Faiz Abbas faiz_abbas@ti.com Tested-By: Peter Geis pgwipeout@gmail.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index aa54d359dab7..a971c4bcc442 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1732,8 +1732,11 @@ static int mmc_do_erase(struct mmc_card *card, unsigned int from, * the erase operation does not exceed the max_busy_timeout, we should * use R1B response. Or we need to prevent the host from doing hw busy * detection, which is done by converting to a R1 response instead. + * Note, some hosts requires R1B, which also means they are on their own + * when it comes to deal with the busy timeout. */ - if (card->host->max_busy_timeout && + if (!(card->host->caps & MMC_CAP_NEED_RSP_BUSY) && + card->host->max_busy_timeout && busy_timeout > card->host->max_busy_timeout) { cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; } else {