9cd06c93af
The SD host controller can process one request in the atomic context if the card is nonremovable, which means we can submit next request in the irq hard handler when using the MMC host software queue to reduce the latency. Thus this patch adds a new API request_atomic() for the host controller, as well as adding support for host software queue to submit a request by the new request_atomic() API. Moreover there is an unusual case that the card is busy when trying to send a command, and we can not polling the card status in interrupt context by using request_atomic() to dispatch requests. Thus we should queue a work to try again in the non-atomic context in case the host releases the busy signal later. Suggested-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Baolin Wang <baolin.wang7@gmail.com> Link: https://lore.kernel.org/r/a344e27e506cb2329073cbd5cf65e15cc3cbeba9.1586744073.git.baolin.wang7@gmail.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Bug: 156552982 (cherry picked from commit ea43849795c985cddf332a29882082c0992e1222 https://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git next) Change-Id: I46e71706ccb9762b61defd17c9928c24e190d450 Signed-off-by: Chunyan Zhang <zhang.lyra@gmail.com>