summaryrefslogtreecommitdiff
path: root/include/linux/mmc
diff options
context:
space:
mode:
authorBaolin Wang <baolin.wang7@gmail.com>2020-04-13 05:46:03 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2020-05-28 12:20:59 +0300
commit6db96e5810e0a6a345b7d78549de7676ae5b2662 (patch)
tree68ffebfbb396fc42d0ddc168f67411a1b32a2e0a /include/linux/mmc
parent845c939ee22943786a6eb1d13d03c77b19fcc2c8 (diff)
downloadlinux-6db96e5810e0a6a345b7d78549de7676ae5b2662.tar.xz
mmc: host: Introduce the request_atomic() for the host
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>
Diffstat (limited to 'include/linux/mmc')
-rw-r--r--include/linux/mmc/host.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c318fb5b6a94..d4a50e5dc111 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -92,6 +92,9 @@ struct mmc_host_ops {
int err);
void (*pre_req)(struct mmc_host *host, struct mmc_request *req);
void (*request)(struct mmc_host *host, struct mmc_request *req);
+ /* Submit one request to host in atomic context. */
+ int (*request_atomic)(struct mmc_host *host,
+ struct mmc_request *req);
/*
* Avoid calling the next three functions too often or in a "fast