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Commit 889736a7 authored by Asutosh Das's avatar Asutosh Das
Browse files

mmc: core: Add deferred resume support to CQ 



Defer the resume of the device until a request actually
arrives, thus mandating the use of the device.

CRs-fixed: 987918
Change-Id: I41cf8908dd0f129c54b941c318e938ad7e9d36c9
Signed-off-by: default avatarAsutosh Das <asutoshd@codeaurora.org>
parent 859ba6e3

drivers/mmc/card/block.c

+4 −0
Original line number Diff line number Diff line
@@ -3477,6 +3477,10 @@ static int mmc_blk_cmdq_issue_rq(struct mmc_queue *mq, struct request *req) 


	mmc_get_card(card);



#ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME

	if (mmc_bus_needs_resume(card->host))

		mmc_resume_bus(card->host);

#endif

	if (!card->host->cmdq_ctx.active_reqs && mmc_card_doing_bkops(card)) {

		ret = mmc_cmdq_halt(card->host, true);

		if (ret)

drivers/mmc/core/core.c

+9 −0
Original line number Diff line number Diff line
@@ -2760,6 +2760,7 @@ static inline void mmc_bus_put(struct mmc_host *host) 
int mmc_resume_bus(struct mmc_host *host)

{

	unsigned long flags;

	int err = 0;



	if (!mmc_bus_needs_resume(host))

		return -EINVAL;
@@ -2775,6 +2776,14 @@ int mmc_resume_bus(struct mmc_host *host) 
		mmc_power_up(host, host->card->ocr);

		BUG_ON(!host->bus_ops->resume);

		host->bus_ops->resume(host);

		if (mmc_card_cmdq(host->card)) {

			err = mmc_cmdq_halt(host, false);

			if (err)

				pr_err("%s: %s: unhalt failed: %d\n",

				       mmc_hostname(host), __func__, err);

			else

				mmc_card_clr_suspended(host->card);

		}

	}



	if (host->bus_ops->detect && !host->bus_dead)