[PATCH 0/5] mmc: sdhci: Reduce maximum time under spinlock in sdhci_send_command()

[Adrian Hunter <adrian.hunter@xxxxxxxxx>]

Hi

Here are some patches to reduce maximum time under spinlock in
sdhci_send_command(), but also pave the way for an atomic request
function.

I haven't tried it, but with these patches, something like below
should work.



static int sdhci_atomic_request(struct mmc_host *mmc,
				struct mmc_request *mrq)
{
	struct sdhci_host *host = mmc_priv(mmc);
	struct mmc_command *cmd;
	unsigned long flags;
	int ret = 0;

	spin_lock_irqsave(&host->lock, flags);

	if (sdhci_present_error(host, mrq->cmd, true))
		goto out_finish;

	cmd = sdhci_manual_cmd23(host, mrq) ? mrq->sbc : mrq->cmd;

	if (sdhci_send_command(host, cmd))
		sdhci_led_activate(host);
	else
		ret = -EBUSY;

	spin_unlock_irqrestore(&host->lock, flags);

	return ret;

out_finish:
	sdhci_finish_mrq(host, mrq);
	spin_unlock_irqrestore(&host->lock, flags);
	return 0;
}



Adrian Hunter (5):
      mmc: sdhci: Add helpers for the auto-CMD23 flag
      mmc: sdhci: Stop exporting sdhci_send_command()
      mmc: sdhci: Remove unneeded forward declaration of sdhci_finish_data()
      mmc: sdhci: Tidy sdhci_request() a bit
      mmc: sdhci: Reduce maximum time under spinlock in sdhci_send_command()

 drivers/mmc/host/sdhci.c | 182 +++++++++++++++++++++++++++++++++++------------
 drivers/mmc/host/sdhci.h |   2 +-
 2 files changed, 139 insertions(+), 45 deletions(-)



Regards
Adrian