[PATCH 4/4] mmc: omap_hsmmc: switch to 1-bit before stopping clocks.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Make use of the new mmc_sdio_want_no_clocks() call to avoid stopping
clocks while SD Card interrupts are enabled and we aren't in
1-bit mode.

Also stop clocks immediately in omap_hsmmc_disable_fclk() if
1-bit mode has been entered for this purpose.

With this, I can use my libertas wifi with a 4-bit bus, with
interrupts and runtime power-management enabled, and get around
14Mb/sec throughput (which is the best I've seen).

Signed-off-by: NeilBrown <neil@xxxxxxxxxx>
---
 drivers/mmc/host/omap_hsmmc.c |   13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index f84cfb01716d..14fce3b92633 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1791,9 +1791,12 @@ static int omap_hsmmc_disable_fclk(struct mmc_host *mmc)
 {
 	struct omap_hsmmc_host *host = mmc_priv(mmc);
 
-	pm_runtime_mark_last_busy(host->dev);
-	pm_runtime_put_autosuspend(host->dev);
-
+	if (atomic_read(&mmc->sdio_narrowed) == 2)
+		pm_runtime_put_sync(host->dev);
+	else {
+		pm_runtime_mark_last_busy(host->dev);
+		pm_runtime_put_autosuspend(host->dev);
+	}
 	return 0;
 }
 
@@ -2311,6 +2314,10 @@ static int omap_hsmmc_runtime_suspend(struct device *dev)
 	spin_lock_irqsave(&host->irq_lock, flags);
 	if ((host->mmc->caps & MMC_CAP_SDIO_IRQ) &&
 	    (host->flags & HSMMC_SDIO_IRQ_ENABLED)) {
+		if (mmc_sdio_want_no_clocks(host->mmc) == 0) {
+			ret = -EBUSY;
+			goto abort;
+		}
 		/* disable sdio irq handling to prevent race */
 		OMAP_HSMMC_WRITE(host->base, ISE, 0);
 		OMAP_HSMMC_WRITE(host->base, IE, 0);


--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux