Commit bd29f58b authored by Adrian Hunter's avatar Adrian Hunter Committed by Ulf Hansson
Browse files

mmc: sdhci: Add quirk to disable LED control 



Host controllers may not have a LED signal line, whereas the register
updates to control the non-existent LED can be relatively time consuming.
Add a quirk to disable LED control.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent c8073e52

drivers/mmc/host/sdhci.c

+12 −0
Original line number Diff line number Diff line
@@ -349,6 +349,9 @@ static void __sdhci_led_activate(struct sdhci_host *host) 
{

	u8 ctrl;



	if (host->quirks & SDHCI_QUIRK_NO_LED)

		return;



	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);

	ctrl |= SDHCI_CTRL_LED;

	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
@@ -358,6 +361,9 @@ static void __sdhci_led_deactivate(struct sdhci_host *host) 
{

	u8 ctrl;



	if (host->quirks & SDHCI_QUIRK_NO_LED)

		return;



	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);

	ctrl &= ~SDHCI_CTRL_LED;

	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
@@ -387,6 +393,9 @@ static int sdhci_led_register(struct sdhci_host *host) 
{

	struct mmc_host *mmc = host->mmc;



	if (host->quirks & SDHCI_QUIRK_NO_LED)

		return 0;



	snprintf(host->led_name, sizeof(host->led_name),

		 "%s::", mmc_hostname(mmc));
@@ -400,6 +409,9 @@ static int sdhci_led_register(struct sdhci_host *host) 


static void sdhci_led_unregister(struct sdhci_host *host)

{

	if (host->quirks & SDHCI_QUIRK_NO_LED)

		return;



	led_classdev_unregister(&host->led);

}

drivers/mmc/host/sdhci.h

+2 −0
Original line number Diff line number Diff line
@@ -408,6 +408,8 @@ struct sdhci_host { 
#define SDHCI_QUIRK_INVERTED_WRITE_PROTECT		(1<<16)

/* Controller does not like fast PIO transfers */

#define SDHCI_QUIRK_PIO_NEEDS_DELAY			(1<<18)

/* Controller does not have a LED */

#define SDHCI_QUIRK_NO_LED				(1<<19)

/* Controller has to be forced to use block size of 2048 bytes */

#define SDHCI_QUIRK_FORCE_BLK_SZ_2048			(1<<20)

/* Controller cannot do multi-block transfers */

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