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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: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2018-12-11 15:10:42 +02:00 committed by Ulf Hansson
parent c8073e5285
commit bd29f58bc0
2 changed files with 14 additions and 0 deletions
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12
drivers/mmc/host/sdhci.c
View File

@ -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);
}

2
drivers/mmc/host/sdhci.h
View File

@ -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 */