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@xxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 12 ++++++++++++
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 14 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 281683c93de6..5de845b6b4d0 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -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);
}
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index a306d2fa972f..6cc9a3c2ac66 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -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 */
--
2.17.1
