[PATCH 09/11] sdhci: Add quirk for controllers that need IRQre-init after reset

From: Anton Vorontsov
Date: Thu Mar 05 2009 - 15:31:38 EST


FSL eSDHC controllers losing signal/interrupt enable states after
reset, so we should re-enable them.

Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 7 +++++++
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 4382f53..f012e7e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -189,6 +189,7 @@ static void sdhci_disable_card_detection(struct sdhci_host *host)
static void sdhci_reset(struct sdhci_host *host, u8 mask)
{
unsigned long timeout;
+ u32 uninitialized_var(ier);

if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
if (!(sdhci_readl(host, SDHCI_PRESENT_STATE) &
@@ -196,6 +197,9 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask)
return;
}

+ if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
+ ier = sdhci_readl(host, SDHCI_INT_ENABLE);
+
sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);

if (mask & SDHCI_RESET_ALL)
@@ -215,6 +219,9 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask)
timeout--;
mdelay(1);
}
+
+ if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
+ sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier);
}

static void sdhci_init(struct sdhci_host *host)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 8c41667..35c78bc 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -220,6 +220,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_NONSTANDARD_CLOCK (1<<17)
/* Controller does not like fast PIO transfers */
#define SDHCI_QUIRK_PIO_NEEDS_DELAY (1<<18)
+/* Controller losing signal/interrupt enable states after reset */
+#define SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET (1<<19)

int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */
--
1.5.6.5

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