[PATCH 01/10] sdhci: Add quirk for controllers with no end-of-busy IRQ
Anton Vorontsov
avorontsov at ru.mvista.com
Thu Jan 22 12:59:17 EST 2009
From: Ben Dooks <ben-linux at fluff.org>
The Samsung SDHCI (and FSL eSDHC) controller block seems to fail
to generate an INT_DATA_END after the transfer has completed and
the bus busy state finished.
Changes in e809517f6fa5803a5a1cd56026f0e2190fc13d5c to use the
new busy method are the cause of the behaviour change.
Signed-off-by: Ben Dooks <ben-linux at fluff.org>
Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
---
drivers/mmc/host/sdhci.c | 5 ++++-
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 4d010a9..72cb7ef 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1286,8 +1286,11 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
if (host->cmd->data)
DBG("Cannot wait for busy signal when also "
"doing a data transfer");
- else
+ else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
return;
+
+ /* The controller does not support the end-of-busy IRQ,
+ * fall through and take the SDHCI_INT_RESPONSE */
}
if (intmask & SDHCI_INT_RESPONSE)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 31f4b15..73c03c6 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -210,6 +210,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_BROKEN_SMALL_PIO (1<<13)
/* Controller supports high speed but doesn't have the caps bit set */
#define SDHCI_QUIRK_FORCE_HIGHSPEED (1<<14)
+/* Controller does not provide transfer-complete interrupt when not busy */
+#define SDHCI_QUIRK_NO_BUSY_IRQ (1<<15)
int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */
--
1.5.6.5
More information about the Linuxppc-dev
mailing list