adds quirk for controllers whose clock divider zero is broken,
sdhci_set_clock function will incorporate this modification.
Signed-off-by: Suneel Garapati <suneel.garap...@xilinx.com>
---
drivers/mmc/host/sdhci.c | 4 ++++
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 1b4861d..087327e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1210,6 +1210,10 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned
int clock)
}
real_div = div;
div >>= 1;
+ if ((host->quirks2 & SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN)
+ && !div && host->max_clk <= 25000000) {
+ div = 1;
+ }
}
} else {
/* Version 2.00 divisors must be a power of 2. */
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 5521d29..67046ca 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -409,6 +409,8 @@ struct sdhci_host {
#define SDHCI_QUIRK2_SUPPORT_SINGLE (1<<13)
/* Controller broken with using ACMD23 */
#define SDHCI_QUIRK2_ACMD23_BROKEN (1<<14)
+/* Broken Clock divider zero in controller */
+#define SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN (1<<15)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
--
2.1.2
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
