Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
---
drivers/mci/atmel_mci.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/mci/atmel_mci.c b/drivers/mci/atmel_mci.c
index d5fdd1d..bf0adb0 100644
--- a/drivers/mci/atmel_mci.c
+++ b/drivers/mci/atmel_mci.c
@@ -28,6 +28,7 @@
#include "atmel-mci-regs.h"
struct atmel_mci_caps {
+ bool has_rwproof;
bool has_odd_clk_div;
};
@@ -94,7 +95,13 @@ static void atmci_set_clk_rate(struct atmel_mci *host,
dev_dbg(host->hw_dev, "atmel_set_clk_rate: clkIn=%ld clkIos=%d divider=%d\n",
host->bus_hz, clock_min, clkdiv);
- host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF;
+ /*
+ * WRPROOF and RDPROOF prevent overruns/underruns by
+ * stopping the clock when the FIFO is full/empty.
+ * This state is not expected to last for long.
+ */
+ if (host->caps.has_rwproof)
+ host->mode_reg |= ATMCI_MR_RDPROOF | ATMCI_MR_WRPROOF;
atmci_writel(host, ATMCI_MR, host->mode_reg);
}
@@ -470,6 +477,7 @@ static void atmci_get_cap(struct atmel_mci *host)
case 0x400:
case 0x300:
case 0x200:
+ host->caps.has_rwproof = 1;
case 0x100:
case 0x0:
break;
--
1.7.10.4
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