Subject: [PATCH 2/2] mmc: atmel-mci: AP700x PDC is not connected to MCI

From: [email-masked] (Hein Tibosch)
Date: Mon, 27 Aug 2012 04:22:02 +0800

Earlier, atmel-mci was adapter to make use of the peripheral DMA
controller (PDC), in case normal DMA wouldn't work.
( http://comments.gmane.org/gmane.linux.kernel.mmc/9403 )
This works OK on ARM platforms (AT91), but it broke the driver
for AVR32, the AP700x.
This patch makes the use of PDC depend on CONFIG_AVR32

Signed-off-by: Hein Tibosch <[email-masked]>

---
 drivers/mmc/host/atmel-mci-regs.h |    7 +++++++
 drivers/mmc/host/atmel-mci.c      |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)
 
diff --git a/drivers/mmc/host/atmel-mci-regs.h b/drivers/mmc/host/atmel-mci-regs.h
index ab56f7d..c97001e 100644
--- a/drivers/mmc/host/atmel-mci-regs.h
+++ b/drivers/mmc/host/atmel-mci-regs.h
@@ -140,6 +140,13 @@
 #define atmci_writel(port,reg,value)			\
 	__raw_writel((value), (port)->regs + reg)
 
+/* On AVR chips the Peripheral DMA Controller is not connected to MCI. */
+#ifdef CONFIG_AVR32
+#	define ATMCI_PDC_CONNECTED	0
+#else
+#	define ATMCI_PDC_CONNECTED	1
+#endif
+
 /*
  * Fix sconfig's burst size according to atmel MCI. We need to convert them as:
  * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 66e9fdc..702ab5c 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -2205,7 +2205,7 @@ static void __init atmci_get_cap(struct atmel_mci *host)
 			"version: 0x%x\n", version);
 
 	host->caps.has_dma_conf_reg = 0;
-	host->caps.has_pdc = 1;
+	host->caps.has_pdc = ATMCI_PDC_CONNECTED;
 	host->caps.has_cfg_reg = 0;
 	host->caps.has_cstor_reg = 0;
 	host->caps.has_highspeed = 0;
-- 
1.7.8.0