mmc: atmel-mci: fix burst/chunk size modification

The use of DMA slave config operation requires that the burst size
(aka chunk size) is specified through this interface.
Modify atmel-mci slave driver to use this specification on its side.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/atmel-mci-regs.h b/drivers/mmc/host/atmel-mci-regs.h
index 787aba1..ab56f7d 100644 (file)
--- a/drivers/mmc/host/atmel-mci-regs.h
+++ b/drivers/mmc/host/atmel-mci-regs.h
@@ -140,4 +140,18 @@
 #define atmci_writel(port,reg,value)                   \
        __raw_writel((value), (port)->regs + reg)
 
+/*
+ * Fix sconfig's burst size according to atmel MCI. We need to convert them as:
+ * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3.
+ *
+ * This can be done by finding most significant bit set.
+ */
+static inline unsigned int atmci_convert_chksize(unsigned int maxburst)
+{
+       if (maxburst > 1)
+               return fls(maxburst) - 2;
+       else
+               return 0;
+}
+
 #endif /* __DRIVERS_MMC_ATMEL_MCI_H__ */

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 456c077..f2c115e 100644 (file)
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -910,6 +910,7 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
        enum dma_data_direction         direction;
        enum dma_transfer_direction     slave_dirn;
        unsigned int                    sglen;
+       u32                             maxburst;
        u32 iflags;
 
        data->error = -EINPROGRESS;
@@ -943,17 +944,18 @@ atmci_prepare_data_dma(struct atmel_mci *host, struct mmc_data *data)
        if (!chan)
                return -ENODEV;
 
-       if (host->caps.has_dma)
-               atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(3) | ATMCI_DMAEN);
-
        if (data->flags & MMC_DATA_READ) {
                direction = DMA_FROM_DEVICE;
                host->dma_conf.direction = slave_dirn = DMA_DEV_TO_MEM;
+               maxburst = atmci_convert_chksize(host->dma_conf.src_maxburst);
        } else {
                direction = DMA_TO_DEVICE;
                host->dma_conf.direction = slave_dirn = DMA_MEM_TO_DEV;
+               maxburst = atmci_convert_chksize(host->dma_conf.dst_maxburst);
        }
 
+       atmci_writel(host, ATMCI_DMA, ATMCI_DMA_CHKSIZE(maxburst) | ATMCI_DMAEN);
+
        sglen = dma_map_sg(chan->device->dev, data->sg,
                        data->sg_len, direction);