mmc: atmel-mci: correct sg buffer size evaluation

Assuming that a sg buffer size is a page size is false so use sg_dma_len.
A 4096 bytes can be required with two 2048-bytes sg buffer.

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

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index c0a0659..96004c9 100644 (file)
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -608,7 +608,7 @@ static void atmci_pdc_set_single_buf(struct atmel_mci *host,
        }
 
        atmci_writel(host, pointer_reg, sg_dma_address(host->sg));
-       if (host->data_size <= PAGE_SIZE) {
+       if (host->data_size <= sg_dma_len(host->sg)) {
                if (host->data_size & 0x3) {
                        /* If size is different from modulo 4, transfer bytes */
                        atmci_writel(host, counter_reg, host->data_size);
@@ -620,8 +620,8 @@ static void atmci_pdc_set_single_buf(struct atmel_mci *host,
                host->data_size = 0;
        } else {
                /* We assume the size of a page is 32-bits aligned */
-               atmci_writel(host, counter_reg, PAGE_SIZE / 4);
-               host->data_size -= PAGE_SIZE;
+               atmci_writel(host, counter_reg, sg_dma_len(host->sg) / 4);
+               host->data_size -= sg_dma_len(host->sg);
                if (host->data_size)
                        host->sg = sg_next(host->sg);
        }
@@ -808,7 +808,6 @@ atmci_prepare_data_pdc(struct atmel_mci *host, struct mmc_data *data)
        /* Configure PDC */
        host->data_size = data->blocks * data->blksz;
        sg_len = dma_map_sg(&host->pdev->dev, data->sg, data->sg_len, dir);
-       BUG_ON(sg_len < host->data_size / PAGE_SIZE);
        if (host->data_size)
                atmci_pdc_set_both_buf(host,
                        ((dir == DMA_FROM_DEVICE) ? XFER_RECEIVE : XFER_TRANSMIT));