Merge remote-tracking branch 'spi/topic/bfin' into spi-next

[karo-tx-linux.git] / drivers / spi / spi-omap2-mcspi.c

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 2f7fd35a9ac8ae1ba353b865960425c1401b438d..443df39840bc899fb3525dcb141ed82da87d72f4 100644 (file)
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -276,7 +276,7 @@ static void omap2_mcspi_set_fifo(const struct spi_device *spi,
        struct omap2_mcspi_cs *cs = spi->controller_state;
        struct omap2_mcspi *mcspi;
        unsigned int wcnt;
-       int fifo_depth, bytes_per_word;
+       int max_fifo_depth, fifo_depth, bytes_per_word;
        u32 chconf, xferlevel;
 
        mcspi = spi_master_get_devdata(master);
@@ -287,7 +287,12 @@ static void omap2_mcspi_set_fifo(const struct spi_device *spi,
                if (t->len % bytes_per_word != 0)
                        goto disable_fifo;
 
-               fifo_depth = gcd(t->len, OMAP2_MCSPI_MAX_FIFODEPTH);
+               if (t->rx_buf != NULL && t->tx_buf != NULL)
+                       max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH / 2;
+               else
+                       max_fifo_depth = OMAP2_MCSPI_MAX_FIFODEPTH;
+
+               fifo_depth = gcd(t->len, max_fifo_depth);
                if (fifo_depth < 2 || fifo_depth % bytes_per_word != 0)
                        goto disable_fifo;
 
@@ -299,7 +304,8 @@ static void omap2_mcspi_set_fifo(const struct spi_device *spi,
                if (t->rx_buf != NULL) {
                        chconf |= OMAP2_MCSPI_CHCONF_FFER;
                        xferlevel |= (fifo_depth - 1) << 8;
-               } else {
+               }
+               if (t->tx_buf != NULL) {
                        chconf |= OMAP2_MCSPI_CHCONF_FFET;
                        xferlevel |= fifo_depth - 1;
                }
@@ -498,7 +504,7 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
                                ((u32 *)xfer->rx_buf)[elements++] = w;
                } else {
                        int bytes_per_word = mcspi_bytes_per_word(word_len);
-                       dev_err(&spi->dev, "DMA RX penultimate word empty");
+                       dev_err(&spi->dev, "DMA RX penultimate word empty\n");
                        count -= (bytes_per_word << 1);
                        omap2_mcspi_set_enable(spi, 1);
                        return count;
@@ -516,7 +522,7 @@ omap2_mcspi_rx_dma(struct spi_device *spi, struct spi_transfer *xfer,
                else /* word_len <= 32 */
                        ((u32 *)xfer->rx_buf)[elements] = w;
        } else {
-               dev_err(&spi->dev, "DMA RX last word empty");
+               dev_err(&spi->dev, "DMA RX last word empty\n");
                count -= mcspi_bytes_per_word(word_len);
        }
        omap2_mcspi_set_enable(spi, 1);