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path: root/drivers/spi/spi-omap2-mcspi.c
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Diffstat (limited to 'drivers/spi/spi-omap2-mcspi.c')
-rw-r--r--drivers/spi/spi-omap2-mcspi.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index ed4af4708d9a..443df39840bc 100644
--- 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);
@@ -1407,7 +1413,7 @@ static int omap2_mcspi_probe(struct platform_device *pdev)
if (status < 0)
goto disable_pm;
- status = spi_register_master(master);
+ status = devm_spi_register_master(&pdev->dev, master);
if (status < 0)
goto disable_pm;
@@ -1435,7 +1441,6 @@ static int omap2_mcspi_remove(struct platform_device *pdev)
pm_runtime_put_sync(mcspi->dev);
pm_runtime_disable(&pdev->dev);
- spi_unregister_master(master);
kfree(dma_channels);
return 0;