spi: davinci: configure the invariable bits in spipc0 only once
Configure the data-in, data-out and clock functionality pins
in SPIPC0 register only once during probe. No need to set these
bits for each transfer.
Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c
index 45cc1a7..6f279c5 100644
--- a/drivers/spi/davinci_spi.c
+++ b/drivers/spi/davinci_spi.c
@@ -536,9 +536,6 @@
* optimize for both flags staying cleared.
*/
- op_mode = SPIPC0_DIFUN_MASK
- | SPIPC0_DOFUN_MASK
- | SPIPC0_CLKFUN_MASK;
if (!(spi->mode & SPI_NO_CS)) {
pdata = davinci_spi->pdata;
if (!pdata->chip_sel ||
@@ -886,6 +883,7 @@
resource_size_t dma_tx_chan = SPI_NO_RESOURCE;
resource_size_t dma_eventq = SPI_NO_RESOURCE;
int i = 0, ret = 0;
+ u32 spipc0;
pdata = pdev->dev.platform_data;
if (pdata == NULL) {
@@ -1028,6 +1026,10 @@
udelay(100);
iowrite32(1, davinci_spi->base + SPIGCR0);
+ /* Set up SPIPC0. CS and ENA init is done in davinci_spi_bufs_prep */
+ spipc0 = SPIPC0_DIFUN_MASK | SPIPC0_DOFUN_MASK | SPIPC0_CLKFUN_MASK;
+ iowrite32(spipc0, davinci_spi->base + SPIPC0);
+
/* initialize chip selects */
if (pdata->chip_sel) {
for (i = 0; i < pdata->num_chipselect; i++) {