The following commit add Fifo support for omap mcspi.
commit d33f473dcd8e69321f001ba330d648f475b504c9
Author: Illia Smyrnov <illia.smyrnov@xxxxxx>
Date: Mon Jun 17 16:31:06 2013 +0300
spi: omap2-mcspi: Add FIFO buffer support
Currently, enabling of FIFO is done based on rx_buf or tx_buf checks
and only one of the RX or TX fifo is enabled. There can be transfers
in which both RX/TX fifo is desired. Hence, fixing code for the
same to allow setting both TX/RX fifo when needed.
Application:
While doing a loopback testing on beaglebone white(DMA
with FIFO enabled), where both RX and TX buf buffers are passed,
./spidev_test hangs.
The $subject patch fixes that hang and data can be loopbacked.
Signed-off-by: Sourav Poddar <sourav.poddar@xxxxxx>
---
drivers/spi/spi-omap2-mcspi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index ed4af47..86402a7 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -299,7 +299,9 @@ 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;
}
--
1.7.9.5
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