In case of xspi work in busy condition, may send bytes failed.
once something wrong, spi controller did't work any more
My test found this situation appear in both of read/write process.
so when TX FIFO is full, add one byte delay before send data;
Signed-off-by: sxauwsk <sxau...@163.com>
Signed-off-by: guojian <guoj...@innoinstrument.net>
Signed-off-by: wangshikai <wangshi...@inno-instrument.cn>
---
drivers/spi/spi-cadence.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c
index 66ae055..9694042 100644
--- a/drivers/spi/spi-cadence.c
+++ b/drivers/spi/spi-cadence.c
@@ -315,9 +315,11 @@ static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi)
(xspi->tx_bytes > 0)) {
/* When xspi in busy condition, bytes may send failed,
- * caused communication failure so add one byte delay
+ * then spi control did't work thoroughly, add one byte delay
*/
- usleep_range(10, 20);
+ if (cdns_spi_read(xspi, CDNS_SPI_ISR_OFFSET) &
+ CDNS_SPI_IXR_TXFULL_MASK)
+ usleep_range(10, 20);
if (xspi->txbuf)
cdns_spi_write(xspi, CDNS_SPI_TXD, *xspi->txbuf++);
--
1.7.9.5
