From: "Lad, Prabhakar" prabhakar.csengg@gmail.com
During spi transfer, for example: sspi 1:1.0 8 ff
the rx_len values will be: rx_len = 0 rx_len = 4294967295
This caused a busy looping during xfer, this patch fixes it by adding a check while reading the rx fifo
Signed-off-by: Lad, Prabhakar prabhakar.csengg@gmail.com Cc: Michal Simek michal.simek@xilinx.com Cc: Siva Durga Prasad Paladugu sivadur@xilinx.com Cc: Jagan Teki jteki@openedev.com --- Changes for v2: None
drivers/spi/zynq_spi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/spi/zynq_spi.c b/drivers/spi/zynq_spi.c index 09ae1be..dd3de27 100644 --- a/drivers/spi/zynq_spi.c +++ b/drivers/spi/zynq_spi.c @@ -230,7 +230,7 @@ static int zynq_spi_xfer(struct udevice *dev, unsigned int bitlen,
/* Read the data from RX FIFO */ status = readl(®s->isr); - while (status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) { + while ((status & ZYNQ_SPI_IXR_RXNEMPTY_MASK) && rx_len) { buf = readl(®s->rxdr); if (rx_buf) *rx_buf++ = buf;