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Diffstat (limited to 'drivers/spi/spi-xilinx.c')
-rw-r--r--drivers/spi/spi-xilinx.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index bc7100b93dfc..63fedc49ae9c 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -271,6 +271,7 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
while (remaining_words) {
int n_words, tx_words, rx_words;
u32 sr;
+ int stalled;
n_words = min(remaining_words, xspi->buffer_size);
@@ -299,7 +300,17 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
/* Read out all the data from the Rx FIFO */
rx_words = n_words;
+ stalled = 10;
while (rx_words) {
+ if (rx_words == n_words && !(stalled--) &&
+ !(sr & XSPI_SR_TX_EMPTY_MASK) &&
+ (sr & XSPI_SR_RX_EMPTY_MASK)) {
+ dev_err(&spi->dev,
+ "Detected stall. Check C_SPI_MODE and C_SPI_MEMORY\n");
+ xspi_init_hw(xspi);
+ return -EIO;
+ }
+
if ((sr & XSPI_SR_TX_EMPTY_MASK) && (rx_words > 1)) {
xilinx_spi_rx(xspi);
rx_words--;
@@ -370,6 +381,7 @@ static int xilinx_spi_find_buffer_size(struct xilinx_spi *xspi)
}
static const struct of_device_id xilinx_spi_of_match[] = {
+ { .compatible = "xlnx,axi-quad-spi-1.00.a", },
{ .compatible = "xlnx,xps-spi-2.00.a", },
{ .compatible = "xlnx,xps-spi-2.00.b", },
{}