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-rw-r--r--drivers/spi/spi-dw-mmio.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index d0cc5bf4fa4e..17c06039a74d 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -222,6 +222,21 @@ static int dw_spi_keembay_init(struct platform_device *pdev,
return 0;
}
+static int dw_spi_canaan_k210_init(struct platform_device *pdev,
+ struct dw_spi_mmio *dwsmmio)
+{
+ /*
+ * The Canaan Kendryte K210 SoC DW apb_ssi v4 spi controller is
+ * documented to have a 32 word deep TX and RX FIFO, which
+ * spi_hw_init() detects. However, when the RX FIFO is filled up to
+ * 32 entries (RXFLR = 32), an RX FIFO overrun error occurs. Avoid this
+ * problem by force setting fifo_len to 31.
+ */
+ dwsmmio->dws.fifo_len = 31;
+
+ return 0;
+}
+
static int dw_spi_mmio_probe(struct platform_device *pdev)
{
int (*init_func)(struct platform_device *pdev,
@@ -335,6 +350,7 @@ static const struct of_device_id dw_spi_mmio_of_match[] = {
{ .compatible = "snps,dwc-ssi-1.01a", .data = dw_spi_dwc_ssi_init},
{ .compatible = "intel,keembay-ssi", .data = dw_spi_keembay_init},
{ .compatible = "microchip,sparx5-spi", dw_spi_mscc_sparx5_init},
+ { .compatible = "canaan,k210-spi", dw_spi_canaan_k210_init},
{ /* end of table */}
};
MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);