diff options
| author | Damien Le Moal | 2022-03-01 10:35:43 +0000 |
|---|---|---|
| committer | Leo Yu-Chi Liang | 2022-03-15 17:43:11 +0800 |
| commit | 40b6435a62befe3e487b6ea0ff69a0206a907b0b (patch) | |
| tree | 41e261643fec37e1a4aed96fb1b9f0721894a38a /drivers/spi | |
| parent | 530f29cba55726a52d22adb762d4af41bf21bf02 (diff) | |
spi: dw: Force set K210 fifo length to 31
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.
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/designware_spi.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c index 9200efced96..f9b19a5ea44 100644 --- a/drivers/spi/designware_spi.c +++ b/drivers/spi/designware_spi.c @@ -194,6 +194,20 @@ static int dw_spi_apb_init(struct udevice *bus, struct dw_spi_priv *priv) return 0; } +static int dw_spi_apb_k210_init(struct udevice *bus, struct dw_spi_priv *priv) +{ + /* + * 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. + */ + priv->fifo_len = 31; + + return dw_spi_apb_init(bus, priv); +} + static int dw_spi_dwc_init(struct udevice *bus, struct dw_spi_priv *priv) { priv->max_xfer = 32; @@ -758,7 +772,7 @@ static const struct udevice_id dw_spi_ids[] = { */ { .compatible = "altr,socfpga-spi", .data = (ulong)dw_spi_apb_init }, { .compatible = "altr,socfpga-arria10-spi", .data = (ulong)dw_spi_apb_init }, - { .compatible = "canaan,k210-spi", .data = (ulong)dw_spi_apb_init }, + { .compatible = "canaan,k210-spi", .data = (ulong)dw_spi_apb_k210_init}, { .compatible = "canaan,k210-ssi", .data = (ulong)dw_spi_dwc_init }, { .compatible = "intel,stratix10-spi", .data = (ulong)dw_spi_apb_init }, { .compatible = "intel,agilex-spi", .data = (ulong)dw_spi_apb_init }, |