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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>
This commit is contained in:
Damien Le Moal 2022-03-01 10:35:43 +00:00 committed by Leo Yu-Chi Liang
parent 530f29cba5
commit 40b6435a62
1 changed files with 15 additions and 1 deletions
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16
drivers/spi/designware_spi.c
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@ -194,6 +194,20 @@ static int dw_spi_apb_init(struct udevice *bus, struct dw_spi_priv *priv)
return 0; 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) static int dw_spi_dwc_init(struct udevice *bus, struct dw_spi_priv *priv)
{ {
priv->max_xfer = 32; 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-spi", .data = (ulong)dw_spi_apb_init },
{ .compatible = "altr,socfpga-arria10-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 = "canaan,k210-ssi", .data = (ulong)dw_spi_dwc_init },
{ .compatible = "intel,stratix10-spi", .data = (ulong)dw_spi_apb_init }, { .compatible = "intel,stratix10-spi", .data = (ulong)dw_spi_apb_init },
{ .compatible = "intel,agilex-spi", .data = (ulong)dw_spi_apb_init }, { .compatible = "intel,agilex-spi", .data = (ulong)dw_spi_apb_init },