diff options
Diffstat (limited to 'drivers/spi/spi-rockchip.c')
| -rw-r--r-- | drivers/spi/spi-rockchip.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 1026e180eed7..0f89c2169c24 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -142,6 +142,12 @@ /* sclk_out: spi master internal logic in rk3x can support 50Mhz */ #define MAX_SCLK_OUT 50000000 +/* + * SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However, + * the controller seems to hang when given 0x10000, so stick with this for now. + */ +#define ROCKCHIP_SPI_MAX_TRANLEN 0xffff + enum rockchip_ssi_type { SSI_MOTO_SPI = 0, SSI_TI_SSP, @@ -573,6 +579,11 @@ static void rockchip_spi_config(struct rockchip_spi *rs) dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div); } +static size_t rockchip_spi_max_transfer_size(struct spi_device *spi) +{ + return ROCKCHIP_SPI_MAX_TRANLEN; +} + static int rockchip_spi_transfer_one( struct spi_master *master, struct spi_device *spi, @@ -589,6 +600,11 @@ static int rockchip_spi_transfer_one( return -EINVAL; } + if (xfer->len > ROCKCHIP_SPI_MAX_TRANLEN) { + dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len); + return -EINVAL; + } + rs->speed = xfer->speed_hz; rs->bpw = xfer->bits_per_word; rs->n_bytes = rs->bpw >> 3; @@ -730,6 +746,7 @@ static int rockchip_spi_probe(struct platform_device *pdev) master->prepare_message = rockchip_spi_prepare_message; master->unprepare_message = rockchip_spi_unprepare_message; master->transfer_one = rockchip_spi_transfer_one; + master->max_transfer_size = rockchip_spi_max_transfer_size; master->handle_err = rockchip_spi_handle_err; rs->dma_tx.ch = dma_request_chan(rs->dev, "tx"); @@ -894,9 +911,12 @@ static const struct dev_pm_ops rockchip_spi_pm = { }; static const struct of_device_id rockchip_spi_dt_match[] = { + { .compatible = "rockchip,rk3036-spi", }, { .compatible = "rockchip,rk3066-spi", }, { .compatible = "rockchip,rk3188-spi", }, + { .compatible = "rockchip,rk3228-spi", }, { .compatible = "rockchip,rk3288-spi", }, + { .compatible = "rockchip,rk3368-spi", }, { .compatible = "rockchip,rk3399-spi", }, { }, }; |