diff options
Diffstat (limited to 'drivers/spi/spi-s3c64xx.c')
| -rw-r--r-- | drivers/spi/spi-s3c64xx.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 5f59d6f8c8d8..38cc2068afce 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -561,11 +561,18 @@ static int s3c64xx_wait_for_pio(struct s3c64xx_spi_driver_data *sdd, u32 cpy_len; u8 *buf; int ms; + unsigned long time_us; - /* millisecs to xfer 'len' bytes @ 'cur_speed' */ - ms = xfer->len * 8 * 1000 / sdd->cur_speed; + /* microsecs to xfer 'len' bytes @ 'cur_speed' */ + time_us = (xfer->len * 8 * 1000 * 1000) / sdd->cur_speed; + ms = (time_us / 1000); ms += 10; /* some tolerance */ + /* sleep during signal transfer time */ + status = readl(regs + S3C64XX_SPI_STATUS); + if (RX_FIFO_LVL(status, sdd) < xfer->len) + usleep_range(time_us / 2, time_us); + val = msecs_to_loops(ms); do { status = readl(regs + S3C64XX_SPI_STATUS); |