diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/rk_spi.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/spi/rk_spi.c b/drivers/spi/rk_spi.c index 8d64249..15cf0bd 100644 --- a/drivers/spi/rk_spi.c +++ b/drivers/spi/rk_spi.c @@ -110,6 +110,14 @@ static void spi_cs_activate(struct udevice *dev, uint cs) struct rockchip_spi_priv *priv = dev_get_priv(bus); struct rockchip_spi *regs = priv->regs; + /* If it's too soon to do another transaction, wait */ + if (plat->deactivate_delay_us && priv->last_transaction_us) { + ulong delay_us; /* The delay completed so far */ + delay_us = timer_get_us() - priv->last_transaction_us; + if (delay_us < plat->deactivate_delay_us) + udelay(plat->deactivate_delay_us - delay_us); + } + debug("activate cs%u\n", cs); writel(1 << cs, ®s->ser); if (plat->activate_delay_us) |