diff options
| author | Simon Glass <sjg@chromium.org> | 2016-11-13 14:22:03 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-11-25 17:59:30 -0700 |
| commit | b42524744d3c7ca015ec7702f3420104539491ac (patch) | |
| tree | 88c5b68e6f36504f864372a5d7a1982744250058 | |
| parent | 6e019c4f288c269c492d732b6b101bde2ca9cc44 (diff) | |
rockchip: spi: Honour the deactivation delay
This is not currently implemented. Add support for this so that the Chrome
OS EC can be used on jerry.
Signed-off-by: Simon Glass <sjg@chromium.org>
| -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 8d64249385..15cf0bda20 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) |