In analysing delays introduced for large SPI reads, the absence of any
indication when a delay was inserted (to ensure the CS toggling is
observed by devices) became apparent.
Add an additional debug-only debug message to record the insertion and
duration of any delay (note that the debug-message will cause a delay
on-top of the delay-duration).
Signed-off-by: Philipp Tomsich <philipp.toms...@theobroma-systems.com>
---
drivers/spi/rk_spi.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/rk_spi.c b/drivers/spi/rk_spi.c
index 14437c0..4153240 100644
--- a/drivers/spi/rk_spi.c
+++ b/drivers/spi/rk_spi.c
@@ -130,8 +130,13 @@ static void spi_cs_activate(struct udevice *dev, uint cs)
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);
+ if (delay_us < plat->deactivate_delay_us) {
+ ulong additional_delay_us =
+ plat->deactivate_delay_us - delay_us;
+ debug("%s: delaying by %ld us\n",
+ __func__, additional_delay_us);
+ udelay(additional_delay_us);
+ }
}
debug("activate cs%u\n", cs);
--
2.1.4
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