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rockchip: spi: add debug message for delay in CS toggle

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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.tomsich@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich 2019-02-03 16:17:26 +01:00
parent 4abf5d0c02
commit f92cf0adca
1 changed files with 7 additions and 2 deletions
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9
drivers/spi/rk_spi.c
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@ -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);