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| author | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2019-02-03 16:17:26 +0100 |
|---|---|---|
| committer | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2019-05-01 00:00:04 +0200 |
| commit | f92cf0adcacf85622d9ce58647d8ce6a9b95d624 (patch) | |
| tree | be703d78b67dc628c28d646e103007475c714c91 /drivers/spi | |
| parent | 4abf5d0c02f7b12e2cacd5d211e3ce863b0ec92c (diff) | |
| download | u-boot-f92cf0adcacf85622d9ce58647d8ce6a9b95d624.tar.gz u-boot-f92cf0adcacf85622d9ce58647d8ce6a9b95d624.tar.xz u-boot-f92cf0adcacf85622d9ce58647d8ce6a9b95d624.zip | |
rockchip: spi: add debug message for delay in CS toggle
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/rk_spi.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/spi/rk_spi.c b/drivers/spi/rk_spi.c index 14437c0a9a..41532403a4 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); |