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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-06-18 16:49:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-19 16:46:04 -0700 |
| commit | fd8a11e100b463811f41266ea3880c830f3359ea (patch) | |
| tree | ad26d74766e03088b6c783ed12f312668d32dd74 /drivers/spi | |
| parent | 9e04b3336a90efef6a912501155f9880abf7b3c2 (diff) | |
| download | linux-stable-fd8a11e100b463811f41266ea3880c830f3359ea.tar.gz linux-stable-fd8a11e100b463811f41266ea3880c830f3359ea.tar.bz2 linux-stable-fd8a11e100b463811f41266ea3880c830f3359ea.zip | |
spi_mpc83xx: quieten down the "Requested speed is too low" message
When a platform is running at high frequencies it's not always possible to
scale-down a frequency to a requested value, and using mmc_spi driver this
leads to the following printk flood during card polling:
...
mmc_spi spi32766.0: Requested speed is too low: 400000 Hz. Will use
520828 Hz instead.
mmc_spi spi32766.0: Requested speed is too low: 400000 Hz. Will use
520828 Hz instead.
...
Fix this by using WARN_ONCE(), it's better than the flood, and also better
than turning dev_err() into dev_dbg(), since we actually want to warn that
some things may not work correctly.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: David Brownell <david-b@pacbell.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi_mpc83xx.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c index ce61be98e06d..4988230a7e0c 100644 --- a/drivers/spi/spi_mpc83xx.c +++ b/drivers/spi/spi_mpc83xx.c @@ -14,6 +14,7 @@ #include <linux/init.h> #include <linux/types.h> #include <linux/kernel.h> +#include <linux/bug.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/completion.h> @@ -275,12 +276,12 @@ int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) if ((mpc83xx_spi->spibrg / hz) > 64) { cs->hw_mode |= SPMODE_DIV16; pm = mpc83xx_spi->spibrg / (hz * 64); - if (pm > 16) { - dev_err(&spi->dev, "Requested speed is too " - "low: %d Hz. Will use %d Hz instead.\n", - hz, mpc83xx_spi->spibrg / 1024); + + WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " + "Will use %d Hz instead.\n", dev_name(&spi->dev), + hz, mpc83xx_spi->spibrg / 1024); + if (pm > 16) pm = 16; - } } else pm = mpc83xx_spi->spibrg / (hz * 4); if (pm) |