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 <[email protected]>
---
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 f4573a9..08b49d2 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)
--
1.5.6.5