Hi NXP,
Please consider the patch below for linux-imx. I tested this on branch lf-6.6.52-2.2.0 (imx8mm/imx8mn hardware), but it also applies on older branches.
When switching DDR frequency, the busfreq driver will always make a print to the kernel log buffer via printk().
In a use case where the DDR frequency switches often, this leads to spamming the log buffer.
We encountered this exact case, and all other messages from the dmesg buffer are pushed out as a consequence.
Using pr_debug() will depend on the definition of DEBUG and will not spam dmesg by default.
diff --git a/drivers/soc/imx/busfreq-imx8mq.c b/drivers/soc/imx/busfreq-imx8mq.c
index 5e36962285ef..9914d19183be 100644
--- a/drivers/soc/imx/busfreq-imx8mq.c
+++ b/drivers/soc/imx/busfreq-imx8mq.c
@@ -205,9 +205,9 @@ static void reduce_bus_freq(void)
}
if (audio_bus_freq_mode)
- printk(KERN_DEBUG "ddrc freq set to audio bus mode\n");
+ pr_debug("ddrc freq set to audio bus mode\n");
if (low_bus_freq_mode)
- printk(KERN_DEBUG "ddrc freq set to low bus mode\n");
+ pr_debug("ddrc freq set to low bus mode\n");
}
static void reduce_bus_freq_handler(struct work_struct *work)
@@ -296,7 +296,7 @@ static int set_high_bus_freq(int high_bus_freq)
cur_bus_freq_mode = BUS_FREQ_HIGH;
if (high_bus_freq_mode)
- printk(KERN_DEBUG "ddrc freq set to high bus mode\n");
+ pr_debug("ddrc freq set to high bus mode\n");
return 0;
}
