summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/pinctrl/bcm/pinctrl-bcm2835.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index fa77165fab2c..b2dd278f18b1 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -917,12 +917,14 @@ static int bcm2835_pinconf_set(struct pinctrl_dev *pctldev,
bcm2835_gpio_wr(pc, GPPUD, arg & 3);
/*
- * Docs say to wait 150 cycles, but not of what. We assume a
- * 1 MHz clock here, which is pretty slow...
+ * BCM2835 datasheet say to wait 150 cycles, but not of what.
+ * But the VideoCore firmware delay for this operation
+ * based nearly on the same amount of VPU cycles and this clock
+ * runs at 250 MHz.
*/
- udelay(150);
+ udelay(1);
bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), BIT(bit));
- udelay(150);
+ udelay(1);
bcm2835_gpio_wr(pc, GPPUDCLK0 + (off * 4), 0);
} /* for each config */