BCM6328 controller has a margin of 20ms per blink step, which means that we
can only set it to 20, 40, 60 ... 1260 ms (0x3f * 20ms).
However, when checking if delay_on == delay_off, we were not considering the
case when the user had set delay_on=20 and delay_off=21, since this will
cause the driver to fallback to software blinking.
This update fixes this issue and improves blink steps by rounding them
in a more sensible way. Now 30-49ms is rounded to 40 ms, and previous behaviour
implied 40-59ms being rounded to 40 ms.
Signed-off-by: Álvaro Fernández Rojas <noltari@xxxxxxxxx>
---
drivers/leds/leds-bcm6328.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/leds/leds-bcm6328.c b/drivers/leds/leds-bcm6328.c
index 47f7c9f..0d4d274 100644
--- a/drivers/leds/leds-bcm6328.c
+++ b/drivers/leds/leds-bcm6328.c
@@ -140,6 +140,16 @@ static void bcm6328_led_set(struct led_classdev *led_cdev,
spin_unlock_irqrestore(led->lock, flags);
}
+static unsigned long bcm6328_blink_delay(unsigned long delay)
+{
+ unsigned long bcm6328_delay;
+ bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2;
+ bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS;
+ if (bcm6328_delay == 0)
+ bcm6328_delay = 1;
+ return bcm6328_delay;
+}
+
static int bcm6328_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on, unsigned long *delay_off)
{
@@ -153,16 +163,14 @@ static int bcm6328_blink_set(struct led_classdev *led_cdev,
if (!*delay_off)
*delay_off = BCM6328_LED_DEF_DELAY;
- if (*delay_on != *delay_off) {
+ delay = bcm6328_blink_delay(*delay_on);
+ if (delay != bcm6328_blink_delay(*delay_off)) {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay_on != delay_off)\n");
return -EINVAL;
}
- delay = *delay_on / BCM6328_LED_INTERVAL_MS;
- if (delay == 0) {
- delay = 1;
- } else if (delay > BCM6328_LED_INTV_MASK) {
+ if (delay > BCM6328_LED_INTV_MASK) {
dev_dbg(led_cdev->dev,
"fallback to soft blinking (delay > %ums)\n",
BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-leds" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
