bcm63xx: bcm6328-leds: improve HW blinking

Add support for second HW blinking interval.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 137 insertions, 0 deletions

diff --git a/target/linux/bcm63xx/patches-5.4/120-leds-bcm6328-support-second-hw-blinking-interval.patch b/target/linux/bcm63xx/patches-5.4/120-leds-bcm6328-support-second-hw-blinking-interval.patch
new file mode 100644
index 0000000000..6ed26f2741
--- /dev/null
+++ b/target/linux/bcm63xx/patches-5.4/120-leds-bcm6328-support-second-hw-blinking-interval.patch
@@ -0,0 +1,137 @@
+--- a/drivers/leds/leds-bcm6328.c
++++ b/drivers/leds/leds-bcm6328.c
+@@ -24,12 +24,16 @@
+ 
+ #define BCM6328_LED_MAX_COUNT		24
+ #define BCM6328_LED_DEF_DELAY		500
++#define BCM6328_LED_INTERVAL_NUM	2
+ #define BCM6328_LED_INTERVAL_MS		20
+ 
+ #define BCM6328_LED_INTV_MASK		0x3f
+-#define BCM6328_LED_FAST_INTV_SHIFT	6
+-#define BCM6328_LED_FAST_INTV_MASK	(BCM6328_LED_INTV_MASK << \
+-					 BCM6328_LED_FAST_INTV_SHIFT)
++#define BCM6328_LED_INTV1_SHIFT		0
++#define BCM6328_LED_INTV1_MASK		(BCM6328_LED_INTV_MASK << \
++					 BCM6328_LED_INTV1_SHIFT)
++#define BCM6328_LED_INTV2_SHIFT		6
++#define BCM6328_LED_INTV2_MASK		(BCM6328_LED_INTV_MASK << \
++					 BCM6328_LED_INTV2_SHIFT)
+ #define BCM6328_SERIAL_LED_EN		BIT(12)
+ #define BCM6328_SERIAL_LED_MUX		BIT(13)
+ #define BCM6328_SERIAL_LED_CLK_NPOL	BIT(14)
+@@ -45,8 +49,8 @@
+ 
+ #define BCM6328_LED_MODE_MASK		3
+ #define BCM6328_LED_MODE_ON		0
+-#define BCM6328_LED_MODE_FAST		1
+-#define BCM6328_LED_MODE_BLINK		2
++#define BCM6328_LED_MODE_INTV1		1
++#define BCM6328_LED_MODE_INTV2		2
+ #define BCM6328_LED_MODE_OFF		3
+ #define BCM6328_LED_SHIFT(X)		((X) << 1)
+ 
+@@ -127,12 +131,18 @@ static void bcm6328_led_set(struct led_c
+ 	unsigned long flags;
+ 
+ 	spin_lock_irqsave(led->lock, flags);
+-	*(led->blink_leds) &= ~BIT(led->pin);
++
++	/* Remove LED from cached HW blinking intervals */
++	led->blink_leds[0] &= ~BIT(led->pin);
++	led->blink_leds[1] &= ~BIT(led->pin);
++
++	/* Set LED on/off */
+ 	if ((led->active_low && value == LED_OFF) ||
+ 	    (!led->active_low && value != LED_OFF))
+ 		bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
+ 	else
+ 		bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
++
+ 	spin_unlock_irqrestore(led->lock, flags);
+ }
+ 
+@@ -176,20 +186,59 @@ static int bcm6328_blink_set(struct led_
+ 	}
+ 
+ 	spin_lock_irqsave(led->lock, flags);
+-	if (*(led->blink_leds) == 0 ||
+-	    *(led->blink_leds) == BIT(led->pin) ||
+-	    *(led->blink_delay) == delay) {
++	/*
++	 * Check if any of the two configurable HW blinking intervals is
++	 * available:
++	 *   1. No LEDs assigned to the HW blinking interval.
++	 *   2. LEDs with the same delay assigned.
++	 */
++	if (led->blink_leds[0] == 0 ||
++	    led->blink_leds[0] == BIT(led->pin) ||
++	    led->blink_delay[0] == delay) {
++		unsigned long val;
++
++		/* Add LED to the first HW blinking interval cache */
++		led->blink_leds[0] |= BIT(led->pin);
++
++		/* Remove LED from the second HW blinking interval cache */
++		led->blink_leds[1] &= ~BIT(led->pin);
++
++		/* Cache the LED in the first HW blinking interval delay */
++		led->blink_delay[0] = delay;
++
++		/* Update the delay for the first HW blinking interval */
++		val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
++		val &= ~BCM6328_LED_INTV1_MASK;
++		val |= (delay << BCM6328_LED_INTV1_SHIFT);
++		bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
++
++		/* Set the LED to first HW blinking interval */
++		bcm6328_led_mode(led, BCM6328_LED_MODE_INTV1);
++
++		rc = 0;
++	} else if (led->blink_leds[1] == 0 ||
++		   led->blink_leds[1] == BIT(led->pin) ||
++		   led->blink_delay[1] == delay) {
+ 		unsigned long val;
+ 
+-		*(led->blink_leds) |= BIT(led->pin);
+-		*(led->blink_delay) = delay;
++		/* Remove LED from the first HW blinking interval */
++		led->blink_leds[0] &= ~BIT(led->pin);
++
++		/* Add LED to the second HW blinking interval */
++		led->blink_leds[1] |= BIT(led->pin);
+ 
++		/* Cache the LED in the first HW blinking interval delay */
++		led->blink_delay[1] = delay;
++
++		/* Update the delay for the second HW blinking interval */
+ 		val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
+-		val &= ~BCM6328_LED_FAST_INTV_MASK;
+-		val |= (delay << BCM6328_LED_FAST_INTV_SHIFT);
++		val &= ~BCM6328_LED_INTV2_MASK;
++		val |= (delay << BCM6328_LED_INTV2_SHIFT);
+ 		bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
+ 
+-		bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK);
++		/* Set the LED to second HW blinking interval */
++		bcm6328_led_mode(led, BCM6328_LED_MODE_INTV2);
++
+ 		rc = 0;
+ 	} else {
+ 		dev_dbg(led_cdev->dev,
+@@ -363,11 +412,13 @@ static int bcm6328_leds_probe(struct pla
+ 	if (!lock)
+ 		return -ENOMEM;
+ 
+-	blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL);
++	blink_leds = devm_kcalloc(dev, BCM6328_LED_INTERVAL_NUM,
++				  sizeof(*blink_leds), GFP_KERNEL);
+ 	if (!blink_leds)
+ 		return -ENOMEM;
+ 
+-	blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL);
++	blink_delay = devm_kcalloc(dev, BCM6328_LED_INTERVAL_NUM,
++				   sizeof(*blink_delay), GFP_KERNEL);
+ 	if (!blink_delay)
+ 		return -ENOMEM;
+