generic: backport initial LEDs hw control support

Backport initial LEDs hw control support. Currently this is limited to
only rx/tx and link events for the netdev trigger but the API got
accepted and the additional modes are working on and will be backported
later.

Refresh every patch and add the additional config flag for QCA8K new
LEDs support.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 0a4b309f41062ef40706162ae53b6428982a0685)

1 files changed, 107 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/818-v6.5-08-leds-trigger-netdev-add-support-for-LED-hw-control.patch b/target/linux/generic/backport-5.15/818-v6.5-08-leds-trigger-netdev-add-support-for-LED-hw-control.patch
new file mode 100644
index 0000000000..52faa4809b
--- /dev/null
+++ b/target/linux/generic/backport-5.15/818-v6.5-08-leds-trigger-netdev-add-support-for-LED-hw-control.patch
@@ -0,0 +1,107 @@
+From 7c145a34ba6e380616af93262fcab9fc7261d851 Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Mon, 29 May 2023 18:32:38 +0200
+Subject: [PATCH 08/13] leds: trigger: netdev: add support for LED hw control
+
+Add support for LED hw control for the netdev trigger.
+
+The trigger on calling set_baseline_state to configure a new mode, will
+do various check to verify if hw control can be used for the requested
+mode in can_hw_control() function.
+
+It will first check if the LED driver supports hw control for the netdev
+trigger, then will use hw_control_is_supported() and finally will call
+hw_control_set() to apply the requested mode.
+
+To use such mode, interval MUST be set to the default value and net_dev
+MUST be set. If one of these 2 value are not valid, hw control will
+never be used and normal software fallback is used.
+
+The default interval value is moved to a define to make sure they are
+always synced.
+
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+Reviewed-by: Andrew Lunn <andrew@lunn.ch>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/leds/trigger/ledtrig-netdev.c | 43 +++++++++++++++++++++++++--
+ 1 file changed, 41 insertions(+), 2 deletions(-)
+
+--- a/drivers/leds/trigger/ledtrig-netdev.c
++++ b/drivers/leds/trigger/ledtrig-netdev.c
+@@ -24,6 +24,8 @@
+ #include <linux/timer.h>
+ #include "../leds.h"
+ 
++#define NETDEV_LED_DEFAULT_INTERVAL	50
++
+ /*
+  * Configurable sysfs attributes:
+  *
+@@ -68,6 +70,13 @@ static void set_baseline_state(struct le
+ 	int current_brightness;
+ 	struct led_classdev *led_cdev = trigger_data->led_cdev;
+ 
++	/* Already validated, hw control is possible with the requested mode */
++	if (trigger_data->hw_control) {
++		led_cdev->hw_control_set(led_cdev, trigger_data->mode);
++
++		return;
++	}
++
+ 	current_brightness = led_cdev->brightness;
+ 	if (current_brightness)
+ 		led_cdev->blink_brightness = current_brightness;
+@@ -103,12 +112,42 @@ static bool supports_hw_control(struct l
+ 
+ static bool can_hw_control(struct led_netdev_data *trigger_data)
+ {
++	unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL);
++	unsigned int interval = atomic_read(&trigger_data->interval);
+ 	struct led_classdev *led_cdev = trigger_data->led_cdev;
++	int ret;
+ 
+ 	if (!supports_hw_control(led_cdev))
+ 		return false;
+ 
+-	return false;
++	/*
++	 * Interval must be set to the default
++	 * value. Any different value is rejected if in hw
++	 * control.
++	 */
++	if (interval != default_interval)
++		return false;
++
++	/*
++	 * net_dev must be set with hw control, otherwise no
++	 * blinking can be happening and there is nothing to
++	 * offloaded.
++	 */
++	if (!trigger_data->net_dev)
++		return false;
++
++	/* Check if the requested mode is supported */
++	ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode);
++	/* Fall back to software blinking if not supported */
++	if (ret == -EOPNOTSUPP)
++		return false;
++	if (ret) {
++		dev_warn(led_cdev->dev,
++			 "Current mode check failed with error %d\n", ret);
++		return false;
++	}
++
++	return true;
+ }
+ 
+ static ssize_t device_name_show(struct device *dev,
+@@ -413,7 +452,7 @@ static int netdev_trig_activate(struct l
+ 	trigger_data->device_name[0] = 0;
+ 
+ 	trigger_data->mode = 0;
+-	atomic_set(&trigger_data->interval, msecs_to_jiffies(50));
++	atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL));
+ 	trigger_data->last_activity = 0;
+ 
+ 	led_set_trigger_data(led_cdev, trigger_data);