[PATCH v2 06/10] leds: st1202: restore Pattern0 PWM to full on after clearing pattern

[Manuel Fombuena]

When PATS is cleared the LED output is the product of the ILED analog
current register and the Pattern0 PWM duty cycle. brightness_set only
writes the ILED register, so if Pattern0 PWM is zero the LED remains
dark regardless of the brightness value set.

pattern_clear zeros all pattern PWM registers including Pattern0, which
means any subsequent brightness_set call has no visible effect until a
new pattern is programmed.

Restore Pattern0 PWM to full duty cycle after clearing so that ILED
alone controls brightness in static mode.

Signed-off-by: Manuel Fombuena <fombuena@xxxxxxxxxxx>
Assisted-by: Claude:claude-sonnet-4-6
---
 drivers/leds/leds-st1202.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/leds/leds-st1202.c b/drivers/leds/leds-st1202.c
index 9c1ae35dcb4c..933c50c317c1 100644
--- a/drivers/leds/leds-st1202.c
+++ b/drivers/leds/leds-st1202.c
@@ -35,6 +35,7 @@
 #define ST1202_MILLIS_PATTERN_DUR_MIN      22
 #define ST1202_PATTERN_DUR                 0x16
 #define ST1202_PATTERN_PWM                 0x1E
+#define ST1202_PATTERN_PWM_FULL            0x0FFF
 #define ST1202_PATTERN_REP                 0x15
 
 struct st1202_led {
@@ -218,6 +219,10 @@ static int st1202_led_pattern_clear(struct led_classdev *ldev)
 			return ret;
 	}
 
+	ret = st1202_pwm_pattern_write(chip, led->led_num, 0, ST1202_PATTERN_PWM_FULL);
+	if (ret != 0)
+		return ret;
+
 	return 0;
 }
 
-- 
2.54.0