diff mbox series

[2/3] leds: leds-lp5569: Better handle enabling clock internal setting

Message ID 20240704015543.14495-2-ansuelsmth@gmail.com
State Superseded
Headers show
Series [1/3] leds: leds-lp5569: Fix typo in driver name | expand

Commit Message

Christian Marangi July 4, 2024, 1:55 a.m. UTC 
Better handle enabling clock internal setting. In further testing it was
notice that internal clock config MUST be set before clock output config
or the LED CHIP might stop working.

This wasn't documented and was actually found on devices that have 2
chip chained where one chip provide clock for the other.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/leds/leds-lp5569.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/leds/leds-lp5569.c b/drivers/leds/leds-lp5569.c
index b7a74d6c19ca..2b4f358bc63a 100644
--- a/drivers/leds/leds-lp5569.c
+++ b/drivers/leds/leds-lp5569.c
@@ -179,20 +179,25 @@  static int lp5569_post_init_device(struct lp55xx_chip *chip)
 
 	val = LP5569_DEFAULT_CONFIG;
 	val |= FIELD_PREP(LP5569_CP_MODE_MASK, chip->pdata->charge_pump_mode);
+	ret = lp55xx_write(chip, LP5569_REG_MISC, val);
+	if (ret)
+		return ret;
 
 	if (chip->pdata->clock_mode == LP55XX_CLOCK_INT) {
+		/* Internal clock MUST be configured before CLK output */
+		ret = lp55xx_update_bits(chip, LP5569_REG_MISC,
+					 LP5569_INTERNAL_CLK,
+					 LP5569_INTERNAL_CLK);
+		if (ret)
+			return ret;
+
 		ret = lp55xx_update_bits(chip, LP5569_REG_IO_CONTROL,
 					 LP5569_CLK_OUTPUT,
 					 LP5569_CLK_OUTPUT);
 		if (ret)
 			return ret;
-
-		val |= LP5569_INTERNAL_CLK;
 	}
 
-	ret = lp55xx_write(chip, LP5569_REG_MISC, val);
-	if (ret)
-		return ret;
 
 	return lp5569_init_program_engine(chip);
 }