[PATCH 5.4 222/222] hwmon: (pmbus/ibm-cffps) Fix LED blink behavior

Greg Kroah-Hartman
2020-01-22T13:28:25Z

From: Eddie James <eajames@linux.ibm.com>

commit 92b39ad440968bab38eb6577d63c12994601ed94 upstream.

The LED blink_set function incorrectly did not tell the PSU LED to blink
if brightness was LED_OFF. Fix this, and also correct the LED_OFF
command data, which should give control of the LED back to the PSU
firmware. Also prevent I2C failures from getting the driver LED state
out of sync and add some dev_dbg statements.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20191106200106.29519-3-eajames@linux.ibm.com
Fixes: ef9e1cdf419a3 ("hwmon: (pmbus/cffps) Add led class device for power supply fault led")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/hwmon/pmbus/ibm-cffps.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)

--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -39,9 +39,13 @@
#define CFFPS_MFR_VAUX_FAULT BIT(6)
#define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)

+/*
+ * LED off state actually relinquishes LED control to PSU firmware, so it can
+ * turn on the LED for faults.
+ */
+#define CFFPS_LED_OFF 0
#define CFFPS_LED_BLINK BIT(0)
#define CFFPS_LED_ON BIT(1)
-#define CFFPS_LED_OFF BIT(2)
#define CFFPS_BLINK_RATE_MS 250

enum {
@@ -296,23 +300,31 @@ static int ibm_cffps_led_brightness_set(
enum led_brightness brightness)
{
int rc;
+ u8 next_led_state;
struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);

if (brightness == LED_OFF) {
- psu->led_state = CFFPS_LED_OFF;
+ next_led_state = CFFPS_LED_OFF;
} else {
brightness = LED_FULL;
+
if (psu->led_state != CFFPS_LED_BLINK)
- psu->led_state = CFFPS_LED_ON;
+ next_led_state = CFFPS_LED_ON;
+ else
+ next_led_state = CFFPS_LED_BLINK;
}

+ dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
+ brightness, next_led_state);
+
pmbus_set_page(psu->client, 0);

rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
- psu->led_state);
+ next_led_state);
if (rc < 0)
return rc;

+ psu->led_state = next_led_state;
led_cdev->brightness = brightness;

return 0;
@@ -325,10 +337,7 @@ static int ibm_cffps_led_blink_set(struc
int rc;
struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);

- psu->led_state = CFFPS_LED_BLINK;
-
- if (led_cdev->brightness == LED_OFF)
- return 0;
+ dev_dbg(&psu->client->dev, "LED blink set.\n");

pmbus_set_page(psu->client, 0);

@@ -337,6 +346,8 @@ static int ibm_cffps_led_blink_set(struc
if (rc < 0)
return rc;

+ psu->led_state = CFFPS_LED_BLINK;
+ led_cdev->brightness = LED_FULL;
*delay_on = CFFPS_BLINK_RATE_MS;
*delay_off = CFFPS_BLINK_RATE_MS;