aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/leds/leds-lp5521.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 16f281b8c2d..cb641f1b334 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -97,6 +97,9 @@
/* Status */
#define LP5521_EXT_CLK_USED 0x08
+/* default R channel current register value */
+#define LP5521_REG_R_CURR_DEFAULT 0xAF
+
struct lp5521_engine {
int id;
u8 mode;
@@ -643,6 +646,7 @@ static int __devinit lp5521_probe(struct i2c_client *client,
struct lp5521_chip *chip;
struct lp5521_platform_data *pdata;
int ret, i, led;
+ u8 buf;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip)
@@ -681,6 +685,20 @@ static int __devinit lp5521_probe(struct i2c_client *client,
* Exact value is not available. 10 - 20ms
* appears to be enough for reset.
*/
+
+ /*
+ * Make sure that the chip is reset by reading back the r channel
+ * current reg. This is dummy read is required on some platforms -
+ * otherwise further access to the R G B channels in the
+ * LP5521_REG_ENABLE register will not have any effect - strange!
+ */
+ lp5521_read(client, LP5521_REG_R_CURRENT, &buf);
+ if (buf != LP5521_REG_R_CURR_DEFAULT) {
+ dev_err(&client->dev, "error in reseting chip\n");
+ goto fail2;
+ }
+ usleep_range(10000, 20000);
+
ret = lp5521_detect(client);
if (ret) {