drivers/leds/leds-lp5521.c: perform SW reset before detection

Chip detection may fail if the chip is in some odd state for example after
system restart.  Chip doesn't have HW reset line.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 963c014be0b..33facd0c45d 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -245,13 +245,6 @@ static int lp5521_configure(struct i2c_client *client,
 
         lp5521_init_engine(chip, attr_group);
 
-        lp5521_write(client, LP5521_REG_RESET, 0xff);
-
-        usleep_range(10000, 20000); /*
-                                     * Exact value is not available. 10 - 20ms
-                                     * appears to be enough for reset.
-                                     */
-
         /* Set all PWMs to direct control mode */
         ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
 
@@ -716,6 +709,11 @@ static int lp5521_probe(struct i2c_client *client,
                 usleep_range(1000, 2000); /* 500us abs min. */
         }
 
+        lp5521_write(client, LP5521_REG_RESET, 0xff);
+        usleep_range(10000, 20000); /*
+                                     * Exact value is not available. 10 - 20ms
+                                     * appears to be enough for reset.
+                                     */
         ret = lp5521_detect(client);
 
         if (ret) {