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authorSamu Onkalo <samu.p.onkalo@nokia.com>2010-11-24 12:57:05 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-25 06:50:43 +0900
commit95ea8eec341c1fc881407c96114de7e4173c1b7c (patch)
treecaaa74d24e34d07ec74c7879ad30446878662e0d /drivers/leds/leds-lp5521.c
parent2e4840edb7c485211993919a6a50d93c108198b8 (diff)
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>
Diffstat (limited to 'drivers/leds/leds-lp5521.c')
-rw-r--r--drivers/leds/leds-lp5521.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 963c014be0bf..33facd0c45d1 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) {