diff options
| author |   Samu Onkalo <samu.p.onkalo@nokia.com> | 2010-11-24 12:57:05 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-11-25 06:50:43 +0900 |
| commit | 95ea8eec341c1fc881407c96114de7e4173c1b7c (patch) | |
| tree | caaa74d24e34d07ec74c7879ad30446878662e0d /drivers/leds/leds-lp5521.c | |
| parent | drivers/leds/leds-lp5523.c: adjust delays and add comments to them (diff) | |
| download | linux-dev-95ea8eec341c1fc881407c96114de7e4173c1b7c.tar.xz linux-dev-95ea8eec341c1fc881407c96114de7e4173c1b7c.zip | |
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.c | 12 |
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) { |