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 06:50:44 +0900 |
| commit | 11e7946f196e5fdde20584e3e58c60335ee3b3bc (patch) | |
| tree | 81a1ee57bd8bc9a434af718a0769cf609fc7356f /drivers/leds | |
| parent | 95ea8eec341c1fc881407c96114de7e4173c1b7c (diff) | |
| download | kernel_samsung_smdk4412-11e7946f196e5fdde20584e3e58c60335ee3b3bc.zip kernel_samsung_smdk4412-11e7946f196e5fdde20584e3e58c60335ee3b3bc.tar.gz kernel_samsung_smdk4412-11e7946f196e5fdde20584e3e58c60335ee3b3bc.tar.bz2 | |
drivers/leds/leds-lp5523.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')
| -rw-r--r-- | drivers/leds/leds-lp5523.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c index 4248d78..0cc4ead 100644 --- a/drivers/leds/leds-lp5523.c +++ b/drivers/leds/leds-lp5523.c @@ -203,13 +203,6 @@ static int lp5523_configure(struct i2c_client *client) { 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0}, }; - lp5523_write(client, LP5523_REG_RESET, 0xff); - - usleep_range(10000, 20000); /* - * Exact value is not available. 10 - 20ms - * appears to be enough for reset. - */ - ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE); /* Chip startup time is 500 us, 1 - 2 ms gives some margin */ usleep_range(1000, 2000); @@ -941,6 +934,11 @@ static int lp5523_probe(struct i2c_client *client, usleep_range(1000, 2000); /* 500us abs min. */ } + lp5523_write(client, LP5523_REG_RESET, 0xff); + usleep_range(10000, 20000); /* + * Exact value is not available. 10 - 20ms + * appears to be enough for reset. + */ ret = lp5523_detect(client); if (ret) goto fail2; |