diff options
| author | David Yu <davyu@nvidia.com> | 2013-12-09 21:11:49 +0900 |
|---|---|---|
| committer | Harry Hong <hhong@nvidia.com> | 2013-12-10 15:27:39 -0800 |
| commit | 533c8331741947528545078da08bb4f9ae66065c (patch) | |
| tree | 2a76955e94769d444ff3a2cf915af5b7b26347da | |
| parent | f6972a7310fb2861d285502d42c15b289cebb6ff (diff) | |
input: misc: mpu: reduce mpu init time
200 ms delay caused by i2c error is removed.
Max 40 ms delay caused by logical mistake is removed.
8 ms delay is added in order to avoid i2c error on mpu chip power up.
Bug 1412917
Change-Id: Iebbef275ea0e6ba6a38cf0d497a256068f100afa
Signed-off-by: David Yu <davyu@nvidia.com>
Reviewed-on: http://git-master/r/343587
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Robert Collins <rcollins@nvidia.com>
Reviewed-by: Harry Hong <hhong@nvidia.com>
| -rw-r--r-- | drivers/input/misc/mpu/inv_gyro.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/input/misc/mpu/inv_gyro.c b/drivers/input/misc/mpu/inv_gyro.c index 039431aec401..aad2d075a89c 100644 --- a/drivers/input/misc/mpu/inv_gyro.c +++ b/drivers/input/misc/mpu/inv_gyro.c @@ -684,10 +684,10 @@ static int nvi_pwr_mgmt_1_war(struct inv_gyro_state_s *inf) for (i = 0; i < POWER_UP_TIME; i++) { err = inv_i2c_single_write(inf, inf->reg->pwr_mgmt_1, 0); - if (err > 0) { + if (!err) { val = -1; err = inv_i2c_read(inf, inf->reg->pwr_mgmt_1, 1, &val); - if (err > 0 && !val) + if (!err && !val) break; } mdelay(1); @@ -815,6 +815,8 @@ static int nvi_vreg_en_all(struct inv_gyro_state_s *inf) for (i = 0; i < ARRAY_SIZE(nvi_vregs); i++) err |= nvi_vreg_en(inf, i); + if (err == 1) + mdelay(8); return err; } |