diff options
| author | Mohan T <mohant@nvidia.com> | 2012-01-04 14:58:41 +0530 |
|---|---|---|
| committer | Dan Willemsen <dwillemsen@nvidia.com> | 2013-09-14 01:32:55 -0700 |
| commit | aa5a7b3728f2aa5b096eb5607ff4d1d60c02529b (patch) | |
| tree | aa94eacd8e916284ad0d58277ff060bea1af10b6 /drivers/nfc | |
| parent | 50045d85142c58edc50f564d2a35f753d297903b (diff) | |
drivers: nfc: pn544: Add 1ms delay after I2C read and write
pn544 seems to be slow in handling I2C read/write requests.
Even though pn544 acks the read/write but next operation fails.
Bug: 915848
Bug: 914700
Bug: 914691
Bug: 915598
Change-Id: I7851d0d4b7c24810ad27f3e0fbd4542b52dc8a5e
Signed-off-by: Mohan T <mohant@nvidia.com>
Reviewed-on: http://git-master/r/72867
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Rakesh Kumar <krakesh@nvidia.com>
Reviewed-by: Alok Chauhan <alokc@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Rebase-Id: Ra5ba478ae198bdbcc078f6f136bcfe554c8ba13a
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/pn544.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/nfc/pn544.c b/drivers/nfc/pn544.c index 97a1f6b869f0..91216e465e12 100644 --- a/drivers/nfc/pn544.c +++ b/drivers/nfc/pn544.c @@ -111,6 +111,10 @@ static ssize_t pn544_dev_read(struct file *filp, char __user *buf, mutex_unlock(&pn544_dev->read_mutex); + /* pn544 seems to be slow in handling I2C read requests + * so add 1ms delay after recv operation */ + udelay(1000); + if (ret < 0) { pr_err("%s: i2c_master_recv returned %d\n", __func__, ret); return ret; @@ -156,6 +160,10 @@ static ssize_t pn544_dev_write(struct file *filp, const char __user *buf, ret = -EIO; } + /* pn544 seems to be slow in handling I2C write requests + * so add 1ms delay after I2C send oparation */ + udelay(1000); + return ret; } |