[PATCH 11/11] Input: synaptics-rmi4 - smbus: on resume, try 3 times if init fails

[Benjamin Tissoires]

In some rare cases, we can't retrieve the SMBus version and so we fail
binding the touchpad back. Instead of leaving a touchpad dead, try again
to reinitialize it.

Signed-off-by: Benjamin Tissoires <benjamin.tissoi...@redhat.com>
---
 drivers/input/rmi4/rmi_smbus.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/input/rmi4/rmi_smbus.c b/drivers/input/rmi4/rmi_smbus.c
index 023dbd5..a8e4af6 100644
--- a/drivers/input/rmi4/rmi_smbus.c
+++ b/drivers/input/rmi4/rmi_smbus.c
@@ -265,10 +265,29 @@ static int rmi_smb_reset(struct rmi_transport_dev *xport, 
u16 reset_addr)
 {
        struct rmi_smb_xport *rmi_smb =
                container_of(xport, struct rmi_smb_xport, xport);
+       struct i2c_client *client = rmi_smb->client;
+       struct rmi_device_platform_data *pdata;
+       int tries, ret;
 
        rmi_smb_clear_state(rmi_smb);
 
-       return rmi_smb_enable_smbus_mode(rmi_smb);
+       for (tries = 3; tries > 0; tries--) {
+               ret = rmi_smb_enable_smbus_mode(rmi_smb);
+               if (!ret)
+                       break;
+
+               /* we failed enabling SMBus, try again later */
+               msleep(500);
+       }
+
+       if (ret < 0) {
+               dev_warn(&client->dev,
+                        "failed to enable SMBus mode, giving up.\n");
+               pdata = dev_get_platdata(&rmi_smb->client->dev);
+               rmi_transport_enable(pdata, false);
+       }
+
+       return ret;
 }
 
 static const struct rmi_transport_ops rmi_smb_ops = {
-- 
2.5.5