From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Tissoires Subject: [PATCH v3 17/18] Input: synaptics-rmi4 - smbus: on resume, try 3 times if init fails Date: Thu, 13 Oct 2016 17:51:11 +0200 Message-ID: <1476373872-18027-18-git-send-email-benjamin.tissoires@redhat.com> References: <1476373872-18027-1-git-send-email-benjamin.tissoires@redhat.com> Return-path: In-Reply-To: <1476373872-18027-1-git-send-email-benjamin.tissoires@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Dmitry Torokhov , Andrew Duggan , Lyude Paul , Christopher Heiny , Nick Dyer , Bjorn Andersson , Dennis Wassenberg Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org List-Id: linux-input@vger.kernel.org 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 --- no changes in v3 no changes in v2 --- 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 8d7ffe4..b2d5932 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 = { -- 2.7.4