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Input: elan_i2c - clear INT before resetting controller
Some old touchpad FWs need to have interrupt cleared before issuing reset command after updating firmware. We clear interrupt by attempting to read full report from the controller, and discarding any data read. Signed-off-by: KT Liao <kt.liao@emc.com.tw> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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1 changed files with 8 additions and 1 deletions
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@ -557,7 +557,14 @@ static int elan_i2c_finish_fw_update(struct i2c_client *client,
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long ret;
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int error;
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int len;
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u8 buffer[ETP_I2C_INF_LENGTH];
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u8 buffer[ETP_I2C_REPORT_LEN];
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len = i2c_master_recv(client, buffer, ETP_I2C_REPORT_LEN);
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if (len != ETP_I2C_REPORT_LEN) {
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error = len < 0 ? len : -EIO;
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dev_warn(dev, "failed to read I2C data after FW WDT reset: %d (%d)\n",
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error, len);
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}
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reinit_completion(completion);
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enable_irq(client->irq);
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