linux-kernel - [PATCH 3.10 218/268] HID: i2c-hid: Add sleep between POWER ON and RESET

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Message-Id: <1497897167-14556-219-git-send-email-w@1wt.eu>
Date:   Mon, 19 Jun 2017 20:31:57 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Brendan McGrath <redmcg@...mandi.dyndns.org>,
        Jiri Kosina <jkosina@...e.cz>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 218/268] HID: i2c-hid: Add sleep between POWER ON and RESET

From: Brendan McGrath <redmcg@...mandi.dyndns.org>

commit a89af4abdf9b353cdd6f61afc0eaaac403304873 upstream.

Support for the Asus Touchpad was recently added. It turns out this
device can fail initialisation (and become unusable) when the RESET
command is sent too soon after the POWER ON command.

Unfortunately the i2c-hid specification does not specify the need for
a delay between these two commands. But it was discovered the Windows
driver has a 1ms delay.

As a result, this patch modifies the i2c-hid module to add a sleep
inbetween the POWER ON and RESET commands which lasts between 1ms and 5ms.

See https://github.com/vlasenko/hid-asus-dkms/issues/24 for further
details.

Signed-off-by: Brendan McGrath <redmcg@...mandi.dyndns.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/hid/i2c-hid/i2c-hid.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index ccc2f36b..6584a4d 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -326,6 +326,15 @@ static int i2c_hid_hwreset(struct i2c_client *client)
 	if (ret)
 		return ret;
 
+	/*
+	 * The HID over I2C specification states that if a DEVICE needs time
+	 * after the PWR_ON request, it should utilise CLOCK stretching.
+	 * However, it has been observered that the Windows driver provides a
+	 * 1ms sleep between the PWR_ON and RESET requests and that some devices
+	 * rely on this.
+	 */
+	usleep_range(1000, 5000);
+
 	i2c_hid_dbg(ihid, "resetting...\n");
 
 	ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
-- 
2.8.0.rc2.1.gbe9624a