From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936176Ab3DJAaz (ORCPT ); Tue, 9 Apr 2013 20:30:55 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:58097 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935194Ab3DJAar (ORCPT ); Tue, 9 Apr 2013 20:30:47 -0400 From: James M Leddy To: linux-kernel@vger.kernel.org, dmitry.torokhov@gmail.com Cc: haitao.zhang@canonical.com Subject: [PATCH 1/1][RESUBMIT] input: fix weird issue of synaptics psmouse sync lost after resume Date: Tue, 9 Apr 2013 20:30:43 -0400 Message-Id: <1365553843-11951-2-git-send-email-james.leddy@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1365553843-11951-1-git-send-email-james.leddy@canonical.com> References: <1365553843-11951-1-git-send-email-james.leddy@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric Miao In summary, the symptom is intermittent key events lost after resume on some machines with synaptics touchpad (seems this is synaptics _only_), and key events loss is due to serio port reconnect after psmouse sync lost. Removing psmouse and inserting it back during the suspend/resume process is able to work around the issue, so the difference between psmouse_connect() and psmouse_reconnect() is the key to the root cause of this problem. After comparing the two different paths, synaptics driver has its own implementation of synaptics_reconnect(), and the missing psmouse_probe() seems significant, the patch below added psmouse_probe() to the reconnect process, and has been verified many times that the issue could not be reliably reproduced. There are two PS/2 commands in psmouse_probe(): 1. PSMOUSE_CMD_GETID 2. PSMOUSE_CMD_RESET_DIS Only the PSMOUSE_CMD_GETID seems to be significant. The PSMOUSE_CMD_RESET_DIS is irrelevant to this issue after trying several times. So we have only implemented this patch to issue the PSMOUSE_CMD_GETID so far. Tested-by: Daniel Manrique Signed-off-by: James M Leddy --- drivers/input/mouse/synaptics.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c index 12d12ca..3438a9d 100644 --- a/drivers/input/mouse/synaptics.c +++ b/drivers/input/mouse/synaptics.c @@ -1355,6 +1355,7 @@ static int synaptics_reconnect(struct psmouse *psmouse) { struct synaptics_data *priv = psmouse->private; struct synaptics_data old_priv = *priv; + unsigned char param[2]; int retry = 0; int error; @@ -1370,6 +1371,7 @@ static int synaptics_reconnect(struct psmouse *psmouse) */ ssleep(1); } + ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID); error = synaptics_detect(psmouse, 0); } while (error && ++retry < 3); -- 1.7.9.5