Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754954AbcK1Sdq (ORCPT ); Mon, 28 Nov 2016 13:33:46 -0500 Received: from mail-pg0-f68.google.com ([74.125.83.68]:36511 "EHLO mail-pg0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751453AbcK1Sdg (ORCPT ); Mon, 28 Nov 2016 13:33:36 -0500 From: Aniroop Mathur To: mcuos.com@gmail.com, dmitry.torokhov@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Cc: s.samuel@samsung.com, r.mahale@samsung.com, aniroop.mathur@gmail.com, Aniroop Mathur Subject: [PATCH] Input: touchscreen: w90p910 - change msleep to usleep_range for small msecs Date: Tue, 29 Nov 2016 00:13:02 +0530 Message-Id: <1480358582-2954-1-git-send-email-a.mathur@samsung.com> X-Mailer: git-send-email 2.6.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1068 Lines: 29 msleep(1~20) may not do what the caller intends, and will often sleep longer. (~20 ms actual sleep for any value given in the 1~20ms range) This is not the desired behaviour for many cases like device resume time, device suspend time, device enable time, retry logic, etc. Thus, change msleep to usleep_range for precise wakeups. Signed-off-by: Aniroop Mathur --- drivers/input/touchscreen/w90p910_ts.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/input/touchscreen/w90p910_ts.c b/drivers/input/touchscreen/w90p910_ts.c index da6004e..3f14b5a 100644 --- a/drivers/input/touchscreen/w90p910_ts.c +++ b/drivers/input/touchscreen/w90p910_ts.c @@ -171,9 +171,9 @@ static int w90p910_open(struct input_dev *dev) clk_enable(w90p910_ts->clk); __raw_writel(ADC_RST1, w90p910_ts->ts_reg); - msleep(1); + usleep_range(1000, 1100); __raw_writel(ADC_RST0, w90p910_ts->ts_reg); - msleep(1); + usleep_range(1000, 1100); /* set delay and screen type */ val = __raw_readl(w90p910_ts->ts_reg + 0x04); -- 2.6.2