Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757567Ab3GYUHT (ORCPT ); Thu, 25 Jul 2013 16:07:19 -0400 Received: from mail-bk0-f51.google.com ([209.85.214.51]:51481 "EHLO mail-bk0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755678Ab3GYUHN (ORCPT ); Thu, 25 Jul 2013 16:07:13 -0400 From: Jens Frederich To: gregkh@linuxfoundation.org Cc: jon.nettleton@gmail.com, cjb@laptop.org, dilinger@queued.net, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Jens Frederich Subject: [PATCH] Staging: olpc_dcon: change to msleep to usleep_range Date: Thu, 25 Jul 2013 22:06:32 +0200 Message-Id: <1374782792-2088-1-git-send-email-jfrederich@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1242 Lines: 38 The resolution of msleep is related to HZ, so with HZ set to 100 any msleep of less then 10ms will become ~10ms. This is not what we want. Use usleep_range to get more control of what is happening here. Signed-off-by: Jens Frederich --- drivers/staging/olpc_dcon/olpc_dcon.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/olpc_dcon/olpc_dcon.c b/drivers/staging/olpc_dcon/olpc_dcon.c index 193e1c6..7c460f2 100644 --- a/drivers/staging/olpc_dcon/olpc_dcon.c +++ b/drivers/staging/olpc_dcon/olpc_dcon.c @@ -131,13 +131,13 @@ power_up: pr_warn("unable to force dcon to power up: %d!\n", x); return x; } - msleep(10); /* we'll be conservative */ + usleep_range(10000, 11000); /* we'll be conservative */ } pdata->bus_stabilize_wiggle(); for (x = -1, timeout = 50; timeout && x < 0; timeout--) { - msleep(1); + usleep_range(1000, 1100); x = dcon_read(dcon, DCON_REG_ID); } if (x < 0) { -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/