From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pl0-f68.google.com ([209.85.160.68]:42099 "EHLO mail-pl0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752412AbeDHRW1 (ORCPT ); Sun, 8 Apr 2018 13:22:27 -0400 Received: by mail-pl0-f68.google.com with SMTP id t20-v6so865955ply.9 for ; Sun, 08 Apr 2018 10:22:27 -0700 (PDT) From: tskd08@gmail.com To: linux-media@vger.kernel.org Cc: mchehab@s-opensource.com, Akihiro Tsukada , crope@iki.fi Subject: [PATCH v5 4/5] dvb-usb-v2/gl861: use usleep_range() for short delay Date: Mon, 9 Apr 2018 02:21:37 +0900 Message-Id: <20180408172138.9974-5-tskd08@gmail.com> In-Reply-To: <20180408172138.9974-1-tskd08@gmail.com> References: <20180408172138.9974-1-tskd08@gmail.com> Sender: linux-media-owner@vger.kernel.org List-ID: From: Akihiro Tsukada As the kernel doc "timers-howto.txt" reads, short delay with msleep() can take much longer. In a case of raspbery-pi platform where CONFIG_HZ_100 was set, it actually affected the init of Friio devices since it issues lots of i2c transactions with short delay. Signed-off-by: Akihiro Tsukada --- Changes since v4: - none drivers/media/usb/dvb-usb-v2/gl861.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/dvb-usb-v2/gl861.c b/drivers/media/usb/dvb-usb-v2/gl861.c index ecff0062bfb..cdd7bfcb883 100644 --- a/drivers/media/usb/dvb-usb-v2/gl861.c +++ b/drivers/media/usb/dvb-usb-v2/gl861.c @@ -45,7 +45,7 @@ static int gl861_i2c_msg(struct dvb_usb_device *d, u8 addr, return -EINVAL; } - msleep(1); /* avoid I2C errors */ + usleep_range(1000, 2000); /* avoid I2C errors */ return usb_control_msg(d->udev, usb_rcvctrlpipe(d->udev, 0), req, type, value, index, rbuf, rlen, 2000); -- 2.17.0