From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f195.google.com ([209.85.128.195]:37332 "EHLO mail-wr0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1033380AbeEXOgh (ORCPT ); Thu, 24 May 2018 10:36:37 -0400 From: Marek Vasut To: linux-pci@vger.kernel.org Cc: Marek Vasut , Geert Uytterhoeven , Lorenzo Pieralisi , Phil Edworthy , Simon Horman , Wolfram Sang , linux-renesas-soc@vger.kernel.org Subject: [PATCH v4 4/6] PCI: rcar: Poll more often in rcar_pcie_wait_for_dl() Date: Thu, 24 May 2018 16:36:22 +0200 Message-Id: <20180524143624.26718-5-marek.vasut+renesas@gmail.com> In-Reply-To: <20180524143624.26718-1-marek.vasut+renesas@gmail.com> References: <20180524143624.26718-1-marek.vasut+renesas@gmail.com> Sender: linux-pci-owner@vger.kernel.org List-ID: The data link active signal usually takes ~20 uSec to be asserted, poll the bit more often to avoid useless delays in this function. Use udelay() instead of usleep() for such a small delay as suggested by the timer documentation and because this will be used in atomic context later on when the suspend/resume patches land. Signed-off-by: Marek Vasut Cc: Geert Uytterhoeven Cc: Lorenzo Pieralisi Cc: Phil Edworthy Cc: Simon Horman Cc: Wolfram Sang Cc: linux-renesas-soc@vger.kernel.org --- V2: s/content/context in commit message V3: Add cpu_relax() V4: Rebase on top of Lorenzo's pci/rcar, fix up the rebase breakage induced by patches therein --- drivers/pci/host/pcie-rcar.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index d6a7e8482dcf..4843a4dc6059 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -546,13 +546,14 @@ static int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie) static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie) { - unsigned int timeout = 10; + unsigned int timeout = 10000; while (timeout--) { if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE)) return 0; - msleep(5); + udelay(5); + cpu_relax(); } return -ETIMEDOUT; -- 2.16.2