From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.136]:53994 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760322AbcDEV4L (ORCPT ); Tue, 5 Apr 2016 17:56:11 -0400 Date: Tue, 5 Apr 2016 16:56:04 -0500 From: Bjorn Helgaas To: Christoph Fritz Cc: Richard Zhu , Lucas Stach , Shawn Guo , Fabio Estevam , Bjorn Helgaas , Lee Jones , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: PCI: imx6: Factor out ref clock enable Message-ID: <20160405215604.GE15353@localhost> References: <1456411669-4699-1-git-send-email-chf.fritz@googlemail.com> <1456411669-4699-3-git-send-email-chf.fritz@googlemail.com> <20160311175850.GA4725@localhost> <1457911590.16725.37.camel@googlemail.com> <1457911855.16725.41.camel@googlemail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <1457911855.16725.41.camel@googlemail.com> Sender: linux-pci-owner@vger.kernel.org List-ID: Hi Christoph, On Mon, Mar 14, 2016 at 12:30:55AM +0100, Christoph Fritz wrote: > commit dfcc1a16e6954e8ca6cadfc9dd309db6b6ef46b2 > Author: Bjorn Helgaas > Date: Fri, 11 Mar 2016 11:15:36 -0600 > > Factor out ref clock enable to make it cleaner to add imx6sx support. No > functional change intended. > > Signed-off-by: Bjorn Helgaas > Tested-by: Christoph Fritz Applied to pci/host-imx6 for v4.7, thanks! > --- > drivers/pci/host/pci-imx6.c | 36 ++++++++++++++++++++++++------------ > 1 file changed, 24 insertions(+), 12 deletions(-) > > diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c > index bd3f7d0..4e0e47f 100644 > --- a/drivers/pci/host/pci-imx6.c > +++ b/drivers/pci/host/pci-imx6.c > @@ -264,6 +264,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp) > return 0; > } > > +static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) > +{ > + /* power up core phy and enable ref clock */ > + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, > + IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18); > + /* > + * the async reset input need ref clock to sync internally, > + * when the ref clock comes after reset, internal synced > + * reset time is too short, cannot meet the requirement. > + * add one ~10us delay here. > + */ > + udelay(10); > + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, > + IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); > + return 0; > +} > + > static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) > { > struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp); > @@ -287,18 +304,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) > goto err_pcie; > } > > - /* power up core phy and enable ref clock */ > - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, > - IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18); > - /* > - * the async reset input need ref clock to sync internally, > - * when the ref clock comes after reset, internal synced > - * reset time is too short, cannot meet the requirement. > - * add one ~10us delay here. > - */ > - udelay(10); > - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, > - IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16); > + ret = imx6_pcie_enable_ref_clk(imx6_pcie); > + if (ret) { > + dev_err(pp->dev, "unable to enable pcie ref clock\n"); > + goto err_ref_clk; > + } > > /* allow the clocks to stabilize */ > usleep_range(200, 500); > @@ -311,6 +321,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) > } > return 0; > > +err_ref_clk: > + clk_disable_unprepare(imx6_pcie->pcie); > err_pcie: > clk_disable_unprepare(imx6_pcie->pcie_bus); > err_pcie_bus: > -- > 2.1.4 > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html