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Mon, 8 Oct 2018 18:06:21 +0000 Received: from AM0PR04MB4290.eurprd04.prod.outlook.com ([fe80::3836:6416:4ebd:34ef]) by AM0PR04MB4290.eurprd04.prod.outlook.com ([fe80::3836:6416:4ebd:34ef%3]) with mapi id 15.20.1207.024; Mon, 8 Oct 2018 18:06:21 +0000 From: Leonard Crestez To: Shawn Guo , Lucas Stach , Richard Zhu CC: Lorenzo Pieralisi , Fabio Estevam , Stefan Agner , Marek Vasut , Ulf Hansson , Rob Herring , Mark Rutland , "linux-pm@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-pci@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , dl-linux-imx , "kernel@pengutronix.de" , "linux-kernel@vger.kernel.org" Subject: [PATCH v2 3/4] PCI: imx: Add multi-pd support Thread-Topic: [PATCH v2 3/4] PCI: imx: Add multi-pd support Thread-Index: AQHUXzGe6SZqbrUj90aARl9niCeThw== Date: Mon, 8 Oct 2018 18:06:21 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [95.76.156.53] x-mailer: git-send-email 2.17.1 x-clientproxiedby: AM6PR0102CA0011.eurprd01.prod.exchangelabs.com (2603:10a6:209:14::24) To AM0PR04MB4290.eurprd04.prod.outlook.com (2603:10a6:208:67::17) authentication-results: spf=none (sender IP is ) smtp.mailfrom=leonard.crestez@nxp.com; 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received-spf: None (protection.outlook.com: nxp.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: WFrNgwPoI5ToMbtWFIJkh0VvRXf0lkK+Xc/bU43rActH30b3kLPqFGc6oM82yozyoHCXw8J/gA0l2gglSUTFTKy4gSiQAfLgYj2dmqHNZVXbqXgHdJiIvYyE+mSqibZUQapvuaitc9zVoWQEUtYwsEl9SDRdYQ6EyoVM+amM7zfaCZ1cx1XjPPCoLn9nkd0grLL0aJshz5iBAQkDQ/UWSbOBCC1H1DPsbFDwsrnvLHOQ/p6afNKXFS+1cNtrHCAoNY4Zgkr0CKUTP9rfJ/x5txjrgsDLaceH7L1c4S39pIWL/9QPxdF7O2C0m75reY8hXNkAqC9BTqDrUuuLAomlEn1fh+8A5QZqZcvuowXZ4WI= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 19faf96a-684d-4e03-68fb-08d62d48c0c9 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Oct 2018 18:06:21.8176 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB5172 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On some chips the PCIE and PCIE_PHY blocks are in separate power domains which can be power-gated independently. The pci driver needs to handle this by keeping both domain active. This is intended for imx6sx where PCIE is in DISPLAY and PCIE_PHY in it's own domain. Defining the DISPLAY domain requires a way for pcie to keep it active or it will break when displays are off. The power-domains on imx6sx are meant to look like this: power-domains =3D <&pd_disp>, <&pd_pci>; power-domain-names =3D "pcie", "pcie_phy"; Signed-off-by: Leonard Crestez Reviewed-by: Ulf Hansson --- drivers/pci/controller/dwc/pci-imx6.c | 48 +++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller= /dwc/pci-imx6.c index 6171171db1fc..a482f86b02e6 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -25,10 +25,12 @@ #include #include #include #include #include +#include +#include =20 #include "pcie-designware.h" =20 #define to_imx6_pcie(x) dev_get_drvdata((x)->dev) =20 @@ -57,10 +59,15 @@ struct imx6_pcie { u32 tx_deemph_gen2_6db; u32 tx_swing_full; u32 tx_swing_low; int link_gen; struct regulator *vpcie; + + /* power domain for pcie */ + struct device *pd_pcie; + /* power domain for pcie phy */ + struct device *pd_pcie_phy; }; =20 /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */ #define PHY_PLL_LOCK_WAIT_MAX_RETRIES 2000 #define PHY_PLL_LOCK_WAIT_USLEEP_MIN 50 @@ -290,10 +297,47 @@ static int imx6q_pcie_abort_handler(unsigned long add= r, } =20 return 1; } =20 +static int imx6_pcie_attach_pd(struct device *dev) +{ + struct imx6_pcie *imx6_pcie =3D dev_get_drvdata(dev); + struct device_link *link; + + /* Do nothing when in a single power domain */ + if (dev->pm_domain) + return 0; + + imx6_pcie->pd_pcie =3D dev_pm_domain_attach_by_name(dev, "pcie"); + if (IS_ERR(imx6_pcie->pd_pcie)) + return PTR_ERR(imx6_pcie->pd_pcie); + link =3D device_link_add(dev, imx6_pcie->pd_pcie, + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | + DL_FLAG_RPM_ACTIVE); + if (IS_ERR(link)) { + dev_err(dev, "Failed to add device_link to pcie pd: %ld\n", PTR_ERR(link= )); + return PTR_ERR(link); + } + + imx6_pcie->pd_pcie_phy =3D dev_pm_domain_attach_by_name(dev, "pcie_phy"); + if (IS_ERR(imx6_pcie->pd_pcie_phy)) + return PTR_ERR(imx6_pcie->pd_pcie_phy); + + device_link_add(dev, imx6_pcie->pd_pcie_phy, + DL_FLAG_STATELESS | + DL_FLAG_PM_RUNTIME | + DL_FLAG_RPM_ACTIVE); + if (IS_ERR(link)) { + dev_err(dev, "Failed to add device_link to pcie_phy pd: %ld\n", PTR_ERR(= link)); + return PTR_ERR(link); + } + + return 0; +} + static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) { struct device *dev =3D imx6_pcie->pci->dev; =20 switch (imx6_pcie->variant) { @@ -1013,10 +1057,14 @@ static int imx6_pcie_probe(struct platform_device *= pdev) imx6_pcie->vpcie =3D NULL; } =20 platform_set_drvdata(pdev, imx6_pcie); =20 + ret =3D imx6_pcie_attach_pd(dev); + if (ret) + return ret; + ret =3D imx6_add_pcie_port(imx6_pcie, pdev); if (ret < 0) return ret; =20 return 0; --=20 2.17.1