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charset="utf-8" apps_reset is LTSSM_EN on i.MX7, i.MX8MQ, i.MX8MM and i.MX8MP platforms. Since the assertion/de-assertion of apps_reset(LTSSM_EN bit) had been wrappered in imx_pcie_ltssm_enable() and imx_pcie_ltssm_disable(); Remove apps_reset toggle in imx_pcie_assert_core_reset() and imx_pcie_deassert_core_reset() functions. Use imx_pcie_ltssm_enable() and imx_pcie_ltssm_disable() to configure apps_reset directly. Fix fail to enumerate reliably PI7C9X2G608GP (hotplug) at i.MX8MM, which reported By Tim. Reported-by: Tim Harvey Closes: https://lore.kernel.org/all/CAJ+vNU3ohR2YKTwC4xoYrc1z-neDoH2TTZcMHD= y+poj9=3DjSy+w@mail.gmail.com/ Fixes: ef61c7d8d032 ("PCI: imx6: Deassert apps_reset in imx_pcie_deassert_c= ore_reset()") Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- drivers/pci/controller/dwc/pci-imx6.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller= /dwc/pci-imx6.c index 5f267dd261b5..f4e0342f4d56 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -776,7 +776,6 @@ static int imx7d_pcie_core_reset(struct imx_pcie *imx_p= cie, bool assert) static void imx_pcie_assert_core_reset(struct imx_pcie *imx_pcie) { reset_control_assert(imx_pcie->pciephy_reset); - reset_control_assert(imx_pcie->apps_reset); =20 if (imx_pcie->drvdata->core_reset) imx_pcie->drvdata->core_reset(imx_pcie, true); @@ -788,7 +787,6 @@ static void imx_pcie_assert_core_reset(struct imx_pcie = *imx_pcie) static int imx_pcie_deassert_core_reset(struct imx_pcie *imx_pcie) { reset_control_deassert(imx_pcie->pciephy_reset); 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Thu, 12 Jun 2025 02:29:53 +0000 Received: from AS8PR04MB8676.eurprd04.prod.outlook.com ([fe80::28b2:de72:ad25:5d93]) by AS8PR04MB8676.eurprd04.prod.outlook.com ([fe80::28b2:de72:ad25:5d93%4]) with mapi id 15.20.8835.018; Thu, 12 Jun 2025 02:29:53 +0000 From: Richard Zhu To: tharvey@gateworks.com, frank.li@nxp.com, l.stach@pengutronix.de, lpieralisi@kernel.org, kw@linux.com, manivannan.sadhasivam@linaro.org, robh@kernel.org, bhelgaas@google.com, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com Cc: linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org, Richard Zhu , Frank Li Subject: [PATCH v2 2/2] PCI: imx6: Align EP link start behavior with documentation Date: Thu, 12 Jun 2025 10:27:47 +0800 Message-Id: <20250612022747.1206053-3-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20250612022747.1206053-1-hongxing.zhu@nxp.com> References: <20250612022747.1206053-1-hongxing.zhu@nxp.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SI2PR04CA0016.apcprd04.prod.outlook.com (2603:1096:4:197::7) To AS8PR04MB8676.eurprd04.prod.outlook.com (2603:10a6:20b:42b::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR04MB8676:EE_|DBAPR04MB7430:EE_ X-MS-Office365-Filtering-Correlation-Id: cba2af37-bce8-4a84-7efb-08dda9590361 X-LD-Processed: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|7416014|52116014|366016|38350700014|921020; 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charset="utf-8" According to PCI/endpoint/pci-endpoint-cfs.rst, the endpoint (EP) should only link up after `echo 1 > start` is executed. To match the documented behavior, do not start the link automatically when adding the EP controller. Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- drivers/pci/controller/dwc/pci-imx6.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller= /dwc/pci-imx6.c index f4e0342f4d56..668b88bb7c95 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -1361,9 +1361,6 @@ static int imx_add_pcie_ep(struct imx_pcie *imx_pcie, =20 pci_epc_init_notify(ep->epc); =20 - /* Start LTSSM. */ - imx_pcie_ltssm_enable(dev); - return 0; } =20 --=20 2.37.1