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Thu, 14 Nov 2024 23:09:41 -0800 (PST) Received: from thinkpad ([117.193.208.47]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-211d0ec7c3asm6508005ad.65.2024.11.14.23.09.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2024 23:09:40 -0800 (PST) Date: Fri, 15 Nov 2024 12:39:32 +0530 From: Manivannan Sadhasivam To: Richard Zhu Cc: l.stach@pengutronix.de, bhelgaas@google.com, lpieralisi@kernel.org, kw@linux.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, shawnguo@kernel.org, frank.li@nxp.com, s.hauer@pengutronix.de, festevam@gmail.com, imx@lists.linux.dev, kernel@pengutronix.de, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 08/10] PCI: imx6: Use dwc common suspend resume method Message-ID: <20241115070932.vt4cqshyjtks2hq4@thinkpad> References: <20241101070610.1267391-1-hongxing.zhu@nxp.com> <20241101070610.1267391-9-hongxing.zhu@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20241101070610.1267391-9-hongxing.zhu@nxp.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241114_230942_284149_232E097E X-CRM114-Status: GOOD ( 32.52 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Nov 01, 2024 at 03:06:08PM +0800, Richard Zhu wrote: > From: Frank Li > > Call common dwc suspend/resume function. Use dwc common iATU method to > send out PME_TURN_OFF message. In Old DWC implementations, > PCIE_ATU_INHIBIT_PAYLOAD bit in iATU Ctrl2 register is reserved. So the > generic DWC implementation of sending the PME_Turn_Off message using a > dummy MMIO write cannot be used. Use previouse method to kick off > PME_TURN_OFF MSG for these platforms. > > Replace the imx_pcie_stop_link() and imx_pcie_host_exit() by > dw_pcie_suspend_noirq() in imx_pcie_suspend_noirq(). > > Since dw_pcie_suspend_noirq() already does these, see below call stack: > dw_pcie_suspend_noirq() > dw_pcie_stop_link(); > imx_pcie_stop_link(); > pci->pp.ops->deinit(); > imx_pcie_host_exit(); > > Replace the imx_pcie_host_init(), dw_pcie_setup_rc() and > imx_pcie_start_link() by dw_pcie_resume_noirq() in > imx_pcie_resume_noirq(). > > Since dw_pcie_resume_noirq() already does these, see below call stack: > dw_pcie_resume_noirq() > pci->pp.ops->init(); > imx_pcie_host_init(); > dw_pcie_setup_rc(); > dw_pcie_start_link(); > imx_pcie_start_link(); > Are these two changes (dw_pcie_suspend_noirq(), dw_pcie_resume_noirq()) related to this patch? If not, these should be in a separate patch. > Signed-off-by: Frank Li > Signed-off-by: Richard Zhu > --- > drivers/pci/controller/dwc/pci-imx6.c | 95 ++++++++++----------------- > 1 file changed, 34 insertions(+), 61 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index fde2f4eaf804..3c074cc2605f 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -33,6 +33,7 @@ > #include > #include > > +#include "../../pci.h" > #include "pcie-designware.h" > > #define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9) > @@ -108,19 +109,18 @@ struct imx_pcie_drvdata { > int (*init_phy)(struct imx_pcie *pcie); > int (*enable_ref_clk)(struct imx_pcie *pcie, bool enable); > int (*core_reset)(struct imx_pcie *pcie, bool assert); > + const struct dw_pcie_host_ops *ops; > }; > > struct imx_pcie { > struct dw_pcie *pci; > struct gpio_desc *reset_gpiod; > - bool link_is_up; > struct clk_bulk_data clks[IMX_PCIE_MAX_CLKS]; > struct regmap *iomuxc_gpr; > u16 msi_ctrl; > u32 controller_id; > struct reset_control *pciephy_reset; > struct reset_control *apps_reset; > - struct reset_control *turnoff_reset; > u32 tx_deemph_gen1; > u32 tx_deemph_gen2_3p5db; > u32 tx_deemph_gen2_6db; > @@ -899,13 +899,11 @@ static int imx_pcie_start_link(struct dw_pcie *pci) > dev_info(dev, "Link: Only Gen1 is enabled\n"); > } > > - imx_pcie->link_is_up = true; > tmp = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA); > dev_info(dev, "Link up, Gen%i\n", tmp & PCI_EXP_LNKSTA_CLS); > return 0; > > err_reset_phy: > - imx_pcie->link_is_up = false; > dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n", > dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0), > dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1)); > @@ -1024,9 +1022,32 @@ static u64 imx_pcie_cpu_addr_fixup(struct dw_pcie *pcie, u64 cpu_addr) > return cpu_addr - entry->offset; > } > > +/* > + * In Old DWC implementations, PCIE_ATU_INHIBIT_PAYLOAD bit in iATU Ctrl2 > + * register is reserved. So the generic DWC implementation of sending the > + * PME_Turn_Off message using a dummy MMIO write cannot be used. > + */ > +static void imx_pcie_pme_turn_off(struct dw_pcie_rp *pp) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct imx_pcie *imx_pcie = to_imx_pcie(pci); > + > + regmap_set_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_PM_TURN_OFF); > + regmap_clear_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX6SX_GPR12_PCIE_PM_TURN_OFF); > + > + usleep_range(PCIE_PME_TO_L2_TIMEOUT_US/10, PCIE_PME_TO_L2_TIMEOUT_US); > +} > + > + Stray newline. > static const struct dw_pcie_host_ops imx_pcie_host_ops = { > .init = imx_pcie_host_init, > .deinit = imx_pcie_host_exit, > + .pme_turn_off = imx_pcie_pme_turn_off, > +}; > + > +static const struct dw_pcie_host_ops imx_pcie_host_dw_pme_ops = { > + .init = imx_pcie_host_init, > + .deinit = imx_pcie_host_exit, > }; > > static const struct dw_pcie_ops dw_pcie_ops = { > @@ -1147,43 +1168,6 @@ static int imx_add_pcie_ep(struct imx_pcie *imx_pcie, > return 0; > } > > -static void imx_pcie_pm_turnoff(struct imx_pcie *imx_pcie) > -{ > - struct device *dev = imx_pcie->pci->dev; > - > - /* Some variants have a turnoff reset in DT */ > - if (imx_pcie->turnoff_reset) { > - reset_control_assert(imx_pcie->turnoff_reset); > - reset_control_deassert(imx_pcie->turnoff_reset); Where these are handled in imx_pcie_pme_turn_off()? If you removed them intentionally for a reason, it should be mentioned in commit message. > - goto pm_turnoff_sleep; > - } > - > - /* Others poke directly at IOMUXC registers */ > - switch (imx_pcie->drvdata->variant) { > - case IMX6SX: > - case IMX6QP: > - regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, > - IMX6SX_GPR12_PCIE_PM_TURN_OFF, > - IMX6SX_GPR12_PCIE_PM_TURN_OFF); > - regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12, > - IMX6SX_GPR12_PCIE_PM_TURN_OFF, 0); > - break; > - default: > - dev_err(dev, "PME_Turn_Off not implemented\n"); > - return; > - } > - > - /* > - * Components with an upstream port must respond to > - * PME_Turn_Off with PME_TO_Ack but we can't check. > - * > - * The standard recommends a 1-10ms timeout after which to > - * proceed anyway as if acks were received. > - */ > -pm_turnoff_sleep: > - usleep_range(1000, 10000); > -} > - > static void imx_pcie_msi_save_restore(struct imx_pcie *imx_pcie, bool save) > { > u8 offset; > @@ -1207,36 +1191,26 @@ static void imx_pcie_msi_save_restore(struct imx_pcie *imx_pcie, bool save) [...] > @@ -1267,11 +1241,14 @@ static int imx_pcie_probe(struct platform_device *pdev) > > pci->dev = dev; > pci->ops = &dw_pcie_ops; > - pci->pp.ops = &imx_pcie_host_ops; > > imx_pcie->pci = pci; > imx_pcie->drvdata = of_device_get_match_data(dev); > > + pci->pp.ops = &imx_pcie_host_dw_pme_ops; > + if (imx_pcie->drvdata->ops) > + pci->pp.ops = imx_pcie->drvdata->ops; Use if..else pattern > + > /* Find the PHY if one is defined, only imx7d uses it */ > np = of_parse_phandle(node, "fsl,imx7d-pcie-phy", 0); > if (np) { > @@ -1343,13 +1320,6 @@ static int imx_pcie_probe(struct platform_device *pdev) > break; > } > > - /* Grab turnoff reset */ > - imx_pcie->turnoff_reset = devm_reset_control_get_optional_exclusive(dev, "turnoff"); > - if (IS_ERR(imx_pcie->turnoff_reset)) { > - dev_err(dev, "Failed to get TURNOFF reset control\n"); > - return PTR_ERR(imx_pcie->turnoff_reset); > - } > - Same here. Reason not explained. - Mani -- மணிவண்ணன் சதாசிவம்