Merge tag 'pci-v6.11-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull pci fixes from Bjorn Helgaas:

 - Add Manivannan Sadhasivam as PCI native host bridge and endpoint
   driver reviewer (Manivannan Sadhasivam)

 - Disable MHI RAM data parity error interrupt for qcom SA8775P SoC to
   work around hardware erratum that causes a constant stream of
   interrupts (Manivannan Sadhasivam)

 - Don't try to fall back to qcom Operating Performance Points (OPP)
   support unless the platform actually supports OPP (Manivannan
   Sadhasivam)

 - Add imx@lists.linux.dev mailing list to MAINTAINERS for NXP
   layerscape and imx6 PCI controller drivers (Frank Li)

* tag 'pci-v6.11-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  MAINTAINERS: PCI: Add NXP PCI controller mailing list imx@lists.linux.dev
  PCI: qcom: Use OPP only if the platform supports it
  PCI: qcom-ep: Disable MHI RAM data parity error interrupt for SA8775P SoC
  MAINTAINERS: Add Manivannan Sadhasivam as Reviewer for PCI native host bridge and endpoint drivers

2 files changed, 18 insertions, 2 deletions

diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c
index 236229f66c80..a9b263f749b6 100644
--- a/drivers/pci/controller/dwc/pcie-qcom-ep.c
+++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c
@@ -58,6 +58,7 @@
 #define PARF_DEBUG_CNT_AUX_CLK_IN_L1SUB_L2	0xc88
 #define PARF_DEVICE_TYPE			0x1000
 #define PARF_BDF_TO_SID_CFG			0x2c00
+#define PARF_INT_ALL_5_MASK			0x2dcc
 
 /* PARF_INT_ALL_{STATUS/CLEAR/MASK} register fields */
 #define PARF_INT_ALL_LINK_DOWN			BIT(1)
@@ -127,6 +128,9 @@
 /* PARF_CFG_BITS register fields */
 #define PARF_CFG_BITS_REQ_EXIT_L1SS_MSI_LTR_EN	BIT(1)
 
+/* PARF_INT_ALL_5_MASK fields */
+#define PARF_INT_ALL_5_MHI_RAM_DATA_PARITY_ERR	BIT(0)
+
 /* ELBI registers */
 #define ELBI_SYS_STTS				0x08
 #define ELBI_CS2_ENABLE				0xa4
@@ -158,10 +162,12 @@ enum qcom_pcie_ep_link_status {
  * struct qcom_pcie_ep_cfg - Per SoC config struct
  * @hdma_support: HDMA support on this SoC
  * @override_no_snoop: Override NO_SNOOP attribute in TLP to enable cache snooping
+ * @disable_mhi_ram_parity_check: Disable MHI RAM data parity error check
  */
 struct qcom_pcie_ep_cfg {
 	bool hdma_support;
 	bool override_no_snoop;
+	bool disable_mhi_ram_parity_check;
 };
 
 /**
@@ -480,6 +486,12 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci)
 	      PARF_INT_ALL_LINK_UP | PARF_INT_ALL_EDMA;
 	writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_MASK);
 
+	if (pcie_ep->cfg && pcie_ep->cfg->disable_mhi_ram_parity_check) {
+		val = readl_relaxed(pcie_ep->parf + PARF_INT_ALL_5_MASK);
+		val &= ~PARF_INT_ALL_5_MHI_RAM_DATA_PARITY_ERR;
+		writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_5_MASK);
+	}
+
 	ret = dw_pcie_ep_init_registers(&pcie_ep->pci.ep);
 	if (ret) {
 		dev_err(dev, "Failed to complete initialization: %d\n", ret);
@@ -901,6 +913,7 @@ static void qcom_pcie_ep_remove(struct platform_device *pdev)
 static const struct qcom_pcie_ep_cfg cfg_1_34_0 = {
 	.hdma_support = true,
 	.override_no_snoop = true,
+	.disable_mhi_ram_parity_check = true,
 };
 
 static const struct of_device_id qcom_pcie_ep_match[] = {
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 0180edf3310e..6f953e32d990 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -261,6 +261,7 @@ struct qcom_pcie {
 	const struct qcom_pcie_cfg *cfg;
 	struct dentry *debugfs;
 	bool suspended;
+	bool use_pm_opp;
 };
 
 #define to_qcom_pcie(x)		dev_get_drvdata((x)->dev)
@@ -1433,7 +1434,7 @@ static void qcom_pcie_icc_opp_update(struct qcom_pcie *pcie)
 			dev_err(pci->dev, "Failed to set bandwidth for PCIe-MEM interconnect path: %d\n",
 				ret);
 		}
-	} else {
+	} else if (pcie->use_pm_opp) {
 		freq_mbps = pcie_dev_speed_mbps(pcie_link_speed[speed]);
 		if (freq_mbps < 0)
 			return;
@@ -1592,6 +1593,8 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 				      max_freq);
 			goto err_pm_runtime_put;
 		}
+
+		pcie->use_pm_opp = true;
 	} else {
 		/* Skip ICC init if OPP is supported as it is handled by OPP */
 		ret = qcom_pcie_icc_init(pcie);
@@ -1683,7 +1686,7 @@ static int qcom_pcie_suspend_noirq(struct device *dev)
 		if (ret)
 			dev_err(dev, "Failed to disable CPU-PCIe interconnect path: %d\n", ret);
 
-		if (!pcie->icc_mem)
+		if (pcie->use_pm_opp)
 			dev_pm_opp_set_opp(pcie->pci->dev, NULL);
 	}
 	return ret;