linux-kernel - Re: [PATCH v2] PCI: qcom: Use default config space read function

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Date:   Thu, 14 Mar 2019 14:18:44 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        PCI <linux-pci@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>
Subject: Re: [PATCH v2] PCI: qcom: Use default config space read function

On 14/03/2019 12:10, Srinivas Kandagatla wrote:

> Here is the output: https://paste.ubuntu.com/p/kFWZ4kXCxT/

Could you test the following patch:
And report boot log as well as output of lspci -vv ?

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 45ff5e4f8af6..aca656eff8ca 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -727,7 +727,11 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
 	/* Enable write permission for the DBI read-only register */
 	dw_pcie_dbi_ro_wr_en(pci);
 	/* Program correct class for RC */
+	dw_pcie_rd_own_conf(pp, PCI_CLASS_REVISION, 4, &val);
+	printk("\tBEFORE: CLASS/REV=%08x\n", val);
 	dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
+	dw_pcie_rd_own_conf(pp, PCI_CLASS_REVISION, 4, &val);
+	printk("\t AFTER: CLASS/REV=%08x\n", val);
 	/* Better disable write permission right after the update */
 	dw_pcie_dbi_ro_wr_dis(pci);
 
diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index d185ea5fe996..c5e16f9aaf44 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1129,25 +1129,8 @@ static int qcom_pcie_host_init(struct pcie_port *pp)
 	return ret;
 }
 
-static int qcom_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
-				 u32 *val)
-{
-	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-
-	/* the device class is not reported correctly from the register */
-	if (where == PCI_CLASS_REVISION && size == 4) {
-		*val = readl(pci->dbi_base + PCI_CLASS_REVISION);
-		*val &= 0xff;	/* keep revision id */
-		*val |= PCI_CLASS_BRIDGE_PCI << 16;
-		return PCIBIOS_SUCCESSFUL;
-	}
-
-	return dw_pcie_read(pci->dbi_base + where, size, val);
-}
-
 static const struct dw_pcie_host_ops qcom_pcie_dw_ops = {
 	.host_init = qcom_pcie_host_init,
-	.rd_own_conf = qcom_pcie_rd_own_conf,
 };
 
 /* Qcom IP rev.: 2.1.0	Synopsys IP rev.: 4.01a */
@@ -1299,6 +1282,13 @@ static int qcom_pcie_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static void qcom_fixup_class(struct pci_dev *dev)
+{
+	printk("\tAPPLYING %s\n", __func__);
+	dev->class = PCI_CLASS_BRIDGE_PCI << 8;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class); // 8064
+
 static const struct of_device_id qcom_pcie_match[] = {
 	{ .compatible = "qcom,pcie-apq8084", .data = &ops_1_0_0 },
 	{ .compatible = "qcom,pcie-ipq8064", .data = &ops_2_1_0 },