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From edff8f777c6321ca89bb950a382f409c4a126e28 Mon Sep 17 00:00:00 2001
From: Gokul Sriram Palanisamy <gpalan@codeaurora.org>
Date: Thu, 15 Dec 2016 17:38:18 +0530
Subject: pcie: Set PCIE MRRS and MPS to 256B
Set Max Read Request Size and Max Payload Size to 256 bytes,
per chip team recommendation.
Change-Id: I097004be2ced1b3096ffc10c318aae0b2bb155e8
Signed-off-by: Gokul Sriram Palanisamy <gpalan@codeaurora.org>
---
drivers/pci/host/pcie-qcom.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
(limited to 'drivers/pci/host/pcie-qcom.c')
--- a/drivers/pci/dwc/pcie-qcom.c
+++ b/drivers/pci/dwc/pcie-qcom.c
@@ -131,6 +131,14 @@
#define PCIE20_LNK_CONTROL2_LINK_STATUS2 0xA0
+#define __set(v, a, b) (((v) << (b)) & GENMASK(a, b))
+#define __mask(a, b) (((1 << ((a) + 1)) - 1) & ~((1 << (b)) - 1))
+#define PCIE20_DEV_CAS 0x78
+#define PCIE20_MRRS_MASK __mask(14, 12)
+#define PCIE20_MRRS(x) __set(x, 14, 12)
+#define PCIE20_MPS_MASK __mask(7, 5)
+#define PCIE20_MPS(x) __set(x, 7, 5)
+
struct qcom_pcie_resources_2_1_0 {
struct clk *iface_clk;
struct clk *core_clk;
@@ -1472,6 +1480,35 @@ static int qcom_pcie_probe(struct platfo
return 0;
}
+static void qcom_pcie_fixup_final(struct pci_dev *dev)
+{
+ int cap, err;
+ u16 ctl, reg_val;
+
+ cap = pci_pcie_cap(dev);
+ if (!cap)
+ return;
+
+ err = pci_read_config_word(dev, cap + PCI_EXP_DEVCTL, &ctl);
+
+ if (err)
+ return;
+
+ reg_val = ctl;
+
+ if (((reg_val & PCIE20_MRRS_MASK) >> 12) > 1)
+ reg_val = (reg_val & ~(PCIE20_MRRS_MASK)) | PCIE20_MRRS(0x1);
+
+ if (((ctl & PCIE20_MPS_MASK) >> 5) > 1)
+ reg_val = (reg_val & ~(PCIE20_MPS_MASK)) | PCIE20_MPS(0x1);
+
+ err = pci_write_config_word(dev, cap + PCI_EXP_DEVCTL, reg_val);
+
+ if (err)
+ pr_err("pcie config write failed %d\n", err);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, qcom_pcie_fixup_final);
+
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 },
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