From: Rob Herring <robh@kernel.org>
Date: Thu, 20 Aug 2020 21:54:04 -0600
Subject: PCI: dwc: Ensure FAST_LINK_MODE is cleared
Git-commit: cff9244432e833710a14ed597d33615d77934a9d
Patch-mainline: v5.10-rc1
References: bsc#1179344
"Fast Link Mode" is a simulation environment speed up setting which should
never be set and the default is not set. However some Amlogic platforms
have it set (by firmware presumably). See commit 87dccf09323f ("PCI:
amlogic: meson: Don't use FAST_LINK_MODE to set up link") for more
information. Let's clear it in core DWC code so we can drop some vendor
specific code.
Link: https://lore.kernel.org/r/20200821035420.380495-25-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/pci/controller/dwc/pcie-designware.c | 5 ++++-
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index e957a726be85..90dc1674aae5 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -559,6 +559,9 @@ void dw_pcie_setup(struct dw_pcie *pci)
dev_dbg(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
"enabled" : "disabled");
+ val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
+ val &= ~PORT_LINK_FAST_LINK_MODE;
+ dw_pcie_writel_dbi(pci, PCIE_PORT_LINK_CONTROL, val);
of_property_read_u32(np, "num-lanes", &pci->num_lanes);
if (!pci->num_lanes) {
@@ -567,7 +570,7 @@ void dw_pcie_setup(struct dw_pcie *pci)
}
/* Set the number of lanes */
- val = dw_pcie_readl_dbi(pci, PCIE_PORT_LINK_CONTROL);
+ val &= ~PORT_LINK_FAST_LINK_MODE;
val &= ~PORT_LINK_MODE_MASK;
switch (pci->num_lanes) {
case 1:
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 6d3bec33de98..66815581b498 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -36,6 +36,7 @@
#define PCIE_PORT_LINK_CONTROL 0x710
#define PORT_LINK_DLL_LINK_EN BIT(5)
+#define PORT_LINK_FAST_LINK_MODE BIT(7)
#define PORT_LINK_MODE_MASK GENMASK(21, 16)
#define PORT_LINK_MODE(n) FIELD_PREP(PORT_LINK_MODE_MASK, n)
#define PORT_LINK_MODE_1_LANES PORT_LINK_MODE(0x1)
--
2.26.2