[PATCH v24 08/16] PCI: dwc: Disable two BARs to avoid unnecessary memory assignment

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



According to the section 3.5.7.2 "RC Mode" in DWC PCIe Dual Mode
Rev.5.20a, we should disable two BARs to avoid unnecessary memory
assignment during device enumeration. Otherwise, Renesas R-Car Gen4
PCIe controllers cannot work correctly in host mode.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index a7170fd0e847..56cc7ff6d508 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -737,6 +737,14 @@ int dw_pcie_setup_rc(struct dw_pcie_rp *pp)
 	u32 val, ctrl, num_ctrls;
 	int ret;
 
+	/*
+	 * According to the section 3.5.7.2 "RC Mode" in DWC PCIe Dual Mode
+	 * Rev.5.20a, we should disable two BARs to avoid unnecessary memory
+	 * assignment during device enumeration.
+	 */
+	dw_pcie_writel_dbi2(pci, PCI_BASE_ADDRESS_0, 0x0);
+	dw_pcie_writel_dbi2(pci, PCI_BASE_ADDRESS_1, 0x0);
+
 	/*
 	 * Enable DBI read-only registers for writing/updating configuration.
 	 * Write permission gets disabled towards the end of this function.
-- 
2.25.1





[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux