mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 07:22:33 +00:00
44 lines
1.6 KiB
Diff
44 lines
1.6 KiB
Diff
|
From 7f434723cdb6823443330cd4847d5c3b8dd30bd7 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Stanimir Varbanov <stanimir.varbanov@linaro.org>
|
||
|
|
Date: Fri, 18 Dec 2015 14:38:55 +0200
|
||
|
|
Subject: [PATCH 51/70] PCI: designware: Ensure ATU is enabled before IO/conf
|
||
|
|
space accesses
|
||
|
|
|
||
|
|
Read back the ATU CR2 register to ensure ATU programming is effective
|
||
|
|
before any subsequent I/O or config space accesses.
|
||
|
|
|
||
|
|
Without this, PCI device enumeration is unreliable.
|
||
|
|
|
||
|
|
[bhelgaas: changelog, comment]
|
||
|
|
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
|
||
|
|
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
|
||
|
|
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>
|
||
|
|
---
|
||
|
|
drivers/pci/host/pcie-designware.c | 8 ++++++++
|
||
|
|
1 file changed, 8 insertions(+)
|
||
|
|
|
||
|
|
--- a/drivers/pci/host/pcie-designware.c
|
||
|
|
+++ b/drivers/pci/host/pcie-designware.c
|
||
|
|
@@ -154,6 +154,8 @@ static int dw_pcie_wr_own_conf(struct pc
|
||
|
|
static void dw_pcie_prog_outbound_atu(struct pcie_port *pp, int index,
|
||
|
|
int type, u64 cpu_addr, u64 pci_addr, u32 size)
|
||
|
|
{
|
||
|
|
+ u32 val;
|
||
|
|
+
|
||
|
|
dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | index,
|
||
|
|
PCIE_ATU_VIEWPORT);
|
||
|
|
dw_pcie_writel_rc(pp, lower_32_bits(cpu_addr), PCIE_ATU_LOWER_BASE);
|
||
|
|
@@ -164,6 +166,12 @@ static void dw_pcie_prog_outbound_atu(st
|
||
|
|
dw_pcie_writel_rc(pp, upper_32_bits(pci_addr), PCIE_ATU_UPPER_TARGET);
|
||
|
|
dw_pcie_writel_rc(pp, type, PCIE_ATU_CR1);
|
||
|
|
dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2);
|
||
|
|
+
|
||
|
|
+ /*
|
||
|
|
+ * Make sure ATU enable takes effect before any subsequent config
|
||
|
|
+ * and I/O accesses.
|
||
|
|
+ */
|
||
|
|
+ dw_pcie_readl_rc(pp, PCIE_ATU_CR2, &val);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct irq_chip dw_msi_irq_chip = {
|