From: Rob Herring <robh@kernel.org>
To: linux-pci@vger.kernel.org
Cc: Vidya Sagar <vidyas@nvidia.com>,
Jingoo Han <jingoohan1@gmail.com>,
Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Bjorn Helgaas <bhelgaas@google.com>
Subject: [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry
Date: Mon, 26 Oct 2020 10:48:52 -0500 [thread overview]
Message-ID: <20201026154852.221483-1-robh@kernel.org> (raw)
Prior to commit 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI
resources"), the DWC driver was setting up the last memory resource
rather than the first memory resource. This doesn't matter for most
platforms which only have 1 memory resource, but it broke Tegra194 which
has a 2nd (prefetchable) memory region which requires an ATU entry. The
first region on Tegra194 relies on the default 1:1 pass-thru of outbound
transactions which doesn't need an ATU entry.
Fixes: 0f71c60ffd26 ("PCI: dwc: Remove storing of PCI resources")
Reported-by: Vidya Sagar <vidyas@nvidia.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: Rob Herring <robh@kernel.org>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 674f32db85ca..44c2a6572199 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -586,8 +586,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
* ATU, so we should not program the ATU here.
*/
if (pp->bridge->child_ops == &dw_child_pcie_ops) {
- struct resource_entry *entry =
- resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
+ struct resource_entry *tmp, *entry = NULL;
+
+ /* Get last memory resource entry */
+ resource_list_for_each_entry(tmp, &pp->bridge->windows)
+ if (resource_type(tmp->res) == IORESOURCE_MEM)
+ entry = tmp;
dw_pcie_prog_outbound_atu(pci, PCIE_ATU_REGION_INDEX0,
PCIE_ATU_TYPE_MEM, entry->res->start,
--
2.25.1
next reply other threads:[~2020-10-26 15:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-26 15:48 Rob Herring [this message]
2020-10-26 16:22 ` [PATCH] PCI: dwc: Restore ATU memory resource setup to use last entry Jingoo Han
2020-10-26 16:49 ` Vidya Sagar
2020-10-26 18:02 ` Rob Herring
2020-11-03 16:24 ` Lorenzo Pieralisi
2020-11-03 19:30 ` Bjorn Helgaas
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