linux-kernel - [PATCH 5/8] MIPS: pci-legacy: stop using of_pci_range_to

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Message-Id: <20210413062146.389690-6-ilya.lipnitskiy@gmail.com>
Date:   Mon, 12 Apr 2021 23:21:43 -0700
From:   Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Liviu Dudau <Liviu.Dudau@....com>
Subject: [PATCH 5/8] MIPS: pci-legacy: stop using of_pci_range_to_resource

Mirror commit aeba3731b150 ("powerpc/pci: Fix IO space breakage after
of_pci_range_to_resource() change").

Most MIPS platforms do not define PCI_IOBASE, nor implement
pci_address_to_pio(). Moreover, IO_SPACE_LIMIT is 0xffff for most MIPS
platforms. of_pci_range_to_resource passes the _start address_ of the IO
range into pci_address_to_pio, which then checks it against
IO_SPACE_LIMIT and fails, because for MIPS platforms that use
pci-legacy (pci-lantiq, pci-rt3883, pci-mt7620), IO ranges start much
higher than 0xffff.

In fact, pci-mt7621 in staging already works around this problem, see
commit 09dd629eeabb ("staging: mt7621-pci: fix io space and properly set
resource limits")

So just stop using of_pci_range_to_resource, which does not work for
MIPS.

Fixes PCI errors like:
  pci_bus 0000:00: root bus resource [io  0xffffffff]

Fixes: 0b0b0893d49b ("of/pci: Fix the conversion of IO ranges into IO resources")
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
Cc: Liviu Dudau <Liviu.Dudau@....com>
---
 arch/mips/pci/pci-legacy.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/mips/pci/pci-legacy.c b/arch/mips/pci/pci-legacy.c
index 39052de915f3..3a909194284a 100644
--- a/arch/mips/pci/pci-legacy.c
+++ b/arch/mips/pci/pci-legacy.c
@@ -166,8 +166,13 @@ void pci_load_of_ranges(struct pci_controller *hose, struct device_node *node)
 			res = hose->mem_resource;
 			break;
 		}
-		if (res != NULL)
-			of_pci_range_to_resource(&range, node, res);
+		if (res != NULL) {
+			res->name = node->full_name;
+			res->flags = range.flags;
+			res->start = range.cpu_addr;
+			res->end = range.cpu_addr + range.size - 1;
+			res->parent = res->child = res->sibling = NULL;
+		}
 	}
 }
 
-- 
2.31.1