From:   =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
To:     Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Rob Herring <robh@kernel.org>,
        =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= <kw@linux.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        =?UTF-8?q?Marek=20Beh=C3=BAn?= <kabel@kernel.org>
Cc:     linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 07/15] PCI: mvebu: Do not modify PCI IO type bits in conf_write
Date:   Thu, 25 Nov 2021 13:45:57 +0100
Message-Id: <20211125124605.25915-8-pali@kernel.org>
In-Reply-To: <20211125124605.25915-1-pali@kernel.org>
References: <20211125124605.25915-1-pali@kernel.org>
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Precedence: bulk

PCI IO type bits are already initialized in mvebu_pci_bridge_emul_init()
function and only when IO support is enabled. These type bits are read-only
and pci-bridge-emul.c code already does not allow to modify them from upper
layers.

When IO support is disabled then all IO registers should be read-only and
return zeros. Therefore do not modify PCI IO type bits in
mvebu_pci_bridge_emul_base_conf_write() callback.

Signed-off-by: Pali Rohár <pali@kernel.org>
Fixes: 1f08673eef12 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Cc: stable@vger.kernel.org
---
 drivers/pci/controller/pci-mvebu.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 32694763e930..a0b661972436 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -522,13 +522,6 @@ mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge,
 		break;
 
 	case PCI_IO_BASE:
-		/*
-		 * We keep bit 1 set, it is a read-only bit that
-		 * indicates we support 32 bits addressing for the
-		 * I/O
-		 */
-		conf->iobase |= PCI_IO_RANGE_TYPE_32;
-		conf->iolimit |= PCI_IO_RANGE_TYPE_32;
 		mvebu_pcie_handle_iobase_change(port);
 		break;
 
-- 
2.20.1