Subject: [PATCH 07/15] PCI: mvebu: Do not modify PCI IO type bits in conf_write

From: Pali Rohár <[email-masked]>
Date: Thu, 25 Nov 2021 13:45:57 +0100

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 <[email-masked]>
Fixes: 1f08673eef12 ("PCI: mvebu: Convert to PCI emulated bridge config space")
Cc: [email-masked]
---
 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

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