[PATCH 1/4] pci: Update pci_set_vga_state to call arch functions

[Mike Travis]

Update pci_set_vga_state to call arch dependent functions to enable
Legacy VGA I/O transactions to be redirected to correct target.

Signed-off-by: Mike Travis <travis@xxxxxxx>

Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Alex Chiang <achiang@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Robin Holt <holt@xxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Adam Jackson <ajax@xxxxxxxx>
Cc: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Gaetan Nadon <memsize@xxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Aaron Plattner <aplattner@xxxxxxxxxx>
Cc: Jack Steiner <steiner@xxxxxxx>
Cc: Tiago Vignatti <tiago.vignatti@xxxxxxxxx>
Cc: Cliff Wickman <cpw@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Christian Zander <chzander@xxxxxxxxxx>
Cc: Yu Zhao <yu.zhao@xxxxxxxxx>

Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-pci@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
---
 drivers/pci/pci.c   |   25 ++++++++++++++++++++++++-
 include/linux/pci.h |    5 +++++
 2 files changed, 29 insertions(+), 1 deletion(-)

--- linux.orig/drivers/pci/pci.c
+++ linux/drivers/pci/pci.c
@@ -2544,6 +2544,23 @@
 	return 0;
 }
 
+/* Some architectures require additional programming to enable VGA */
+static arch_set_vga_state_t arch_set_vga_state;
+
+void pci_register_set_vga_state(arch_set_vga_state_t func)
+{
+	arch_set_vga_state = func;	/* NULL disables */
+}
+
+static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode,
+		      unsigned int command_bits, bool change_bridge)
+{
+	if (arch_set_vga_state)
+		return arch_set_vga_state(dev, decode, command_bits,
+						change_bridge);
+	return 0;
+}
+
 /**
  * pci_set_vga_state - set VGA decode state on device and parents if requested
  * @dev: the PCI device
@@ -2557,9 +2574,15 @@
 	struct pci_bus *bus;
 	struct pci_dev *bridge;
 	u16 cmd;
+	int rc;
 
 	WARN_ON(command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY));
 
+	/* ARCH specific VGA enables */
+	rc = pci_set_vga_state_arch(dev, decode, command_bits, change_bridge);
+	if (rc)
+		return rc;
+
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	if (decode == true)
 		cmd |= command_bits;
@@ -2769,6 +2792,7 @@
 EXPORT_SYMBOL(pci_disable_device);
 EXPORT_SYMBOL(pci_find_capability);
 EXPORT_SYMBOL(pci_bus_find_capability);
+EXPORT_SYMBOL(pci_register_set_vga_state);
 EXPORT_SYMBOL(pci_release_regions);
 EXPORT_SYMBOL(pci_request_regions);
 EXPORT_SYMBOL(pci_request_regions_exclusive);
@@ -2801,4 +2825,3 @@
 EXPORT_SYMBOL(pci_prepare_to_sleep);
 EXPORT_SYMBOL(pci_back_from_sleep);
 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);
-
--- linux.orig/include/linux/pci.h
+++ linux/include/linux/pci.h
@@ -942,6 +942,11 @@
 }
 #endif /* CONFIG_PCI_DOMAINS */
 
+/* some architectures require additional setup to direct VGA traffic */
+typedef int (*arch_set_vga_state_t)(struct pci_dev *pdev, bool decode,
+		      unsigned int command_bits, bool change_bridge);
+extern void pci_register_set_vga_state(arch_set_vga_state_t func);
+
 #else /* CONFIG_PCI is not enabled */
 
 /*

-- 
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