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PCI: Don't enable/disable ROM BAR if we're using a RAM shadow copy

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If we're using a RAM shadow copy instead of the ROM BAR, we don't need to
touch the ROM BAR enable bit.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2016-03-03 08:53:47 -06:00
parent 2ea4adf752
commit 4708f9a55b
1 changed files with 12 additions and 4 deletions
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16
drivers/pci/rom.c
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@ -24,13 +24,17 @@
*/
int pci_enable_rom(struct pci_dev *pdev)
{
struct resource *res = pdev->resource + PCI_ROM_RESOURCE;
struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
struct pci_bus_region region;
u32 rom_addr;
if (!res->flags)
return -1;
/* Nothing to enable if we're using a shadow copy in RAM */
if (res->flags & IORESOURCE_ROM_SHADOW)
return 0;
pcibios_resource_to_bus(pdev->bus, &region, res);
pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
rom_addr &= ~PCI_ROM_ADDRESS_MASK;
@ -49,7 +53,12 @@ EXPORT_SYMBOL_GPL(pci_enable_rom);
*/
void pci_disable_rom(struct pci_dev *pdev)
{
struct resource *res = &pdev->resource[PCI_ROM_RESOURCE];
u32 rom_addr;
if (res->flags & IORESOURCE_ROM_SHADOW)
return;
pci_read_config_dword(pdev, pdev->rom_base_reg, &rom_addr);
rom_addr &= ~PCI_ROM_ADDRESS_ENABLE;
pci_write_config_dword(pdev, pdev->rom_base_reg, rom_addr);
@ -154,7 +163,6 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size)
if (!rom) {
/* restore enable if ioremap fails */
if (!(res->flags & (IORESOURCE_ROM_ENABLE |
IORESOURCE_ROM_SHADOW |
IORESOURCE_ROM_COPY)))
pci_disable_rom(pdev);
return NULL;
@ -186,8 +194,8 @@ void pci_unmap_rom(struct pci_dev *pdev, void __iomem *rom)
iounmap(rom);
/* Disable again before continuing, leave enabled if pci=rom */
if (!(res->flags & (IORESOURCE_ROM_ENABLE | IORESOURCE_ROM_SHADOW)))
/* Disable again before continuing */
if (!(res->flags & IORESOURCE_ROM_ENABLE))
pci_disable_rom(pdev);
}
EXPORT_SYMBOL(pci_unmap_rom);