haswell: add option to mark graphics memory write-combining.
The graphics memory can be accessed in a faster manner by setting it to write-combing mode. Add an option to enable write-combining for the graphics memory. Change-Id: I797fcd9f0dfb074f9e45476773acbfe614eb4b0a Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/2893 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
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@ -82,6 +82,14 @@ config DCACHE_RAM_ROMSTAGE_STACK_SIZE
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The amount of anticipated stack usage from the data cache
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during pre-ram rom stage execution.
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config MARK_GRAPHICS_MEM_WRCOMB
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bool "Mark graphics memory as write-combining."
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default n
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help
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The graphics performance may increase if the graphics
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memory is set as write-combining cache type. This option
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enables marking the graphics memory as write-combining.
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config HAVE_MRC
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bool "Add a System Agent binary"
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help
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@ -217,12 +217,29 @@ static void gma_set_subsystem(device_t dev, unsigned vendor, unsigned device)
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}
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}
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static void gma_read_resources(struct device *dev)
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{
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pci_dev_read_resources(dev);
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#if CONFIG_MARK_GRAPHICS_MEM_WRCOMB
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struct resource *res;
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/* Set the graphics memory to write combining. */
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res = find_resource(dev, PCI_BASE_ADDRESS_2);
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if (res == NULL) {
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printk(BIOS_DEBUG, "gma: memory resource not found.\n");
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return;
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}
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res->flags |= IORESOURCE_WRCOMB;
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#endif
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}
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static struct pci_operations gma_pci_ops = {
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.set_subsystem = gma_set_subsystem,
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};
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static struct device_operations gma_func0_ops = {
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.read_resources = pci_dev_read_resources,
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.read_resources = gma_read_resources,
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.set_resources = pci_dev_set_resources,
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.enable_resources = pci_dev_enable_resources,
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.init = gma_func0_init,
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