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authorWonkyu Kim <wonkyu.kim@intel.com>2022-08-03 12:47:06 -0700
committerSubrata Banik <subratabanik@google.com>2022-08-12 07:29:14 +0000
commit91bd6e19c92ed7984b4a0c7985c58512879e7a56 (patch)
treefc9428ff8bab252b60c38d07886c7ebdef9d5ef1 /src/soc/intel/common
parent9969f4b60928f6e1de7941f09afb70a2f27aa7ef (diff)
soc/intel/common: Ignore prefetch PCI attribute for IGD BAR0
From Meteorlake, IGD BAR0(GTTMMADR) is changed to 64bit prefetchable. Due to the prefetchable attribute, resource allocation for IGD BAR0 is assigned WC memory and it causes kernel driver failure. For avoiding kernel driver failure, ignore prefetch PCI attribute for IGD BAR0 to assign UC memory. We're working on publishing below information. - IGD BAR0(GTTMMADR) is changed to 64bit prefetchable BAR - GTTMMADDR BAR should be always mapped as UC memory although marked Pre-fetchable. BUG=b:241746156 TEST=boot to OS and check guc driver loading successful Signed-off-by: Wonkyu Kim <wonkyu.kim@intel.com> Change-Id: I76d816d51f32f99c5ebcca54f13ec6d4ba77bba5 Reviewed-on: https://review.coreboot.org/c/coreboot/+/66403 Reviewed-by: Angel Pons <th3fanbus@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Subrata Banik <subratabanik@google.com> Reviewed-by: Tarun Tuli <taruntuli@google.com>
Diffstat (limited to 'src/soc/intel/common')
-rw-r--r--src/soc/intel/common/block/graphics/Kconfig7
-rw-r--r--src/soc/intel/common/block/graphics/graphics.c13
2 files changed, 19 insertions, 1 deletions
diff --git a/src/soc/intel/common/block/graphics/Kconfig b/src/soc/intel/common/block/graphics/Kconfig
index bc07f5626f..8520e53562 100644
--- a/src/soc/intel/common/block/graphics/Kconfig
+++ b/src/soc/intel/common/block/graphics/Kconfig
@@ -29,4 +29,11 @@ config SOC_INTEL_GFX_FRAMEBUFFER_OFFSET
with GTT_SIZE value. On SoC platform where PCI config offset 0x18 points
to the GMADR directly can use the default value 0x0 without any override.
+config SOC_INTEL_GFX_NON_PREFETCHABLE_MMIO
+ bool
+ default n
+ help
+ Ignore BAR0(offset 0x10)'s pre-fetchable attribute to use non-prefetchable
+ MMIO to fix OS display driver failure.
+
endif
diff --git a/src/soc/intel/common/block/graphics/graphics.c b/src/soc/intel/common/block/graphics/graphics.c
index d13b322e90..e4ef458631 100644
--- a/src/soc/intel/common/block/graphics/graphics.c
+++ b/src/soc/intel/common/block/graphics/graphics.c
@@ -164,8 +164,19 @@ void graphics_gtt_rmw(unsigned long reg, uint32_t andmask, uint32_t ormask)
graphics_gtt_write(reg, val);
}
+static void graphics_dev_read_resources(struct device *dev)
+{
+ pci_dev_read_resources(dev);
+
+ if (CONFIG(SOC_INTEL_GFX_NON_PREFETCHABLE_MMIO)) {
+ struct resource *res_bar0 = find_resource(dev, PCI_BASE_ADDRESS_0);
+ if (res_bar0->flags & IORESOURCE_PREFETCH)
+ res_bar0->flags &= ~IORESOURCE_PREFETCH;
+ }
+}
+
static const struct device_operations graphics_ops = {
- .read_resources = pci_dev_read_resources,
+ .read_resources = graphics_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.init = gma_init,