From: Nirmoy Das nirmoy.das@amd.com
[ Upstream commit 907830b0fc9e374d00f3c83de5e426157b482c01 ]
RX 5600 XT Pulse advertises support for BAR 0 being 256MB, 512MB, or 1GB, but it also supports 2GB, 4GB, and 8GB. Add a rebar size quirk so that the BAR 0 is big enough to cover complete VARM.
Signed-off-by: Christian König christian.koenig@amd.com Signed-off-by: Nirmoy Das nirmoy.das@amd.com Acked-by: Bjorn Helgaas bhelgaas@google.com Link: https://patchwork.kernel.org/project/dri-devel/patch/20210107175017.15893-5-... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/pci.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 89dece8a41321..9add26438be50 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3471,7 +3471,14 @@ u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar) return 0;
pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap); - return (cap & PCI_REBAR_CAP_SIZES) >> 4; + cap &= PCI_REBAR_CAP_SIZES; + + /* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */ + if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f && + bar == 0 && cap == 0x7000) + cap = 0x3f000; + + return cap >> 4; }
/**