diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/0820-drm-amdgpu-Enable-BIF-5.0-atomic-promotion-to-PCIe-3.patch')
-rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/0820-drm-amdgpu-Enable-BIF-5.0-atomic-promotion-to-PCIe-3.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/0820-drm-amdgpu-Enable-BIF-5.0-atomic-promotion-to-PCIe-3.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/0820-drm-amdgpu-Enable-BIF-5.0-atomic-promotion-to-PCIe-3.patch new file mode 100644 index 00000000..b988db85 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.14.71/0820-drm-amdgpu-Enable-BIF-5.0-atomic-promotion-to-PCIe-3.patch @@ -0,0 +1,45 @@ +From 869cedef57bb5c0e345222e23927bf421a0ed251 Mon Sep 17 00:00:00 2001 +From: Jay Cornwall <jay@jcornwall.me> +Date: Fri, 28 Aug 2015 11:25:39 -0500 +Subject: [PATCH 0820/4131] drm/amdgpu: Enable BIF 5.0 atomic promotion to PCIe + 3.0 AtomicOps + +Atomic operations to system memory are normally dropped by the BIF. +Some PCIe 3.0 platforms support atomic routing to the host for execution +by the CPU. To use this feature, atomic requests must be enabled in the +GPU's PCIe configuration space. + +This is a no-op on platforms which cannot route the atomic request to +the host. In this instance, atomics would be dropped with or without +this change. + +Signed-off-by: Jay Cornwall <jay@jcornwall.me> +Reviewed-by: Alex Deucher <alexander.deucher@amd.com> +Acked-by: John Bridgman <john.bridgman@amd.com> + + Conflicts: + drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c + +Change-Id: I69f0b9b616ce4b1e7e09f069cc10a110d49d7c64 +--- + drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c +index 3b3326d..7a29674 100644 +--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c ++++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c +@@ -1136,6 +1136,10 @@ static int gmc_v8_0_sw_init(void *handle) + adev->vm_manager.vram_base_offset = 0; + } + ++ /* Allow BIF to recode atomics to PCIe 3.0 AtomicOps. ++ */ ++ pci_enable_atomic_request(adev->pdev); ++ + return 0; + } + +-- +2.7.4 + |