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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.patch45
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
+