1 files changed, 45 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.19.8/0970-drm-amdgpu-nbio7.4-add-hw-bug-workaround-for-vega20.patch b/common/recipes-kernel/linux/linux-yocto-4.19.8/0970-drm-amdgpu-nbio7.4-add-hw-bug-workaround-for-vega20.patch
new file mode 100644
index 00000000..3dcd0432
--- /dev/null
+++ b/common/recipes-kernel/linux/linux-yocto-4.19.8/0970-drm-amdgpu-nbio7.4-add-hw-bug-workaround-for-vega20.patch
@@ -0,0 +1,45 @@
+From 368094af54681f795fe16224dc49ec6b39955296 Mon Sep 17 00:00:00 2001
+From: Alex Deucher <alexander.deucher@amd.com>
+Date: Wed, 19 Dec 2018 18:05:41 -0500
+Subject: [PATCH 0970/2940] drm/amdgpu/nbio7.4: add hw bug workaround for
+ vega20
+
+Configure PCIE_CI_CNTL to work around a hw bug that affects
+some multi-GPU compute workloads.
+
+Acked-by: Feifei Xu <Feifei.Xu@amd.com>
+Reviewed-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+---
+ drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c b/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
+index f8cee95d61cc..4cd31a276dcd 100644
+--- a/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
++++ b/drivers/gpu/drm/amd/amdgpu/nbio_v7_4.c
+@@ -31,6 +31,7 @@
+ 
+ #define smnCPM_CONTROL                                                                                  0x11180460
+ #define smnPCIE_CNTL2                                                                                   0x11180070
++#define smnPCIE_CI_CNTL                                                                                 0x11180080
+ 
+ static u32 nbio_v7_4_get_rev_id(struct amdgpu_device *adev)
+ {
+@@ -222,7 +223,13 @@ static void nbio_v7_4_detect_hw_virt(struct amdgpu_device *adev)
+ 
+ static void nbio_v7_4_init_registers(struct amdgpu_device *adev)
+ {
++	uint32_t def, data;
++
++	def = data = RREG32_PCIE(smnPCIE_CI_CNTL);
++	data = REG_SET_FIELD(data, PCIE_CI_CNTL, CI_SLV_ORDERING_DIS, 1);
+ 
++	if (def != data)
++		WREG32_PCIE(smnPCIE_CI_CNTL, data);
+ }
+ 
+ const struct amdgpu_nbio_funcs nbio_v7_4_funcs = {
+-- 
+2.17.1
+