From e7da754b00ee40af55e522f9dc478d8ed3a3ad3d Mon Sep 17 00:00:00 2001 From: Monk Liu Date: Tue, 24 Sep 2019 16:08:00 +0800 Subject: drm/amdgpu: fix an UMC hw arbitrator bug(v3) issue: the UMC6 h/w bug is that when MCLK is doing the switch in the middle of a page access being preempted by high priority client (e.g. DISPLAY) then UMC and the mclk switch would stuck there due to deadlock how: fixed by disabling auto PreChg for UMC to avoid high priority client preempting other client's access on the same page, thus the deadlock could be avoided v2: put the patch in callback of UMC6 v3: rename the callback to "init_registers" Signed-off-by: Monk Liu Reviewed-by: Alex Deucher Reviewed-by: Hawking Zhang Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/umc_v6_0.c | 37 +++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 drivers/gpu/drm/amd/amdgpu/umc_v6_0.c (limited to 'drivers/gpu/drm/amd/amdgpu/umc_v6_0.c') diff --git a/drivers/gpu/drm/amd/amdgpu/umc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/umc_v6_0.c new file mode 100644 index 000000000000..0d6b50528d76 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/umc_v6_0.c @@ -0,0 +1,37 @@ +/* + * Copyright 2019 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + */ +#include "umc_v6_0.h" +#include "amdgpu.h" + +static void umc_v6_0_init_registers(struct amdgpu_device *adev) +{ + unsigned i,j; + + for (i = 0; i < 4; i++) + for (j = 0; j < 4; j++) + WREG32((i*0x100000 + 0x5010c + j*0x2000)/4, 0x1002); +} + +const struct amdgpu_umc_funcs umc_v6_0_funcs = { + .init_registers = umc_v6_0_init_registers, +}; -- cgit v1.2.3