| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 182/201] drm/amd/display: Reset DMCUB before HW init | Date | Wed, 27 Jul 2022 18:11:26 +0200 |
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From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
commit 791255ca9fbe38042cfd55df5deb116dc11fef18 upstream.
[Why] If the firmware wasn't reset by PSP or HW and is currently running then the firmware will hang or perform underfined behavior when we modify its firmware state underneath it.
[How] Reset DMCUB before setting up cache windows and performing HW init.
Reviewed-by: Aurabindo Jayamohanan Pillai <Aurabindo.Pillai@amd.com> Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: "Limonciello, Mario" <Mario.Limonciello@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1028,6 +1028,11 @@ static int dm_dmub_hw_init(struct amdgpu return 0; } + /* Reset DMCUB if it was previously running - before we overwrite its memory. */ + status = dmub_srv_hw_reset(dmub_srv); + if (status != DMUB_STATUS_OK) + DRM_WARN("Error resetting DMUB HW: %d\n", status); + hdr = (const struct dmcub_firmware_header_v1_0 *)dmub_fw->data; fw_inst_const = dmub_fw->data +
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