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Subject[PATCH 4.19 31/50] drm/amd/display: Fix MST dp_blank REG_WAIT timeout
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>

commit 8c9d90eebd23b6d40ddf4ce5df5ca2b932336a06 upstream.

Need to blank stream before deallocate MST payload.

[drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us * 3000 tries - dce110_stream_encoder_dp_blank line:944
------------[ cut here ]------------
WARNING: CPU: 0 PID: 2201 at /var/lib/dkms/amdgpu/18.50-690240/build/amd/amdgpu/../display/dc/dc_helper.c:249 generic_reg_wait+0xe7/0x160 [amdgpu]
Call Trace:
dce110_stream_encoder_dp_blank+0x11c/0x180 [amdgpu]
core_link_disable_stream+0x40/0x230 [amdgpu]
? generic_reg_update_ex+0xdb/0x130 [amdgpu]
dce110_reset_hw_ctx_wrap+0xb7/0x1f0 [amdgpu]
dce110_apply_ctx_to_hw+0x30/0x430 [amdgpu]
? dce110_apply_ctx_for_surface+0x206/0x260 [amdgpu]
dc_commit_state+0x2ba/0x4d0 [amdgpu]
amdgpu_dm_atomic_commit_tail+0x297/0xd70 [amdgpu]
? amdgpu_bo_pin_restricted+0x58/0x260 [amdgpu]
? wait_for_completion_timeout+0x1f/0x120
? wait_for_completion_interruptible+0x1c/0x160
commit_tail+0x3d/0x60 [drm_kms_helper]
drm_atomic_helper_commit+0xf6/0x100 [drm_kms_helper]
drm_atomic_connector_commit_dpms+0xe5/0xf0 [drm]
drm_mode_obj_set_property_ioctl+0x14f/0x250 [drm]
drm_mode_connector_property_set_ioctl+0x2e/0x40 [drm]
drm_ioctl+0x1e0/0x430 [drm]
? drm_mode_connector_set_obj_prop+0x70/0x70 [drm]
? ep_read_events_proc+0xb0/0xb0
? ep_scan_ready_list.constprop.18+0x1e6/0x1f0
? timerqueue_add+0x52/0x80
amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
do_vfs_ioctl+0x90/0x5f0
SyS_ioctl+0x74/0x80
do_syscall_64+0x74/0x140
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
---[ end trace 3ed7b77a97d60f72 ]---

Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -2457,11 +2457,11 @@ void core_link_disable_stream(struct pip
{
struct dc *core_dc = pipe_ctx->stream->ctx->dc;

+ core_dc->hwss.blank_stream(pipe_ctx);
+
if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
deallocate_mst_payload(pipe_ctx);

- core_dc->hwss.blank_stream(pipe_ctx);
-
core_dc->hwss.disable_stream(pipe_ctx, option);

disable_link(pipe_ctx->stream->sink->link, pipe_ctx->stream->signal);

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