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drm/amd/display: Add polling method to handle MST reply packet

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[Why]
Specific TBT4 dock doesn't send out short HPD to notify source
that IRQ event DOWN_REP_MSG_RDY is set. Which violates the spec
and cause source can't send out streams to mst sinks.

[How]
To cover this misbehavior, add an additional polling method to detect
DOWN_REP_MSG_RDY is set. HPD driven handling method is still kept.
Just hook up our handler to drm mgr->cbs->poll_hpd_irq().

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jerry Zuo <jerry.zuo@amd.com>
Acked-by: Alan Liu <haoping.liu@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wayne Lin
2022-03-09 17:05:05 +08:00
committed by Alex Deucher
parent c4e532f753
commit bb4fa525f3
4 changed files with 159 additions and 86 deletions
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7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
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@@ -194,6 +194,11 @@ struct hpd_rx_irq_offload_work_queue {
* we're handling link loss
*/
bool is_handling_link_loss;
/**
* @is_handling_mst_msg_rdy_event: Used to prevent inserting mst message
* ready event when we're already handling mst message ready event
*/
bool is_handling_mst_msg_rdy_event;
/**
* @aconnector: The aconnector that this work queue is attached to
*/
@@ -638,6 +643,8 @@ struct amdgpu_dm_connector {
struct drm_dp_mst_port *mst_output_port;
struct amdgpu_dm_connector *mst_root;
struct drm_dp_aux *dsc_aux;
struct mutex handle_mst_msg_ready;
/* TODO see if we can merge with ddc_bus or make a dm_connector */
struct amdgpu_i2c_adapter *i2c;