diff options
| author | Qingqing Zhuo <qingqing.zhuo@amd.com> | 2020-11-23 17:56:35 -0500 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2020-12-08 23:04:26 -0500 |
| commit | 3083a9845e1258ee8c2126d37f7b41897fad02e5 (patch) | |
| tree | dade698e633f20a8a429bda5bf2fe1b11511d54e /drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | |
| parent | 5a83bf80723dbc18d2f4d3949466bab216225c30 (diff) | |
drm/amd/display: Only one display lights up while using MST hub
[Why]
With the addition of dc_lock acquire before dc_link_handle_hpd_rx_irq,
there will be a deadlock situation where commit state sends a request
for payload allocation on MST and wait for HPD to process DOWN_REP.
[How]
Move forward the MST message handling in handle_hpd_rx_irq so that
it will not rely on call to dc_link_handle_hpd_rx_irq.
Signed-off-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index c8e279f05c72..508457cca343 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -2563,11 +2563,9 @@ static void handle_hpd_rx_irq(void *param) bool result = false; enum dc_connection_type new_connection_type = dc_connection_none; struct amdgpu_device *adev = drm_to_adev(dev); -#ifdef CONFIG_DRM_AMD_DC_HDCP union hpd_irq_data hpd_irq_data; memset(&hpd_irq_data, 0, sizeof(hpd_irq_data)); -#endif /* * TODO:Temporary add mutex to protect hpd interrupt not have a gpio @@ -2577,6 +2575,21 @@ static void handle_hpd_rx_irq(void *param) if (dc_link->type != dc_connection_mst_branch) mutex_lock(&aconnector->hpd_lock); + read_hpd_rx_irq_data(dc_link, &hpd_irq_data); + + if ((dc_link->cur_link_settings.lane_count != LANE_COUNT_UNKNOWN) || + (dc_link->type == dc_connection_mst_branch)) { + if (hpd_irq_data.bytes.device_service_irq.bits.UP_REQ_MSG_RDY) { + result = true; + dm_handle_hpd_rx_irq(aconnector); + goto out; + } else if (hpd_irq_data.bytes.device_service_irq.bits.DOWN_REP_MSG_RDY) { + result = false; + dm_handle_hpd_rx_irq(aconnector); + goto out; + } + } + mutex_lock(&adev->dm.dc_lock); #ifdef CONFIG_DRM_AMD_DC_HDCP result = dc_link_handle_hpd_rx_irq(dc_link, &hpd_irq_data, NULL); @@ -2585,6 +2598,7 @@ static void handle_hpd_rx_irq(void *param) #endif mutex_unlock(&adev->dm.dc_lock); +out: if (result && !is_mst_root_connector) { /* Downstream Port status changed. */ if (!dc_link_detect_sink(dc_link, &new_connection_type)) @@ -2625,9 +2639,6 @@ static void handle_hpd_rx_irq(void *param) hdcp_handle_cpirq(adev->dm.hdcp_workqueue, aconnector->base.index); } #endif - if ((dc_link->cur_link_settings.lane_count != LANE_COUNT_UNKNOWN) || - (dc_link->type == dc_connection_mst_branch)) - dm_handle_hpd_rx_irq(aconnector); if (dc_link->type != dc_connection_mst_branch) { drm_dp_cec_irq(&aconnector->dm_dp_aux.aux); |