drm/amdgpu/display: clean up hdcp workqueue handling

Use the existence of the workqueue itself to determine when to
enable HDCP features rather than sprinkling asic checks all over
the code.  Also add a check for the existence of the hdcp
workqueue in the irq handling on the off chance we get and HPD
RX interrupt with the CP bit set.  This avoids a crash if
the driver doesn't support HDCP for a particular asic.

Fixes: 96a3b32e67236f ("drm/amd/display: only enable HDCP for DCN+")
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=206519
Reviewed-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 63e8a12a74bcb5581ec949a630e7885c3a56615d..e8f66fbf399e54c130bfe61a3148a7bc254839fc 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1911,7 +1911,7 @@ static void handle_hpd_irq(void *param)
        mutex_lock(&aconnector->hpd_lock);
 
 #ifdef CONFIG_DRM_AMD_DC_HDCP
-       if (adev->asic_type >= CHIP_RAVEN)
+       if (adev->dm.hdcp_workqueue)
                hdcp_reset_display(adev->dm.hdcp_workqueue, aconnector->dc_link->link_index);
 #endif
        if (aconnector->fake_enable)
@@ -2088,8 +2088,10 @@ static void handle_hpd_rx_irq(void *param)
                }
        }
 #ifdef CONFIG_DRM_AMD_DC_HDCP
-       if (hpd_irq_data.bytes.device_service_irq.bits.CP_IRQ)
-               hdcp_handle_cpirq(adev->dm.hdcp_workqueue,  aconnector->base.index);
+           if (hpd_irq_data.bytes.device_service_irq.bits.CP_IRQ) {
+                   if (adev->dm.hdcp_workqueue)
+                           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))
@@ -5702,7 +5704,7 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
                drm_connector_attach_vrr_capable_property(
                        &aconnector->base);
 #ifdef CONFIG_DRM_AMD_DC_HDCP
-               if (adev->asic_type >= CHIP_RAVEN)
+               if (adev->dm.hdcp_workqueue)
                        drm_connector_attach_content_protection_property(&aconnector->base, true);
 #endif
        }