[PATCH 05/23] drm/amd/display: Add dmub hpd sense callback

[Alex Hung]

From: Roman Li <roman...@amd.com>

[WHY]
HPD sense notification has been implemented in DMUB, which
can occur during low power states and need to be
notified from firmware to driver.

[HOW]
Define callback and register new HPD sense notification.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlaus...@amd.com>
Signed-off-by: Roman Li <roman...@amd.com>
Signed-off-by: Alex Hung <alex.h...@amd.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 20 +++++++++++++++++++
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  2 +-
 2 files changed, 21 insertions(+), 1 deletion(-)

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 a3edaf658ae0..c77982245f60 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -807,6 +807,20 @@ static void dmub_hpd_callback(struct amdgpu_device *adev,
        }
 }
 
+/**
+ * dmub_hpd_sense_callback - DMUB HPD sense processing callback.
+ * @adev: amdgpu_device pointer
+ * @notify: dmub notification structure
+ *
+ * HPD sense changes can occur during low power states and need to be
+ * notified from firmware to driver.
+ */
+static void dmub_hpd_sense_callback(struct amdgpu_device *adev,
+                             struct dmub_notification *notify)
+{
+       DRM_DEBUG_DRIVER("DMUB HPD SENSE callback.\n");
+}
+
 /**
  * register_dmub_notify_callback - Sets callback for DMUB notify
  * @adev: amdgpu_device pointer
@@ -3808,6 +3822,12 @@ static int register_hpd_handlers(struct amdgpu_device 
*adev)
                        DRM_ERROR("amdgpu: fail to register dmub hpd callback");
                        return -EINVAL;
                }
+
+               if (!register_dmub_notify_callback(adev, 
DMUB_NOTIFICATION_HPD_SENSE_NOTIFY,
+                       dmub_hpd_sense_callback, true)) {
+                       DRM_ERROR("amdgpu: fail to register dmub hpd sense 
callback");
+                       return -EINVAL;
+               }
        }
 
        list_for_each_entry(connector,
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h 
b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
index 2d7755e2b6c3..15d4690c74d6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
@@ -50,7 +50,7 @@
 
 #define AMDGPU_DM_MAX_NUM_EDP 2
 
-#define AMDGPU_DMUB_NOTIFICATION_MAX 6
+#define AMDGPU_DMUB_NOTIFICATION_MAX 7
 
 #define HDMI_AMD_VENDOR_SPECIFIC_DATA_BLOCK_IEEE_REGISTRATION_ID 0x00001A
 #define AMD_VSDB_VERSION_3_FEATURECAP_REPLAYMODE 0x40
-- 
2.34.1