drm/amd/display: Add more DC HW state info to underflow logging

[Why]
Debugging underflow issues frequently requires knowing the
HW state at the time of underflow. To enable capturing this
HW state information, interface functions are needed for the
various DC HW blocks.

[How]
This change adds the interface functions to read HW state for
the following DC HW blocks:
- HUBBUB
- HUBP
- DPP
- MPC
- OPP
- DSC
- OPTC
- DCCG

Reviewed-by: George Shen <george.shen@amd.com>
Signed-off-by: Karen Chen <Karen.Chen@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h b/drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
index 22960ee03dee..a8d1abe20f62 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/mpc.h
@@ -350,6 +350,15 @@ struct mpcc_state {
 	struct mpc_rmcm_regs rmcm_regs;
 };
 
+struct dcn_mpc_reg_state {
+	uint32_t mpcc_bot_sel;
+	uint32_t mpcc_control;
+	uint32_t mpcc_status;
+	uint32_t mpcc_top_sel;
+	uint32_t mpcc_opp_id;
+	uint32_t mpcc_ogam_control;
+};
+
 /**
  * struct mpc_funcs - funcs
  */
@@ -373,6 +382,24 @@ struct mpc_funcs {
 			struct mpc *mpc,
 			int mpcc_inst,
 			struct mpcc_state *s);
+	/**
+    * @mpc_read_reg_state:
+    *
+    * Read MPC register state for debugging underflow purposes.
+    *
+    * Parameters:
+    *
+    * - [in] mpc - MPC context
+    * - [out] reg_state - MPC register state structure
+    *
+    * Return:
+    *
+    * void
+    */
+	void (*mpc_read_reg_state)(
+			struct mpc *mpc,
+			int mpcc_inst,
+			struct dcn_mpc_reg_state *mpc_reg_state);
 
 	/**
 	* @insert_plane: