drm/amd/display: Add helpers to get DMUB FW boot options

[Why & How]
To query the bits and print them out for debug purposes.
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alan Liu <haoping.liu@amd.com>
Signed-off-by: Cruise Hung <cruise.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dmub/dmub_srv.h

@@ -378,6 +378,7 @@ struct dmub_srv_hw_funcs {
 
 	union dmub_fw_boot_status (*get_fw_status)(struct dmub_srv *dmub);
 
+	union dmub_fw_boot_options (*get_fw_boot_option)(struct dmub_srv *dmub);
 
 	void (*set_gpint)(struct dmub_srv *dmub,
 			  union dmub_gpint_data_register reg);
@@ -778,6 +779,9 @@ void dmub_flush_buffer_mem(const struct dmub_fb *fb);
 enum dmub_status dmub_srv_get_fw_boot_status(struct dmub_srv *dmub,
 					     union dmub_fw_boot_status *status);
 
+enum dmub_status dmub_srv_get_fw_boot_option(struct dmub_srv *dmub,
+					     union dmub_fw_boot_options *option);
+
 enum dmub_status dmub_srv_cmd_with_reply_data(struct dmub_srv *dmub,
 					      union dmub_rb_cmd *cmd);
 

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.c

@@ -352,6 +352,14 @@ union dmub_fw_boot_status dmub_dcn31_get_fw_boot_status(struct dmub_srv *dmub)
 	return status;
 }
 
+union dmub_fw_boot_options dmub_dcn31_get_fw_boot_option(struct dmub_srv *dmub)
+{
+	union dmub_fw_boot_options option;
+
+	option.all = REG_READ(DMCUB_SCRATCH14);
+	return option;
+}
+
 void dmub_dcn31_enable_dmub_boot_options(struct dmub_srv *dmub, const struct dmub_srv_hw_params *params)
 {
 	union dmub_fw_boot_options boot_options = {0};

drivers/gpu/drm/amd/display/dmub/src/dmub_dcn31.h

@@ -239,6 +239,8 @@ void dmub_dcn31_skip_dmub_panel_power_sequence(struct dmub_srv *dmub, bool skip)
 
 union dmub_fw_boot_status dmub_dcn31_get_fw_boot_status(struct dmub_srv *dmub);
 
+union dmub_fw_boot_options dmub_dcn31_get_fw_boot_option(struct dmub_srv *dmub);
+
 void dmub_dcn31_setup_outbox0(struct dmub_srv *dmub,
 			      const struct dmub_region *outbox0);
 

drivers/gpu/drm/amd/display/dmub/src/dmub_srv.c

@@ -255,6 +255,7 @@ static bool dmub_srv_hw_setup(struct dmub_srv *dmub, enum dmub_asic asic)
 		funcs->get_gpint_response = dmub_dcn31_get_gpint_response;
 		funcs->get_gpint_dataout = dmub_dcn31_get_gpint_dataout;
 		funcs->get_fw_status = dmub_dcn31_get_fw_boot_status;
+		funcs->get_fw_boot_option = dmub_dcn31_get_fw_boot_option;
 		funcs->enable_dmub_boot_options = dmub_dcn31_enable_dmub_boot_options;
 		funcs->skip_dmub_panel_power_sequence = dmub_dcn31_skip_dmub_panel_power_sequence;
 		//outbox0 call stacks
@@ -846,6 +847,20 @@ enum dmub_status dmub_srv_get_fw_boot_status(struct dmub_srv *dmub,
 	return DMUB_STATUS_OK;
 }
 
+enum dmub_status dmub_srv_get_fw_boot_option(struct dmub_srv *dmub,
+					     union dmub_fw_boot_options *option)
+{
+	option->all = 0;
+
+	if (!dmub->sw_init)
+		return DMUB_STATUS_INVALID;
+
+	if (dmub->hw_funcs.get_fw_boot_option)
+		*option = dmub->hw_funcs.get_fw_boot_option(dmub);
+
+	return DMUB_STATUS_OK;
+}
+
 enum dmub_status dmub_srv_cmd_with_reply_data(struct dmub_srv *dmub,
 					      union dmub_rb_cmd *cmd)
 {