staging: tidspbridge: overwrite DSP error codes

When calling the DSP's remote functions, the DSP returns error
codes different from the ones managed by the kernel, the
function's return value is shared with the MPU using a shared
structure. This patch overwrites those error codes by kernel
specifics and deletes unnecessary code.

Signed-off-by: Rene Sapiens <rene.sapiens@ti.com>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>

drivers/staging/tidspbridge/rmgr/disp.c

@@ -460,17 +460,6 @@ int disp_node_create(struct disp_object *disp_obj,
 		DBC_ASSERT(ul_bytes < (RMS_COMMANDBUFSIZE * sizeof(rms_word)));
 		status = send_message(disp_obj, node_get_timeout(hnode),
 				      ul_bytes, node_env);
-		if (status >= 0) {
-			/*
-			 * Message successfully received from RMS.
-			 * Return the status of the Node's create function
-			 * on the DSP-side
-			 */
-			status = (((rms_word *) (disp_obj->pbuf))[0]);
-			if (status < 0)
-				dev_dbg(bridge, "%s: DSP-side failed: 0x%x\n",
-					__func__, status);
-		}
 	}
 func_end:
 	return status;
@@ -513,18 +502,6 @@ int disp_node_delete(struct disp_object *disp_obj,
 			status = send_message(disp_obj, node_get_timeout(hnode),
 					      sizeof(struct rms_command),
 					      &dw_arg);
-			if (status >= 0) {
-				/*
-				 * Message successfully received from RMS.
-				 * Return the status of the Node's delete
-				 * function on the DSP-side
-				 */
-				status = (((rms_word *) (disp_obj->pbuf))[0]);
-				if (status < 0)
-					dev_dbg(bridge, "%s: DSP-side failed: "
-						"0x%x\n", __func__, status);
-			}
-
 		}
 	}
 	return status;
@@ -566,18 +543,6 @@ int disp_node_run(struct disp_object *disp_obj,
 			status = send_message(disp_obj, node_get_timeout(hnode),
 					      sizeof(struct rms_command),
 					      &dw_arg);
-			if (status >= 0) {
-				/*
-				 * Message successfully received from RMS.
-				 * Return the status of the Node's execute
-				 * function on the DSP-side
-				 */
-				status = (((rms_word *) (disp_obj->pbuf))[0]);
-				if (status < 0)
-					dev_dbg(bridge, "%s: DSP-side failed: "
-						"0x%x\n", __func__, status);
-			}
-
 		}
 	}
 
@@ -739,7 +704,14 @@ static int send_message(struct disp_object *disp_obj, u32 timeout,
 		} else {
 			if (CHNL_IS_IO_COMPLETE(chnl_ioc_obj)) {
 				DBC_ASSERT(chnl_ioc_obj.pbuf == pbuf);
-				status = (*((rms_word *) chnl_ioc_obj.pbuf));
+				if (*((int *)chnl_ioc_obj.pbuf) < 0) {
+					/* Translate DSP's to kernel error */
+					status = -EREMOTEIO;
+					dev_dbg(bridge, "%s: DSP-side failed:"
+						" DSP errcode = 0x%x, Kernel "
+						"errcode = %d\n", __func__,
+						*(int *)pbuf, status);
+				}
 				*pdw_arg =
 				    (((rms_word *) (chnl_ioc_obj.pbuf))[1]);
 			} else {