soc: qcom: mdt_loader: be more informative on errors

In __qcom_mdt_load() there are cases where an error occurs that
cause a message to be printed.  In some of those cases the errno
value can be helpful to understand exactly what caused the problem.

Print the errno (as well as the firmware file name) where it is
helpful, and in a few cases reword the error message.  Consistently
use the private fw_name for the file name.
Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20210315144455.1770492-1-elder@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/soc/qcom/mdt_loader.c

@@ -166,6 +166,8 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
 		metadata = qcom_mdt_read_metadata(fw, &metadata_len);
 		if (IS_ERR(metadata)) {
 			ret = PTR_ERR(metadata);
+			dev_err(dev, "error %d reading firmware %s metadata\n",
+				ret, fw_name);
 			goto out;
 		}
 
@@ -173,7 +175,9 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
 
 		kfree(metadata);
 		if (ret) {
-			dev_err(dev, "invalid firmware metadata\n");
+			/* Invalid firmware metadata */
+			dev_err(dev, "error %d initializing firmware %s\n",
+				ret, fw_name);
 			goto out;
 		}
 	}
@@ -199,7 +203,9 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
 			ret = qcom_scm_pas_mem_setup(pas_id, mem_phys,
 						     max_addr - min_addr);
 			if (ret) {
-				dev_err(dev, "unable to setup relocation\n");
+				/* Unable to set up relocation */
+				dev_err(dev, "error %d setting up firmware %s\n",
+					ret, fw_name);
 				goto out;
 			}
 		}
@@ -243,9 +249,8 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
 		if (phdr->p_filesz && phdr->p_offset < fw->size) {
 			/* Firmware is large enough to be non-split */
 			if (phdr->p_offset + phdr->p_filesz > fw->size) {
-				dev_err(dev,
-					"failed to load segment %d from truncated file %s\n",
-					i, firmware);
+				dev_err(dev, "file %s segment %d would be truncated\n",
+					fw_name, i);
 				ret = -EINVAL;
 				break;
 			}
@@ -257,7 +262,8 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
 			ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
 							ptr, phdr->p_filesz);
 			if (ret) {
-				dev_err(dev, "failed to load %s\n", fw_name);
+				dev_err(dev, "error %d loading %s\n",
+					ret, fw_name);
 				break;
 			}