Based on https://libreplanet.org/wiki/Group:Hardware/research/gpu/radeon

diff -ru source.orig/drivers/gpu/drm/radeon/btc_dpm.c source/drivers/gpu/drm/radeon/btc_dpm.c
--- source.orig/drivers/gpu/drm/radeon/btc_dpm.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/btc_dpm.c	2023-02-13 15:50:41.218608376 -0500
@@ -2437,7 +2437,6 @@
 	ret = rv770_upload_firmware(rdev);
 	if (ret) {
 		DRM_ERROR("rv770_upload_firmware failed\n");
-		return ret;
 	}
 	ret = cypress_get_table_locations(rdev);
 	if (ret) {
diff -ru source.orig/drivers/gpu/drm/radeon/ci_dpm.c source/drivers/gpu/drm/radeon/ci_dpm.c
--- source.orig/drivers/gpu/drm/radeon/ci_dpm.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/ci_dpm.c	2023-02-13 15:53:38.591724496 -0500
@@ -5157,7 +5157,6 @@
 	ret = ci_upload_firmware(rdev);
 	if (ret) {
 		DRM_ERROR("ci_upload_firmware failed\n");
-		return ret;
 	}
 	ret = ci_process_firmware_header(rdev);
 	if (ret) {
diff -ru source.orig/drivers/gpu/drm/radeon/cik.c source/drivers/gpu/drm/radeon/cik.c
--- source.orig/drivers/gpu/drm/radeon/cik.c	2023-02-13 15:21:35.174999782 -0500
+++ source/drivers/gpu/drm/radeon/cik.c	2023-02-13 15:47:37.149601121 -0500
@@ -8285,7 +8285,6 @@
 		r = ci_mc_load_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load MC firmware!\n");
-			return r;
 		}
 	}
 
@@ -8591,7 +8590,6 @@
 			r = cik_init_microcode(rdev);
 			if (r) {
 				DRM_ERROR("Failed to load firmware!\n");
-				return r;
 			}
 		}
 	} else {
@@ -8601,7 +8599,6 @@
 			r = cik_init_microcode(rdev);
 			if (r) {
 				DRM_ERROR("Failed to load firmware!\n");
-				return r;
 			}
 		}
 	}
@@ -8668,7 +8665,6 @@
 	 */
 	if (!rdev->mc_fw && !(rdev->flags & RADEON_IS_IGP)) {
 		DRM_ERROR("radeon: MC ucode required for NI+.\n");
-		return -EINVAL;
 	}
 
 	return 0;
diff -ru source.orig/drivers/gpu/drm/radeon/cypress_dpm.c source/drivers/gpu/drm/radeon/cypress_dpm.c
--- source.orig/drivers/gpu/drm/radeon/cypress_dpm.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/cypress_dpm.c	2023-02-13 15:50:25.130869935 -0500
@@ -1862,7 +1862,6 @@
 	ret = rv770_upload_firmware(rdev);
 	if (ret) {
 		DRM_ERROR("rv770_upload_firmware failed\n");
-		return ret;
 	}
 
 	ret = cypress_get_table_locations(rdev);
diff -ru source.orig/drivers/gpu/drm/radeon/evergreen.c source/drivers/gpu/drm/radeon/evergreen.c
--- source.orig/drivers/gpu/drm/radeon/evergreen.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/evergreen.c	2023-02-13 15:47:50.457384749 -0500
@@ -5018,7 +5018,6 @@
 		r = ni_mc_load_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load MC firmware!\n");
-			return r;
 		}
 	}
 
@@ -5235,7 +5234,6 @@
 			r = ni_init_microcode(rdev);
 			if (r) {
 				DRM_ERROR("Failed to load firmware!\n");
-				return r;
 			}
 		}
 	} else {
@@ -5243,7 +5241,6 @@
 			r = r600_init_microcode(rdev);
 			if (r) {
 				DRM_ERROR("Failed to load firmware!\n");
-				return r;
 			}
 		}
 	}
@@ -5289,7 +5286,6 @@
 	if (ASIC_IS_DCE5(rdev)) {
 		if (!rdev->mc_fw && !(rdev->flags & RADEON_IS_IGP)) {
 			DRM_ERROR("radeon: MC ucode required for NI+.\n");
-			return -EINVAL;
 		}
 	}
 
diff -ru source.orig/drivers/gpu/drm/radeon/ni.c source/drivers/gpu/drm/radeon/ni.c
--- source.orig/drivers/gpu/drm/radeon/ni.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/ni.c	2023-02-13 15:46:45.402442454 -0500
@@ -2163,7 +2163,6 @@
 		r = ni_mc_load_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load MC firmware!\n");
-			return r;
 		}
 	}
 
@@ -2390,7 +2389,6 @@
 			r = ni_init_microcode(rdev);
 			if (r) {
 				DRM_ERROR("Failed to load firmware!\n");
-				return r;
 			}
 		}
 	} else {
@@ -2398,7 +2396,6 @@
 			r = ni_init_microcode(rdev);
 			if (r) {
 				DRM_ERROR("Failed to load firmware!\n");
-				return r;
 			}
 		}
 	}
@@ -2453,7 +2450,6 @@
 	 */
 	if (!rdev->mc_fw && !(rdev->flags & RADEON_IS_IGP)) {
 		DRM_ERROR("radeon: MC ucode required for NI+.\n");
-		return -EINVAL;
 	}
 
 	return 0;
diff -ru source.orig/drivers/gpu/drm/radeon/r100.c source/drivers/gpu/drm/radeon/r100.c
--- source.orig/drivers/gpu/drm/radeon/r100.c	2023-02-13 15:21:35.174999782 -0500
+++ source/drivers/gpu/drm/radeon/r100.c	2023-02-13 15:49:15.548001277 -0500
@@ -1134,7 +1134,6 @@
 		r = r100_cp_init_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load firmware!\n");
-			return r;
 		}
 	}
 
diff -ru source.orig/drivers/gpu/drm/radeon/r600.c source/drivers/gpu/drm/radeon/r600.c
--- source.orig/drivers/gpu/drm/radeon/r600.c	2023-02-13 15:21:35.174999782 -0500
+++ source/drivers/gpu/drm/radeon/r600.c	2023-02-13 15:46:07.291062125 -0500
@@ -3299,7 +3299,6 @@
 		r = r600_init_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load firmware!\n");
-			return r;
 		}
 	}
 
diff -ru source.orig/drivers/gpu/drm/radeon/rv770.c source/drivers/gpu/drm/radeon/rv770.c
--- source.orig/drivers/gpu/drm/radeon/rv770.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/rv770.c	2023-02-13 15:26:54.385808292 -0500
@@ -1966,7 +1966,6 @@
 		r = r600_init_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load firmware!\n");
-			return r;
 		}
 	}
 
diff -ru source.orig/drivers/gpu/drm/radeon/rv770_dpm.c source/drivers/gpu/drm/radeon/rv770_dpm.c
--- source.orig/drivers/gpu/drm/radeon/rv770_dpm.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/rv770_dpm.c	2023-02-13 15:50:13.591057564 -0500
@@ -1948,12 +1948,10 @@
 	ret = rv770_upload_firmware(rdev);
 	if (ret) {
 		DRM_ERROR("rv770_upload_firmware failed\n");
-		return ret;
 	}
 	ret = rv770_init_smc_table(rdev, boot_ps);
 	if (ret) {
 		DRM_ERROR("rv770_init_smc_table failed\n");
-		return ret;
 	}
 
 	rv770_program_response_times(rdev);
diff -ru source.orig/drivers/gpu/drm/radeon/si.c source/drivers/gpu/drm/radeon/si.c
--- source.orig/drivers/gpu/drm/radeon/si.c	2023-02-13 15:21:35.178999717 -0500
+++ source/drivers/gpu/drm/radeon/si.c	2023-02-13 15:47:00.042204445 -0500
@@ -6619,7 +6619,6 @@
 		r = si_mc_load_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load MC firmware!\n");
-			return r;
 		}
 	}
 
@@ -6867,7 +6866,6 @@
 		r = si_init_microcode(rdev);
 		if (r) {
 			DRM_ERROR("Failed to load firmware!\n");
-			return r;
 		}
 	}
 
@@ -6926,7 +6924,6 @@
 	 */
 	if (!rdev->mc_fw) {
 		DRM_ERROR("radeon: MC ucode required for NI+.\n");
-		return -EINVAL;
 	}
 
 	return 0;
diff -ru source.orig/drivers/gpu/drm/radeon/si_dpm.c source/drivers/gpu/drm/radeon/si_dpm.c
--- source.orig/drivers/gpu/drm/radeon/si_dpm.c	2021-10-31 16:53:10.000000000 -0400
+++ source/drivers/gpu/drm/radeon/si_dpm.c	2023-02-13 15:53:00.844338238 -0500
@@ -6366,7 +6366,6 @@
 	ret = si_upload_firmware(rdev);
 	if (ret) {
 		DRM_ERROR("si_upload_firmware failed\n");
-		return ret;
 	}
 	ret = si_process_firmware_header(rdev);
 	if (ret) {
