diff --git a/drivers/gpu/drm/vkms/tests/vkms_format_test.c b/drivers/gpu/drm/vkms/tests/vkms_format_test.c
index 4f565ecb591c34b08d9df577860488702200a384..1d9a6515ce44f56fc3032f9aad2d11591bb71a68 100644
--- a/drivers/gpu/drm/vkms/tests/vkms_format_test.c
+++ b/drivers/gpu/drm/vkms/tests/vkms_format_test.c
@@ -226,7 +226,8 @@ static void vkms_format_test_yuv_u8_to_argb_u16(struct kunit *test)
 		get_conversion_matrix_to_argb_u16
 			(DRM_FORMAT_NV12, param->encoding, param->range, &matrix);
 
-		argb = argb_u16_from_yuv888(color->yuv.y, color->yuv.u, color->yuv.v, &matrix);
+		argb = argb_u16_from_yuv161616(&matrix, color->yuv.y * 257, color->yuv.u * 257,
+					       color->yuv.v * 257);
 
 		KUNIT_EXPECT_LE_MSG(test, abs_diff(argb.a, color->argb.a), 257,
 				    "On the A channel of the color %s expected 0x%04x, got 0x%04x",
diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c
index f73d3de33807644a7f7294a4dc8b9de2bec6e427..668c3a88a1f3e7d4e3c492a428bc487291392da2 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.c
+++ b/drivers/gpu/drm/vkms/vkms_formats.c
@@ -279,16 +279,17 @@ static struct pixel_argb_u16 argb_u16_from_BGR565(const __le16 *pixel)
 	return out_pixel;
 }
 
-VISIBLE_IF_KUNIT struct pixel_argb_u16 argb_u16_from_yuv888(u8 y, u8 channel_1, u8 channel_2,
-							    const struct conversion_matrix *matrix)
+VISIBLE_IF_KUNIT
+struct pixel_argb_u16 argb_u16_from_yuv161616(const struct conversion_matrix *matrix,
+					      u16 y, u16 channel_1, u16 channel_2)
 {
 	u16 r, g, b;
 	s64 fp_y, fp_channel_1, fp_channel_2;
 	s64 fp_r, fp_g, fp_b;
 
-	fp_y = drm_int2fixp(((int)y - matrix->y_offset) * 257);
-	fp_channel_1 = drm_int2fixp(((int)channel_1 - 128) * 257);
-	fp_channel_2 = drm_int2fixp(((int)channel_2 - 128) * 257);
+	fp_y = drm_int2fixp((int)y - matrix->y_offset * 257);
+	fp_channel_1 = drm_int2fixp((int)channel_1 - 128 * 257);
+	fp_channel_2 = drm_int2fixp((int)channel_2 - 128 * 257);
 
 	fp_r = drm_fixp_mul(matrix->matrix[0][0], fp_y) +
 	       drm_fixp_mul(matrix->matrix[0][1], fp_channel_1) +
@@ -310,7 +311,7 @@ VISIBLE_IF_KUNIT struct pixel_argb_u16 argb_u16_from_yuv888(u8 y, u8 channel_1,
 
 	return argb_u16_from_u16161616(0xffff, r, g, b);
 }
-EXPORT_SYMBOL_IF_KUNIT(argb_u16_from_yuv888);
+EXPORT_SYMBOL_IF_KUNIT(argb_u16_from_yuv161616);
 
 /**
  * READ_LINE() - Generic generator for a read_line function which can be used for format with one
@@ -505,8 +506,8 @@ static void semi_planar_yuv_read_line(const struct vkms_plane_state *plane, int
 	const struct conversion_matrix *conversion_matrix = &plane->conversion_matrix;
 
 	for (int i = 0; i < count; i++) {
-		*out_pixel = argb_u16_from_yuv888(y_plane[0], uv_plane[0], uv_plane[1],
-						  conversion_matrix);
+		*out_pixel = argb_u16_from_yuv161616(conversion_matrix, y_plane[0] * 257,
+						     uv_plane[0] * 257, uv_plane[1] * 257);
 		out_pixel += 1;
 		y_plane += step_y;
 		if ((i + subsampling_offset + 1) % subsampling == 0)
@@ -550,8 +551,9 @@ static void planar_yuv_read_line(const struct vkms_plane_state *plane, int x_sta
 	const struct conversion_matrix *conversion_matrix = &plane->conversion_matrix;
 
 	for (int i = 0; i < count; i++) {
-		*out_pixel = argb_u16_from_yuv888(*y_plane, *channel_1_plane, *channel_2_plane,
-						  conversion_matrix);
+		*out_pixel = argb_u16_from_yuv161616(conversion_matrix,
+						     *y_plane * 257, *channel_1_plane * 257,
+						     *channel_2_plane * 257);
 		out_pixel += 1;
 		y_plane += step_y;
 		if ((i + subsampling_offset + 1) % subsampling == 0) {
@@ -683,9 +685,9 @@ pixel_read_line_t get_pixel_read_line_function(u32 format)
 	case DRM_FORMAT_BGRX8888:
 		return &BGRX8888_read_line;
 	case DRM_FORMAT_RGB888:
-		return RGB888_read_line;
+		return &RGB888_read_line;
 	case DRM_FORMAT_BGR888:
-		return BGR888_read_line;
+		return &BGR888_read_line;
 	case DRM_FORMAT_ARGB16161616:
 		return &ARGB16161616_read_line;
 	case DRM_FORMAT_ABGR16161616:
diff --git a/drivers/gpu/drm/vkms/vkms_formats.h b/drivers/gpu/drm/vkms/vkms_formats.h
index b4fe62ab9c65d465925d29911f26612193a80799..eeb208cdd6b1be9676b4706e0e3cbb2ad7efe067 100644
--- a/drivers/gpu/drm/vkms/vkms_formats.h
+++ b/drivers/gpu/drm/vkms/vkms_formats.h
@@ -14,8 +14,8 @@ void get_conversion_matrix_to_argb_u16(u32 format, enum drm_color_encoding encod
 				       struct conversion_matrix *matrix);
 
 #if IS_ENABLED(CONFIG_KUNIT)
-struct pixel_argb_u16 argb_u16_from_yuv888(u8 y, u8 channel_1, u8 channel_2,
-					   const struct conversion_matrix *matrix);
+struct pixel_argb_u16 argb_u16_from_yuv161616(const struct conversion_matrix *matrix,
+					      u16 y, u16 channel_1, u16 channel_2);
 #endif
 
 #endif /* _VKMS_FORMATS_H_ */
