media: vicodec: improve handling of uncompressable planes

Exit the loop immediately once it is clear that the plane
cannot be compressed. Also clear the PCODED bit and fix the
PCODED check (it should check for the bit) in the caller code.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/vicodec/vicodec-codec.c

@@ -685,9 +685,6 @@ static u32 encode_plane(u8 *input, u8 *refp, __be16 **rlco, __be16 *rlco_max,
 			input += 8 * input_step;
 			refp += 8 * 8;
 
-			if (encoding & FRAME_UNENCODED)
-				continue;
-
 			size = rlc(cf->coeffs, *rlco, blocktype);
 			if (last_size == size &&
 			    !memcmp(*rlco + 1, *rlco - size + 1, 2 * size - 2)) {
@@ -702,12 +699,16 @@ static u32 encode_plane(u8 *input, u8 *refp, __be16 **rlco, __be16 *rlco_max,
 			} else {
 				*rlco += size;
 			}
-			if (*rlco >= rlco_max)
+			if (*rlco >= rlco_max) {
 				encoding |= FRAME_UNENCODED;
+				goto exit_loop;
+			}
 			last_size = size;
 		}
 		input += width * 7 * input_step;
 	}
+
+exit_loop:
 	if (encoding & FRAME_UNENCODED) {
 		u8 *out = (u8 *)rlco_start;
 
@@ -721,6 +722,7 @@ static u32 encode_plane(u8 *input, u8 *refp, __be16 **rlco, __be16 *rlco_max,
 		for (i = 0; i < height * width; i++, input += input_step)
 			*out++ = (*input == 0xff) ? 0xfe : *input;
 		*rlco = (__be16 *)out;
+		encoding &= ~FRAME_PCODED;
 	}
 	return encoding;
 }

drivers/media/platform/vicodec/vicodec-core.c

@@ -281,7 +281,7 @@ static void encode(struct vicodec_ctx *ctx,
 
 	encoding = encode_frame(&rf, &ctx->ref_frame, &cf, !ctx->gop_cnt,
 				ctx->gop_cnt == ctx->gop_size - 1);
-	if (encoding != FRAME_PCODED)
+	if (!(encoding & FRAME_PCODED))
 		ctx->gop_cnt = 0;
 	if (++ctx->gop_cnt >= ctx->gop_size)
 		ctx->gop_cnt = 0;