[PATCH v4,1/2] media: mediatek: vcodec: Force capture queue format to MM21

[Yunfei Dong]

While the decoder can produce frames in both MM21 and MT21C formats, only MM21
is currently supported by userspace tools (like gstreamer and libyuv). In order
to ensure userspace keeps working after the SCP firmware is updated to support
both MM21 and MT21C formats, force the MM21 format for the capture queue.

This is meant as a stopgap solution while dynamic format switching between
MM21 and MT21C isn't implemented in the driver.

Fixes: 7501edef6b1f ("media: mediatek: vcodec: Different codec using different capture format")
Signed-off-by: Yunfei Dong <yunfei.dong at mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
changed with v3:
- re-write commit message.
- add one new patch to fix v4l2-compliance fail.
changed with v2:
- re-write commit message.
- change the driver flow.
changed with v1:
- add Fixes tag.
---
 .../platform/mediatek/vcodec/mtk_vcodec_dec.c | 24 +++----------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
index 641f533c417f..c99705681a03 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
@@ -39,10 +39,9 @@ static bool mtk_vdec_get_cap_fmt(struct mtk_vcodec_ctx *ctx, int format_index)
 {
 	const struct mtk_vcodec_dec_pdata *dec_pdata = ctx->dev->vdec_pdata;
 	const struct mtk_video_fmt *fmt;
-	struct mtk_q_data *q_data;
 	int num_frame_count = 0, i;
-	bool ret = true;
 
+	fmt = &dec_pdata->vdec_formats[format_index];
 	for (i = 0; i < *dec_pdata->num_formats; i++) {
 		if (dec_pdata->vdec_formats[i].type != MTK_FMT_FRAME)
 			continue;
@@ -50,27 +49,10 @@ static bool mtk_vdec_get_cap_fmt(struct mtk_vcodec_ctx *ctx, int format_index)
 		num_frame_count++;
 	}
 
-	if (num_frame_count == 1)
+	if (num_frame_count == 1 || fmt->fourcc == V4L2_PIX_FMT_MM21)
 		return true;
 
-	fmt = &dec_pdata->vdec_formats[format_index];
-	q_data = &ctx->q_data[MTK_Q_DATA_SRC];
-	switch (q_data->fmt->fourcc) {
-	case V4L2_PIX_FMT_VP8_FRAME:
-		if (fmt->fourcc == V4L2_PIX_FMT_MM21)
-			ret = true;
-		break;
-	case V4L2_PIX_FMT_H264_SLICE:
-	case V4L2_PIX_FMT_VP9_FRAME:
-		if (fmt->fourcc == V4L2_PIX_FMT_MM21)
-			ret = false;
-		break;
-	default:
-		ret = true;
-		break;
-	}
-
-	return ret;
+	return false;
 }
 
 static struct mtk_q_data *mtk_vdec_get_q_data(struct mtk_vcodec_ctx *ctx,
-- 
2.25.1