Re: [PATCH v2] media: mediatek: vcodec: Force capture queue format to MM21

["Yunfei Dong (董云飞)" <Yunfei.Dong@mediatek.com>]

Hi Nicolas,

Thanks for your suggestion.
On Wed, 2023-02-22 at 16:11 -0500, Nícolas F. R. A. Prado wrote:
> Hi,
> 
> On Tue, Feb 14, 2023 at 02:28:04AM +0000, Yunfei Dong (董云飞) wrote:
> > Hi Nicolas,
> > 
> > Thanks for your suggestion.
> > On Fri, 2023-02-10 at 10:36 -0500, Nicolas Dufresne wrote:
> > > Le vendredi 10 février 2023 à 13:55 +0800, Yunfei Dong a écrit :
> > > > In order to conver the format of capture queue from mediatek
> > > > MM21
> > > > to
> > > > standard yuv420 with Libyuv, need to force capture queue format
> > > > to
> > > > MM21 for Libyuv can't covert mediatek MT21 format at current
> > > > period.
> > > 
> > > Please rework this text, it is hard to understand.
> > > 
> > 
> > Will re-write the commit message in next version as below, could
> > you
> > please help to review whether it's well to be used ?
> > 
> > Libyuv is one software library used to covert format. Only covert
> > mediatek MM21 to standard yuv420 for MT21 is compressed mode and
> > MM21
> > is uncompressed mode at current period. Need to set capture queue
> > format to MM21 in order to use Libyuv.
> > 
> > > > 
> > > > Fixes: 7501edef6b1f ("media: mediatek: vcodec: Different codec
> > > > using different capture format")
> > > > Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.org>
> > > > ---
> > > > changed with v1:
> > > > - add Fixes tag.
> > > > ---
> > > >  drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c | 4
> > > > ++--
> > > >  1 file changed, 2 insertions(+), 2 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..4f5e9c20214f 100644
> > > > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
> > > > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec.c
> > > > @@ -41,7 +41,7 @@ static bool mtk_vdec_get_cap_fmt(struct
> > > > mtk_vcodec_ctx *ctx, int format_index)
> > > >  	const struct mtk_video_fmt *fmt;
> > > >  	struct mtk_q_data *q_data;
> > > >  	int num_frame_count = 0, i;
> > > > -	bool ret = true;
> > > > +	bool ret = false;
> 
> This change doesn't do anything, so I'd drop it.
> 
This change is useful when capture fourcc is MT21 will return false,
not support even if scp support mm21 and mt21.
> > > >  
> > > >  	for (i = 0; i < *dec_pdata->num_formats; i++) {
> > > >  		if (dec_pdata->vdec_formats[i].type !=
> > > > MTK_FMT_FRAME)
> > > > @@ -63,7 +63,7 @@ static bool mtk_vdec_get_cap_fmt(struct
> > > > mtk_vcodec_ctx *ctx, int format_index)
> > > >  	case V4L2_PIX_FMT_H264_SLICE:
> > > >  	case V4L2_PIX_FMT_VP9_FRAME:
> > > >  		if (fmt->fourcc == V4L2_PIX_FMT_MM21)
> > > > -			ret = false;
> > > > +			ret = true;
> > > 
> > > This makes the VP8 and the other cases identical, leaving
> > > anything
> > > that touches
> > > MT21 as dead code. I'm not sure, cause I cannot test it, but it
> > > should in theory
> > > render MT8192 unusable, unless a new firmware has been submitted
> > > to
> > > linux-
> > > firmware with MM21 support ?
> > > 
> > 
> > If the firmware only support MT21 => won't exist for vp8 need to
> > use
> > MM21.
> 
> And that's the issue, the scp.img for MT8192 on linux-firmware only
> supports
> MT21 [1]. Can you please update it to support both MM21 and MT21?
> 
> For MT8195, only MM21 is supported in scp.img [2], but since the
> hardware
> supports both MM21 and MT21, the firmware should also support both.
> So please
> also update it on linux-firmware.
> 
> [1] 
> https://lore.kernel.org/all/20230112204626.ciaff4amseoidybw@notapiano/
> [2] 
> https://lore.kernel.org/all/20230112205825.wb5qcqhh5kwvyi3y@notapiano/
> 
> Thanks,
> Nícolas
> 
MT8192 always use MM21 from the beginning, MT21 have not been enabled.

Best Regards,
Yunfei Dong
> > 
> > If the firmware only support MM21, will using MM21.
> > If the firmware support MT21 & MM21, will force VP8 to use MM21,
> > H264/VP9/AV1 will use MT21 before this change. 
> > 
> > Will force all driver to use MM21 after adding this change. 
> > 
> > Best Regards,
> > Yunfei Dong
> > > >  		break;
> > > >  	default:
> > > >  		ret = true;
> > > 
> > > 
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