On Thu, 2024-02-15 at 11:29 +0100, AngeloGioacchino Del Regno wrote:
> Il 15/02/24 01:49, Chun-Kuang Hu ha scritto:
> > Because client driver has the information of struct cmdq_client, so
> > it's not necessary to store struct cmdq_client in struct cmdq_pkt.
> > cmdq_pkt_finalize() use struct cmdq_client in struct cmdq_pkt, so
> > it's
> > going to be abandoned. Therefore, use cmdq_pkt_eoc() and
> > cmdq_pkt_nop()
> > to replace cmdq_pkt_finalize().
>
> No, it's not because cmdq_pkt_finalize() has cmdq_client, but because
> we want
> finer grain control over the CMDQ packets, as not all cases require
> the NOP
> packet to be appended after EOC.
>
> Besides, honestly I'm not even sure if the NOP is always required in
> MDP3, so...
>
> ...Moudy, you know the MDP3 way better than anyone else - can you
> please
> check if NOP is actually needed here?
>
> Thanks!
> Angelo
>
Hi Angelo,
After confirming with the hardware designer and performing the video
playback test, it was discovered that MDP3 is capable of excluding the
NOP(jump) instruction.
Sincerely,
Moudy
> >
> > Signed-off-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
> > ---
> > drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c | 3 ++-
> > drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c | 2 ++
> > drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h | 1 +
> > 3 files changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> > b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> > index 6adac857a477..a420d492d879 100644
> > --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> > +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-cmdq.c
> > @@ -471,7 +471,8 @@ int mdp_cmdq_send(struct mdp_dev *mdp, struct
> > mdp_cmdq_param *param)
> > dev_err(dev, "mdp_path_config error\n");
> > goto err_free_path;
> > }
> > - cmdq_pkt_finalize(&cmd->pkt);
> > + cmdq_pkt_eoc(&cmd->pkt);
> > + cmdq_pkt_nop(&cmd->pkt, mdp->cmdq_shift_pa);
> >
> > for (i = 0; i < num_comp; i++)
> > memcpy(&comps[i], path->comps[i].comp,
> > diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
> > b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
> > index 94f4ed78523b..2214744c937c 100644
> > --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
> > +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.c
> > @@ -231,6 +231,8 @@ static int mdp_probe(struct platform_device
> > *pdev)
> > goto err_put_scp;
> > }
> >
> > + mdp->cmdq_shift_pa = cmdq_get_shift_pa(mdp->cmdq_clt->chan);
> > +
> > init_waitqueue_head(&mdp->callback_wq);
> > ida_init(&mdp->mdp_ida);
> > platform_set_drvdata(pdev, mdp);
> > diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h
> > b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h
> > index 7e21d226ceb8..ed61e0bb69ee 100644
> > --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h
> > +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-core.h
> > @@ -83,6 +83,7 @@ struct mdp_dev {
> > u32 id_count;
> > struct ida mdp_ida;
> > struct cmdq_client *cmdq_clt;
> > + u8 cmdq_shift_pa;
> > wait_queue_head_t callback_wq;
> >
> > struct v4l2_device v4l2_dev;
>
>
