linux-kernel - Re: [PATCH 3/3] media: vsp1: Reset FCP for VSPX

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Message-ID: <6orphbs6syqu6oruppyln4kkepj42c775cs4nj4oygu4xitpx6@tlvab6mntrrx>
Date: Thu, 12 Jun 2025 11:48:49 +0200
From: Jacopo Mondi <jacopo.mondi@...asonboard.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Jacopo Mondi <jacopo.mondi+renesas@...asonboard.com>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Kieran Bingham <kieran.bingham+renesas@...asonboard.com>, 
	Niklas Söderlund <niklas.soderlund@...natech.se>, linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] media: vsp1: Reset FCP for VSPX

Hi Laurent
On Thu, Jun 12, 2025 at 02:36:11AM +0300, Laurent Pinchart wrote:
> Hi Jacopo,
>
> Thank you for the patch.
>
> On Mon, Jun 09, 2025 at 09:01:44PM +0200, Jacopo Mondi wrote:
> > According section "62.3.7.1 "Operation Control Setting
>
> "According to"
>
> > IP set VSPX+FCPVX" of the R-Car Gen4 Hardware Manual, FCPX has to
> > be reset when stopping the image processing.
>
> That's only when stopping "image process of VSPX+FCPVX immediately".
> Note the "immediately", which involves resetting the VSP too. The code
> below waits for the pipeline to stop at the end of the frame. Resetting
> the FCP doesn't seem to be required in that case.
>

True, we certainly don't

2. Set value 1 to VSPX register VI6_SRESET.SRST0. VSPX will invoke
   termination process immediately.

but rather wait for the last frame to complete before stopping the
pipeline.

Do you think this patch should be dropped ?


> > Softawre reset the FCPX after the vsp1 pipe has stopped.
>
> s/Softawre/Software/
>
> > Signed-off-by: Jacopo Mondi <jacopo.mondi+renesas@...asonboard.com>
> > ---
> >  drivers/media/platform/renesas/vsp1/vsp1_pipe.c | 7 +++++--
> >  1 file changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/platform/renesas/vsp1/vsp1_pipe.c b/drivers/media/platform/renesas/vsp1/vsp1_pipe.c
> > index a6e5e10f3ef275c1b081c3d957e6cf356332afce..c6f2417aabc479384012ab8ab99556029ede1f44 100644
> > --- a/drivers/media/platform/renesas/vsp1/vsp1_pipe.c
> > +++ b/drivers/media/platform/renesas/vsp1/vsp1_pipe.c
> > @@ -499,6 +499,7 @@ bool vsp1_pipeline_stopped(struct vsp1_pipeline *pipe)
> >  int vsp1_pipeline_stop(struct vsp1_pipeline *pipe)
> >  {
> >  	struct vsp1_device *vsp1 = pipe->output->entity.vsp1;
> > +	u32 version = vsp1->version & VI6_IP_VERSION_MODEL_MASK;
> >  	struct vsp1_entity *entity;
> >  	unsigned long flags;
> >  	int ret;
> > @@ -515,8 +516,7 @@ int vsp1_pipeline_stop(struct vsp1_pipeline *pipe)
> >  			spin_unlock_irqrestore(&pipe->irqlock, flags);
> >  		}
> >
> > -		if ((vsp1->version & VI6_IP_VERSION_MODEL_MASK) ==
> > -		    VI6_IP_VERSION_MODEL_VSPD_GEN3)
> > +		if (version == VI6_IP_VERSION_MODEL_VSPD_GEN3)
> >  			ret |= rcar_fcp_soft_reset(vsp1->fcp);
> >
> >  	} else {
> > @@ -529,6 +529,9 @@ int vsp1_pipeline_stop(struct vsp1_pipeline *pipe)
> >  		ret = wait_event_timeout(pipe->wq, vsp1_pipeline_stopped(pipe),
> >  					 msecs_to_jiffies(500));
> >  		ret = ret == 0 ? -ETIMEDOUT : 0;
> > +
> > +		if (version == VI6_IP_VERSION_MODEL_VSPX_GEN4)
> > +			ret |= rcar_fcp_soft_reset(vsp1->fcp);
> >  	}
> >
> >  	list_for_each_entry(entity, &pipe->entities, list_pipe) {
>
> --
> Regards,
>
> Laurent Pinchart