Hi Maxime Ripard,
> -----Original Message-----
> From: Maxime Ripard <mripard@xxxxxxxxxx>
> Sent: Friday, December 15, 2023 12:58 PM
> Subject: Re: [PATCH v15 3/5] drm: renesas: Add RZ/G2L DU Support
>
> On Fri, Dec 15, 2023 at 11:37:07AM +0000, Biju Das wrote:
> > Hi Maxime Ripard,
> >
> > > -----Original Message-----
> > > From: Maxime Ripard <mripard@xxxxxxxxxx>
> > > Sent: Friday, December 15, 2023 10:24 AM
> > > To: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > > Subject: Re: [PATCH v15 3/5] drm: renesas: Add RZ/G2L DU Support
> > >
> > > On Thu, Dec 14, 2023 at 03:24:17PM +0000, Biju Das wrote:
> > > > Hi Maxime Ripard,
> > > >
> > > > Thanks for the feedback.
> > > >
> > > > > -----Original Message-----
> > > > > From: Maxime Ripard <mripard@xxxxxxxxxx>
> > > > > Sent: Wednesday, December 13, 2023 3:47 PM
> > > > > To: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > > > > Subject: Re: [PATCH v15 3/5] drm: renesas: Add RZ/G2L DU Support
> > > > >
> > > > > > + */
> > > > > > + rzg2l_du_crtc_get(rcrtc);
> > > > >
> > > > > That's a bit suspicious. Have you looked at
> > > > > drm_atomic_helper_commit_tail_rpm() ?
> > > >
> > > > Ok, I will drop this and start using
> > > > drm_atomic_helper_commit_tail_rpm()
> > > > instead of rzg2l_du_atomic_commit_tail().
> > >
> > > It was more of a suggestion, really. I'm not sure whether it works
> > > for you, but it usually addresses similar issues in drivers.
> >
> > I confirm, it is working in my case, even after removing
> > rzg2l_du_crtc_get() and using the helper function
> drm_atomic_helper_commit_tail_rpm().
> >
> > >
> > > > >
> > > > > > +static int rzg2l_du_crtc_enable_vblank(struct drm_crtc *crtc) {
> > > > > > + struct rzg2l_du_crtc *rcrtc = to_rzg2l_crtc(crtc);
> > > > > > +
> > > > > > + rcrtc->vblank_enable = true;
> > > > > > +
> > > > > > + return 0;
> > > > > > +}
> > > > > > +
> > > > > > +static void rzg2l_du_crtc_disable_vblank(struct drm_crtc *crtc)
> {
> > > > > > + struct rzg2l_du_crtc *rcrtc = to_rzg2l_crtc(crtc);
> > > > > > +
> > > > > > + rcrtc->vblank_enable = false; }
> > > > >
> > > > > You should enable / disable your interrupts here
> > > >
> > > > We don't have dedicated vblank IRQ for enabling/disabling vblank.
> > > >
> > > > vblank is handled by vspd.
> > > >
> > > > vspd is directly rendering images to display,
> > > > rcar_du_crtc_finish_page_flip() and drm_crtc_handle_vblank()
> > > > called in vspd's pageflip context.
> > > >
> > > > See rzg2l_du_vsp_complete()in rzg2l_du_vsp.c
> > >
> > > Sorry, I couldn't really get how the interrupt flow / vblank
> > > reporting is going to work. Could you explain it a bit more?
> >
> > We just need to handle vertical blanking in the VSP frame end handler.
> > See the code below.
> >
> > static void rzg2l_du_vsp_complete(void *private, unsigned int status,
> > u32 crc) {
> > struct rzg2l_du_crtc *crtc = private;
> >
> > if (crtc->vblank_enable)
> > drm_crtc_handle_vblank(&crtc->crtc);
> >
> > if (status & VSP1_DU_STATUS_COMPLETE)
> > rzg2l_du_crtc_finish_page_flip(crtc);
> >
> > drm_crtc_add_crc_entry(&crtc->crtc, false, 0, &crc); }
>
> Then we're back to the same question :)
>
> Why can't you mask the frame end interrupt?
We are masking interrupts.
[ 70.639139] #######rzg2l_du_crtc_disable_vblank#######
[ 70.650243] #########rzg2l_du_vsp_disable ############
[ 70.652003] ########## vsp1_wpf_stop###
Unmask is,
[ 176.354520] #######rzg2l_du_crtc_enable_vblank#######
[ 176.354922] #########rzg2l_du_vsp_atomic_flush ############
[ 176.355198] ########## wpf_configure_stream###
Cheers,
Biju
