Hi Biju,
On Thu, Jan 04, 2024 at 02:17:39PM +0000, Biju Das wrote:
> On Friday, December 15, 2023 2:56 PM, Biju Das wrote:
> > On Friday, December 15, 2023 2:18 PM, Maxime Ripard wrote:
> > > On Fri, Dec 15, 2023 at 01:52:28PM +0000, Biju Das wrote:
> > > > > > > > > > +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###
> > >
> > > Sorry, my question was why aren't you unmasking and masking them in
> > > the enable/disable_vblank hooks of the CRTC.
> >
> > I have n't tried that. Will try and provide feedback.
> >
> > Currently the IRQ source belongs to VSPD in media subsystem.
> > So I need to export an API though vsp1_drm and test it.
>
> + linux-media
>
> Laurent, are you ok with the below RZ/G2L specific patch[1] for
> enabling/disabling frame end interrupt in VSP driver?
> Note:
> I need to add a quirk for handling this only for RZ/G2L family as
> other SoCs have Vblank specific interrupt available in DU.
The DU driver on Gen3 handles vblank exactly as in your patch. What's
the problem with that ?
> [1]
>
> diff --git a/drivers/media/platform/renesas/vsp1/vsp1_drm.c b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
> index 9b087bd8df7d..39347c16bb27 100644
> --- a/drivers/media/platform/renesas/vsp1/vsp1_drm.c
> +++ b/drivers/media/platform/renesas/vsp1/vsp1_drm.c
> @@ -936,6 +936,14 @@ void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt)
> }
> EXPORT_SYMBOL_GPL(vsp1_du_unmap_sg);
>
> +void vsp1_du_mask_frame_end_interrupt(struct device *dev, bool mask)
> +{
> + struct vsp1_device *vsp1 = dev_get_drvdata(dev);
> +
> + vsp1_write(vsp1, VI6_WPF_IRQ_ENB(0), mask ? 0 : VI6_WPF_IRQ_ENB_DFEE);
That will break everything. As soon as you turn of vblank reporting, the
VSP will stop processing frames and the display will freeze.
> +}
> +EXPORT_SYMBOL_GPL(vsp1_du_mask_frame_end_interrupt);
> +
> /* -----------------------------------------------------------------------------
> * Initialization
> */
> diff --git a/include/media/vsp1.h b/include/media/vsp1.h
> index 48f4a5023d81..ccac48a6bdd2 100644
> --- a/include/media/vsp1.h
> +++ b/include/media/vsp1.h
> @@ -117,4 +117,6 @@ void vsp1_du_atomic_flush(struct device *dev, unsigned int pipe_index,
> int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt);
> void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt);
>
> +void vsp1_du_mask_frame_end_interrupt(struct device *dev, bool mask);
> +
> #endif /* __MEDIA_VSP1_H__ */
--
Regards,
Laurent Pinchart
