From: Mauro Carvalho Chehab <mchehab@s-opensource.com>
To: Kieran Bingham <kieran.bingham@ideasonboard.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
dri-devel@lists.freedesktop.org, linux-media@vger.kernel.org,
linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH v2 02/14] v4l: vsp1: Don't recycle active list at display start
Date: Thu, 20 Jul 2017 10:51:38 -0300 [thread overview]
Message-ID: <20170720105138.395541e4@vento.lan> (raw)
In-Reply-To: <b020fe7c-78fe-0f40-88bd-58165b22c496@ideasonboard.com>
Em Thu, 13 Jul 2017 18:02:20 +0100
Kieran Bingham <kieran.bingham@ideasonboard.com> escreveu:
> Hi Laurent,
>
> On 26/06/17 19:12, Laurent Pinchart wrote:
> > When the display start interrupt occurs, we know that the hardware has
> > finished loading the active display list. The driver then proceeds to
> > recycle the list, assuming it won't be needed anymore.
> >
> > This assumption holds true for headerless display lists, as the VSP
> > doesn't reload the list for the next frame if it hasn't changed.
> > However, this isn't true anymore for header display lists, as they are
> > loaded at every frame start regardless of whether they have been
> > updated.
> >
> > To prepare for header display lists usage in display pipelines, we need
> > to postpone recycling the list until it gets replaced by a new one
> > through a page flip. The driver already does so in the frame end
> > interrupt handler, so all we need is to skip list recycling in the
> > display start interrupt handler.
> >
> > While the active list can be recycled at display start for headerless
> > display lists, there's no real harm in postponing that to the frame end
> > interrupt handler in all cases. This simplifies interrupt handling as we
> > don't need to process the display start interrupt anymore.
> >
> > Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
>
> Ok, I had skipped this one as I was concerned about its effects in relation to
> 11/14 but I see how that's working now.
>
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Thanks,
Mauro
next prev parent reply other threads:[~2017-07-20 13:51 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-26 18:12 [PATCH v2 00/14] Renesas R-Car VSP: Add H3 ES2.0 support Laurent Pinchart
2017-06-26 18:12 ` [PATCH v2 01/14] v4l: vsp1: Fill display list headers without holding dlm spinlock Laurent Pinchart
2017-07-13 12:48 ` Kieran Bingham
2017-07-20 13:50 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 02/14] v4l: vsp1: Don't recycle active list at display start Laurent Pinchart
2017-07-13 17:02 ` Kieran Bingham
2017-07-20 13:51 ` Mauro Carvalho Chehab [this message]
2017-06-26 18:12 ` [PATCH v2 03/14] v4l: vsp1: Don't set WPF sink pointer Laurent Pinchart
2017-07-13 12:50 ` Kieran Bingham
2017-07-20 13:52 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 04/14] v4l: vsp1: Store source and sink pointers as vsp1_entity Laurent Pinchart
2017-07-13 13:00 ` Kieran Bingham
2017-07-20 13:53 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 05/14] v4l: vsp1: Don't create links for DRM pipeline Laurent Pinchart
2017-07-13 13:06 ` Kieran Bingham
2017-07-20 13:54 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 06/14] v4l: vsp1: Add pipe index argument to the VSP-DU API Laurent Pinchart
2017-07-13 13:16 ` Kieran Bingham
2017-07-13 23:04 ` Laurent Pinchart
2017-07-20 13:56 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 07/14] v4l: vsp1: Add support for the BRS entity Laurent Pinchart
2017-07-13 13:38 ` Kieran Bingham
2017-07-20 13:58 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 08/14] v4l: vsp1: Add support for new VSP2-BS, VSP2-DL and VSP2-D instances Laurent Pinchart
2017-07-13 17:49 ` Kieran Bingham
2017-07-13 23:31 ` Laurent Pinchart
2017-07-14 7:36 ` Kieran Bingham
2017-07-14 0:35 ` [PATCH v2.1 " Laurent Pinchart
2017-07-20 13:59 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 09/14] v4l: vsp1: Add support for multiple LIF instances Laurent Pinchart
2017-07-13 17:57 ` Kieran Bingham
2017-07-20 14:00 ` Mauro Carvalho Chehab
2017-06-26 18:12 ` [PATCH v2 10/14] v4l: vsp1: Add support for multiple DRM pipelines Laurent Pinchart
2017-07-20 14:02 ` Mauro Carvalho Chehab
2017-08-01 18:39 ` Kieran Bingham
2017-06-26 18:12 ` [PATCH v2 11/14] v4l: vsp1: Add support for header display lists in continuous mode Laurent Pinchart
2017-07-20 14:03 ` Mauro Carvalho Chehab
2017-08-01 17:35 ` Kieran Bingham
2017-08-01 18:47 ` Laurent Pinchart
2017-08-02 11:06 ` Kieran Bingham
2017-06-26 18:12 ` [PATCH v2 12/14] drm: rcar-du: Support multiple sources from the same VSP Laurent Pinchart
2017-08-01 18:10 ` Kieran Bingham
2017-08-01 19:01 ` Laurent Pinchart
2017-06-26 18:12 ` [PATCH v2 13/14] drm: rcar-du: Restrict DPLL duty cycle workaround to H3 ES1.x Laurent Pinchart
2017-08-01 14:06 ` Kieran Bingham
2017-08-01 18:39 ` Laurent Pinchart
2017-12-11 20:58 ` Laurent Pinchart
2017-06-26 18:12 ` [PATCH v2 14/14] drm: rcar-du: Configure DPAD0 routing through last group on Gen3 Laurent Pinchart
2017-08-01 13:46 ` Kieran Bingham
2017-08-01 13:51 ` Laurent Pinchart
2017-08-01 17:20 ` [PATCH v2.1 " Laurent Pinchart
2017-08-01 17:23 ` Kieran Bingham
2017-07-13 12:25 ` [PATCH v2 00/14] Renesas R-Car VSP: Add H3 ES2.0 support Kieran Bingham
2017-07-14 0:54 ` Laurent Pinchart
2017-07-18 13:03 ` Hans Verkuil
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