From: Daniel Vetter <daniel.vetter-/w4YWyX8dFk@public.gmane.org>
To: Laurent Pinchart
<laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
Cc: DRI Development
<dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
Intel Graphics Development
<intel-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
Boris Brezillon
<boris.brezillon-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>,
Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>,
Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
Tetsuo Handa
<penguin-kernel-1yMVhJb1mP/7nzcFbJAaVXf5DAMn2ifp@public.gmane.org>,
syzbot+0871b14ca2e2fb64f6e3-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org,
"James (Qian) Wang"
<james.qian.wang-5wv7dgnIgG8@public.gmane.org>,
Mihail Atanassov <mihail.atanassov-5wv7dgnIgG8@public.gmane.org>,
Brian Starkey <brian.starkey-5wv7dgnIgG8@public.gmane.org>,
Sam Ravnborg <sam-uyr5N9Q2VtJg9hUCZPvPmw@public.gmane.org>,
Boris Brezillon
<bbrezillon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Nicolas Ferre
<nicolas.ferre-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>,
Alexandre Belloni
<alexandre.belloni-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>,
Ludovic Desroches
<ludovic.desroches-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>,
Maarten Lankhorst
<maarten.lankhorst-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Maxime Ripard <mrip>
Subject: Re: [PATCH 1/3] drm/atomic-helper: reset vblank on crtc reset
Date: Wed, 3 Jun 2020 09:55:12 +0200 [thread overview]
Message-ID: <CAKMK7uEm7bfSpbYXH7SXLR4_+qAjf9OgmW7eqxGAmB0wMTefpg@mail.gmail.com> (raw)
In-Reply-To: <20200603001900.GV6547-N3hz7ZxfLydczECFQUw77jytWr6r+dGw0E9HWUfgJXw@public.gmane.org>
On Wed, Jun 3, 2020 at 2:19 AM Laurent Pinchart
<laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org> wrote:
>
> Hi Daniel,
>
> Thank you for the patch.
>
> May I remind you about the -v option to git-format-patch ? :-) Seriously
> speaking, it really helps review.
>
> On Tue, Jun 02, 2020 at 11:51:38AM +0200, Daniel Vetter wrote:
> > Only when vblanks are supported ofc.
> >
> > Some drivers do this already, but most unfortunately missed it. This
> > opens up bugs after driver load, before the crtc is enabled for the
> > first time. syzbot spotted this when loading vkms as a secondary
> > output. Given how many drivers are buggy it's best to solve this once
> > and for all in shared helper code.
> >
> > Aside from moving the few existing calls to drm_crtc_vblank_reset into
> > helpers (i915 doesn't use helpers, so keeps its own) I think the
> > regression risk is minimal: atomic helpers already rely on drivers
> > calling drm_crtc_vblank_on/off correctly in their hooks when they
> > support vblanks. And driver that's failing to handle vblanks after
> > this is missing those calls already, and vblanks could only work by
> > accident when enabling a CRTC for the first time right after boot.
> >
> > Big thanks to Tetsuo for helping track down what's going wrong here.
> >
> > There's only a few drivers which already had the necessary call and
> > needed some updating:
> > - komeda, atmel and tidss also needed to be changed to call
> > __drm_atomic_helper_crtc_reset() intead of open coding it
> > - tegra and msm even had it in the same place already, just code
> > motion, and malidp already uses __drm_atomic_helper_crtc_reset().
> >
> > Only call left is in i915, which doesn't use drm_mode_config_reset,
> > but has its own fastboot infrastructure. So that's the only case where
> > we actually want this in the driver still.
> >
> > I've also reviewed all other drivers which set up vblank support with
> > drm_vblank_init. After the previous patch fixing mxsfb all atomic
> > drivers do call drm_crtc_vblank_on/off as they should, the remaining
> > drivers are either legacy kms or legacy dri1 drivers, so not affected
> > by this change to atomic helpers.
> >
> > v2: Use the drm_dev_has_vblank() helper.
> >
> > v3: Laurent pointed out that omap and rcar-du used drm_crtc_vblank_off
> > instead of drm_crtc_vblank_reset. Adjust them too.
> >
> > Cc: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
> > Reviewed-by: Boris Brezillon <boris.brezillon-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
> > Acked-by: Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>
> > Acked-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> > Link: https://syzkaller.appspot.com/bug?id=0ba17d70d062b2595e1f061231474800f076c7cb
> > Reported-by: Tetsuo Handa <penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
> > Reported-by: syzbot+0871b14ca2e2fb64f6e3-Pl5Pbv+GP7P466ipTTIvnc23WoclnBCfAL8bYrjMMd8@public.gmane.org
> > Cc: Tetsuo Handa <penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
> > Cc: "James (Qian) Wang" <james.qian.wang-5wv7dgnIgG8@public.gmane.org>
> > Cc: Liviu Dudau <liviu.dudau-5wv7dgnIgG8@public.gmane.org>
> > Cc: Mihail Atanassov <mihail.atanassov-5wv7dgnIgG8@public.gmane.org>
> > Cc: Brian Starkey <brian.starkey-5wv7dgnIgG8@public.gmane.org>
> > Cc: Sam Ravnborg <sam-uyr5N9Q2VtJg9hUCZPvPmw@public.gmane.org>
> > Cc: Boris Brezillon <bbrezillon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> > Cc: Nicolas Ferre <nicolas.ferre-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
> > Cc: Alexandre Belloni <alexandre.belloni-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org>
> > Cc: Ludovic Desroches <ludovic.desroches-UWL1GkI3JZL3oGB3hsPCZA@public.gmane.org>
> > Cc: Maarten Lankhorst <maarten.lankhorst-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
> > Cc: Maxime Ripard <mripard-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> > Cc: Thomas Zimmermann <tzimmermann-l3A5Bk7waGM@public.gmane.org>
> > Cc: David Airlie <airlied-cv59FeDIM0c@public.gmane.org>
> > Cc: Daniel Vetter <daniel-/w4YWyX8dFk@public.gmane.org>
> > Cc: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > Cc: Jonathan Hunter <jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> > Cc: Jyri Sarha <jsarha-l0cyMroinI0@public.gmane.org>
> > Cc: Tomi Valkeinen <tomi.valkeinen-l0cyMroinI0@public.gmane.org>
> > Cc: Rob Clark <robdclark-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > Cc: Sean Paul <seanpaul-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> > Cc: Brian Masney <masneyb-1iNe0GrtECGEi8DpZVb4nw@public.gmane.org>
> > Cc: Emil Velikov <emil.velikov-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>
> > Cc: zhengbin <zhengbin13-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
> > Cc: Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
> > Cc: linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > Signed-off-by: Daniel Vetter <daniel.vetter-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> > ---
> > drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 7 ++-----
> > drivers/gpu/drm/arm/malidp_drv.c | 1 -
> > drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 7 ++-----
> > drivers/gpu/drm/drm_atomic_state_helper.c | 4 ++++
> > drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 2 --
> > drivers/gpu/drm/omapdrm/omap_drv.c | 3 ---
> > drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 3 ---
> > drivers/gpu/drm/tegra/dc.c | 1 -
> > drivers/gpu/drm/tidss/tidss_crtc.c | 3 +--
> > drivers/gpu/drm/tidss/tidss_kms.c | 4 ----
> > 10 files changed, 9 insertions(+), 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > index 56bd938961ee..f33418d6e1a0 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > @@ -492,10 +492,8 @@ static void komeda_crtc_reset(struct drm_crtc *crtc)
> > crtc->state = NULL;
> >
> > state = kzalloc(sizeof(*state), GFP_KERNEL);
> > - if (state) {
> > - crtc->state = &state->base;
> > - crtc->state->crtc = crtc;
> > - }
> > + if (state)
> > + __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > }
> >
> > static struct drm_crtc_state *
> > @@ -616,7 +614,6 @@ static int komeda_crtc_add(struct komeda_kms_dev *kms,
> > return err;
> >
> > drm_crtc_helper_add(crtc, &komeda_crtc_helper_funcs);
> > - drm_crtc_vblank_reset(crtc);
> >
> > crtc->port = kcrtc->master->of_output_port;
> >
> > diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> > index c2507b7d8512..02904392e370 100644
> > --- a/drivers/gpu/drm/arm/malidp_drv.c
> > +++ b/drivers/gpu/drm/arm/malidp_drv.c
> > @@ -870,7 +870,6 @@ static int malidp_bind(struct device *dev)
> > drm->irq_enabled = true;
> >
> > ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
> > - drm_crtc_vblank_reset(&malidp->crtc);
> > if (ret < 0) {
> > DRM_ERROR("failed to initialise vblank\n");
> > goto vblank_fail;
> > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > index 10985134ce0b..ce246b96330b 100644
> > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > @@ -411,10 +411,8 @@ static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
> > }
> >
> > state = kzalloc(sizeof(*state), GFP_KERNEL);
> > - if (state) {
> > - crtc->state = &state->base;
> > - crtc->state->crtc = crtc;
> > - }
> > + if (state)
> > + __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > }
> >
> > static struct drm_crtc_state *
> > @@ -528,7 +526,6 @@ int atmel_hlcdc_crtc_create(struct drm_device *dev)
> > }
> >
> > drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
> > - drm_crtc_vblank_reset(&crtc->base);
> >
> > drm_mode_crtc_set_gamma_size(&crtc->base, ATMEL_HLCDC_CLUT_SIZE);
> > drm_crtc_enable_color_mgmt(&crtc->base, 0, false,
> > diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> > index 8fce6a115dfe..9ad74045158e 100644
> > --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> > +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> > @@ -32,6 +32,7 @@
> > #include <drm/drm_device.h>
> > #include <drm/drm_plane.h>
> > #include <drm/drm_print.h>
> > +#include <drm/drm_vblank.h>
> > #include <drm/drm_writeback.h>
> >
> > #include <linux/slab.h>
> > @@ -93,6 +94,9 @@ __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
> > if (crtc_state)
> > __drm_atomic_helper_crtc_state_reset(crtc_state, crtc);
> >
> > + if (drm_dev_has_vblank(crtc->dev))
> > + drm_crtc_vblank_reset(crtc);
> > +
> > crtc->state = crtc_state;
> > }
> > EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset);
> > diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > index ca3368c828d0..9606185c284b 100644
> > --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > @@ -1117,8 +1117,6 @@ static void mdp5_crtc_reset(struct drm_crtc *crtc)
> > mdp5_crtc_destroy_state(crtc, crtc->state);
> >
> > __drm_atomic_helper_crtc_reset(crtc, &mdp5_cstate->base);
> > -
> > - drm_crtc_vblank_reset(crtc);
> > }
> >
> > static const struct drm_crtc_funcs mdp5_crtc_funcs = {
> > diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
> > index 242d28281784..7a7066cded79 100644
> > --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> > +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> > @@ -642,9 +642,6 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
> > goto err_cleanup_modeset;
> > }
> >
> > - for (i = 0; i < priv->num_pipes; i++)
> > - drm_crtc_vblank_off(priv->pipes[i].crtc);
> > -
> > omap_fbdev_init(ddev);
> >
> > drm_kms_helper_poll_init(ddev);
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > index d73e88ddecd0..e2959e32fd19 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > @@ -1271,9 +1271,6 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex,
> >
> > drm_crtc_helper_add(crtc, &crtc_helper_funcs);
> >
> > - /* Start with vertical blanking interrupt reporting disabled. */
> > - drm_crtc_vblank_off(crtc);
> > -
>
> I'm sure I've added this code for a good reason, I would have sworn that
> vblank would be either broken or would complain very loudly without this
> call. I've however tested this patch, and haven't noticed any
> regression. Has something changed since I've added the call to
> drm_crtc_vblank_off() in the rcar-du driver ? It can't be
> __drm_atomic_helper_crtc_reset() handling it, as the rcar-du driver has
> a custom CRTC reset handler that doesn't call
> __drm_atomic_helper_crtc_reset(). If it works without calling
> drm_crtc_vblank_off() or drm_crtc_vblank_reset(), what's the purpose of
> drm_crtc_vblank_reset() ?
>
> /me is very puzzled
Uh yeah this breaks stuff, I forgot to review the two drivers I've
changed to make sure they're using the __drm_atomic_helper_crtc_reset
function. Like they should. I'll respin.
-Daniel
> > /* Register the interrupt handler. */
> > if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
> > /* The IRQ's are associated with the CRTC (sw)index. */
> > diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> > index 83f31c6e891c..9b308b572eac 100644
> > --- a/drivers/gpu/drm/tegra/dc.c
> > +++ b/drivers/gpu/drm/tegra/dc.c
> > @@ -1168,7 +1168,6 @@ static void tegra_crtc_reset(struct drm_crtc *crtc)
> > tegra_crtc_atomic_destroy_state(crtc, crtc->state);
> >
> > __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > - drm_crtc_vblank_reset(crtc);
> > }
> >
> > static struct drm_crtc_state *
> > diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c
> > index 89a226912de8..4d01c4af61cd 100644
> > --- a/drivers/gpu/drm/tidss/tidss_crtc.c
> > +++ b/drivers/gpu/drm/tidss/tidss_crtc.c
> > @@ -352,8 +352,7 @@ static void tidss_crtc_reset(struct drm_crtc *crtc)
> > return;
> > }
> >
> > - crtc->state = &tcrtc->base;
> > - crtc->state->crtc = crtc;
> > + __drm_atomic_helper_crtc_reset(crtc, &tcrtc->base);
> > }
> >
> > static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
> > diff --git a/drivers/gpu/drm/tidss/tidss_kms.c b/drivers/gpu/drm/tidss/tidss_kms.c
> > index 4b99e9fa84a5..e6ab59eed259 100644
> > --- a/drivers/gpu/drm/tidss/tidss_kms.c
> > +++ b/drivers/gpu/drm/tidss/tidss_kms.c
> > @@ -278,10 +278,6 @@ int tidss_modeset_init(struct tidss_device *tidss)
> > if (ret)
> > return ret;
> >
> > - /* Start with vertical blanking interrupt reporting disabled. */
> > - for (i = 0; i < tidss->num_crtcs; ++i)
> > - drm_crtc_vblank_reset(tidss->crtcs[i]);
> > -
> > drm_mode_config_reset(ddev);
> >
> > dev_dbg(tidss->dev, "%s done\n", __func__);
>
> --
> Regards,
>
> Laurent Pinchart
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Liviu Dudau <liviu.dudau@arm.com>,
DRI Development <dri-devel@lists.freedesktop.org>,
Thierry Reding <thierry.reding@gmail.com>,
Daniel Vetter <daniel.vetter@intel.com>,
Mihail Atanassov <mihail.atanassov@arm.com>,
Sam Ravnborg <sam@ravnborg.org>,
Emil Velikov <emil.velikov@collabora.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
David Airlie <airlied@linux.ie>,
Ludovic Desroches <ludovic.desroches@microchip.com>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
"James \(Qian\) Wang" <james.qian.wang@arm.com>,
Thierry Reding <treding@nvidia.com>,
syzbot+0871b14ca2e2fb64f6e3@syzkaller.appspotmail.com,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
Jyri Sarha <jsarha@ti.com>, Sean Paul <seanpaul@chromium.org>,
linux-tegra <linux-tegra@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Boris Brezillon <bbrezillon@kernel.org>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
zhengbin <zhengbin13@huawei.com>,
Boris Brezillon <boris.brezillon@collabora.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Brian Masney <masneyb@onstation.org>
Subject: Re: [PATCH 1/3] drm/atomic-helper: reset vblank on crtc reset
Date: Wed, 3 Jun 2020 09:55:12 +0200 [thread overview]
Message-ID: <CAKMK7uEm7bfSpbYXH7SXLR4_+qAjf9OgmW7eqxGAmB0wMTefpg@mail.gmail.com> (raw)
In-Reply-To: <20200603001900.GV6547@pendragon.ideasonboard.com>
On Wed, Jun 3, 2020 at 2:19 AM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Daniel,
>
> Thank you for the patch.
>
> May I remind you about the -v option to git-format-patch ? :-) Seriously
> speaking, it really helps review.
>
> On Tue, Jun 02, 2020 at 11:51:38AM +0200, Daniel Vetter wrote:
> > Only when vblanks are supported ofc.
> >
> > Some drivers do this already, but most unfortunately missed it. This
> > opens up bugs after driver load, before the crtc is enabled for the
> > first time. syzbot spotted this when loading vkms as a secondary
> > output. Given how many drivers are buggy it's best to solve this once
> > and for all in shared helper code.
> >
> > Aside from moving the few existing calls to drm_crtc_vblank_reset into
> > helpers (i915 doesn't use helpers, so keeps its own) I think the
> > regression risk is minimal: atomic helpers already rely on drivers
> > calling drm_crtc_vblank_on/off correctly in their hooks when they
> > support vblanks. And driver that's failing to handle vblanks after
> > this is missing those calls already, and vblanks could only work by
> > accident when enabling a CRTC for the first time right after boot.
> >
> > Big thanks to Tetsuo for helping track down what's going wrong here.
> >
> > There's only a few drivers which already had the necessary call and
> > needed some updating:
> > - komeda, atmel and tidss also needed to be changed to call
> > __drm_atomic_helper_crtc_reset() intead of open coding it
> > - tegra and msm even had it in the same place already, just code
> > motion, and malidp already uses __drm_atomic_helper_crtc_reset().
> >
> > Only call left is in i915, which doesn't use drm_mode_config_reset,
> > but has its own fastboot infrastructure. So that's the only case where
> > we actually want this in the driver still.
> >
> > I've also reviewed all other drivers which set up vblank support with
> > drm_vblank_init. After the previous patch fixing mxsfb all atomic
> > drivers do call drm_crtc_vblank_on/off as they should, the remaining
> > drivers are either legacy kms or legacy dri1 drivers, so not affected
> > by this change to atomic helpers.
> >
> > v2: Use the drm_dev_has_vblank() helper.
> >
> > v3: Laurent pointed out that omap and rcar-du used drm_crtc_vblank_off
> > instead of drm_crtc_vblank_reset. Adjust them too.
> >
> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
> > Acked-by: Liviu Dudau <liviu.dudau@arm.com>
> > Acked-by: Thierry Reding <treding@nvidia.com>
> > Link: https://syzkaller.appspot.com/bug?id=0ba17d70d062b2595e1f061231474800f076c7cb
> > Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> > Reported-by: syzbot+0871b14ca2e2fb64f6e3@syzkaller.appspotmail.com
> > Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> > Cc: "James (Qian) Wang" <james.qian.wang@arm.com>
> > Cc: Liviu Dudau <liviu.dudau@arm.com>
> > Cc: Mihail Atanassov <mihail.atanassov@arm.com>
> > Cc: Brian Starkey <brian.starkey@arm.com>
> > Cc: Sam Ravnborg <sam@ravnborg.org>
> > Cc: Boris Brezillon <bbrezillon@kernel.org>
> > Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
> > Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> > Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
> > Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > Cc: Maxime Ripard <mripard@kernel.org>
> > Cc: Thomas Zimmermann <tzimmermann@suse.de>
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: Jonathan Hunter <jonathanh@nvidia.com>
> > Cc: Jyri Sarha <jsarha@ti.com>
> > Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> > Cc: Rob Clark <robdclark@gmail.com>
> > Cc: Sean Paul <seanpaul@chromium.org>
> > Cc: Brian Masney <masneyb@onstation.org>
> > Cc: Emil Velikov <emil.velikov@collabora.com>
> > Cc: zhengbin <zhengbin13@huawei.com>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: linux-tegra@vger.kernel.org
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > ---
> > drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 7 ++-----
> > drivers/gpu/drm/arm/malidp_drv.c | 1 -
> > drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 7 ++-----
> > drivers/gpu/drm/drm_atomic_state_helper.c | 4 ++++
> > drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 2 --
> > drivers/gpu/drm/omapdrm/omap_drv.c | 3 ---
> > drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 3 ---
> > drivers/gpu/drm/tegra/dc.c | 1 -
> > drivers/gpu/drm/tidss/tidss_crtc.c | 3 +--
> > drivers/gpu/drm/tidss/tidss_kms.c | 4 ----
> > 10 files changed, 9 insertions(+), 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > index 56bd938961ee..f33418d6e1a0 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > @@ -492,10 +492,8 @@ static void komeda_crtc_reset(struct drm_crtc *crtc)
> > crtc->state = NULL;
> >
> > state = kzalloc(sizeof(*state), GFP_KERNEL);
> > - if (state) {
> > - crtc->state = &state->base;
> > - crtc->state->crtc = crtc;
> > - }
> > + if (state)
> > + __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > }
> >
> > static struct drm_crtc_state *
> > @@ -616,7 +614,6 @@ static int komeda_crtc_add(struct komeda_kms_dev *kms,
> > return err;
> >
> > drm_crtc_helper_add(crtc, &komeda_crtc_helper_funcs);
> > - drm_crtc_vblank_reset(crtc);
> >
> > crtc->port = kcrtc->master->of_output_port;
> >
> > diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> > index c2507b7d8512..02904392e370 100644
> > --- a/drivers/gpu/drm/arm/malidp_drv.c
> > +++ b/drivers/gpu/drm/arm/malidp_drv.c
> > @@ -870,7 +870,6 @@ static int malidp_bind(struct device *dev)
> > drm->irq_enabled = true;
> >
> > ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
> > - drm_crtc_vblank_reset(&malidp->crtc);
> > if (ret < 0) {
> > DRM_ERROR("failed to initialise vblank\n");
> > goto vblank_fail;
> > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > index 10985134ce0b..ce246b96330b 100644
> > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > @@ -411,10 +411,8 @@ static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
> > }
> >
> > state = kzalloc(sizeof(*state), GFP_KERNEL);
> > - if (state) {
> > - crtc->state = &state->base;
> > - crtc->state->crtc = crtc;
> > - }
> > + if (state)
> > + __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > }
> >
> > static struct drm_crtc_state *
> > @@ -528,7 +526,6 @@ int atmel_hlcdc_crtc_create(struct drm_device *dev)
> > }
> >
> > drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
> > - drm_crtc_vblank_reset(&crtc->base);
> >
> > drm_mode_crtc_set_gamma_size(&crtc->base, ATMEL_HLCDC_CLUT_SIZE);
> > drm_crtc_enable_color_mgmt(&crtc->base, 0, false,
> > diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> > index 8fce6a115dfe..9ad74045158e 100644
> > --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> > +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> > @@ -32,6 +32,7 @@
> > #include <drm/drm_device.h>
> > #include <drm/drm_plane.h>
> > #include <drm/drm_print.h>
> > +#include <drm/drm_vblank.h>
> > #include <drm/drm_writeback.h>
> >
> > #include <linux/slab.h>
> > @@ -93,6 +94,9 @@ __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
> > if (crtc_state)
> > __drm_atomic_helper_crtc_state_reset(crtc_state, crtc);
> >
> > + if (drm_dev_has_vblank(crtc->dev))
> > + drm_crtc_vblank_reset(crtc);
> > +
> > crtc->state = crtc_state;
> > }
> > EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset);
> > diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > index ca3368c828d0..9606185c284b 100644
> > --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > @@ -1117,8 +1117,6 @@ static void mdp5_crtc_reset(struct drm_crtc *crtc)
> > mdp5_crtc_destroy_state(crtc, crtc->state);
> >
> > __drm_atomic_helper_crtc_reset(crtc, &mdp5_cstate->base);
> > -
> > - drm_crtc_vblank_reset(crtc);
> > }
> >
> > static const struct drm_crtc_funcs mdp5_crtc_funcs = {
> > diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
> > index 242d28281784..7a7066cded79 100644
> > --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> > +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> > @@ -642,9 +642,6 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
> > goto err_cleanup_modeset;
> > }
> >
> > - for (i = 0; i < priv->num_pipes; i++)
> > - drm_crtc_vblank_off(priv->pipes[i].crtc);
> > -
> > omap_fbdev_init(ddev);
> >
> > drm_kms_helper_poll_init(ddev);
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > index d73e88ddecd0..e2959e32fd19 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > @@ -1271,9 +1271,6 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex,
> >
> > drm_crtc_helper_add(crtc, &crtc_helper_funcs);
> >
> > - /* Start with vertical blanking interrupt reporting disabled. */
> > - drm_crtc_vblank_off(crtc);
> > -
>
> I'm sure I've added this code for a good reason, I would have sworn that
> vblank would be either broken or would complain very loudly without this
> call. I've however tested this patch, and haven't noticed any
> regression. Has something changed since I've added the call to
> drm_crtc_vblank_off() in the rcar-du driver ? It can't be
> __drm_atomic_helper_crtc_reset() handling it, as the rcar-du driver has
> a custom CRTC reset handler that doesn't call
> __drm_atomic_helper_crtc_reset(). If it works without calling
> drm_crtc_vblank_off() or drm_crtc_vblank_reset(), what's the purpose of
> drm_crtc_vblank_reset() ?
>
> /me is very puzzled
Uh yeah this breaks stuff, I forgot to review the two drivers I've
changed to make sure they're using the __drm_atomic_helper_crtc_reset
function. Like they should. I'll respin.
-Daniel
> > /* Register the interrupt handler. */
> > if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
> > /* The IRQ's are associated with the CRTC (sw)index. */
> > diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> > index 83f31c6e891c..9b308b572eac 100644
> > --- a/drivers/gpu/drm/tegra/dc.c
> > +++ b/drivers/gpu/drm/tegra/dc.c
> > @@ -1168,7 +1168,6 @@ static void tegra_crtc_reset(struct drm_crtc *crtc)
> > tegra_crtc_atomic_destroy_state(crtc, crtc->state);
> >
> > __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > - drm_crtc_vblank_reset(crtc);
> > }
> >
> > static struct drm_crtc_state *
> > diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c
> > index 89a226912de8..4d01c4af61cd 100644
> > --- a/drivers/gpu/drm/tidss/tidss_crtc.c
> > +++ b/drivers/gpu/drm/tidss/tidss_crtc.c
> > @@ -352,8 +352,7 @@ static void tidss_crtc_reset(struct drm_crtc *crtc)
> > return;
> > }
> >
> > - crtc->state = &tcrtc->base;
> > - crtc->state->crtc = crtc;
> > + __drm_atomic_helper_crtc_reset(crtc, &tcrtc->base);
> > }
> >
> > static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
> > diff --git a/drivers/gpu/drm/tidss/tidss_kms.c b/drivers/gpu/drm/tidss/tidss_kms.c
> > index 4b99e9fa84a5..e6ab59eed259 100644
> > --- a/drivers/gpu/drm/tidss/tidss_kms.c
> > +++ b/drivers/gpu/drm/tidss/tidss_kms.c
> > @@ -278,10 +278,6 @@ int tidss_modeset_init(struct tidss_device *tidss)
> > if (ret)
> > return ret;
> >
> > - /* Start with vertical blanking interrupt reporting disabled. */
> > - for (i = 0; i < tidss->num_crtcs; ++i)
> > - drm_crtc_vblank_reset(tidss->crtcs[i]);
> > -
> > drm_mode_config_reset(ddev);
> >
> > dev_dbg(tidss->dev, "%s done\n", __func__);
>
> --
> Regards,
>
> Laurent Pinchart
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
_______________________________________________
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WARNING: multiple messages have this Message-ID (diff)
From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
DRI Development <dri-devel@lists.freedesktop.org>,
Daniel Vetter <daniel.vetter@intel.com>,
Mihail Atanassov <mihail.atanassov@arm.com>,
Sam Ravnborg <sam@ravnborg.org>,
Emil Velikov <emil.velikov@collabora.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
David Airlie <airlied@linux.ie>,
Ludovic Desroches <ludovic.desroches@microchip.com>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
"James \(Qian\) Wang" <james.qian.wang@arm.com>,
Thierry Reding <treding@nvidia.com>,
syzbot+0871b14ca2e2fb64f6e3@syzkaller.appspotmail.com,
Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
Jyri Sarha <jsarha@ti.com>, Sean Paul <seanpaul@chromium.org>,
Maxime Ripard <mripard@kernel.org>,
linux-tegra <linux-tegra@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Boris Brezillon <bbrezillon@kernel.org>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
zhengbin <zhengbin13@huawei.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
Brian Masney <masneyb@onstation.org>
Subject: Re: [Intel-gfx] [PATCH 1/3] drm/atomic-helper: reset vblank on crtc reset
Date: Wed, 3 Jun 2020 09:55:12 +0200 [thread overview]
Message-ID: <CAKMK7uEm7bfSpbYXH7SXLR4_+qAjf9OgmW7eqxGAmB0wMTefpg@mail.gmail.com> (raw)
In-Reply-To: <20200603001900.GV6547@pendragon.ideasonboard.com>
On Wed, Jun 3, 2020 at 2:19 AM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Daniel,
>
> Thank you for the patch.
>
> May I remind you about the -v option to git-format-patch ? :-) Seriously
> speaking, it really helps review.
>
> On Tue, Jun 02, 2020 at 11:51:38AM +0200, Daniel Vetter wrote:
> > Only when vblanks are supported ofc.
> >
> > Some drivers do this already, but most unfortunately missed it. This
> > opens up bugs after driver load, before the crtc is enabled for the
> > first time. syzbot spotted this when loading vkms as a secondary
> > output. Given how many drivers are buggy it's best to solve this once
> > and for all in shared helper code.
> >
> > Aside from moving the few existing calls to drm_crtc_vblank_reset into
> > helpers (i915 doesn't use helpers, so keeps its own) I think the
> > regression risk is minimal: atomic helpers already rely on drivers
> > calling drm_crtc_vblank_on/off correctly in their hooks when they
> > support vblanks. And driver that's failing to handle vblanks after
> > this is missing those calls already, and vblanks could only work by
> > accident when enabling a CRTC for the first time right after boot.
> >
> > Big thanks to Tetsuo for helping track down what's going wrong here.
> >
> > There's only a few drivers which already had the necessary call and
> > needed some updating:
> > - komeda, atmel and tidss also needed to be changed to call
> > __drm_atomic_helper_crtc_reset() intead of open coding it
> > - tegra and msm even had it in the same place already, just code
> > motion, and malidp already uses __drm_atomic_helper_crtc_reset().
> >
> > Only call left is in i915, which doesn't use drm_mode_config_reset,
> > but has its own fastboot infrastructure. So that's the only case where
> > we actually want this in the driver still.
> >
> > I've also reviewed all other drivers which set up vblank support with
> > drm_vblank_init. After the previous patch fixing mxsfb all atomic
> > drivers do call drm_crtc_vblank_on/off as they should, the remaining
> > drivers are either legacy kms or legacy dri1 drivers, so not affected
> > by this change to atomic helpers.
> >
> > v2: Use the drm_dev_has_vblank() helper.
> >
> > v3: Laurent pointed out that omap and rcar-du used drm_crtc_vblank_off
> > instead of drm_crtc_vblank_reset. Adjust them too.
> >
> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
> > Acked-by: Liviu Dudau <liviu.dudau@arm.com>
> > Acked-by: Thierry Reding <treding@nvidia.com>
> > Link: https://syzkaller.appspot.com/bug?id=0ba17d70d062b2595e1f061231474800f076c7cb
> > Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> > Reported-by: syzbot+0871b14ca2e2fb64f6e3@syzkaller.appspotmail.com
> > Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> > Cc: "James (Qian) Wang" <james.qian.wang@arm.com>
> > Cc: Liviu Dudau <liviu.dudau@arm.com>
> > Cc: Mihail Atanassov <mihail.atanassov@arm.com>
> > Cc: Brian Starkey <brian.starkey@arm.com>
> > Cc: Sam Ravnborg <sam@ravnborg.org>
> > Cc: Boris Brezillon <bbrezillon@kernel.org>
> > Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
> > Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
> > Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
> > Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > Cc: Maxime Ripard <mripard@kernel.org>
> > Cc: Thomas Zimmermann <tzimmermann@suse.de>
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Cc: Thierry Reding <thierry.reding@gmail.com>
> > Cc: Jonathan Hunter <jonathanh@nvidia.com>
> > Cc: Jyri Sarha <jsarha@ti.com>
> > Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
> > Cc: Rob Clark <robdclark@gmail.com>
> > Cc: Sean Paul <seanpaul@chromium.org>
> > Cc: Brian Masney <masneyb@onstation.org>
> > Cc: Emil Velikov <emil.velikov@collabora.com>
> > Cc: zhengbin <zhengbin13@huawei.com>
> > Cc: Thomas Gleixner <tglx@linutronix.de>
> > Cc: linux-tegra@vger.kernel.org
> > Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> > ---
> > drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 7 ++-----
> > drivers/gpu/drm/arm/malidp_drv.c | 1 -
> > drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 7 ++-----
> > drivers/gpu/drm/drm_atomic_state_helper.c | 4 ++++
> > drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c | 2 --
> > drivers/gpu/drm/omapdrm/omap_drv.c | 3 ---
> > drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 3 ---
> > drivers/gpu/drm/tegra/dc.c | 1 -
> > drivers/gpu/drm/tidss/tidss_crtc.c | 3 +--
> > drivers/gpu/drm/tidss/tidss_kms.c | 4 ----
> > 10 files changed, 9 insertions(+), 26 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > index 56bd938961ee..f33418d6e1a0 100644
> > --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> > @@ -492,10 +492,8 @@ static void komeda_crtc_reset(struct drm_crtc *crtc)
> > crtc->state = NULL;
> >
> > state = kzalloc(sizeof(*state), GFP_KERNEL);
> > - if (state) {
> > - crtc->state = &state->base;
> > - crtc->state->crtc = crtc;
> > - }
> > + if (state)
> > + __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > }
> >
> > static struct drm_crtc_state *
> > @@ -616,7 +614,6 @@ static int komeda_crtc_add(struct komeda_kms_dev *kms,
> > return err;
> >
> > drm_crtc_helper_add(crtc, &komeda_crtc_helper_funcs);
> > - drm_crtc_vblank_reset(crtc);
> >
> > crtc->port = kcrtc->master->of_output_port;
> >
> > diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
> > index c2507b7d8512..02904392e370 100644
> > --- a/drivers/gpu/drm/arm/malidp_drv.c
> > +++ b/drivers/gpu/drm/arm/malidp_drv.c
> > @@ -870,7 +870,6 @@ static int malidp_bind(struct device *dev)
> > drm->irq_enabled = true;
> >
> > ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
> > - drm_crtc_vblank_reset(&malidp->crtc);
> > if (ret < 0) {
> > DRM_ERROR("failed to initialise vblank\n");
> > goto vblank_fail;
> > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > index 10985134ce0b..ce246b96330b 100644
> > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
> > @@ -411,10 +411,8 @@ static void atmel_hlcdc_crtc_reset(struct drm_crtc *crtc)
> > }
> >
> > state = kzalloc(sizeof(*state), GFP_KERNEL);
> > - if (state) {
> > - crtc->state = &state->base;
> > - crtc->state->crtc = crtc;
> > - }
> > + if (state)
> > + __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > }
> >
> > static struct drm_crtc_state *
> > @@ -528,7 +526,6 @@ int atmel_hlcdc_crtc_create(struct drm_device *dev)
> > }
> >
> > drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
> > - drm_crtc_vblank_reset(&crtc->base);
> >
> > drm_mode_crtc_set_gamma_size(&crtc->base, ATMEL_HLCDC_CLUT_SIZE);
> > drm_crtc_enable_color_mgmt(&crtc->base, 0, false,
> > diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c
> > index 8fce6a115dfe..9ad74045158e 100644
> > --- a/drivers/gpu/drm/drm_atomic_state_helper.c
> > +++ b/drivers/gpu/drm/drm_atomic_state_helper.c
> > @@ -32,6 +32,7 @@
> > #include <drm/drm_device.h>
> > #include <drm/drm_plane.h>
> > #include <drm/drm_print.h>
> > +#include <drm/drm_vblank.h>
> > #include <drm/drm_writeback.h>
> >
> > #include <linux/slab.h>
> > @@ -93,6 +94,9 @@ __drm_atomic_helper_crtc_reset(struct drm_crtc *crtc,
> > if (crtc_state)
> > __drm_atomic_helper_crtc_state_reset(crtc_state, crtc);
> >
> > + if (drm_dev_has_vblank(crtc->dev))
> > + drm_crtc_vblank_reset(crtc);
> > +
> > crtc->state = crtc_state;
> > }
> > EXPORT_SYMBOL(__drm_atomic_helper_crtc_reset);
> > diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > index ca3368c828d0..9606185c284b 100644
> > --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
> > @@ -1117,8 +1117,6 @@ static void mdp5_crtc_reset(struct drm_crtc *crtc)
> > mdp5_crtc_destroy_state(crtc, crtc->state);
> >
> > __drm_atomic_helper_crtc_reset(crtc, &mdp5_cstate->base);
> > -
> > - drm_crtc_vblank_reset(crtc);
> > }
> >
> > static const struct drm_crtc_funcs mdp5_crtc_funcs = {
> > diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
> > index 242d28281784..7a7066cded79 100644
> > --- a/drivers/gpu/drm/omapdrm/omap_drv.c
> > +++ b/drivers/gpu/drm/omapdrm/omap_drv.c
> > @@ -642,9 +642,6 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
> > goto err_cleanup_modeset;
> > }
> >
> > - for (i = 0; i < priv->num_pipes; i++)
> > - drm_crtc_vblank_off(priv->pipes[i].crtc);
> > -
> > omap_fbdev_init(ddev);
> >
> > drm_kms_helper_poll_init(ddev);
> > diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > index d73e88ddecd0..e2959e32fd19 100644
> > --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> > @@ -1271,9 +1271,6 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int swindex,
> >
> > drm_crtc_helper_add(crtc, &crtc_helper_funcs);
> >
> > - /* Start with vertical blanking interrupt reporting disabled. */
> > - drm_crtc_vblank_off(crtc);
> > -
>
> I'm sure I've added this code for a good reason, I would have sworn that
> vblank would be either broken or would complain very loudly without this
> call. I've however tested this patch, and haven't noticed any
> regression. Has something changed since I've added the call to
> drm_crtc_vblank_off() in the rcar-du driver ? It can't be
> __drm_atomic_helper_crtc_reset() handling it, as the rcar-du driver has
> a custom CRTC reset handler that doesn't call
> __drm_atomic_helper_crtc_reset(). If it works without calling
> drm_crtc_vblank_off() or drm_crtc_vblank_reset(), what's the purpose of
> drm_crtc_vblank_reset() ?
>
> /me is very puzzled
Uh yeah this breaks stuff, I forgot to review the two drivers I've
changed to make sure they're using the __drm_atomic_helper_crtc_reset
function. Like they should. I'll respin.
-Daniel
> > /* Register the interrupt handler. */
> > if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
> > /* The IRQ's are associated with the CRTC (sw)index. */
> > diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> > index 83f31c6e891c..9b308b572eac 100644
> > --- a/drivers/gpu/drm/tegra/dc.c
> > +++ b/drivers/gpu/drm/tegra/dc.c
> > @@ -1168,7 +1168,6 @@ static void tegra_crtc_reset(struct drm_crtc *crtc)
> > tegra_crtc_atomic_destroy_state(crtc, crtc->state);
> >
> > __drm_atomic_helper_crtc_reset(crtc, &state->base);
> > - drm_crtc_vblank_reset(crtc);
> > }
> >
> > static struct drm_crtc_state *
> > diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c
> > index 89a226912de8..4d01c4af61cd 100644
> > --- a/drivers/gpu/drm/tidss/tidss_crtc.c
> > +++ b/drivers/gpu/drm/tidss/tidss_crtc.c
> > @@ -352,8 +352,7 @@ static void tidss_crtc_reset(struct drm_crtc *crtc)
> > return;
> > }
> >
> > - crtc->state = &tcrtc->base;
> > - crtc->state->crtc = crtc;
> > + __drm_atomic_helper_crtc_reset(crtc, &tcrtc->base);
> > }
> >
> > static struct drm_crtc_state *tidss_crtc_duplicate_state(struct drm_crtc *crtc)
> > diff --git a/drivers/gpu/drm/tidss/tidss_kms.c b/drivers/gpu/drm/tidss/tidss_kms.c
> > index 4b99e9fa84a5..e6ab59eed259 100644
> > --- a/drivers/gpu/drm/tidss/tidss_kms.c
> > +++ b/drivers/gpu/drm/tidss/tidss_kms.c
> > @@ -278,10 +278,6 @@ int tidss_modeset_init(struct tidss_device *tidss)
> > if (ret)
> > return ret;
> >
> > - /* Start with vertical blanking interrupt reporting disabled. */
> > - for (i = 0; i < tidss->num_crtcs; ++i)
> > - drm_crtc_vblank_reset(tidss->crtcs[i]);
> > -
> > drm_mode_config_reset(ddev);
> >
> > dev_dbg(tidss->dev, "%s done\n", __func__);
>
> --
> Regards,
>
> Laurent Pinchart
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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next prev parent reply other threads:[~2020-06-03 7:55 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 9:51 [PATCH 1/3] drm/atomic-helper: reset vblank on crtc reset Daniel Vetter
2020-06-02 9:51 ` [Intel-gfx] " Daniel Vetter
2020-06-02 9:51 ` Daniel Vetter
2020-06-02 9:51 ` [PATCH 2/3] drm/malidp: Don't call drm_crtc_vblank_off on unbind Daniel Vetter
2020-06-02 9:51 ` [Intel-gfx] " Daniel Vetter
2020-06-02 9:55 ` [PATCH] " Daniel Vetter
2020-06-02 9:55 ` [Intel-gfx] " Daniel Vetter
2020-06-02 13:02 ` Liviu Dudau
2020-06-02 13:02 ` [Intel-gfx] " Liviu Dudau
2020-06-02 12:59 ` [PATCH 2/3] " Liviu Dudau
2020-06-02 12:59 ` [Intel-gfx] " Liviu Dudau
2020-06-02 9:51 ` [PATCH 3/3] drm/hdlcd: " Daniel Vetter
2020-06-02 9:51 ` [Intel-gfx] " Daniel Vetter
2020-06-02 13:00 ` Liviu Dudau
2020-06-02 13:00 ` [Intel-gfx] " Liviu Dudau
2020-06-03 13:46 ` Daniel Vetter
2020-06-03 13:46 ` [Intel-gfx] " Daniel Vetter
2020-06-02 12:11 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/3] drm/atomic-helper: reset vblank on crtc reset (rev2) Patchwork
2020-06-02 12:33 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2020-06-02 19:44 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
[not found] ` <20200602095140.36678-1-daniel.vetter-/w4YWyX8dFk@public.gmane.org>
2020-06-03 0:19 ` [PATCH 1/3] drm/atomic-helper: reset vblank on crtc reset Laurent Pinchart
2020-06-03 0:19 ` [Intel-gfx] " Laurent Pinchart
2020-06-03 0:19 ` Laurent Pinchart
[not found] ` <20200603001900.GV6547-N3hz7ZxfLydczECFQUw77jytWr6r+dGw0E9HWUfgJXw@public.gmane.org>
2020-06-03 7:55 ` Daniel Vetter [this message]
2020-06-03 7:55 ` [Intel-gfx] " Daniel Vetter
2020-06-03 7:55 ` Daniel Vetter
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