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Fri, 06 Jan 2023 09:53:51 -0800 (PST) Date: Fri, 6 Jan 2023 18:53:49 +0100 From: Daniel Vetter To: Brian Norris Cc: Heiko =?iso-8859-1?Q?St=FCbner?= , Sean Paul , Michel =?iso-8859-1?Q?D=E4nzer?= , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Sandy Huang , linux-rockchip@lists.infradead.org, stable@vger.kernel.org Subject: Re: [PATCH 1/2] drm/atomic: Allow vblank-enabled + self-refresh "disable" Message-ID: Mail-Followup-To: Brian Norris , Heiko =?iso-8859-1?Q?St=FCbner?= , Sean Paul , Michel =?iso-8859-1?Q?D=E4nzer?= , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Sandy Huang , linux-rockchip@lists.infradead.org, stable@vger.kernel.org References: <20230105174001.1.I3904f697863649eb1be540ecca147a66e42bfad7@changeid> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230105174001.1.I3904f697863649eb1be540ecca147a66e42bfad7@changeid> X-Operating-System: Linux phenom 5.19.0-2-amd64 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230106_095356_548213_B990AA06 X-CRM114-Status: GOOD ( 24.99 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org On Thu, Jan 05, 2023 at 05:40:17PM -0800, Brian Norris wrote: > The self-refresh helper framework overloads "disable" to sometimes mean > "go into self-refresh mode," and this mode activates automatically > (e.g., after some period of unchanging display output). In such cases, > the display pipe is still considered "on", and user-space is not aware > that we went into self-refresh mode. Thus, users may expect that > vblank-related features (such as DRM_IOCTL_WAIT_VBLANK) still work > properly. > > However, we trigger the WARN_ONCE() here if a CRTC driver tries to leave > vblank enabled here. > > Add a new exception, such that we allow CRTCs to be "disabled" (with > self-refresh active) with vblank interrupts still enabled. > > Cc: # dependency for subsequent patch > Signed-off-by: Brian Norris > --- > > drivers/gpu/drm/drm_atomic_helper.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c > index d579fd8f7cb8..7b5eddadebd5 100644 > --- a/drivers/gpu/drm/drm_atomic_helper.c > +++ b/drivers/gpu/drm/drm_atomic_helper.c > @@ -1207,6 +1207,12 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state) > > if (!drm_dev_has_vblank(dev)) > continue; > + /* > + * Self-refresh is not a true "disable"; let vblank remain > + * enabled. > + */ > + if (new_crtc_state->self_refresh_active) > + continue; This very fishy, because we check in crtc_needs_disable whether this output should stay on due to self-refresh. Which means you should never end up in here. And yes vblank better work in self refresh :-) If it doesn't, then you need to fake it with a timer, that's at least what i915 has done for transparent self-refresh. We might need a few more helpers. Also, probably more igt, or is this something igt testing has uncovered? If so, please cite the igt testcase which hits this. -Daniel > > ret = drm_crtc_vblank_get(crtc); > WARN_ONCE(ret != -EINVAL, "driver forgot to call drm_crtc_vblank_off()\n"); > -- > 2.39.0.314.g84b9a713c41-goog > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip