From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga05.intel.com ([192.55.52.43]:13228 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751496AbdFAQF7 (ORCPT ); Thu, 1 Jun 2017 12:05:59 -0400 Date: Thu, 1 Jun 2017 19:05:41 +0300 From: Ville =?iso-8859-1?Q?Syrj=E4l=E4?= To: Jani Nikula Cc: intel-gfx@lists.freedesktop.org, stable@vger.kernel.org Subject: Re: [Intel-gfx] [PATCH 2/7] drm/i915: Plumb the correct acquire ctx into intel_crtc_disable_noatomic() Message-ID: <20170601160541.GQ12629@intel.com> References: <20170601143619.27840-1-ville.syrjala@linux.intel.com> <20170601143619.27840-3-ville.syrjala@linux.intel.com> <87lgpbhihb.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <87lgpbhihb.fsf@intel.com> Sender: stable-owner@vger.kernel.org List-ID: On Thu, Jun 01, 2017 at 05:48:16PM +0300, Jani Nikula wrote: > On Thu, 01 Jun 2017, ville.syrjala@linux.intel.com wrote: > > From: Ville Syrj�l� > > > > If intel_crtc_disable_noatomic() were to ever get called during resume > > e'd end up deadlocking since resume has its own acqcuire_ctx but > > intel_crtc_disable_noatomic() still tries to use the > > mode_config.acquire_ctx. Pass down the correct acquire ctx from the top. > > Same here, have we seen this, or "just" theoretical? Happens on my 830 after adding the pipes powerwell. Before that the machine resumed with both pipes off and the pipe A quirk left crtc->active as false so intel_crtc_disable_noatomic() didn't get called. Hmm. Actually, now that I think about it more, I believe this should happen for S4 even without the new powerwell since both pipes should have been enabled by the BIOS when resuming from S4. I'll have to run a proper to test to verify that. > > BR, > Jani. > > > > > Cc: stable@vger.kernel.org > > Cc: Maarten Lankhorst > > Fixes: e2c8b8701e2d ("drm/i915: Use atomic helpers for suspend, v2.") > > Signed-off-by: Ville Syrj�l� > > --- > > drivers/gpu/drm/i915/intel_display.c | 9 +++++---- > > 1 file changed, 5 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c > > index 2f76a63efe8c..4e3c64ed4131 100644 > > --- a/drivers/gpu/drm/i915/intel_display.c > > +++ b/drivers/gpu/drm/i915/intel_display.c > > @@ -5839,7 +5839,8 @@ static void i9xx_crtc_disable(struct intel_crtc_state *old_crtc_state, > > intel_update_watermarks(intel_crtc); > > } > > > > -static void intel_crtc_disable_noatomic(struct drm_crtc *crtc) > > +static void intel_crtc_disable_noatomic(struct drm_crtc *crtc, > > + struct drm_modeset_acquire_ctx *ctx) > > { > > struct intel_encoder *encoder; > > struct intel_crtc *intel_crtc = to_intel_crtc(crtc); > > @@ -5869,7 +5870,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc) > > return; > > } > > > > - state->acquire_ctx = crtc->dev->mode_config.acquire_ctx; > > + state->acquire_ctx = ctx; > > > > /* Everything's already locked, -EDEADLK can't happen. */ > > crtc_state = intel_atomic_get_crtc_state(state, intel_crtc); > > @@ -15257,7 +15258,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc, > > plane = crtc->plane; > > crtc->base.primary->state->visible = true; > > crtc->plane = !plane; > > - intel_crtc_disable_noatomic(&crtc->base); > > + intel_crtc_disable_noatomic(&crtc->base, ctx); > > crtc->plane = plane; > > } > > > > @@ -15273,7 +15274,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc, > > /* Adjust the state of the output pipe according to whether we > > * have active connectors/encoders. */ > > if (crtc->active && !intel_crtc_has_encoders(crtc)) > > - intel_crtc_disable_noatomic(&crtc->base); > > + intel_crtc_disable_noatomic(&crtc->base, ctx); > > > > if (crtc->active || HAS_GMCH_DISPLAY(dev_priv)) { > > /* > > -- > Jani Nikula, Intel Open Source Technology Center -- Ville Syrj�l� Intel OTC