Re: [PATCH 1/7] drm/i915: Fix deadlock witha the pipe A quirk during resume

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Jun 01, 2017 at 05:47:45PM +0300, Jani Nikula wrote:
> On Thu, 01 Jun 2017, ville.syrjala@linux.intel.com wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >
> > Pass down the correct acquire context to the pipe A quirk load detect
> > hack during display resume. Avoids deadlocking the entire thing.
> 
> Have we seen this in the wild? References?

My 830.

> 
> BR,
> Jani.
> 
> >
> > Cc: stable@vger.kernel.org
> > Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> > Fixes: e2c8b8701e2d ("drm/i915: Use atomic helpers for suspend, v2.")
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c | 21 ++++++++++++---------
> >  1 file changed, 12 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index ed41b59ee8e3..2f76a63efe8c 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -120,7 +120,8 @@ static void intel_crtc_init_scalers(struct intel_crtc *crtc,
> >  static void skylake_pfit_enable(struct intel_crtc *crtc);
> >  static void ironlake_pfit_disable(struct intel_crtc *crtc, bool force);
> >  static void ironlake_pfit_enable(struct intel_crtc *crtc);
> > -static void intel_modeset_setup_hw_state(struct drm_device *dev);
> > +static void intel_modeset_setup_hw_state(struct drm_device *dev,
> > +					 struct drm_modeset_acquire_ctx *ctx);
> >  static void intel_pre_disable_primary_noatomic(struct drm_crtc *crtc);
> >  
> >  struct intel_limit {
> > @@ -3461,7 +3462,7 @@ __intel_display_resume(struct drm_device *dev,
> >  	struct drm_crtc *crtc;
> >  	int i, ret;
> >  
> > -	intel_modeset_setup_hw_state(dev);
> > +	intel_modeset_setup_hw_state(dev, ctx);
> >  	i915_redisable_vga(to_i915(dev));
> >  
> >  	if (!state)
> > @@ -15094,7 +15095,7 @@ int intel_modeset_init(struct drm_device *dev)
> >  	intel_setup_outputs(dev_priv);
> >  
> >  	drm_modeset_lock_all(dev);
> > -	intel_modeset_setup_hw_state(dev);
> > +	intel_modeset_setup_hw_state(dev, dev->mode_config.acquire_ctx);
> >  	drm_modeset_unlock_all(dev);
> >  
> >  	for_each_intel_crtc(dev, crtc) {
> > @@ -15131,13 +15132,13 @@ int intel_modeset_init(struct drm_device *dev)
> >  	return 0;
> >  }
> >  
> > -static void intel_enable_pipe_a(struct drm_device *dev)
> > +static void intel_enable_pipe_a(struct drm_device *dev,
> > +				struct drm_modeset_acquire_ctx *ctx)
> >  {
> >  	struct intel_connector *connector;
> >  	struct drm_connector_list_iter conn_iter;
> >  	struct drm_connector *crt = NULL;
> >  	struct intel_load_detect_pipe load_detect_temp;
> > -	struct drm_modeset_acquire_ctx *ctx = dev->mode_config.acquire_ctx;
> >  	int ret;
> >  
> >  	/* We can't just switch on the pipe A, we need to set things up with a
> > @@ -15209,7 +15210,8 @@ static bool has_pch_trancoder(struct drm_i915_private *dev_priv,
> >  		(HAS_PCH_LPT_H(dev_priv) && pch_transcoder == TRANSCODER_A);
> >  }
> >  
> > -static void intel_sanitize_crtc(struct intel_crtc *crtc)
> > +static void intel_sanitize_crtc(struct intel_crtc *crtc,
> > +				struct drm_modeset_acquire_ctx *ctx)
> >  {
> >  	struct drm_device *dev = crtc->base.dev;
> >  	struct drm_i915_private *dev_priv = to_i915(dev);
> > @@ -15265,7 +15267,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc)
> >  		 * resume. Force-enable the pipe to fix this, the update_dpms
> >  		 * call below we restore the pipe to the right state, but leave
> >  		 * the required bits on. */
> > -		intel_enable_pipe_a(dev);
> > +		intel_enable_pipe_a(dev, ctx);
> >  	}
> >  
> >  	/* Adjust the state of the output pipe according to whether we
> > @@ -15568,7 +15570,8 @@ get_encoder_power_domains(struct drm_i915_private *dev_priv)
> >   * and sanitizes it to the current state
> >   */
> >  static void
> > -intel_modeset_setup_hw_state(struct drm_device *dev)
> > +intel_modeset_setup_hw_state(struct drm_device *dev,
> > +			     struct drm_modeset_acquire_ctx *ctx)
> >  {
> >  	struct drm_i915_private *dev_priv = to_i915(dev);
> >  	enum pipe pipe;
> > @@ -15588,7 +15591,7 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
> >  	for_each_pipe(dev_priv, pipe) {
> >  		crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
> >  
> > -		intel_sanitize_crtc(crtc);
> > +		intel_sanitize_crtc(crtc, ctx);
> >  		intel_dump_pipe_config(crtc, crtc->config,
> >  				       "[setup_hw_state]");
> >  	}
> 
> -- 
> Jani Nikula, Intel Open Source Technology Center

-- 
Ville Syrjälä
Intel OTC
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