On Wed, May 10, 2023 at 01:31:30PM +0300, Imre Deak wrote: > Call the TypeC port flush_work and cleanup handlers without the modeset > locks held. These don't require the locks, as the work takes - as it > should be able to at any point in time - any locks it needs and by the > time cleanup is called and after cleanup returns the encoder is not in > use. > > This is required by the next patch canceling a TypeC port work > synchronously during encoder suspend and shutdown, where the work can > take modeset locks as well, hence the canceling must be done without > holding the locks. > > I also considered moving the modeset locking down to each encoder > suspend()/shutdown() hook instead, however locking the full modeset > state for each encoder separately would be odd, and the bigger change - > affecting all encoders - is beyond the scope of this patchset.
Hmm. What is it in the encoder shutdown/suspend hooks that actually needs the modeset locks? > > Cc: Ville Syrjälä <ville.syrj...@linux.intel.com> > Signed-off-by: Imre Deak <imre.d...@intel.com> > --- > drivers/gpu/drm/i915/display/intel_ddi.c | 27 +++++++++---------- > .../drm/i915/display/intel_display_types.h | 12 +++++++++ > drivers/gpu/drm/i915/i915_driver.c | 8 ++++++ > 3 files changed, 33 insertions(+), 14 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c > b/drivers/gpu/drm/i915/display/intel_ddi.c > index 813be957ed11b..7d09bd2412352 100644 > --- a/drivers/gpu/drm/i915/display/intel_ddi.c > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c > @@ -4617,31 +4617,27 @@ static bool intel_ddi_is_tc(struct drm_i915_private > *i915, enum port port) > > static void intel_ddi_encoder_suspend(struct intel_encoder *encoder) > { > - struct intel_dp *intel_dp = enc_to_intel_dp(encoder); > - struct drm_i915_private *i915 = dp_to_i915(intel_dp); > - struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); > - enum phy phy = intel_port_to_phy(i915, encoder->port); > - > intel_dp_encoder_suspend(encoder); > +} > > - if (!intel_phy_is_tc(i915, phy)) > - return; > +static void intel_ddi_tc_encoder_suspend_complete(struct intel_encoder > *encoder) > +{ > + struct intel_dp *intel_dp = enc_to_intel_dp(encoder); > + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); > > intel_tc_port_flush_work(dig_port); > } > > static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder) > { > - struct intel_dp *intel_dp = enc_to_intel_dp(encoder); > - struct drm_i915_private *i915 = dp_to_i915(intel_dp); > - struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); > - enum phy phy = intel_port_to_phy(i915, encoder->port); > - > intel_dp_encoder_shutdown(encoder); > intel_hdmi_encoder_shutdown(encoder); > +} > > - if (!intel_phy_is_tc(i915, phy)) > - return; > +static void intel_ddi_tc_encoder_shutdown_complete(struct intel_encoder > *encoder) > +{ > + struct intel_dp *intel_dp = enc_to_intel_dp(encoder); > + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); > > intel_tc_port_cleanup(dig_port); > } > @@ -4908,6 +4904,9 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, > enum port port) > is_legacy ? "legacy" : "non-legacy"); > } > > + encoder->suspend_complete = > intel_ddi_tc_encoder_suspend_complete; > + encoder->shutdown_complete = > intel_ddi_tc_encoder_shutdown_complete; > + > if (intel_tc_port_init(dig_port, is_legacy) < 0) > goto err; > } > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h > b/drivers/gpu/drm/i915/display/intel_display_types.h > index 270c4c84a2920..88b2a55d19f21 100644 > --- a/drivers/gpu/drm/i915/display/intel_display_types.h > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h > @@ -233,13 +233,25 @@ struct intel_encoder { > * Called during system suspend after all pending requests for the > * encoder are flushed (for example for DP AUX transactions) and > * device interrupts are disabled. > + * All modeset locks are held while the hook is called. > */ > void (*suspend)(struct intel_encoder *); > + /* > + * Called without the modeset locks held after the suspend() hook for > + * all encoders have been called. > + */ > + void (*suspend_complete)(struct intel_encoder *encoder); > /* > * Called during system reboot/shutdown after all the > * encoders have been disabled and suspended. > + * All modeset locks are held while the hook is called. > */ > void (*shutdown)(struct intel_encoder *encoder); > + /* > + * Called without the modeset locks held after the shutdown() hook for > + * all encoders have been called. > + */ > + void (*shutdown_complete)(struct intel_encoder *encoder); > /* > * Enable/disable the clock to the port. > */ > diff --git a/drivers/gpu/drm/i915/i915_driver.c > b/drivers/gpu/drm/i915/i915_driver.c > index fd198700272b1..705ba65f2ff9a 100644 > --- a/drivers/gpu/drm/i915/i915_driver.c > +++ b/drivers/gpu/drm/i915/i915_driver.c > @@ -964,6 +964,10 @@ static void intel_suspend_encoders(struct > drm_i915_private *dev_priv) > if (encoder->suspend) > encoder->suspend(encoder); > drm_modeset_unlock_all(&dev_priv->drm); > + > + for_each_intel_encoder(&dev_priv->drm, encoder) > + if (encoder->suspend_complete) > + encoder->suspend_complete(encoder); > } > > static void intel_shutdown_encoders(struct drm_i915_private *dev_priv) > @@ -978,6 +982,10 @@ static void intel_shutdown_encoders(struct > drm_i915_private *dev_priv) > if (encoder->shutdown) > encoder->shutdown(encoder); > drm_modeset_unlock_all(&dev_priv->drm); > + > + for_each_intel_encoder(&dev_priv->drm, encoder) > + if (encoder->shutdown_complete) > + encoder->shutdown_complete(encoder); > } > > void i915_driver_shutdown(struct drm_i915_private *i915) > -- > 2.37.2 -- Ville Syrjälä Intel