On Tue, 2024-02-06 at 17:39 +0200, Imre Deak wrote: > Prevent accessing the HW from the get_modes hooks of connectors > deriving > the mode list from the display's EDID. drm_edid_connector_add_modes() > will return the mode list based on the EDID which was cached during a > previous detection/get_modes call. > > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/10085 > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> Reviewed-by: Jouni Högander <jouni.hogander@xxxxxxxxx> > --- > drivers/gpu/drm/i915/display/intel_crt.c | 7 +++++++ > drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++++ > drivers/gpu/drm/i915/display/intel_dvo.c | 5 +++++ > drivers/gpu/drm/i915/display/intel_sdvo.c | 4 ++++ > 4 files changed, 20 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_crt.c > b/drivers/gpu/drm/i915/display/intel_crt.c > index b9733a73e21d4..27c5595e5d6bc 100644 > --- a/drivers/gpu/drm/i915/display/intel_crt.c > +++ b/drivers/gpu/drm/i915/display/intel_crt.c > @@ -646,9 +646,13 @@ static const struct drm_edid > *intel_crt_get_edid(struct drm_connector *connector > static int intel_crt_ddc_get_modes(struct drm_connector *connector, > struct i2c_adapter *ddc) > { > + struct drm_i915_private *i915 = to_i915(connector->dev); > const struct drm_edid *drm_edid; > int ret; > > + if (!intel_display_driver_check_access(i915)) > + return drm_edid_connector_add_modes(connector); > + > drm_edid = intel_crt_get_edid(connector, ddc); > if (!drm_edid) > return 0; > @@ -933,6 +937,9 @@ static int intel_crt_get_modes(struct > drm_connector *connector) > struct i2c_adapter *ddc; > int ret; > > + if (!intel_display_driver_check_access(dev_priv)) > + return drm_edid_connector_add_modes(connector); > + > wakeref = intel_display_power_get(dev_priv, > intel_encoder- > >power_domain); > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c > b/drivers/gpu/drm/i915/display/intel_dp_mst.c > index 5fa25a5a36b55..5307ddd4edcf5 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c > @@ -1197,6 +1197,7 @@ static bool > intel_dp_mst_initial_fastset_check(struct intel_encoder *encoder, > static int intel_dp_mst_get_ddc_modes(struct drm_connector > *connector) > { > struct intel_connector *intel_connector = > to_intel_connector(connector); > + struct drm_i915_private *i915 = to_i915(intel_connector- > >base.dev); > struct intel_dp *intel_dp = intel_connector->mst_port; > const struct drm_edid *drm_edid; > int ret; > @@ -1204,6 +1205,9 @@ static int intel_dp_mst_get_ddc_modes(struct > drm_connector *connector) > if (drm_connector_is_unregistered(connector)) > return intel_connector_update_modes(connector, NULL); > > + if (!intel_display_driver_check_access(i915)) > + return drm_edid_connector_add_modes(connector); > + > drm_edid = drm_dp_mst_edid_read(connector, &intel_dp- > >mst_mgr, intel_connector->port); > > ret = intel_connector_update_modes(connector, drm_edid); > diff --git a/drivers/gpu/drm/i915/display/intel_dvo.c > b/drivers/gpu/drm/i915/display/intel_dvo.c > index 8ca9ae4798a89..c076da75b066e 100644 > --- a/drivers/gpu/drm/i915/display/intel_dvo.c > +++ b/drivers/gpu/drm/i915/display/intel_dvo.c > @@ -30,6 +30,7 @@ > > #include <drm/drm_atomic_helper.h> > #include <drm/drm_crtc.h> > +#include <drm/drm_edid.h> > > #include "i915_drv.h" > #include "i915_reg.h" > @@ -338,8 +339,12 @@ intel_dvo_detect(struct drm_connector > *_connector, bool force) > static int intel_dvo_get_modes(struct drm_connector *_connector) > { > struct intel_connector *connector = > to_intel_connector(_connector); > + struct drm_i915_private *i915 = to_i915(connector->base.dev); > int num_modes; > > + if (!intel_display_driver_check_access(i915)) > + return drm_edid_connector_add_modes(&connector- > >base); > + > /* > * We should probably have an i2c driver get_modes function > for those > * devices which will have a fixed set of modes determined by > the chip > diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c > b/drivers/gpu/drm/i915/display/intel_sdvo.c > index ccea0efbd136f..dae5abf56bbf5 100644 > --- a/drivers/gpu/drm/i915/display/intel_sdvo.c > +++ b/drivers/gpu/drm/i915/display/intel_sdvo.c > @@ -2189,12 +2189,16 @@ intel_sdvo_detect(struct drm_connector > *connector, bool force) > > static int intel_sdvo_get_ddc_modes(struct drm_connector *connector) > { > + struct drm_i915_private *i915 = to_i915(connector->dev); > int num_modes = 0; > const struct drm_edid *drm_edid; > > DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", > connector->base.id, connector->name); > > + if (!intel_display_driver_check_access(i915)) > + return drm_edid_connector_add_modes(connector); > + > /* set the bus switch and get the modes */ > drm_edid = intel_sdvo_get_edid(connector); >
