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> --- 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); -- 2.39.2
