Prevent accessing the HW from the SDVO/TV get_modes connector hook.
Returning 0 from the hook will make the caller -
drm_helper_probe_single_connector_modes() - return a default/EDID
override mode list to users. This matches the case where
intel_sdvo_get_tv_modes() fails to retrieve the current mode list due to
a HW access failure.
v2: Clarify the commit message wrt. which modes get_modes() returns. (Jouni)
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_sdvo.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index 2571ef5a1b211..ccea0efbd136f 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -2287,6 +2287,7 @@ static const struct drm_display_mode sdvo_tv_modes[] = {
static int intel_sdvo_get_tv_modes(struct drm_connector *connector)
{
struct intel_sdvo *intel_sdvo = intel_attached_sdvo(to_intel_connector(connector));
+ struct drm_i915_private *i915 = to_i915(intel_sdvo->base.base.dev);
struct intel_sdvo_connector *intel_sdvo_connector =
to_intel_sdvo_connector(connector);
const struct drm_connector_state *conn_state = connector->state;
@@ -2298,6 +2299,9 @@ static int intel_sdvo_get_tv_modes(struct drm_connector *connector)
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
connector->base.id, connector->name);
+ if (!intel_display_driver_check_access(i915))
+ return 0;
+
/*
* Read the list of supported input resolutions for the selected TV
* format.
--
2.39.2
