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drm/i915: Prevent HW access during init from SDVO TV get_modes hook

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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@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240212175237.2625812-1-imre.deak@intel.com
This commit is contained in:
Imre Deak 2024-02-12 19:52:36 +02:00
parent 00c3959d63
commit 5c5a7fa612
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/display/intel_sdvo.c
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@ -2312,6 +2312,9 @@ static int intel_sdvo_get_tv_modes(struct drm_connector *connector)
drm_dbg_kms(&i915->drm, "[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.