drm/i915/display: Drop check for doublescan mode in modevalid

BugLink: https://bugs.launchpad.net/bugs/1993561

Since the DP/HDMI connector do not set connector->doublescan_allowed,
the doublescan modes will get automatically filtered during
drm_helper_probe_single_connector_modes().

Therefore check for double scan modes is not required and is dropped
from modevalid functions for both DP and HDMI.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221017143038.1748319-2-ankit.k.nautiyal@intel.com
(cherry picked from commit 9d04eb2)
Signed-off-by: Koba Ko <koba.ko@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Timo Aaltonen <timo.aaltonen@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

drivers/gpu/drm/i915/display/intel_dp.c

@@ -974,9 +974,6 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 	enum drm_mode_status status;
 	bool dsc = false, bigjoiner = false;
 
-	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
-		return MODE_NO_DBLESCAN;
-
 	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
 		return MODE_H_ILLEGAL;
 

drivers/gpu/drm/i915/display/intel_hdmi.c

@@ -1988,9 +1988,6 @@ intel_hdmi_mode_valid(struct drm_connector *connector,
 	bool has_hdmi_sink = intel_has_hdmi_sink(hdmi, connector->state);
 	bool ycbcr_420_only;
 
-	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
-		return MODE_NO_DBLESCAN;
-
 	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) == DRM_MODE_FLAG_3D_FRAME_PACKING)
 		clock *= 2;