drm/i915/edp: reject modes with dimensions other than fixed mode

Be more strict about filtering modes for eDP.

Cc: Nischal Varide <nischal.varide@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/feb4c3b2b9c4da56a840bdb3c0e7fd0e58ee50de.1613054234.git.jani.nikula@intel.com

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

@@ -789,10 +789,10 @@ intel_dp_mode_valid(struct drm_connector *connector,
 		return MODE_H_ILLEGAL;
 
 	if (intel_dp_is_edp(intel_dp) && fixed_mode) {
-		if (mode->hdisplay > fixed_mode->hdisplay)
+		if (mode->hdisplay != fixed_mode->hdisplay)
 			return MODE_PANEL;
 
-		if (mode->vdisplay > fixed_mode->vdisplay)
+		if (mode->vdisplay != fixed_mode->vdisplay)
 			return MODE_PANEL;
 
 		target_clock = fixed_mode->clock;