[PATCH 2/3][SRU][L/K] drm/i915/display: Prune Interlace modes for Display >=12

[Koba Ko]

From: Ankit Nautiyal <ankit.k.nautiyal at intel.com>

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

Defeature Display Interlace support.
Support for interlace modes is removed from Gen 12 onwards.
Pruning the interlace modes for HDMI for Display >=12.
Bspec: 50490

v2: Add check for both DP and HDMI. (Ville)
Get rid of redundant check for interlace mode in modevalid. (Ville)

v3: Simplify the condition to avoid interlace modes. (Jani)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Reviewed-by: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230105124125.1129653-1-ankit.k.nautiyal@intel.com
(cherry picked from commit f71c9b7bc35ff7c1fb68d114903876eec658439b)
Signed-off-by: Koba Ko <koba.ko at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c   |  4 ++--
 drivers/gpu/drm/i915/display/intel_hdmi.c | 11 +++++++++--
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 7360effb724eb..a912ef24be11f 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1981,7 +1981,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return -EINVAL;
 
-	if (HAS_GMCH(dev_priv) &&
+	if (!connector->base.interlace_allowed &&
 	    adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
 		return -EINVAL;
 
@@ -5323,7 +5323,7 @@ intel_dp_init_connector(struct intel_digital_port *dig_port,
 	drm_connector_init(dev, connector, &intel_dp_connector_funcs, type);
 	drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);
 
-	if (!HAS_GMCH(dev_priv))
+	if (!HAS_GMCH(dev_priv) && DISPLAY_VER(dev_priv) < 12)
 		connector->interlace_allowed = true;
 	connector->doublescan_allowed = 0;
 
diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 0cff29ac3c2d1..894973d36d73a 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2234,6 +2234,10 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
 	if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 		return -EINVAL;
 
+	if (!connector->interlace_allowed &&
+	    adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
+		return -EINVAL;
+
 	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 	pipe_config->has_hdmi_sink = intel_has_hdmi_sink(intel_hdmi,
 							 conn_state);
@@ -2943,9 +2947,12 @@ void intel_hdmi_init_connector(struct intel_digital_port *dig_port,
 				    ddc);
 	drm_connector_helper_add(connector, &intel_hdmi_connector_helper_funcs);
 
-	connector->interlace_allowed = 1;
+	if (DISPLAY_VER(dev_priv) < 12)
+		connector->interlace_allowed = true;
+
 	connector->doublescan_allowed = 0;
-	connector->stereo_allowed = 1;
+
+	connector->stereo_allowed = true;
 
 	if (DISPLAY_VER(dev_priv) >= 10)
 		connector->ycbcr_420_allowed = true;
-- 
2.25.1