drm/i915: Introduce intel_panel_compute_config()

Let's introduce a compute_config() helper for fixed mode panels.
For now all it does is the fixed_mode->adjusted_mode copy.

Note that with sDVO we have to ask the external encoder chip
to spit out our actual display timings for us, so the fixed_mode
to adjusted_mode copy done by intel_panel_compute_config() is
redundant, but we still want to use it to do other checks for us
later. We'll be fine so long as we only call it before
intel_sdvo_get_preferred_input_mode() overwrites adjusted_mode
with the timings from the encoder.

v2: Use intel_panel_compute_config() with sDVO

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210927185207.13620-1-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index b2ad0f065218..77c1ca387de0 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -45,12 +45,19 @@ bool intel_panel_use_ssc(struct drm_i915_private *i915)
 		&& !(i915->quirks & QUIRK_LVDS_SSC_DISABLE);
 }
 
-void intel_panel_fixed_mode(const struct drm_display_mode *fixed_mode,
-			    struct drm_display_mode *adjusted_mode)
+int intel_panel_compute_config(struct intel_connector *connector,
+			       struct drm_display_mode *adjusted_mode)
 {
+	const struct drm_display_mode *fixed_mode = connector->panel.fixed_mode;
+
+	if (!fixed_mode)
+		return 0;
+
 	drm_mode_copy(adjusted_mode, fixed_mode);
 
 	drm_mode_set_crtcinfo(adjusted_mode, 0);
+
+	return 0;
 }
 
 static bool is_downclock_mode(const struct drm_display_mode *downclock_mode,