drm/i915: Use luminance range calculated during edid parsing

Instead of using fixed 0 - 512 range use luminance range calculated
as a part of edid parsing. As a backup fall back to static 0 - 512.

v3: Clean-ups suggested by Jani Nikula
v2: Use values calculated during edid parsing

Cc: Lyude Paul <lyude@redhat.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220719095700.14923-4-jouni.hogander@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index c92d5bb2326a39cc103759b4d79f92ef7fa5f3cc..83af95bce98dd0f83dddce04c49d2aa338e64ba6 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -278,6 +278,8 @@ intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pi
 {
        struct drm_i915_private *i915 = to_i915(connector->base.dev);
        struct intel_panel *panel = &connector->panel;
+       struct drm_luminance_range_info *luminance_range =
+               &connector->base.display_info.luminance_range;
        int ret;
 
        if (panel->backlight.edp.intel.sdr_uses_aux) {
@@ -293,8 +295,17 @@ intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pi
                }
        }
 
-       panel->backlight.max = 512;
-       panel->backlight.min = 0;
+       if (luminance_range->max_luminance) {
+               panel->backlight.max = luminance_range->max_luminance;
+               panel->backlight.min = luminance_range->min_luminance;
+       } else {
+               panel->backlight.max = 512;
+               panel->backlight.min = 0;
+       }
+
+       drm_dbg_kms(&i915->drm, "Using backlight range %d..%d\n", panel->backlight.min,
+                   panel->backlight.max);
+
        panel->backlight.level = intel_dp_aux_hdr_get_backlight(connector, pipe);
        panel->backlight.enabled = panel->backlight.level != 0;