[PATCH v2 4/4] drm/i915: Use luminance range calculated during edid parsing

[Jouni Högander]

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.

v2: Use values calculated during edid parsing

Cc: Lyude Paul <ly...@redhat.com>
Cc: Mika Kahola <mika.kah...@intel.com>
Cc: Jani Nikula <jani.nik...@intel.com>
Cc: Manasi Navare <manasi.d.nav...@intel.com>
Signed-off-by: Jouni Högander <jouni.hogan...@intel.com>
---
 .../drm/i915/display/intel_dp_aux_backlight.c   | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

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 c92d5bb2326a..b2666bd67701 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -276,8 +276,11 @@ intel_dp_aux_hdr_disable_backlight(const struct 
drm_connector_state *conn_state,
 static int
 intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe 
pipe)
 {
-       struct drm_i915_private *i915 = to_i915(connector->base.dev);
+       struct drm_connector *conn_base = &connector->base;
+       struct drm_i915_private *i915 = to_i915(conn_base->dev);
        struct intel_panel *panel = &connector->panel;
+       struct drm_luminance_range_info *luminance_range =
+               &conn_base->display_info.luminance_range;
        int ret;
 
        if (panel->backlight.edp.intel.sdr_uses_aux) {
@@ -293,8 +296,16 @@ 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 = 512;
+               panel->backlight.min = 0;
+       } else {
+               panel->backlight.max = luminance_range->max_luminance;
+               panel->backlight.min = luminance_range->min_luminance;
+       }
+
+       drm_dbg(&i915->drm, "Using 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;
 
-- 
2.25.1