Luminance range was split out into drm_edid.c to share the calculation
function. Use this new interface for caps->aux_max_input_signal and
caps->aux_min_input_signal.
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Mika Kahola <mika.kahola@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 35 +++----------------
1 file changed, 4 insertions(+), 31 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 2ade82cfb1ac..49c03400e962 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2836,15 +2836,11 @@ static struct drm_mode_config_helper_funcs amdgpu_dm_mode_config_helperfuncs = {
static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
{
- u32 max_cll, min_cll, max, min, q, r;
struct amdgpu_dm_backlight_caps *caps;
struct amdgpu_display_manager *dm;
struct drm_connector *conn_base;
struct amdgpu_device *adev;
struct dc_link *link = NULL;
- static const u8 pre_computed_values[] = {
- 50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 68, 69,
- 71, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98};
int i;
if (!aconnector || !aconnector->dc_link)
@@ -2866,8 +2862,6 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
caps = &dm->backlight_caps[i];
caps->ext_caps = &aconnector->dc_link->dpcd_sink_ext_caps;
caps->aux_support = false;
- max_cll = conn_base->hdr_sink_metadata.hdmi_type1.max_cll;
- min_cll = conn_base->hdr_sink_metadata.hdmi_type1.min_cll;
if (caps->ext_caps->bits.oled == 1 /*||
caps->ext_caps->bits.sdr_aux_backlight_control == 1 ||
@@ -2879,31 +2873,10 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
else if (amdgpu_backlight == 1)
caps->aux_support = true;
- /* From the specification (CTA-861-G), for calculating the maximum
- * luminance we need to use:
- * Luminance = 50*2**(CV/32)
- * Where CV is a one-byte value.
- * For calculating this expression we may need float point precision;
- * to avoid this complexity level, we take advantage that CV is divided
- * by a constant. From the Euclids division algorithm, we know that CV
- * can be written as: CV = 32*q + r. Next, we replace CV in the
- * Luminance expression and get 50*(2**q)*(2**(r/32)), hence we just
- * need to pre-compute the value of r/32. For pre-computing the values
- * We just used the following Ruby line:
- * (0...32).each {|cv| puts (50*2**(cv/32.0)).round}
- * The results of the above expressions can be verified at
- * pre_computed_values.
- */
- q = max_cll >> 5;
- r = max_cll % 32;
- max = (1 << q) * pre_computed_values[r];
-
- // min luminance: maxLum * (CV/255)^2 / 100
- q = DIV_ROUND_CLOSEST(min_cll, 255);
- min = max * DIV_ROUND_CLOSEST((q * q), 100);
-
- caps->aux_max_input_signal = max;
- caps->aux_min_input_signal = min;
+ if (!drm_luminance_range_from_static_hdr_metadata(conn_base,
+ &caps->aux_min_input_signal,
+ &caps->aux_max_input_signal))
+ DRM_ERROR("No backligt range in static hdr metadata\n");
}
void amdgpu_dm_update_connector_after_detect(
--
2.25.1
