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drm/i915/backlight: Modify function to get VESA brightness in Nits

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Modify vesa_get_brightness function to take into account
luminance_control_support and based on that read the appropriate
register and return the value.

--v2
-Changes since we now use luminance instead of nits

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Tested-by: Ben Kao <ben.kao@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250206063253.2827017-6-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2025-02-06 12:02:50 +05:30
parent 6448149792
commit 3f8a009a79
1 changed files with 20 additions and 0 deletions
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20
drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
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@ -451,6 +451,26 @@ intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pi
/* VESA backlight callbacks */
static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
struct intel_panel *panel = &connector->panel;
u8 buf[3];
u32 val = 0;
int ret;
if (panel->backlight.edp.vesa.luminance_control_support) {
ret = drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, buf,
sizeof(buf));
if (ret < 0) {
drm_err(intel_dp->aux.drm_dev,
"[CONNECTOR:%d:%s] Failed to read Luminance from DPCD\n",
connector->base.base.id, connector->base.name);
return 0;
}
val |= buf[0] | buf[1] << 8 | buf[2] << 16;
return val / 1000;
}
return connector->panel.backlight.level;
}