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drm/i915/backlight: Add function to change brightness in nits for VESA

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Create a function that fills in the value for
PANEL_TARGET_LUMINANCE_VALUE which helps in changing the luminance in
nits using VESA interface.

--v2
-Prefer using luminance over nits [Jani]

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/20250206063253.2827017-7-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2025-02-06 12:02:51 +05:30
parent 3f8a009a79
commit b68074efcf
1 changed files with 30 additions and 0 deletions
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30
drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
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@ -474,6 +474,31 @@ static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, en
return connector->panel.backlight.level;
}
static int
intel_dp_aux_vesa_set_luminance(struct intel_connector *connector, u32 level)
{
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
u8 buf[3];
int ret;
level = level * 1000;
level &= 0xffffff;
buf[0] = (level & 0x0000ff);
buf[1] = (level & 0x00ff00) >> 8;
buf[2] = (level & 0xff0000) >> 16;
ret = drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE,
buf, sizeof(buf));
if (ret != sizeof(buf)) {
drm_err(intel_dp->aux.drm_dev,
"%s: Failed to set VESA Aux Luminance: %d\n",
intel_dp->aux.name, ret);
return -EINVAL;
} else {
return 0;
}
}
static void
intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
@ -481,6 +506,11 @@ intel_dp_aux_vesa_set_backlight(const struct drm_connector_state *conn_state, u3
struct intel_panel *panel = &connector->panel;
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
if (panel->backlight.edp.vesa.luminance_control_support) {
if (!intel_dp_aux_vesa_set_luminance(connector, level))
return;
}
if (!panel->backlight.edp.vesa.info.aux_set) {
const u32 pwm_level = intel_backlight_level_to_pwm(connector, level);