static u32 pwm_get_backlight(struct intel_connector *connector)
{
struct intel_panel *panel = &connector->panel;
- int duty_ns;
+ struct pwm_state state;
- duty_ns = pwm_get_duty_cycle(panel->backlight.pwm);
- return DIV_ROUND_UP(duty_ns * 100, panel->backlight.pwm_period_ns);
+ pwm_get_state(panel->backlight.pwm, &state);
+ return pwm_get_relative_duty_cycle(&state, 100);
}
static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
- int duty_ns = DIV_ROUND_UP(level * panel->backlight.pwm_period_ns, 100);
- pwm_config(panel->backlight.pwm, duty_ns,
- panel->backlight.pwm_period_ns);
+ pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
+ pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
}
static void
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct intel_panel *panel = &connector->panel;
- /* Disable the backlight */
- intel_panel_actually_set_backlight(old_conn_state, 0);
- usleep_range(2000, 3000);
- pwm_disable(panel->backlight.pwm);
+ panel->backlight.pwm_state.enabled = false;
+ pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
}
void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_state)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
+ int level = panel->backlight.level;
- pwm_enable(panel->backlight.pwm);
- intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
+ level = intel_panel_compute_brightness(connector, level);
+ pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
+ panel->backlight.pwm_state.enabled = true;
+ pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
}
static void __intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_panel *panel = &connector->panel;
const char *desc;
- u32 level, ns;
- int retval;
+ u32 level;
/* Get the right PWM chip for DSI backlight according to VBT */
if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
return -ENODEV;
}
- panel->backlight.pwm_period_ns = NSEC_PER_SEC /
- get_vbt_pwm_freq(dev_priv);
-
- /*
- * FIXME: pwm_apply_args() should be removed when switching to
- * the atomic PWM API.
- */
- pwm_apply_args(panel->backlight.pwm);
-
panel->backlight.max = 100; /* 100% */
panel->backlight.min = get_backlight_min_vbt(connector);
- level = intel_panel_compute_brightness(connector, 100);
- ns = DIV_ROUND_UP(level * panel->backlight.pwm_period_ns, 100);
- retval = pwm_config(panel->backlight.pwm, ns,
- panel->backlight.pwm_period_ns);
- if (retval < 0) {
- drm_err(&dev_priv->drm, "Failed to configure the pwm chip\n");
- pwm_put(panel->backlight.pwm);
- panel->backlight.pwm = NULL;
- return retval;
- }
+ if (pwm_is_enabled(panel->backlight.pwm)) {
+ /* PWM is already enabled, use existing settings */
+ pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
- level = DIV_ROUND_UP(pwm_get_duty_cycle(panel->backlight.pwm) * 100,
- panel->backlight.pwm_period_ns);
- level = intel_panel_compute_brightness(connector, level);
- panel->backlight.level = clamp(level, panel->backlight.min,
- panel->backlight.max);
- panel->backlight.enabled = panel->backlight.level != 0;
+ level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
+ 100);
+ level = intel_panel_compute_brightness(connector, level);
+ panel->backlight.level = clamp(level, panel->backlight.min,
+ panel->backlight.max);
+ panel->backlight.enabled = true;
+
+ drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
+ NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
+ get_vbt_pwm_freq(dev_priv), level);
+ } else {
+ /* Set period from VBT frequency, leave other settings at 0. */
+ panel->backlight.pwm_state.period =
+ NSEC_PER_SEC / get_vbt_pwm_freq(dev_priv);
+ }
drm_info(&dev_priv->drm, "Using %s PWM for LCD backlight control\n",
desc);