diff options
| -rw-r--r-- | drivers/gpu/drm/i915/intel_panel.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index c8103f8d4dfa..4114cb3f14e7 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector) } } +static void cnp_disable_backlight(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 tmp; + + intel_panel_actually_set_backlight(connector, 0); + + tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller)); + I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), + tmp & ~BXT_BLC_PWM_ENABLE); +} + static void pwm_disable_backlight(struct intel_connector *connector) { struct intel_panel *panel = &connector->panel; @@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector) pwm_ctl | BXT_BLC_PWM_ENABLE); } +static void cnp_enable_backlight(struct intel_connector *connector) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 pwm_ctl; + + pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller)); + if (pwm_ctl & BXT_BLC_PWM_ENABLE) { + DRM_DEBUG_KMS("backlight already enabled\n"); + pwm_ctl &= ~BXT_BLC_PWM_ENABLE; + I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl); + } + + I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller), + panel->backlight.max); + + intel_panel_actually_set_backlight(connector, panel->backlight.level); + + pwm_ctl = 0; + if (panel->backlight.active_low_pwm) + pwm_ctl |= BXT_BLC_PWM_POLARITY; + + I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl); + POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller)); + I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), + pwm_ctl | BXT_BLC_PWM_ENABLE); +} + static void pwm_enable_backlight(struct intel_connector *connector) { struct intel_panel *panel = &connector->panel; @@ -1250,6 +1292,17 @@ void intel_backlight_device_unregister(struct intel_connector *connector) #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */ /* + * CNP: PWM clock frequency is 19.2 MHz or 24 MHz. + * PWM increment = 1 + */ +static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + + return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz); +} + +/* * BXT: PWM clock frequency = 19.2 MHz. */ static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz) @@ -1644,6 +1697,42 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused) return 0; } +static int +cnp_setup_backlight(struct intel_connector *connector, enum pipe unused) +{ + struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_panel *panel = &connector->panel; + u32 pwm_ctl, val; + + /* + * CNP has the BXT implementation of backlight, but with only + * one controller. Future platforms could have multiple controllers + * so let's make this extensible and prepared for the future. + */ + panel->backlight.controller = 0; + + pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller)); + + panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY; + panel->backlight.max = + I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller)); + + if (!panel->backlight.max) + panel->backlight.max = get_backlight_max_vbt(connector); + + if (!panel->backlight.max) + return -ENODEV; + + val = bxt_get_backlight(connector); + val = intel_panel_compute_brightness(connector, val); + panel->backlight.level = clamp(val, panel->backlight.min, + panel->backlight.max); + + panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE; + + return 0; +} + static int pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe) { @@ -1760,6 +1849,13 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel) panel->backlight.set = bxt_set_backlight; panel->backlight.get = bxt_get_backlight; panel->backlight.hz_to_pwm = bxt_hz_to_pwm; + } else if (HAS_PCH_CNP(dev_priv)) { + panel->backlight.setup = cnp_setup_backlight; + panel->backlight.enable = cnp_enable_backlight; + panel->backlight.disable = cnp_disable_backlight; + panel->backlight.set = bxt_set_backlight; + panel->backlight.get = bxt_get_backlight; + panel->backlight.hz_to_pwm = cnp_hz_to_pwm; } else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv)) { panel->backlight.setup = lpt_setup_backlight; |