On Fri, 2013-11-08 at 16:49 +0200, Jani Nikula wrote:
> Prepare for being able to use the information at enable.
>
> Signed-off-by: Jani Nikula <jani.nik...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_panel.c | 68
> +++++++++++++++++++++++++++++-------
> 2 files changed, 58 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 7384a7b..6f2bc82 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -163,6 +163,8 @@ struct intel_panel {
> u32 level;
> u32 max;
> bool enabled;
> + bool combination_mode; /* gen 2/4 only */
> + bool active_low_pwm;
> struct backlight_device *device;
> } backlight;
> };
> diff --git a/drivers/gpu/drm/i915/intel_panel.c
> b/drivers/gpu/drm/i915/intel_panel.c
> index 3dd9f57d..0e8f0a3 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -490,13 +490,14 @@ static u32 i9xx_get_backlight(struct intel_connector
> *connector)
> {
> struct drm_device *dev = connector->base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_panel *panel = &connector->panel;
> u32 val;
>
> val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
> if (INTEL_INFO(dev)->gen < 4)
> val >>= 1;
>
> - if (is_backlight_combination_mode(dev)) {
> + if (panel->backlight.combination_mode) {
> u8 lbpc;
>
> pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
> @@ -558,7 +559,7 @@ static void i9xx_set_backlight(struct intel_connector
> *connector, u32 level)
>
> WARN_ON(panel->backlight.max == 0);
>
> - if (is_backlight_combination_mode(dev)) {
> + if (panel->backlight.combination_mode) {
> u8 lbpc;
>
> lbpc = level * 0xfe / panel->backlight.max + 1;
> @@ -966,46 +967,84 @@ static void intel_backlight_device_unregister(struct
> intel_connector *connector)
> */
> static int pch_setup_backlight(struct intel_connector *connector)
> {
> + struct drm_device *dev = connector->base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_panel *panel = &connector->panel;
> - u32 val;
> + u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
>
> - panel->backlight.max = pch_get_max_backlight(connector);
> + pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
> + panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
> +
> + pch_ctl2 = I915_READ(BLC_PWM_PCH_CTL2);
> + panel->backlight.max = pch_ctl2 >> 16;
> if (!panel->backlight.max)
> return -ENODEV;
>
> val = pch_get_backlight(connector);
> panel->backlight.level = intel_panel_compute_brightness(connector, val);
>
> + cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
> + panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
> + (pch_ctl1 & BLM_PCH_PWM_ENABLE) && panel->backlight.level != 0;
Don't we need to check here for QUIRK_NO_PCH_PWM_ENABLE?
--Imre
> +
> return 0;
> }
>
> static int i9xx_setup_backlight(struct intel_connector *connector)
> {
> + struct drm_device *dev = connector->base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_panel *panel = &connector->panel;
> - u32 val;
> + u32 ctl, val;
> +
> + ctl = I915_READ(BLC_PWM_CTL);
> +
> + if (IS_GEN2(dev))
> + panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
> +
> + if (IS_PINEVIEW(dev))
> + panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
> +
> + panel->backlight.max = ctl >> 17;
> + if (panel->backlight.combination_mode)
> + panel->backlight.max *= 0xff;
>
> - panel->backlight.max = i9xx_get_max_backlight(connector);
> if (!panel->backlight.max)
> return -ENODEV;
>
> val = i9xx_get_backlight(connector);
> panel->backlight.level = intel_panel_compute_brightness(connector, val);
>
> + panel->backlight.enabled = panel->backlight.level != 0;
> +
> return 0;
> }
>
> static int i965_setup_backlight(struct intel_connector *connector)
> {
> + struct drm_device *dev = connector->base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_panel *panel = &connector->panel;
> - u32 val;
> + u32 ctl, ctl2, val;
> +
> + ctl2 = I915_READ(BLC_PWM_CTL2);
> + panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
> + panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
> +
> + ctl = I915_READ(BLC_PWM_CTL);
> + panel->backlight.max = ctl >> 16;
> + if (panel->backlight.combination_mode)
> + panel->backlight.max *= 0xff;
>
> - panel->backlight.max = i965_get_max_backlight(connector);
> if (!panel->backlight.max)
> return -ENODEV;
>
> val = i9xx_get_backlight(connector);
> panel->backlight.level = intel_panel_compute_brightness(connector, val);
>
> + panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
> + panel->backlight.level != 0;
> +
> return 0;
> }
>
> @@ -1015,7 +1054,7 @@ static int vlv_setup_backlight(struct intel_connector
> *connector)
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_panel *panel = &connector->panel;
> enum pipe pipe;
> - u32 val;
> + u32 ctl, ctl2, val;
>
> for_each_pipe(pipe) {
> u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(pipe));
> @@ -1029,13 +1068,20 @@ static int vlv_setup_backlight(struct intel_connector
> *connector)
> cur_val);
> }
>
> - panel->backlight.max = _vlv_get_max_backlight(dev, PIPE_A);
> + ctl2 = I915_READ(VLV_BLC_PWM_CTL2(PIPE_A));
> + panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
> +
> + ctl = I915_READ(VLV_BLC_PWM_CTL(PIPE_A));
> + panel->backlight.max = ctl >> 16;
> if (!panel->backlight.max)
> return -ENODEV;
>
> val = _vlv_get_backlight(dev, PIPE_A);
> panel->backlight.level = intel_panel_compute_brightness(connector, val);
>
> + panel->backlight.enabled = (ctl2 & BLM_PWM_ENABLE) &&
> + panel->backlight.level != 0;
> +
> return 0;
> }
>
> @@ -1059,8 +1105,6 @@ int intel_panel_setup_backlight(struct drm_connector
> *connector)
> return ret;
> }
>
> - panel->backlight.enabled = panel->backlight.level != 0;
> -
> intel_backlight_device_register(intel_connector);
>
> panel->backlight.present = true;
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