On Wed, 31 May 2017, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> wrote:
> Split out BXT and CNP's setup_backlight(),enable_backlight(),
> disable_backlight() and hz_to_pwm() into
> two separate functions instead of reusing BXT function.
>
> Reuse set_backlight() and get_backlight() since they have
> no reference to the utility pin.
>
> v2: Reuse BXT functions with controller 0 instead of
> redefining it. (Jani).
> Use dev_priv->rawclk_freq instead of getting the value
> from SFUSE_STRAP.
> v3: Avoid setup backligh controller along with hooks and
> fully reuse hooks setup as suggested by Jani.
> v4: Clean up commit message.
> v5: Implement per PCH instead per platform.
>
> v6: Introduce a new function for CNP.(Jani and Ville)
>
> v7: Squash the all CNP Backlight support patches into a
> single patch. (Jani)
>
> v8: Correct indentation, remove unneeded blank lines and
> correct mail address (Jani).
>
> v9: Remove unused enum pipe. (by CI)
>
> Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> Suggested-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> Suggested-by: Ville Syrjala <ville.syrjala@xxxxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_panel.c | 93 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 93 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index c8103f8..7e34a1b 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 +1292,18 @@ 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.
> + * Value is found in SFUSE_STRAP.
This is confusing because it's not taken into account in the code.
BR,
Jani.
> + * 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 +1698,37 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
> 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;
> +
> + panel->backlight.controller = dev_priv->vbt.backlight.controller;
> +
> + 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 +1845,14 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
> panel->backlight.set = bxt_set_backlight;
> panel->backlight.get = bxt_get_backlight;
> panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
> + 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;
--
Jani Nikula, Intel Open Source Technology Center
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