[PATCH v3 12/15] drm/i915: panel: Add get_vbt_pwm_freq() helper

Hans de Goede
2020-06-20T12:19:23Z

Factor the code which checks and drm_dbg_kms-s the VBT PWM frequency
out of get_backlight_max_vbt().

This is a preparation patch for honering the VBT PWM frequency for
devices which use an external PWM controller (devices using
pwm_setup_backlight()).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/gpu/drm/i915/display/intel_panel.c | 27 ++++++++++++++--------
1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
index 3c5056dbf607..8efdd9f08a08 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -1543,18 +1543,9 @@ static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
}

-static u32 get_backlight_max_vbt(struct intel_connector *connector)
+static u16 get_vbt_pwm_freq(struct drm_i915_private *dev_priv)
{
- struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
- struct intel_panel *panel = &connector->panel;
u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
- u32 pwm;
-
- if (!panel->backlight.hz_to_pwm) {
- drm_dbg_kms(&dev_priv->drm,
- "backlight frequency conversion not supported\n");
- return 0;
- }

if (pwm_freq_hz) {
drm_dbg_kms(&dev_priv->drm,
@@ -1567,6 +1558,22 @@ static u32 get_backlight_max_vbt(struct intel_connector *connector)
pwm_freq_hz);
}

+ return pwm_freq_hz;
+}
+
+static u32 get_backlight_max_vbt(struct intel_connector *connector)
+{
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+ struct intel_panel *panel = &connector->panel;
+ u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
+ u32 pwm;
+
+ if (!panel->backlight.hz_to_pwm) {
+ drm_dbg_kms(&dev_priv->drm,
+ "backlight frequency conversion not supported\n");
+ return 0;
+ }
+
pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
if (!pwm) {
drm_dbg_kms(&dev_priv->drm,
--
2.26.2