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drm/i915: panel: Add get_vbt_pwm_freq() helper

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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()).

Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200903112337.4113-15-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2020-09-03 13:23:34 +02:00
parent c86b155da7
commit 27a79cbc17
1 changed files with 17 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
drivers/gpu/drm/i915/display/intel_panel.c
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@ -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,