drm/i915: don't hard code vlv backlight frequency if unset
Fall back to VBT based backlight modulation frequency if it's not set. Do not hard code. This could be a problem if there is no VBT. Cc: Clint Taylor <clinton.a.taylor@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Tested-by: Clint Taylor <Clinton.A.Taylor@intel.com> Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -1532,21 +1532,8 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
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struct drm_device *dev = connector->base.dev;
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struct drm_i915_private *dev_priv = dev->dev_private;
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struct intel_panel *panel = &connector->panel;
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enum pipe p;
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u32 ctl, ctl2, val;
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for_each_pipe(dev_priv, p) {
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u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
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/* Skip if the modulation freq is already set */
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if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
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continue;
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cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
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I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
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cur_val);
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}
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if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
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return -ENODEV;
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