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drm/i915: use backlight legacy combination mode also for i915gm/i945gm
i915gm and i945gm also seem to use and need the legacy combination mode bit in BLC_PWM_CTL. v2: Also do this for i915gm (Ville). Reported-and-tested-by: Luis Ortega <luiorpe1@gmail.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=75001 Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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@ -698,7 +698,7 @@ static void i9xx_enable_backlight(struct intel_connector *connector)
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freq /= 0xff;
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ctl = freq << 17;
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if (IS_GEN2(dev) && panel->backlight.combination_mode)
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if (panel->backlight.combination_mode)
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ctl |= BLM_LEGACY_MODE;
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if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
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ctl |= BLM_POLARITY_PNV;
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@ -979,7 +979,7 @@ static int i9xx_setup_backlight(struct intel_connector *connector)
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ctl = I915_READ(BLC_PWM_CTL);
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if (IS_GEN2(dev))
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if (IS_GEN2(dev) || IS_I915GM(dev) || IS_I945GM(dev))
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panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
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if (IS_PINEVIEW(dev))
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