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drm/i915: fix backlight invert for non-zero minimum brightness 

When we started following the backlight minimum brightness in
6dda730e55 ("drm/i915: respect the VBT minimum backlight brightness")
we overlooked the brightness invert quirk. Even if we invert the
brightness, we need to take the min limit into account. We probably
missed this because the invert has only been required on gen4 for proper
operation.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101127
Fixes: 6dda730e55 ("drm/i915: respect the VBT minimum backlight brightness")
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170531083355.7898-1-jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2017-05-31 11:33:55 +03:00
parent 6cb0c6ad9e
commit e9d7486eac
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_panel.c
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@ -470,7 +470,7 @@ static u32 intel_panel_compute_brightness(struct intel_connector *connector,
if (i915.invert_brightness > 0 ||
dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
return panel->backlight.max - val;
return panel->backlight.max - val + panel->backlight.min;
}
return val;