forked from Minki/linux
drm/i915: set backlight duty cycle after backlight enable for gen4
For reasons I can't claim to fully understand gen4 seems to require
backlight duty cycle setting after the backlight has been enabled, or
else black screen follows. I don't have documentation for the correct
sequence on gen4 either. Confirmed on Dell Latitude D630 and MacBook4,1.
This fixes a regression introduced by
commit b35684b8fa
Author: Jani Nikula <jani.nikula@intel.com>
Date: Thu Nov 14 12:13:41 2013 +0200
drm/i915: do full backlight setup at enable time
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=75791
Reported-and-tested-by: mcy@lm7.fr
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79423
Reported-and-tested-by: Marc Milgram <mmilgram@redhat.com>
Cc: Stable <stable@vger.kernel.org> # 3.14+
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
parent
2b85886a54
commit
2e7eeeb59a
@ -798,9 +798,6 @@ static void i965_enable_backlight(struct intel_connector *connector)
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ctl = freq << 16;
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I915_WRITE(BLC_PWM_CTL, ctl);
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/* XXX: combine this into above write? */
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intel_panel_actually_set_backlight(connector, panel->backlight.level);
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ctl2 = BLM_PIPE(pipe);
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if (panel->backlight.combination_mode)
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ctl2 |= BLM_COMBINATION_MODE;
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@ -809,6 +806,8 @@ static void i965_enable_backlight(struct intel_connector *connector)
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I915_WRITE(BLC_PWM_CTL2, ctl2);
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POSTING_READ(BLC_PWM_CTL2);
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I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
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intel_panel_actually_set_backlight(connector, panel->backlight.level);
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}
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static void vlv_enable_backlight(struct intel_connector *connector)
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