Fix i915 backlight issue on gen4 (rhbz 1094066)
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Josh Boyer
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Bugzilla: 1094066
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Upstream-status: Sent for 3.16 and CC'd to stable
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From: Jani Nikula <jani.nikula@intel.com>
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To: intel-gfx@lists.freedesktop.org
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Date: Mon, 9 Jun 2014 18:24:34 +0300
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Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
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Cc: jani.nikula@intel.com, Marc Milgram <mmilgram@redhat.com>,
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Stable <stable@vger.kernel.org>, mcy@lm7.fr
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Subject: [Intel-gfx] [PATCH] drm/i915: set backlight duty cycle after
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backlight enable for gen4
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X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26
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X-Scanned-By: MIMEDefang 2.68 on 10.5.110.20
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For reasons I can't claim to fully understand gen4 seems to require
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backlight duty cycle setting after the backlight has been enabled, or
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else black screen follows. I don't have documentation for the correct
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sequence on gen4 either. Confirmed on Dell Latitude D630 and MacBook4,1.
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This fixes a regression introduced by
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commit b35684b8fa94e04f55fd38bf672b737741d2f9e2
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Author: Jani Nikula <jani.nikula@intel.com>
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Date: Thu Nov 14 12:13:41 2013 +0200
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drm/i915: do full backlight setup at enable time
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Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=75791
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Reported-and-tested-by: mcy@lm7.fr
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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79423
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Reported-and-tested-by: Marc Milgram <mmilgram@redhat.com>
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Cc: Stable <stable@vger.kernel.org> # 3.14+
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Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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---
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drivers/gpu/drm/i915/intel_panel.c | 5 ++---
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1 file changed, 2 insertions(+), 3 deletions(-)
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diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
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index 5e6c888b4928..38a98570d10c 100644
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--- a/drivers/gpu/drm/i915/intel_panel.c
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+++ b/drivers/gpu/drm/i915/intel_panel.c
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@@ -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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-
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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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+
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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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--
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1.9.1
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_______________________________________________
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Intel-gfx mailing list
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Intel-gfx@lists.freedesktop.org
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http://lists.freedesktop.org/mailman/listinfo/intel-gfx
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@ -763,6 +763,9 @@ Patch25093: auditsc-audit_krule-mask-accesses-need-bounds-checking.patch
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#rhbz 1099857
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Patch25095: team-fix-mtu-setting.patch
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#rhbz 1094066
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Patch25096: drm-i915-set-backlight-duty-cycle-after-backlight-enable-for-gen4.patch
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# END OF PATCH DEFINITIONS
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%endif
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@ -1469,6 +1472,9 @@ ApplyPatch auditsc-audit_krule-mask-accesses-need-bounds-checking.patch
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#rhbz 1099857
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ApplyPatch team-fix-mtu-setting.patch
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#rhbz 1094066
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ApplyPatch drm-i915-set-backlight-duty-cycle-after-backlight-enable-for-gen4.patch
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# END OF PATCH APPLICATIONS
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%endif
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@ -2282,6 +2288,7 @@ fi
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%changelog
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* Wed Jun 11 2014 Josh Boyer <jwboyer@fedoraproject.org>
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- Fix i915 backlight issue on gen4 (rhbz 1094066)
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- Linux v3.14.7
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* Sat Jun 07 2014 Justin M. Forbes <jforbes@fedoraproject.org> - 3.14.6-100
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