linux-kernel - [ 81/82] drm/i915/dp: Flush any outstanding work to turn the VDD off

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Date:	Thu, 07 Jun 2012 13:04:57 +0900
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Chris Wilson <chris@...is-wilson.co.uk>,
	Keith Packard <keithp@...thp.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 81/82] drm/i915/dp: Flush any outstanding work to turn the VDD off

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Wilson <chris@...is-wilson.co.uk>

commit 17038de5f16569a25343cf68668f3b657eafb00e upstream.

As we may kick off a delayed workqueue task to switch of the VDD lines, we
need to complete that task prior to turning off the panel (which itself
depends upon VDD being off).

v2: Don't cancel the outstanding work as this may trigger a deadlock

Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Keith Packard <keithp@...thp.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/intel_dp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1149,6 +1149,7 @@ static void ironlake_edp_panel_off(struc
 	DRM_DEBUG_KMS("Turn eDP power off\n");
 
 	WARN(intel_dp->want_panel_vdd, "Cannot turn power off while VDD is on\n");
+	ironlake_panel_vdd_off_sync(intel_dp); /* finish any pending work */
 
 	pp = ironlake_get_pp_control(dev_priv);
 	pp &= ~(POWER_TARGET_ON | EDP_FORCE_VDD | PANEL_POWER_RESET | EDP_BLC_ENABLE);


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