linux-kernel - [PATCH] Revert "drm/i915: fix vblank wait test condition"

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Date:	Sat,  4 Sep 2010 11:17:14 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: [PATCH] Revert "drm/i915: fix vblank wait test condition"

This reverts commit 9559fcdbff4f93d29af04478bbc48294519424f5. The commit causes
wrong screen resolution on some i915 machines such as MacBook which is a
regression from 2.6.35. The issue has been reported multiple times but no fix
has emerged:

  - i915: 2.6.36-rc2 wrong resolution on gdm start:
    http://lkml.org/lkml/2010/8/23/452

  - i915: wrong framebuffer size in 2.6.36-rc3
    http://kerneltrap.org/mailarchive/linux-kernel/2010/8/30/4613057

I think it's time to revert the commit and try again in 2.6.37.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Sitsofe Wheeler <sitsofe@...oo.com>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
Reported-by Ivan Bulatovic <combuster@....com>
Reported-by: Pekka Enberg <penberg@...nel.org>
Signed-off-by: Pekka Enberg <penberg@...nel.org>
---
 drivers/gpu/drm/i915/intel_display.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 11a3394..23157e1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -992,7 +992,7 @@ void intel_wait_for_vblank(struct drm_device *dev, int pipe)
 
 	/* Wait for vblank interrupt bit to set */
 	if (wait_for((I915_READ(pipestat_reg) &
-		      PIPE_VBLANK_INTERRUPT_STATUS),
+		      PIPE_VBLANK_INTERRUPT_STATUS) == 0,
 		     50, 0))
 		DRM_DEBUG_KMS("vblank wait timed out\n");
 }
-- 
1.6.3.3

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