linux-kernel - [PATCH 8/9] drm_fb_helper: Preserve capability to use atomic kms

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Message-Id: <1281019198-6777-9-git-send-email-jason.wessel@windriver.com>
Date:	Thu,  5 Aug 2010 09:39:57 -0500
From:	Jason Wessel <jason.wessel@...driver.com>
To:	torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	Jason Wessel <jason.wessel@...driver.com>,
	David Airlie <airlied@...ux.ie>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Clemens Ladisch <clemens@...isch.de>
Subject: [PATCH 8/9] drm_fb_helper: Preserve capability to use atomic kms

Commit 5349ef3127c77075ff70b2014f17ae0fbcaaf199 (drm/fb: fix
FBIOGET/PUT_VSCREENINFO pixel clock handling) changed the logic of
when a pixclock was valid vs invalid.

The atomic kernel mode setting used by the kernel debugger relies upon
the drm_fb_helper_check_var() to always return -EINVAL.  Until a
better solution exists, this behavior will be restored.

CC: David Airlie <airlied@...ux.ie>
CC: Jesse Barnes <jbarnes@...tuousgeek.org>
CC: Clemens Ladisch <clemens@...isch.de>
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
---
 drivers/gpu/drm/drm_fb_helper.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 6245add..de82e20 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -685,7 +685,7 @@ int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 	struct drm_framebuffer *fb = fb_helper->fb;
 	int depth;
 
-	if (var->pixclock != 0)
+	if (var->pixclock != 0 || in_dbg_master())
 		return -EINVAL;
 
 	/* Need to resize the fb object !!! */
-- 
1.6.4.rc1

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