linux-kernel - [128/152] drm/radeon/kms/evergreen: reset the grbm blocks at resume and init

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Message-Id: <20110106002308.793364768@clark.site>
Date:	Wed, 05 Jan 2011 16:23:47 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Alex Deucher <alexdeucher@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [128/152] drm/radeon/kms/evergreen: reset the grbm blocks at resume and init

2.6.36-stable review patch.  If anyone has any objections, please let us know.

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

From: Alex Deucher <alexdeucher@...il.com>

commit 86f5c9edbb3bac37cc8cee6528a929005ba72aad upstream.

This fixes module reloading and resume as the gfx block seems to
be left in a bad state in some cases.

Signed-off-by: Alex Deucher <alexdeucher@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/evergreen.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -2097,6 +2097,11 @@ int evergreen_resume(struct radeon_devic
 {
 	int r;
 
+	/* reset the asic, the gfx blocks are often in a bad state
+	 * after the driver is unloaded or after a resume
+	 */
+	if (radeon_asic_reset(rdev))
+		dev_warn(rdev->dev, "GPU reset failed !\n");
 	/* Do not reset GPU before posting, on rv770 hw unlike on r500 hw,
 	 * posting will perform necessary task to bring back GPU into good
 	 * shape.
@@ -2193,6 +2198,11 @@ int evergreen_init(struct radeon_device
 	r = radeon_atombios_init(rdev);
 	if (r)
 		return r;
+	/* reset the asic, the gfx blocks are often in a bad state
+	 * after the driver is unloaded or after a resume
+	 */
+	if (radeon_asic_reset(rdev))
+		dev_warn(rdev->dev, "GPU reset failed !\n");
 	/* Post card if necessary */
 	if (!evergreen_card_posted(rdev)) {
 		if (!rdev->bios) {


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