[ 3.5.y.z extended stable ] Patch "drm/radeon/evergreen+: don't enable HPD interrupts on" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Wed May 15 10:33:23 UTC 2013
This is a note to let you know that I have just added a patch titled
drm/radeon/evergreen+: don't enable HPD interrupts on
to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 5768bac53d552740bda56b34369e042e956314b6 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher at amd.com>
Date: Thu, 11 Apr 2013 12:45:34 -0400
Subject: [PATCH] drm/radeon/evergreen+: don't enable HPD interrupts on
eDP/LVDS
commit 2e97be73e5f74a317232740ae82eb8f95326a660 upstream.
Avoids potential interrupt storms when the display is disabled.
May fix:
https://bugzilla.kernel.org/show_bug.cgi?id=56041
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
drivers/gpu/drm/radeon/evergreen.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index ccac010..9cf8f35 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -445,6 +445,16 @@ void evergreen_hpd_init(struct radeon_device *rdev)
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
struct radeon_connector *radeon_connector = to_radeon_connector(connector);
+
+ if (connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
+ connector->connector_type == DRM_MODE_CONNECTOR_LVDS) {
+ /* don't try to enable hpd on eDP or LVDS avoid breaking the
+ * aux dp channel on imac and help (but not completely fix)
+ * https://bugzilla.redhat.com/show_bug.cgi?id=726143
+ * also avoid interrupt storms during dpms.
+ */
+ continue;
+ }
switch (radeon_connector->hpd.hpd) {
case RADEON_HPD_1:
WREG32(DC_HPD1_CONTROL, tmp);
--
1.8.1.2
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