This is a note to let you know that I've just added the patch titled
drm/radeon/evergreen+: don't enable HPD interrupts on eDP/LVDS
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-evergreen-don-t-enable-hpd-interrupts-on-edp-lvds.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2e97be73e5f74a317232740ae82eb8f95326a660 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 11 Apr 2013 12:45:34 -0400
Subject: drm/radeon/evergreen+: don't enable HPD interrupts on eDP/LVDS
From: Alex Deucher <alexander.deucher@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -330,6 +330,16 @@ void evergreen_hpd_init(struct radeon_de
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);
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-3.0/drm-radeon-fix-possible-segfault-when-parsing-pm-tables.patch
queue-3.0/drm-radeon-fix-endian-bugs-in-atom_allocate_fb_scratch.patch
queue-3.0/drm-radeon-don-t-use-get_engine_clock-on-apus.patch
queue-3.0/drm-radeon-evergreen-don-t-enable-hpd-interrupts-on-edp-lvds.patch
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