This is a note to let you know that I've just added the patch titled
drm/amdgpu/dce8: disable hpd on local panels
to the 4.4-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-amdgpu-dce8-disable-hpd-on-local-panels.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 324082586cc5918e3230f0b2f326656c653201eb Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Wed, 28 Sep 2016 12:44:20 -0400
Subject: drm/amdgpu/dce8: disable hpd on local panels
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 324082586cc5918e3230f0b2f326656c653201eb upstream.
Otherwise we can get a hotplug interrupt storm when
we turn the panel off if hpd interrupts were enabled
by the bios.
bug:
https://bugs.freedesktop.org/show_bug.cgi?id=97471
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | 48 +++++++++++++++++++++++++++-------
1 file changed, 39 insertions(+), 9 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
@@ -392,15 +392,6 @@ static void dce_v8_0_hpd_init(struct amd
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
struct amdgpu_connector *amdgpu_connector = to_amdgpu_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 (amdgpu_connector->hpd.hpd) {
case AMDGPU_HPD_1:
WREG32(mmDC_HPD1_CONTROL, tmp);
@@ -423,6 +414,45 @@ static void dce_v8_0_hpd_init(struct amd
default:
break;
}
+
+ 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.
+ */
+ u32 dc_hpd_int_cntl_reg, dc_hpd_int_cntl;
+
+ switch (amdgpu_connector->hpd.hpd) {
+ case AMDGPU_HPD_1:
+ dc_hpd_int_cntl_reg = mmDC_HPD1_INT_CONTROL;
+ break;
+ case AMDGPU_HPD_2:
+ dc_hpd_int_cntl_reg = mmDC_HPD2_INT_CONTROL;
+ break;
+ case AMDGPU_HPD_3:
+ dc_hpd_int_cntl_reg = mmDC_HPD3_INT_CONTROL;
+ break;
+ case AMDGPU_HPD_4:
+ dc_hpd_int_cntl_reg = mmDC_HPD4_INT_CONTROL;
+ break;
+ case AMDGPU_HPD_5:
+ dc_hpd_int_cntl_reg = mmDC_HPD5_INT_CONTROL;
+ break;
+ case AMDGPU_HPD_6:
+ dc_hpd_int_cntl_reg = mmDC_HPD6_INT_CONTROL;
+ break;
+ default:
+ continue;
+ }
+
+ dc_hpd_int_cntl = RREG32(dc_hpd_int_cntl_reg);
+ dc_hpd_int_cntl &= ~DC_HPD1_INT_CONTROL__DC_HPD1_INT_EN_MASK;
+ WREG32(dc_hpd_int_cntl_reg, dc_hpd_int_cntl);
+ continue;
+ }
+
dce_v8_0_hpd_set_polarity(adev, amdgpu_connector->hpd.hpd);
amdgpu_irq_get(adev, &adev->hpd_irq, amdgpu_connector->hpd.hpd);
}
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-4.4/drm-amdgpu-dce11-add-missing-drm_mode_config_cleanup-call.patch
queue-4.4/drm-radeon-si-dpm-fix-phase-shedding-setup.patch
queue-4.4/drm-amdgpu-dce11-disable-hpd-on-local-panels.patch
queue-4.4/drm-amdgpu-dce8-disable-hpd-on-local-panels.patch
queue-4.4/drm-amdgpu-dce10-disable-hpd-on-local-panels.patch
queue-4.4/drm-amdgpu-fix-ib-alignment-for-uvd.patch
queue-4.4/drm-amdgpu-change-vblank_time-s-calculation-method-to-reduce-computational-error.patch
queue-4.4/drm-radeon-narrow-asic_init-for-virtualization.patch
queue-4.4/drm-radeon-change-vblank_time-s-calculation-method-to-reduce-computational-error.patch
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