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drm/amdgpu/dce10: disable hpd on local panels

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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@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2016-09-28 12:41:50 -04:00
parent bdbdb571c8
commit e96ec90f49
1 changed files with 13 additions and 10 deletions
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23
drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
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@ -427,16 +427,6 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev)
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:
idx = 0;
@ -460,6 +450,19 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev)
continue;
}
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.
*/
tmp = RREG32(mmDC_HPD_INT_CONTROL + hpd_offsets[idx]);
tmp = REG_SET_FIELD(tmp, DC_HPD_INT_CONTROL, DC_HPD_INT_EN, 0);
WREG32(mmDC_HPD_INT_CONTROL + hpd_offsets[idx], tmp);
continue;
}
tmp = RREG32(mmDC_HPD_CONTROL + hpd_offsets[idx]);
tmp = REG_SET_FIELD(tmp, DC_HPD_CONTROL, DC_HPD_EN, 1);
WREG32(mmDC_HPD_CONTROL + hpd_offsets[idx], tmp);