drm/amdgpu/dce8: Re-set VBLANK interrupt state when enabling a CRTC
Something (ATOM BIOS?) seems to be clobbering the LB_INTERRUPT_MASK register while the CRTC is off, which caused e.g. glxgears or gnome-shell to hang after a modeset. Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
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@ -2566,6 +2566,7 @@ static void dce_v8_0_crtc_dpms(struct drm_crtc *crtc, int mode)
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struct drm_device *dev = crtc->dev;
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struct amdgpu_device *adev = dev->dev_private;
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struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
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unsigned type;
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switch (mode) {
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case DRM_MODE_DPMS_ON:
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@ -2574,6 +2575,9 @@ static void dce_v8_0_crtc_dpms(struct drm_crtc *crtc, int mode)
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dce_v8_0_vga_enable(crtc, true);
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amdgpu_atombios_crtc_blank(crtc, ATOM_DISABLE);
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dce_v8_0_vga_enable(crtc, false);
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/* Make sure VBLANK interrupt is still enabled */
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type = amdgpu_crtc_idx_to_irq_type(adev, amdgpu_crtc->crtc_id);
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amdgpu_irq_update(adev, &adev->crtc_irq, type);
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drm_vblank_post_modeset(dev, amdgpu_crtc->crtc_id);
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dce_v8_0_crtc_load_lut(crtc);
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break;
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