[PATCH 4.18 156/171] drm/i915: Restore vblank interrupts earlier

Greg Kroah-Hartman
2018-11-19T16:46:48Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

commit 7cada4d0b7a0fb813dbc9777fec092e9ed0546e9 upstream.

Plane sanitation needs vblank interrupts (on account of CxSR disable).
So let's restore vblank interrupts earlier.

v2: Make it actually build
v3: Add comment to explain why we need this (Daniel)

Cc: stable@vger.kernel.org
Cc: Dennis <dennis.nezic@utoronto.ca>
Tested-by: Dennis <dennis.nezic@utoronto.ca>
Tested-by: Peter Nowee <peter.nowee@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105637
Fixes: b1e01595a66d ("drm/i915: Redo plane sanitation during readout")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20181003144951.4397-1-ville.syrjala@linux.intel.com
(cherry picked from commit 68bc30deac625b8be8d3950b30dc93d09a3645f5)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/i915/intel_display.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)

--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -15216,13 +15216,9 @@ static void intel_sanitize_crtc(struct i
I915_READ(reg) & ~PIPECONF_FRAME_START_DELAY_MASK);
}

- /* restore vblank interrupts to correct state */
- drm_crtc_vblank_reset(&crtc->base);
if (crtc->active) {
struct intel_plane *plane;

- drm_crtc_vblank_on(&crtc->base);
-
/* Disable everything but the primary plane */
for_each_intel_plane_on_crtc(dev, crtc, plane) {
const struct intel_plane_state *plane_state =
@@ -15549,7 +15545,6 @@ intel_modeset_setup_hw_state(struct drm_
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_i915_private *dev_priv = to_i915(dev);
- enum pipe pipe;
struct intel_crtc *crtc;
struct intel_encoder *encoder;
int i;
@@ -15560,15 +15555,23 @@ intel_modeset_setup_hw_state(struct drm_
/* HW state is read out, now we need to sanitize this mess. */
get_encoder_power_domains(dev_priv);

- intel_sanitize_plane_mapping(dev_priv);
+ /*
+ * intel_sanitize_plane_mapping() may need to do vblank
+ * waits, so we need vblank interrupts restored beforehand.
+ */
+ for_each_intel_crtc(&dev_priv->drm, crtc) {
+ drm_crtc_vblank_reset(&crtc->base);

- for_each_intel_encoder(dev, encoder) {
- intel_sanitize_encoder(encoder);
+ if (crtc->active)
+ drm_crtc_vblank_on(&crtc->base);
}

- for_each_pipe(dev_priv, pipe) {
- crtc = intel_get_crtc_for_pipe(dev_priv, pipe);
+ intel_sanitize_plane_mapping(dev_priv);
+
+ for_each_intel_encoder(dev, encoder)
+ intel_sanitize_encoder(encoder);

+ for_each_intel_crtc(&dev_priv->drm, crtc) {
intel_sanitize_crtc(crtc, ctx);
intel_dump_pipe_config(crtc, crtc->config,
"[setup_hw_state]");