[Intel-gfx] [PATCH v2 2/3] drm/i915: Don't update staged config during force restore modesets

[Ander Conselvan de Oliveira]

The force restore path relies on the staged config to preserve the
configuration used before a suspend/resume cycle. The update done to it
in intel_modeset_fixup_state() would cause that information to be lost
after the first modeset, making it impossible to restore the modes for
pipes B and C.

References: https://bugs.freedesktop.org/show_bug.cgi?id=90468
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index bcf1041..ff7175b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11386,10 +11386,6 @@ static void intel_modeset_fixup_state(struct drm_atomic_state *state)
 		crtc->base.enabled = crtc->base.state->enable;
 		crtc->config = to_intel_crtc_state(crtc->base.state);
 	}
-
-	/* Copy the new configuration to the staged state, to keep the few
-	 * pieces of code that haven't been converted yet happy */
-	intel_modeset_update_staged_output_state(state->dev);
 }
 
 static void
@@ -12654,8 +12650,10 @@ static int intel_set_mode_with_config(struct drm_crtc *crtc,
 
 	ret = __intel_set_mode(crtc, pipe_config);
 
-	if (ret == 0 && force_restore)
+	if (ret == 0 && force_restore) {
+		intel_modeset_update_staged_output_state(crtc->dev);
 		intel_modeset_check_state(crtc->dev);
+	}
 
 	return ret;
 }
-- 
2.1.0