[CI 06/17] drm/i915: Track whether an atomic transaction changes the active CRTC's

Matt Roper
2016-05-12T14:06:34Z

For the purposes of DDB re-allocation we need to know whether a
transaction changes the list of CRTC's that are active. While
state->modeset could be used for this purpose, that would be slightly
too aggressive since it would lead us to re-allocate the DDB when a
CRTC's mode changes, but not its final active state.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 3 +++
drivers/gpu/drm/i915/intel_drv.h | 10 ++++++++++
2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b60d9b6..d680fb3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13271,6 +13271,9 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
intel_state->active_crtcs |= 1 << i;
else
intel_state->active_crtcs &= ~(1 << i);
+
+ if (crtc_state->active != crtc->state->active)
+ intel_state->active_pipe_changes |= drm_crtc_mask(crtc);
}

/*
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4313019..69b4119 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -291,6 +291,16 @@ struct intel_atomic_state {

bool dpll_set, modeset;

+ /*
+ * Does this transaction change the pipes that are active? This mask
+ * tracks which CRTC's have changed their active state at the end of
+ * the transaction (not counting the temporary disable during modesets).
+ * This mask should only be non-zero when intel_state->modeset is true,
+ * but the converse is not necessarily true; simply changing a mode may
+ * not flip the final active status of any CRTC's
+ */
+ unsigned int active_pipe_changes;
+
unsigned int active_crtcs;
unsigned int min_pixclk[I915_MAX_PIPES];