[Intel-gfx] [PATCH v2 05/16] drm/i915/gen9: Store plane minimum blocks in CRTC wm state

[Matt Roper]

This will eventually allow us to re-use old values without
re-calculating them for unchanged planes (which also helps us avoid
re-grabbing extra plane states).

Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h | 4 ++++
 drivers/gpu/drm/i915/intel_pm.c  | 6 ++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e67438f..56f4cf8 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -430,6 +430,10 @@ struct intel_crtc_wm_state {
 			/* cached plane data rate */
 			unsigned plane_data_rate[I915_MAX_PLANES];
 			unsigned plane_y_data_rate[I915_MAX_PLANES];
+
+			/* minimum block allocation */
+			uint16_t minimum_blocks[I915_MAX_PLANES];
+			uint16_t minimum_y_blocks[I915_MAX_PLANES];
 		} skl;
 	};
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 39ab1cb..479a890 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3067,8 +3067,8 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	enum pipe pipe = intel_crtc->pipe;
 	struct skl_ddb_entry *alloc = &ddb->pipe[pipe];
 	uint16_t alloc_size, start, cursor_blocks;
-	uint16_t minimum[I915_MAX_PLANES];
-	uint16_t y_minimum[I915_MAX_PLANES];
+	uint16_t *minimum = cstate->wm.skl.minimum_blocks;
+	uint16_t *y_minimum = cstate->wm.skl.minimum_y_blocks;
 	unsigned int total_data_rate;
 
 	skl_ddb_get_pipe_allocation_limits(dev, cstate, config, alloc);
@@ -3088,6 +3088,8 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	alloc->end -= cursor_blocks;
 
 	/* 1. Allocate the mininum required blocks for each active plane */
+	memset(minimum, 0, sizeof(uint16_t) * I915_MAX_PLANES);
+	memset(y_minimum, 0, sizeof(uint16_t) * I915_MAX_PLANES);
 	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
 		struct drm_plane *plane = &intel_plane->base;
 		struct drm_framebuffer *fb = plane->state->fb;
-- 
2.1.4