diff mbox series

[12/15] drm/i915: Round up when calculating display bandwidth requirements

Message ID 20220118092354.11631-13-ville.syrjala@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series drm/i915: Fix bandwith related cdclk calculations | expand

Commit Message

Ville Syrjälä Jan. 18, 2022, 9:23 a.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

We should round up when doing bandwidth calculations to make sure
our estimates don't fall short of the actual number.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index a3f169686f14..b0cdad89c1ba 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -636,7 +636,7 @@  static unsigned int intel_bw_data_rate(struct drm_i915_private *dev_priv,
 		data_rate += bw_state->data_rate[pipe];
 
 	if (DISPLAY_VER(dev_priv) >= 13 && intel_vtd_active(dev_priv))
-		data_rate = data_rate * 105 / 100;
+		data_rate = DIV_ROUND_UP(data_rate * 105, 100);
 
 	return data_rate;
 }
@@ -761,7 +761,7 @@  int intel_bw_calc_min_cdclk(struct intel_atomic_state *state)
 		}
 	}
 
-	new_bw_state->min_cdclk = max_bw / 64;
+	new_bw_state->min_cdclk = DIV_ROUND_UP(max_bw, 64);
 
 	if (new_bw_state->min_cdclk != old_bw_state->min_cdclk) {
 		int ret = intel_atomic_lock_global_state(&new_bw_state->base);