From 6c69d0bb9f15cdbc8fd6134e2c66438b69bb9581 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Thu, 3 Mar 2022 21:12:04 +0200 Subject: [PATCH] drm/i915: Round up when calculating display bandwidth requirements MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: https://patchwork.freedesktop.org/patch/msgid/20220303191207.27931-7-ville.syrjala@linux.intel.com Reviewed-by: Stanislav Lisovskiy --- drivers/gpu/drm/i915/display/intel_bw.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c index e991949..8155f23 100644 --- a/drivers/gpu/drm/i915/display/intel_bw.c +++ b/drivers/gpu/drm/i915/display/intel_bw.c @@ -638,7 +638,7 @@ 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; } @@ -763,7 +763,7 @@ 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); -- 2.7.4