From ce1de068b83b72e91be4f8df93ef7d3a3a182989 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Thu, 3 Mar 2022 21:12:04 +0200
Subject: drm/i915: Round up when calculating display bandwidth requirements
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Git-commit: 6c69d0bb9f15cdbc8fd6134e2c66438b69bb9581
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
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>
Link: https://patchwork.freedesktop.org/patch/msgid/20220303191207.27931-7-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
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 e991949c6e5d..8155f2309f80 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);
--
2.38.1