On Wed, Jun 12, 2024 at 12:02:08AM GMT, Mitul Golani wrote:
Fix few divisions which may not work on 32b builds.
Use DIV_ROUND_UP, with that expecting deviate params
from +/- 1 accuracy in value.
Fixes: 1676ecd303ac ("drm/i915: Compute CMRR and calculate vtotal")
Signed-off-by: Mitul Golani <[email protected]>
---
drivers/gpu/drm/i915/display/intel_vrr.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c
b/drivers/gpu/drm/i915/display/intel_vrr.c
index 05f67dc9d98d..5112961f6964 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -122,10 +122,11 @@ is_cmrr_frac_required(struct intel_crtc_state *crtc_state)
actual_refresh_k =
drm_mode_vrefresh(adjusted_mode) * FIXED_POINT_PRECISION;
- pixel_clock_per_line =
- adjusted_mode->crtc_clock * 1000 / adjusted_mode->crtc_htotal;
+ pixel_clock_per_line = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000,
+ adjusted_mode->crtc_htotal);
calculated_refresh_k =
- pixel_clock_per_line * FIXED_POINT_PRECISION /
adjusted_mode->crtc_vtotal;
+ DIV_ROUND_UP(pixel_clock_per_line * FIXED_POINT_PRECISION,
+ adjusted_mode->crtc_vtotal);
if ((actual_refresh_k - calculated_refresh_k) <
CMRR_PRECISION_TOLERANCE)
return false;
@@ -149,7 +150,8 @@ cmrr_get_vtotal(struct intel_crtc_state *crtc_state, bool
video_mode_required)
crtc_state->cmrr.cmrr_n =
desired_refresh_rate * adjusted_mode->crtc_htotal *
multiplier_n;
- vtotal = (adjusted_mode->crtc_clock * 1000 * multiplier_n) /
crtc_state->cmrr.cmrr_n;
+ vtotal = DIV_ROUND_UP(adjusted_mode->crtc_clock * 1000 * multiplier_n,
+ crtc_state->cmrr.cmrr_n);
to fix the 32b build you need to build with DIV_ROUND_UP_ULL().
Lucas De Marchi
adjusted_pixel_rate = adjusted_mode->crtc_clock * 1000 * multiplier_m;
crtc_state->cmrr.cmrr_m = do_div(adjusted_pixel_rate,
crtc_state->cmrr.cmrr_n);
--
2.45.2
