Update calculation to avoid overflow.
Fixes: 1676ecd303ac ("drm/i915: Compute CMRR and calculate vtotal")
Cc: Mitul Golani <[email protected]>
Cc: Ankit Nautiyal <[email protected]>
Cc: Suraj Kandpal <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Mitul Golani <[email protected]>
Reviewed-by: Ankit Nautiyal <[email protected]>
---
drivers/gpu/drm/i915/display/intel_vrr.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c
b/drivers/gpu/drm/i915/display/intel_vrr.c
index eb5b62b54d32..6430da25957d 100644
--- a/drivers/gpu/drm/i915/display/intel_vrr.c
+++ b/drivers/gpu/drm/i915/display/intel_vrr.c
@@ -147,10 +147,11 @@ cmrr_get_vtotal(struct intel_crtc_state *crtc_state, bool
video_mode_required)
multiplier_n = 1000;
}
- 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;
- adjusted_pixel_rate = adjusted_mode->crtc_clock * 1000 * multiplier_m;
+ crtc_state->cmrr.cmrr_n = mul_u32_u32(desired_refresh_rate *
adjusted_mode->crtc_htotal,
+ multiplier_n);
+ vtotal = DIV_ROUND_UP_ULL(mul_u32_u32(adjusted_mode->crtc_clock * 1000,
multiplier_n),
+ crtc_state->cmrr.cmrr_n);
+ adjusted_pixel_rate = mul_u32_u32(adjusted_mode->crtc_clock * 1000,
multiplier_m);
crtc_state->cmrr.cmrr_m = do_div(adjusted_pixel_rate,
crtc_state->cmrr.cmrr_n);
return vtotal;
--
2.45.2
