The intermediate value 1000000 * 10 * 9671 overflows 32 bits, so force
promotion to a bigger type.
>From the logs:
[drm:intel_dp_compute_config [i915]] DP link rate required 3657063 available
-580783288
v2: Use mul_u32_u32() (Ville)
Fixes: 48efd014f0ea ("drm/i915/dp: add max data rate calculation for UHBR
rates")
Cc: Manasi Navare <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
---
drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
b/drivers/gpu/drm/i915/display/intel_dp.c
index f5dc2126d140..537c689a1528 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -352,7 +352,7 @@ intel_dp_max_data_rate(int max_link_rate, int max_lanes)
*/
int max_link_rate_kbps = max_link_rate * 10;
- max_link_rate_kbps = DIV_ROUND_CLOSEST_ULL(max_link_rate_kbps *
9671, 10000);
+ max_link_rate_kbps =
DIV_ROUND_CLOSEST_ULL(mul_u32_u32(max_link_rate_kbps, 9671), 10000);
max_link_rate = max_link_rate_kbps / 8;
}
--
2.30.2
