drm/radeon: Fix overflow of watermark calcs at > 4k resolutions.

[karo-tx-linux.git] / drivers / gpu / drm / radeon / cik.c

diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 008c145b7f29f60a298419931f1922555de5e35a..ca44233ceaccb87482068d992e4c415f756fa540 100644 (file)
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -9267,8 +9267,11 @@ static void dce8_program_watermarks(struct radeon_device *rdev,
        u32 tmp, wm_mask;
 
        if (radeon_crtc->base.enabled && num_heads && mode) {
-               active_time = 1000000UL * (u32)mode->crtc_hdisplay / (u32)mode->clock;
-               line_time = min((u32) (1000000UL * (u32)mode->crtc_htotal / (u32)mode->clock), (u32)65535);
+               active_time = (u32) div_u64((u64)mode->crtc_hdisplay * 1000000,
+                                           (u32)mode->clock);
+               line_time = (u32) div_u64((u64)mode->crtc_htotal * 1000000,
+                                         (u32)mode->clock);
+               line_time = min(line_time, (u32)65535);
 
                /* watermark for high clocks */
                if ((rdev->pm.pm_method == PM_METHOD_DPM) &&