--- /tmp/orig/dev/drm/amd/amdgpu/amdgpu_pll.c	2026-07-23 11:54:56.694859000 +0000
+++ dev/drm/amd/amdgpu/amdgpu_pll.c	2026-07-23 11:57:17.676284000 +0000
@@ -121,6 +121,8 @@
 {
 	unsigned target_clock = pll->flags & AMDGPU_PLL_USE_FRAC_FB_DIV ?
 		freq : freq / 10;
+	if (target_clock == 0)
+		return;
 
 	unsigned fb_div_min, fb_div_max, fb_div;
 	unsigned post_div_min, post_div_max, post_div;