disable FB

hc

2024-01-04 1543e317f1da31b75942316931e8f491a8920811

 kernel/drivers/gpu/drm/rockchip/rk628/rk628_combtxphy.c
..
..
@@ -366,6 +366,10 @@
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 		ref_clk = clk_get_rate(combtxphy->ref_clk) / 1000; /* khz */
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 		if (combtxphy->division_mode)
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 			ref_clk /= 2;
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+
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+		if (!ref_clk)
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+			return -EINVAL;
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+
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 		/*
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 		 * the reference clock at PFD(FPFD = ref_clk / ref_div) about
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 		 * 25MHz is recommende, FPFD must range from 16MHz to 35MHz,