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@@ -466,11 +466,20 @@ void tegra_dc_sor_set_lane_count(struct udevice *dev, u8 lane_count)
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static int tegra_dc_sor_power_up(struct udevice *dev, int is_lvds)
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{
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struct tegra_dc_sor_data *sor = dev_get_priv(dev);
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+ u32 reg;
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int ret;
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if (sor->power_is_up)
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return 0;
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+ /*
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+ * If for some reason it is already powered up, don't do it again.
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+ * This can happen if U-Boot is the secondary boot loader.
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+ */
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+ reg = tegra_sor_readl(sor, DP_PADCTL(sor->portnum));
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+ if (reg & DP_PADCTL_PD_TXD_0_NO)
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+ return 0;
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+
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/* Set link bw */
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tegra_dc_sor_set_link_bandwidth(dev, is_lvds ?
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CLK_CNTRL_DP_LINK_SPEED_LVDS :
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