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phy: sun4i: check PMU presence when poking unknown bit of pmu

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Allwinner SoC's PHY 0, when used as OTG controller, have no pmu part.
The code that poke some unknown bit of PMU for H3/A64 didn't check
the PHY, and will cause kernel oops when PHY 0 is used.

This patch will check whether the pmu is not NULL before poking.

Fixes: b3e0d141ca (phy: sun4i: add support for A64 usb phy)

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Icenowy Zheng 2016-10-29 00:27:01 +08:00 committed by Kishon Vijay Abraham I
parent 232c260982
commit 4320f9d4c1
1 changed files with 1 additions and 1 deletions
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2
drivers/phy/phy-sun4i-usb.c
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@ -264,7 +264,7 @@ static int sun4i_usb_phy_init(struct phy *_phy)
return ret;
}
if (data->cfg->enable_pmu_unk1) {
if (phy->pmu && data->cfg->enable_pmu_unk1) {
val = readl(phy->pmu + REG_PMU_UNK1);
writel(val & ~2, phy->pmu + REG_PMU_UNK1);
}