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

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);
}