Re: [PATCH v2] phy: sun4i: check PMU presence when poking unknown bit of pmu

[Hans de Goede]

Hi,

On 28-10-16 18:27, Icenowy Zheng wrote:

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: b3e0d141ca9f (phy: sun4i: add support for A64 usb phy)

Signed-off-by: Icenowy Zheng <icen...@aosc.xyz>
Acked-by: Maxime Ripard <maxime.rip...@free-electrons.com>

Patch LGTM too:

Reviewed-by: Hans de Goede <hdego...@redhat.com>

Regards,

Hans

---
 drivers/phy/phy-sun4i-usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index b9342a2..fec34f5 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -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);
        }