evie/android_kernel_oneplus_msm8998
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usb: phy: qusb: Keep LDOs ON during disconnect if PMI voted for it

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PMI software requests PHY driver to turn-ON LDOs before running
charger detection. This is needed to have USB data lines in hi-Z
state. If there is race between USB driver processing disconnect
and next rm_pulldown request, then there is a possibility of
PHY driver turning-off LDOs even if PMI voted for it. This can
cause charger detection to fail. To fix this add a check in PHY
driver to check PMI vote in disconnect handling.

Change-Id: I6e873207aeee60e8e933430fc4e755aef81ab447
CRs-fixed: 1097343
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
This commit is contained in:
Manu Gautam 2016-12-15 11:39:46 +05:30 • committed by Vijayavardhan Vennapusa
parent 2d28ff0953
commit 317f5e44fb
1 changed files with 6 additions and 1 deletions
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7
drivers/usb/phy/phy-msm-qusb.c
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@ -701,7 +701,12 @@ static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend)
if (qphy->tcsr_clamp_dig_n)
writel_relaxed(0x0,
qphy->tcsr_clamp_dig_n);
qusb_phy_enable_power(qphy, false);
/* Do not disable power rails if there is vote for it */
if (!qphy->rm_pulldown)
qusb_phy_enable_power(qphy, false);
else
dev_dbg(phy->dev, "race with rm_pulldown. Keep ldo ON\n");
/*
* Set put_into_high_z_state to true so next USB
* cable connect, DPF_DMF request performs PHY