From 17f60b1cd260a24ef990d6622f9c5ed6951c0722 Mon Sep 17 00:00:00 2001 From: Thomas Reifferscheid Date: Tue, 28 Mar 2017 00:01:59 +0200 Subject: [PATCH] ipq8064: fix dwc3-of-simple module unloading Without patch unloading the dwc3-of-simple module went stuck after successfully removing hcd.1 during the hcd.0 removal: root@LEDE:/# rmmod dwc3-of-simple [ 21.391846] xhci-hcd xhci-hcd.1.auto: remove, state 1 [ 21.391931] usb usb4: USB disconnect, device number 1 [ 21.397038] xhci-hcd xhci-hcd.1.auto: USB bus 4 deregistered [ 21.401111] xhci-hcd xhci-hcd.1.auto: remove, state 1 [ 21.406685] usb usb3: USB disconnect, device number 1 [ 21.412848] xhci-hcd xhci-hcd.1.auto: USB bus 3 deregistered [ 21.417248] xhci-hcd xhci-hcd.0.auto: remove, state 1 [ 21.422521] usb usb2: USB disconnect, device number 1 followed by nothing. Sometimes a stall CPU was detected, or a kernel panic, or a reboot occurred after a couple of minutes. At the same time unloading the dwc3 module followed by dwc3-of-simple module was working repeatedly. root@LEDE:/# rmmod dwc3 [ 53.827328] xhci-hcd xhci-hcd.1.auto: remove, state 1 [ 53.827412] usb usb4: USB disconnect, device number 1 [ 53.832630] xhci-hcd xhci-hcd.1.auto: USB bus 4 deregistered [ 53.836452] xhci-hcd xhci-hcd.1.auto: remove, state 1 [ 53.842314] usb usb3: USB disconnect, device number 1 [ 53.848412] xhci-hcd xhci-hcd.1.auto: USB bus 3 deregistered [ 53.852542] xhci-hcd xhci-hcd.0.auto: remove, state 1 [ 53.857882] usb usb2: USB disconnect, device number 1 [ 53.863956] xhci-hcd xhci-hcd.0.auto: USB bus 2 deregistered [ 53.867875] xhci-hcd xhci-hcd.0.auto: remove, state 1 [ 53.873696] usb usb1: USB disconnect, device number 1 [ 53.879742] xhci-hcd xhci-hcd.0.auto: USB bus 1 deregistered root@LEDE:/# rmmod dwc3-of-simple root@LEDE:/# For the non-working case, the code was stuck in a readl() in http://lxr.free-electrons.com/source/drivers/usb/host/xhci.c#L91 because http://lxr.free-electrons.com/source/drivers/usb/dwc3/dwc3-of-simple.c#L126 was disabling the wrong clocks when removing hcd.1 (it was disabling the clock of hcd.0). That's why the readl() went stuck when removing hcd.0 The patch however addresses the clock assignment from the .dtsi file. Most probably it went into openwrt here: https://dev.openwrt.org/browser/trunk/target/linux/ipq806x/patches-3.18/101-ARM-qcom-add-USB-nodes-to-ipq806x-ap148.patch?rev=45261 copied from Qualcomms attempt here: https://lkml.org/lkml/2015/11/20/116 Now unloading and repeated module loading is working just fine, no matter if you'd remove dwc3-of-simple or dwc3. root@LEDE:/# rmmod dwc3-of-simple [ 24.089679] xhci-hcd xhci-hcd.1.auto: remove, state 1 [ 24.089765] usb usb4: USB disconnect, device number 1 [ 24.094856] xhci-hcd xhci-hcd.1.auto: USB bus 4 deregistered [ 24.098963] xhci-hcd xhci-hcd.1.auto: remove, state 1 [ 24.104522] usb usb3: USB disconnect, device number 1 [ 24.111194] xhci-hcd xhci-hcd.1.auto: USB bus 3 deregistered [ 24.115086] xhci-hcd xhci-hcd.0.auto: remove, state 1 [ 24.120396] usb usb2: USB disconnect, device number 1 [ 24.126503] xhci-hcd xhci-hcd.0.auto: USB bus 2 deregistered [ 24.130347] xhci-hcd xhci-hcd.0.auto: remove, state 1 [ 24.135948] usb usb1: USB disconnect, device number 1 [ 24.142085] xhci-hcd xhci-hcd.0.auto: USB bus 1 deregistered root@LEDE:/# Fixes: dwc3-of-simple module unloading Signed-off-by: Thomas Reifferscheid --- .../arch/arm/boot/dts/qcom-ipq8064.dtsi | 28 +++++++++---------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/target/linux/ipq806x/files-4.9/arch/arm/boot/dts/qcom-ipq8064.dtsi b/target/linux/ipq806x/files-4.9/arch/arm/boot/dts/qcom-ipq8064.dtsi index 9996bd7415..296e7ba9e3 100644 --- a/target/linux/ipq806x/files-4.9/arch/arm/boot/dts/qcom-ipq8064.dtsi +++ b/target/linux/ipq806x/files-4.9/arch/arm/boot/dts/qcom-ipq8064.dtsi @@ -918,9 +918,9 @@ reg = <0x01200600 0x100>; }; - hs_phy_1: phy@100f8800 { + hs_phy_1: phy@110f8800 { compatible = "qcom,dwc3-hs-usb-phy"; - reg = <0x100f8800 0x30>; + reg = <0x110f8800 0x30>; clocks = <&gcc USB30_1_UTMI_CLK>; clock-names = "ref"; #phy-cells = <0>; @@ -928,9 +928,9 @@ status = "disabled"; }; - ss_phy_1: phy@100f8830 { + ss_phy_1: phy@110f8830 { compatible = "qcom,dwc3-ss-usb-phy"; - reg = <0x100f8830 0x30>; + reg = <0x110f8830 0x30>; clocks = <&gcc USB30_1_MASTER_CLK>; clock-names = "ref"; #phy-cells = <0>; @@ -938,9 +938,9 @@ status = "disabled"; }; - hs_phy_0: phy@110f8800 { + hs_phy_0: phy@100f8800 { compatible = "qcom,dwc3-hs-usb-phy"; - reg = <0x110f8800 0x30>; + reg = <0x100f8800 0x30>; clocks = <&gcc USB30_0_UTMI_CLK>; clock-names = "ref"; #phy-cells = <0>; @@ -948,9 +948,9 @@ status = "disabled"; }; - ss_phy_0: phy@110f8830 { + ss_phy_0: phy@100f8830 { compatible = "qcom,dwc3-ss-usb-phy"; - reg = <0x110f8830 0x30>; + reg = <0x100f8830 0x30>; clocks = <&gcc USB30_0_MASTER_CLK>; clock-names = "ref"; #phy-cells = <0>; @@ -969,10 +969,10 @@ status = "disabled"; - dwc3@11000000 { + dwc3@10000000 { compatible = "snps,dwc3"; - reg = <0x11000000 0xcd00>; - interrupts = <0 110 0x4>; + reg = <0x10000000 0xcd00>; + interrupts = <0 205 0x4>; phys = <&hs_phy_0>, <&ss_phy_0>; phy-names = "usb2-phy", "usb3-phy"; dr_mode = "host"; @@ -991,10 +991,10 @@ status = "disabled"; - dwc3@10000000 { + dwc3@11000000 { compatible = "snps,dwc3"; - reg = <0x10000000 0xcd00>; - interrupts = <0 205 0x4>; + reg = <0x11000000 0xcd00>; + interrupts = <0 110 0x4>; phys = <&hs_phy_1>, <&ss_phy_1>; phy-names = "usb2-phy", "usb3-phy"; dr_mode = "host";