Re: [PATCH] ARM: dts: Odroid XU4: fix USB3.0 ports

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Hi Krzysztof,

On 2017-01-25 08:55, Krzysztof Kozlowski wrote:
On Wed, Jan 25, 2017 at 7:51 AM, Anand Moon <linux.amoon@xxxxxxxxx> wrote:
On 24 January 2017 at 19:18, Richard Genoud <richard.genoud@xxxxxxxxx> wrote:
Since commit 2164a476205ccc ("usb: dwc3: set SUSPHY bit for all cores"),
the USB ports on odroid-XU4 don't work anymore.

Inserting an usb key (USB2.0) on the USB3.0 port result in:
[   64.488264] xhci-hcd xhci-hcd.2.auto: Port resume took longer than 20000 msec, port status = 0xc400fe3
[   74.568156] xhci-hcd xhci-hcd.2.auto: xHCI host not responding to stop endpoint command.
[   74.574806] xhci-hcd xhci-hcd.2.auto: Assuming host is dying, halting host.
[   74.601970] xhci-hcd xhci-hcd.2.auto: HC died; cleaning up
[   74.606276] usb 3-1: USB disconnect, device number 2
[   74.613565] usb 4-1: USB disconnect, device number 2
[   74.621208] usb usb3-port1: couldn't allocate usb_device
NB: it's not related to USB2.0 devices, I get the same result with an USB3.0 device (SATA to USB3 for instance).
NB2: it doesn't happen on an odriod-XU3 board, that doesn't have the realtek RTL8153 chip.

If the lines:
         if (dwc->revision > DWC3_REVISION_194A)
                 reg |= DWC3_GUSB3PIPECTL_SUSPHY;
are commented out, the USB3.0 start working.

For a full analyse: https://lkml.org/lkml/2017/1/18/678

Felipe suggested that suspend should be disabled temporarily while
what's wrong with DCW3 is figured out.

Tested on Odroid XU4

Suggested-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Tested-by: Richard Genoud <richard.genoud@xxxxxxxxx>
Signed-off-by: Richard Genoud <richard.genoud@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 4.4+
Fixes: 2164a476205ccc ("usb: dwc3: set SUSPHY bit for all cores")
---
  arch/arm/boot/dts/exynos5422-odroidxu4.dts | 9 +++++++++
  1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5422-odroidxu4.dts b/arch/arm/boot/dts/exynos5422-odroidxu4.dts
index 2faf88627a48..f62dbd9b5ad3 100644
--- a/arch/arm/boot/dts/exynos5422-odroidxu4.dts
+++ b/arch/arm/boot/dts/exynos5422-odroidxu4.dts
@@ -43,6 +43,15 @@
         status = "okay";
  };

+&usbdrd_dwc3_0 {
+       /*
+        * without that, usb devices are not recognized when
+        * they are plugged.
+        * cf: https://lkml.org/lkml/2017/1/18/678
+        */
+       snps,dis_u3_susphy_quirk;
+};
+
  &usbdrd_dwc3_1 {
         dr_mode = "host";
  };
--
Thanks for this patch.
But could you consider moving this changes as below.

https://lkml.org/lkml/2015/3/18/400
The patch above (and other DTS patches from the set) was not even sent
to linux-samsung-soc nor to me... It is sad how easily one's work can
disappear. Also, it is really worthless to solve the same problem
twice.

Well, they were sent about 2 years ago... and you were also working on this
topic. ;)

Cc Marek and Bartlomiej,
Guys, do you want to continue with Robert's patch (linked above by
Anand)? If yes, please take the ownership (Robert's address is not
valid anymore). If not, I will take Richard's patch after
resubmission.

Take Richard's patch because it has a bit more details describing why such quirk
is needed.

Richard: in Roberts patch there is also a quirk for USB 2.0 mode
(snps,dis_u2_susphy_quirk). Could you check if it really needed?

Maybe it would make sense to set those quirks for both DWC3 controllers, as this
issue with PHY suspend seems to be a Exynos specific thing.

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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