[PATCH 0/3] Fix USB3.0 DRD PHY calibration issues (DWC3/XHCI) on Exynos542x SoCs

[Marek Szyprowski]

Dear All,

Commit d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for
exynos5420/5800") added support for Exynos5 USB3.0 DRD PHY calibration,
what enabled proper Super-Speed enumeration of USB3.0 devices connected
to various Exynos5 SoCs. After some time it turned out that the mentioned
patch worked a bit by pure luck and covered only one use case (fresh
boot with all drivers compiled into the kernel).

If drivers were compiled as modules, due to timing issue, it worked only
if XHCI-plat driver was loaded before the DWC3 driver:
https://patchwork.kernel.org/patch/10773947/

Also during the system suspend/resume cycle the calibration was not
performed at the proper time and resulted in switching USB 3.0 devices to
USB 2.0 high-speed compatibility mode.

This patch addresses all those issues. Exynos5 USB3.0 DRD PHY calibration
is moved to the Exynos5 specific variant of the XHCI-plat driver, which
takes care of proper PHY calibration after XHCI core reset. This fixes
all known use cases (XHCI driver compiled as module and loaded on demand
as well as during system suspend/resume cycle).

Here are the logs taken on Exynos5422-based Odroid HC1 board (with USB3.0
RTL8153 LAN and USB3.0 JMicron SATA-USB bridge):

Vanilla Linux next-20190620:
----->8-----------------------------------------------------------------
root@target:~# lsusb -t
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=r8152, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=exynos-ohci/3p, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=exynos-ehci/3p, 480M
root@target:~# time rtcwake -s 10 -m mem
rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jan  1 01:03:40 2019
[   31.372801] PM: suspend entry (deep)
[   31.376555] Filesystems sync: 0.001 seconds
[   31.396437] Freezing user space processes ... (elapsed 0.006 seconds) done.
[   31.408300] OOM killer disabled.
[   31.411329] Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done.
[   31.419336] printk: Suspending console(s) (use no_console_suspend to debug)
[   31.508432] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[   31.586243] wake enabled for irq 145
[   31.748908] samsung-pinctrl 13400000.pinctrl: Setting external wakeup interrupt mask: 0xffffffef
[   31.758671] Disabling non-boot CPUs ...
[   31.772117] IRQ 51: no longer affine to CPU1
[   31.782147] IRQ 52: no longer affine to CPU2
[   31.789290] IRQ 53: no longer affine to CPU3
[   31.792439] IRQ 54: no longer affine to CPU4
[   31.794942] IRQ 55: no longer affine to CPU5
[   31.797365] IRQ 56: no longer affine to CPU6
[   31.801387] IRQ 57: no longer affine to CPU7
[   31.811149] Enabling non-boot CPUs ...
[   31.815607] CPU1 is up
[   31.818790] CPU2 is up
[   31.821709] CPU3 is up
[   31.826095] CPU4 is up
[   31.828672] CPU5 is up
[   31.831215] CPU6 is up
[   31.834158] CPU7 is up
[   31.859900] s3c2410-wdt 101d0000.watchdog: watchdog disabled
[   31.860158] usb usb1: root hub lost power or was reset
[   31.931175] usb usb2: root hub lost power or was reset
[   31.940717] wake disabled for irq 145
[   31.949146] usb usb3: root hub lost power or was reset
[   31.949235] usb usb4: root hub lost power or was reset
[   31.949329] s3c-rtc 101e0000.rtc: rtc disabled, re-enabling
[   31.950751] usb usb5: root hub lost power or was reset
[   31.950773] usb usb6: root hub lost power or was reset
[   36.201351] OOM killer enabled.
[   36.204381] Restarting tasks ...
[   36.206110] usb 4-1: USB disconnect, device number 2
[   36.206529] usb 6-1: USB disconnect, device number 2
[   36.210588] done.
[   36.220679] PM: suspend exit

real    0m15.613s
user    0m0.000s
sys     0m0.329s
[   36.237525] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[   36.254403] mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 400000Hz, actual 396825HZ div = 63)
root@target:~# [   36.341609] mmc_host mmc0: Bus speed (slot 0) = 200000000Hz (slot req 200000000Hz, actual 200000000HZ div = 0)
[   36.597244] usb 5-1: new high-speed USB device number 3 using xhci-hcd
[   36.837573] sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result: hostbyte=0x07 driverbyte=0x00
[   37.099089] usb 5-1: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=30.00
[   37.105793] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6
[   37.112962] usb 5-1: Product: USB 10/100/1000 LAN
[   37.117629] usb 5-1: Manufacturer: Realtek
[   37.121645] usb 5-1: SerialNumber: 000001000000
[   37.373152] usb 5-1: reset high-speed USB device number 3 using xhci-hcd
[   37.407459] usb usb3-port1: Cannot enable. Maybe the USB cable is bad?
[   37.664128] r8152 5-1:1.0 eth0: v1.09.9
[   38.437326] usb 3-1: new high-speed USB device number 3 using xhci-hcd
[   38.628713] usb 3-1: New USB device found, idVendor=152d, idProduct=0578, bcdDevice= 1.05
[   38.635470] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   38.642803] usb 3-1: Product: USB to SATA bridge
[   38.647321] usb 3-1: Manufacturer: JMicron
[   38.651232] usb 3-1: SerialNumber: DB00000000013B
[   38.678606] scsi host0: uas
[   38.687425] scsi 0:0:0:0: Direct-Access     JMicron                   0105 PQ: 0 ANSI: 6
[   38.704216] sd 0:0:0:0: Attached scsi generic sg0 type 0
[   38.710333] sd 0:0:0:0: [sda] 1953525168 512-byte logical blocks: (1.00 TB/932 GiB)
[   38.716641] sd 0:0:0:0: [sda] 4096-byte physical blocks
[   38.723383] sd 0:0:0:0: [sda] Write Protect is off
[   38.730019] sd 0:0:0:0: [sda] Disabling FUA
[   38.732737] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[   38.743524] sd 0:0:0:0: [sda] Optimal transfer size 33553920 bytes not a multiple of physical block size (4096 bytes)
[   38.855590]  sda: sda1 sda2 sda3 sda4 < sda5 sda6 >
[   38.887585] sd 0:0:0:0: [sda] Attached SCSI disk
[   40.968358] usb usb6-port1: Cannot enable. Maybe the USB cable is bad?
[   45.288065] usb usb6-port1: Cannot enable. Maybe the USB cable is bad?

root@target:~# lsusb -t
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
    |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=r8152, 480M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
    |__ Port 1: Dev 3, If 0, Class=Mass Storage, Driver=uas, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=exynos-ohci/3p, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=exynos-ehci/3p, 480M
root@target:~#
----->8-----------------------------------------------------------------


Linux next-20190620 with this patchset applied:
----->8-----------------------------------------------------------------
root@target:~# lsusb -t
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=r8152, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=exynos-ohci/3p, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=exynos-ehci/3p, 480M
root@target:~# time rtcwake -s 10 -m mem
rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jan  1 01:08:06 2019
[   33.057518] PM: suspend entry (deep)
[   33.068116] Filesystems sync: 0.007 seconds
[   33.100867] Freezing user space processes ... (elapsed 0.004 seconds) done.
[   33.110697] OOM killer disabled.
[   33.113758] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
[   33.121699] printk: Suspending console(s) (use no_console_suspend to debug)
[   33.206799] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[   33.284135] wake enabled for irq 145
[   33.447955] samsung-pinctrl 13400000.pinctrl: Setting external wakeup interrupt mask: 0xffffffef
[   33.459351] Disabling non-boot CPUs ...
[   33.469730] IRQ 51: no longer affine to CPU1
[   33.478596] IRQ 52: no longer affine to CPU2
[   33.484306] IRQ 53: no longer affine to CPU3
[   33.487255] IRQ 54: no longer affine to CPU4
[   33.490071] IRQ 55: no longer affine to CPU5
[   33.492706] IRQ 56: no longer affine to CPU6
[   33.496822] IRQ 57: no longer affine to CPU7
[   33.503482] Enabling non-boot CPUs ...
[   33.508159] CPU1 is up
[   33.511114] CPU2 is up
[   33.514131] CPU3 is up
[   33.518772] CPU4 is up
[   33.521219] CPU5 is up
[   33.523782] CPU6 is up
[   33.526860] CPU7 is up
[   33.551393] s3c2410-wdt 101d0000.watchdog: watchdog disabled
[   33.551651] usb usb1: root hub lost power or was reset
[   33.619193] usb usb2: root hub lost power or was reset
[   33.628517] wake disabled for irq 145
[   33.636675] usb usb3: root hub lost power or was reset
[   33.636768] usb usb4: root hub lost power or was reset
[   33.636883] s3c-rtc 101e0000.rtc: rtc disabled, re-enabling
[   33.636915] usb usb5: root hub lost power or was reset
[   33.636931] usb usb6: root hub lost power or was reset
[   37.556700] usb 4-1: reset SuperSpeed Gen 1 USB device number 2 using xhci-hcd
[   37.890524] OOM killer enabled.
[   37.893600] Restarting tasks ...
[   37.895049] usb 6-1: USB disconnect, device number 2
[   37.897862] done.
[   37.904761] PM: suspend exit

real    0m14.651s
user    0m0.000s
sys     0m0.360s
[   37.931922] mmc_host mmc0: Bus speed (slot 0) = 50000000Hz (slot req 400000Hz, actual 396825HZ div = 63)
root@target:~# [   38.025326] mmc_host mmc0: Bus speed (slot 0) = 200000000Hz (slot req 200000000Hz, actual 200000000HZ div = 0)
[   38.895675] usb 6-1: new SuperSpeed Gen 1 USB device number 3 using xhci-hcd
[   38.929327] usb 6-1: New USB device found, idVendor=0bda, idProduct=8153, bcdDevice=30.00
[   38.936156] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6
[   38.943157] usb 6-1: Product: USB 10/100/1000 LAN
[   38.947944] usb 6-1: Manufacturer: Realtek
[   38.951891] usb 6-1: SerialNumber: 000001000000
[   39.215806] usb 6-1: reset SuperSpeed Gen 1 USB device number 3 using xhci-hcd
[   39.351893] r8152 6-1:1.0 eth0: v1.09.9

root@target:~# lsusb -t
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=r8152, 5000M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
    |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=exynos-ohci/3p, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=exynos-ehci/3p, 480M
root@target:~#
----->8-----------------------------------------------------------------


Best regards
Marek Szyprowski
Samsung R&D Institute Poland


Patch summary:

Marek Szyprowski (3):
  usb: host: xhci-plat: Add support for Exynos5/DWC3 specific variant
  usb: dwc3: exynos: Use Exynos specific XHCI-plat driver variant
  usb: dwc3: Remove generic PHY calibrate() calls

 drivers/usb/dwc3/Kconfig       |  1 +
 drivers/usb/dwc3/core.c        |  3 +-
 drivers/usb/dwc3/core.h        |  1 +
 drivers/usb/dwc3/dwc3-exynos.c | 64 +++++++++++++++++++++++-----------
 drivers/usb/dwc3/host.c        |  2 +-
 drivers/usb/host/Kconfig       |  8 +++++
 drivers/usb/host/Makefile      |  3 ++
 drivers/usb/host/xhci-exynos.c | 51 +++++++++++++++++++++++++++
 drivers/usb/host/xhci-exynos.h | 26 ++++++++++++++
 drivers/usb/host/xhci-plat.c   | 38 +++++++++++++++++++-
 drivers/usb/host/xhci-plat.h   |  2 ++
 11 files changed, 174 insertions(+), 25 deletions(-)
 create mode 100644 drivers/usb/host/xhci-exynos.c
 create mode 100644 drivers/usb/host/xhci-exynos.h

-- 
2.17.1