[PATCH v3 0/4] Fine tune USB 3.0 PHY on exynos5420

[Vivek Gautam]

This series is based on Heikki's patches for simpliefied phy lookup table:
[PATCHv2 0/6] phy: simplified phy lookup [1], applied against 'next' branch
of Kishon's linux-phy tree.

Changes since v2:
1) Removed any check for DWC3 in xhci-plat for getting usb2-phy and usb3-phy,
   in order to make it more generic.
2) Moved the phy_calibration calls to core/hcd.c to enable a more generic
   solution for issues of calibrating the PHYs.

Changes since v1:
1) Using 'gen_phy' member of 'hcd' instead of declaring more variables
   to hold phys.
2) Added a check for compatible match for 'Synopsys-dwc3' controller,
   since the 'gen_phy' member of 'hcd' already gets the 'usb' PHY
   in core/hcd.c; but XHCI on Synopsys-dwc3 doesn't need that,
   instead two separate PHYs for UTMI+ and PIPE3 for the two HCDs
   (main hcd and shared hcd).
3) Restructured the code in 'xhci_plat_setup()' and 'xhci_plat_resume()'
   to use hcd->gen_phy directly. Also added the check for Synopsys's DWC3
   controller while trying to calibrate the PHY.

Explanation for the need of this patch-series:
"The DWC3-exynos eXtensible host controller present on Exynos5420/5800
SoCs is quirky. The PHY serving this controller operates at High-Speed
by default, so it detects even Super-speed devices as high-speed ones.
Certain PHY parameters like Tx LOS levels and Boost levels need to be
calibrated further post initialization of xHCI controller, to get
SuperSpeed operations working."

[1] https://lkml.org/lkml/2014/6/5/358

Vivek Gautam (4):
  phy: Add provision for calibrating phy.
  usb: host: xhci-plat: Get PHYs for xhci's hcds
  usb: hcd: Caibrate PHY post hcd reset
  phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800

 drivers/phy/phy-core.c           |   36 ++++++++
 drivers/phy/phy-exynos5-usbdrd.c |  169 ++++++++++++++++++++++++++++++++++++++
 drivers/usb/core/hcd.c           |   22 +++++
 drivers/usb/host/xhci-plat.c     |   17 ++++
 include/linux/phy/phy.h          |    8 ++
 5 files changed, 252 insertions(+)

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1.7.10.4