mbox series

[v2,0/2] Add support to handle ZRX-DC Compliant PHYs

Message ID 1572264988-17455-1-git-send-email-anvesh.s@samsung.com (mailing list archive)
Headers show
Series Add support to handle ZRX-DC Compliant PHYs | expand

Message

Anvesh Salveru Oct. 28, 2019, 12:16 p.m. UTC 
According the PCI Express base specification when PHY does not meet
ZRX-DC specification, after every 100ms timeout the link should
transition to recovery state when the link is in low power states. 

Ports that meet the ZRX-DC specification for 2.5 GT/s while in the
L1.Idle state and are therefore not required to implement the 100 ms
timeout and transition to Recovery should avoid implementing it, since
it will reduce the power savings expected from the L1 state.

DesignWare controller provides GEN3_ZRXDC_NONCOMPL field in
GEN3_RELATED_OFF to specify about ZRX-DC compliant PHY.

Anvesh Salveru (2):
  dt-bindings: PCI: designware: Add binding for ZRX-DC PHY property
  PCI: dwc: Add support to handle ZRX-DC Compliant PHYs

 Documentation/devicetree/bindings/pci/designware-pcie.txt | 2 ++
 drivers/pci/controller/dwc/pcie-designware.c              | 7 +++++++
 drivers/pci/controller/dwc/pcie-designware.h              | 3 +++
 3 files changed, 12 insertions(+)