Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 55021718 authored by Shawn Lin's avatar Shawn Lin Committed by Bjorn Helgaas
Browse files

PCI: rockchip: Advertise 128-byte Read Completion Boundary support 



Rockchip Root Ports support either 64 or 128 byte Read Completion Boundary
(RCB).  Set the RCB bit in the Link Control register to indicate this.

A 128 byte RCB significantly improves performance of NVMe with libaio.

[bhelgaas: changelog]
Signed-off-by: default avatarShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Cc: Brian Norris <briannorris@chromium.org>
Cc: Jeffy Chen <jeffy.chen@rock-chips.com>
parent deb518f6

drivers/pci/host/pcie-rockchip.c

+5 −0
Original line number Diff line number Diff line
@@ -601,6 +601,11 @@ static int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) 
	status |= PCI_EXP_LNKCTL_CCC;

	rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);



	/* Set RC's RCB to 128 */

	status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_LCS);

	status |= PCI_EXP_LNKCTL_RCB;

	rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_LCS);



	/* Enable Gen1 training */

	rockchip_pcie_write(rockchip, PCIE_CLIENT_LINK_TRAIN_ENABLE,

			    PCIE_CLIENT_CONFIG);