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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: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Brian Norris <briannorris@chromium.org>
Cc: Jeffy Chen <jeffy.chen@rock-chips.com>
This commit is contained in:
Shawn Lin 2017-03-20 17:39:40 +08:00 committed by Bjorn Helgaas
parent deb518f6ae
commit 55021718b9
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/host/pcie-rockchip.c
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@ -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);