diff options
| author | Shawn Lin <shawn.lin@rock-chips.com> | 2017-03-20 17:39:40 +0800 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-04-03 16:04:48 -0500 |
| commit | 55021718b9e9d21efd47117dd0e6c1cfebd654f8 (patch) | |
| tree | e987730711f1638269de02fd4006742e1ca3e218 /drivers/pci/host | |
| parent | deb518f6ae4d5da22fb1e8d6c6a690253ffa700d (diff) | |
| download | linux-55021718b9e9d21efd47117dd0e6c1cfebd654f8.tar.bz2 | |
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>
Diffstat (limited to 'drivers/pci/host')
| -rw-r--r-- | drivers/pci/host/pcie-rockchip.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c index b4dfe3bd15c3..a7467212ea18 100644 --- a/drivers/pci/host/pcie-rockchip.c +++ b/drivers/pci/host/pcie-rockchip.c @@ -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); |