On Mon, Mar 20, 2017 at 05:39:40PM +0800, Shawn Lin wrote: > Read Completion Boundary could be 64 bytes or 128 bytes > for rockchip RC. The reset value of RCB is zero which means > it doesn't support RCB to be 128 bytes, however it does support > that. When setting the RCB to 128 bytes, we see some significant > improvment for testing NVMe with libaio. So this patch will set > RC's RCB to 128 bytes. > > Cc: Brian Norris <briannorris@xxxxxxxxxxxx> > Cc: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx> > Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> Applied to pci/host-rockchip for v4.12, thanks! > --- > > drivers/pci/host/pcie-rockchip.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c > index 26ddd35..8bcd417 100644 > --- a/drivers/pci/host/pcie-rockchip.c > +++ b/drivers/pci/host/pcie-rockchip.c > @@ -599,6 +599,11 @@ 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); > -- > 1.9.1 > >
