| Message ID | 1509337143-25963-7-git-send-email-mmaddireddy@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 30.10.2017 06:18, Manikanta Maddireddy wrote: > This patch ensures that DL sends pending ACKs and update FC packets when > link is idle instead of waiting for timers to expire which improves PCIe > bandwidth. > > Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> > --- > V2: > * no change in this patch > > drivers/pci/host/pci-tegra.c | 15 ++++++++++++++- > 1 file changed, 14 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c > index 51b7821646eb..bf615c5e6b78 100644 > --- a/drivers/pci/host/pci-tegra.c > +++ b/drivers/pci/host/pci-tegra.c > @@ -209,7 +209,9 @@ > #define RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK 0xffffffff > > #define RP_VEND_XP 0x00000f00 > -#define RP_VEND_XP_DL_UP (1 << 30) > +#define RP_VEND_XP_DL_UP (1 << 30) > +#define RP_VEND_XP_OPPORTUNISTIC_ACK (1 << 27) > +#define RP_VEND_XP_OPPORTUNISTIC_UPDATEFC (1 << 28) > > #define RP_VEND_CTL1 0xf48 > #define RP_VEND_CTL1_ERPT (1 << 13) > @@ -2147,6 +2149,16 @@ static void tegra_pcie_enable_rp_features(struct tegra_pcie_port *port) > writel(value, port->base + RP_VEND_CTL1); > } > > +static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port) > +{ > + unsigned long value; > + > + /* Optimal settings to enhance bandwidth */ > + value = readl(port->base + RP_VEND_XP); > + value |= RP_VEND_XP_OPPORTUNISTIC_ACK; > + value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC; > + writel(value, port->base + RP_VEND_XP); > +} > /* > * FIXME: If there are no PCIe cards attached, then calling this function > * can result in the increase of the bootup time as there are big timeout > @@ -2215,6 +2227,7 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) > if (soc->program_ectl_settings) > tegra_pcie_program_ectl_settings(port); > tegra_pcie_enable_rp_features(port); > + tegra_pcie_apply_sw_fixup(port); As in the AER patch, I think this can be done in-line here. Otherwise looks good. > } > > /* take the PCIe interface module out of reset */ >
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 51b7821646eb..bf615c5e6b78 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -209,7 +209,9 @@ #define RP_ECTL_6_R2_RX_EQ_CTRL_H_1C_MASK 0xffffffff #define RP_VEND_XP 0x00000f00 -#define RP_VEND_XP_DL_UP (1 << 30) +#define RP_VEND_XP_DL_UP (1 << 30) +#define RP_VEND_XP_OPPORTUNISTIC_ACK (1 << 27) +#define RP_VEND_XP_OPPORTUNISTIC_UPDATEFC (1 << 28) #define RP_VEND_CTL1 0xf48 #define RP_VEND_CTL1_ERPT (1 << 13) @@ -2147,6 +2149,16 @@ static void tegra_pcie_enable_rp_features(struct tegra_pcie_port *port) writel(value, port->base + RP_VEND_CTL1); } +static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port) +{ + unsigned long value; + + /* Optimal settings to enhance bandwidth */ + value = readl(port->base + RP_VEND_XP); + value |= RP_VEND_XP_OPPORTUNISTIC_ACK; + value |= RP_VEND_XP_OPPORTUNISTIC_UPDATEFC; + writel(value, port->base + RP_VEND_XP); +} /* * FIXME: If there are no PCIe cards attached, then calling this function * can result in the increase of the bootup time as there are big timeout @@ -2215,6 +2227,7 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) if (soc->program_ectl_settings) tegra_pcie_program_ectl_settings(port); tegra_pcie_enable_rp_features(port); + tegra_pcie_apply_sw_fixup(port); } /* take the PCIe interface module out of reset */
This patch ensures that DL sends pending ACKs and update FC packets when link is idle instead of waiting for timers to expire which improves PCIe bandwidth. Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> --- V2: * no change in this patch drivers/pci/host/pci-tegra.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)