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PCI: tegra: Enable opportunistic UpdateFC and ACK

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Enable opportunistic UpdateFC and ACK to allow data link layer send
pending ACKs and UpdateFC packets when link is idle instead of waiting
for timers to expire. This improves the PCIe performance due to better
utilization of PCIe bandwidth.

Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Manikanta Maddireddy 2019-06-18 23:31:48 +05:30 committed by Lorenzo Pieralisi
parent 2513a4ee47
commit 7763cc24e2
1 changed files with 9 additions and 1 deletions
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10
drivers/pci/controller/pci-tegra.c
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@ -204,7 +204,9 @@
#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 0x00000f48
#define RP_VEND_CTL1_ERPT (1 << 13)
@ -529,6 +531,12 @@ static void tegra_pcie_enable_rp_features(struct tegra_pcie_port *port)
value = readl(port->base + RP_VEND_CTL1);
value |= RP_VEND_CTL1_ERPT;
writel(value, port->base + RP_VEND_CTL1);
/* 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);
}
static void tegra_pcie_program_ectl_settings(struct tegra_pcie_port *port)