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From: Manikanta Maddireddy <mmaddireddy@nvidia.com>
To: <thierry.reding@gmail.com>, <bhelgaas@google.com>,
	<robh+dt@kernel.org>, <mark.rutland@arm.com>,
	<jonathanh@nvidia.com>, <lorenzo.pieralisi@arm.com>,
	<vidyas@nvidia.com>
Cc: <linux-tegra@vger.kernel.org>, <linux-pci@vger.kernel.org>,
	<devicetree@vger.kernel.org>,
	Manikanta Maddireddy <mmaddireddy@nvidia.com>
Subject: [PATCH V5 09/27] PCI: tegra: Enable opportunistic UpdateFC and ACK
Date: Mon, 17 Jun 2019 23:09:34 +0530
Message-ID: <20190617173952.29363-10-mmaddireddy@nvidia.com> (raw)
In-Reply-To: <20190617173952.29363-1-mmaddireddy@nvidia.com>

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>
Acked-by: Thierry Reding <treding@nvidia.com>
---
V5: No change

V4: No change

V3: No change

V2: No change

 drivers/pci/controller/pci-tegra.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index c38a370ed853..51691252ca10 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -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)
-- 
2.17.1


  parent reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17 17:39 [PATCH V5 00/27] Enable Tegra PCIe root port features Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 01/27] soc/tegra: pmc: Export tegra_powergate_power_on() Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 02/27] PCI: tegra: Handle failure cases in tegra_pcie_power_on() Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 03/27] PCI: tegra: Rearrange Tegra PCIe driver functions Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 04/27] PCI: tegra: Mask AFI_INTR in runtime suspend Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 05/27] PCI: tegra: Fix PCIe host power up sequence Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 06/27] PCI: tegra: Add PCIe Gen2 link speed support Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 07/27] PCI: tegra: Advertise PCIe Advanced Error Reporting (AER) capability Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 08/27] PCI: tegra: Program UPHY electrical settings for Tegra210 Manikanta Maddireddy
2019-06-17 17:39 ` Manikanta Maddireddy [this message]
2019-06-17 17:39 ` [PATCH V5 10/27] PCI: tegra: Disable AFI dynamic clock gating Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 11/27] PCI: tegra: Process pending DLL transactions before entering L1 or L2 Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 12/27] PCI: tegra: Enable PCIe xclk clock clamping Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 13/27] PCI: tegra: Increase the deskew retry time Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 14/27] PCI: tegra: Add SW fixup for RAW violations Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 15/27] PCI: tegra: Update flow control timer frequency in Tegra210 Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 16/27] PCI: tegra: Set target speed as Gen1 before starting LTSSM Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 17/27] PCI: tegra: Fix PLLE power down issue due to CLKREQ# signal Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 18/27] PCI: tegra: Program AFI_CACHE* registers only for Tegra20 Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 19/27] PCI: tegra: Change PRSNT_SENSE IRQ log to debug Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 20/27] PCI: tegra: Use legacy IRQ for port service drivers Manikanta Maddireddy
2019-06-18  5:47   ` Manikanta Maddireddy
2019-06-18 13:35     ` Lorenzo Pieralisi
2019-06-17 17:39 ` [PATCH V5 21/27] PCI: tegra: Add AFI_PEX2_CTRL reg offset as part of soc struct Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 22/27] dt-bindings: pci: tegra: Document PCIe DPD pinctrl optional prop Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 23/27] arm64: tegra: Add PEX DPD states as pinctrl properties Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 24/27] PCI: tegra: Put PEX CLK & BIAS pads in DPD mode Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 25/27] PCI: Add DT binding for "reset-gpios" property Manikanta Maddireddy
2019-06-17 17:39 ` [PATCH V5 26/27] PCI: tegra: Add support for GPIO based PERST# Manikanta Maddireddy
2019-06-18 10:51   ` Thierry Reding
2019-06-17 17:39 ` [PATCH V5 27/27] PCI: tegra: Change link retry log level to debug Manikanta Maddireddy

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