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charset="utf-8" Program the Synopsys DesignWare PORT_AFR L1 entrance latency field from the optional aspm-l1-entry-delay-ns device tree property (nanoseconds). Convert delay to whole microseconds with ceiling division (DIV_ROUND_UP), then derive the 3-bit hw encoding as the minimum of order_base_2(us) and 7. If the property is not present or cannot be read, default to 7. Hardware encoding (PORT_AFR L1 entrance latency, bits 27:29): +--------------------------+----------+ | Advertised maximum | Code | +--------------------------+----------+ | Maximum of 1 us | 000b | +--------------------------+----------+ | Maximum of 2 us | 001b | +--------------------------+----------+ | Maximum of 4 us | 010b | +--------------------------+----------+ | Maximum of 8 us | 011b | +--------------------------+----------+ | Maximum of 16 us | 100b | +--------------------------+----------+ | Maximum of 32 us | 101b | +--------------------------+----------+ | Maximum of 64 us | 110b | +--------------------------+----------+ | Rest | 111b | +--------------------------+----------+ Signed-off-by: Manikanta Maddireddy --- V2: Fixed commit message as per review comments. V3: Fixed encoding to handle all cases per above table. drivers/pci/controller/dwc/pcie-tegra194.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/contr= oller/dwc/pcie-tegra194.c index 9dcfa194050e..5309a2f1356d 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -272,6 +272,7 @@ struct tegra_pcie_dw { u32 aspm_cmrt; u32 aspm_pwr_on_t; u32 aspm_l0s_enter_lat; + u32 aspm_l1_enter_lat; =20 struct regulator *pex_ctl_supply; struct regulator *slot_ctl_3v3; @@ -715,6 +716,8 @@ static void init_host_aspm(struct tegra_pcie_dw *pcie) val =3D dw_pcie_readl_dbi(pci, PCIE_PORT_AFR); val &=3D ~PORT_AFR_L0S_ENTRANCE_LAT_MASK; val |=3D (pcie->aspm_l0s_enter_lat << PORT_AFR_L0S_ENTRANCE_LAT_SHIFT); + val &=3D ~PORT_AFR_L1_ENTRANCE_LAT_MASK; + val |=3D (pcie->aspm_l1_enter_lat << PORT_AFR_L1_ENTRANCE_LAT_SHIFT); val |=3D PORT_AFR_ENTER_ASPM; dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val); } @@ -1115,6 +1118,7 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_d= w *pcie) { struct platform_device *pdev =3D to_platform_device(pcie->dev); struct device_node *np =3D pcie->dev->of_node; + u32 val; int ret; =20 pcie->dbi_res =3D platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi= "); @@ -1141,6 +1145,15 @@ static int tegra_pcie_dw_parse_dt(struct tegra_pcie_= dw *pcie) dev_info(pcie->dev, "Failed to read ASPM L0s Entrance latency: %d\n", ret); =20 + /* Default to max latency of 7. */ + pcie->aspm_l1_enter_lat =3D 7; + ret =3D of_property_read_u32(np, "aspm-l1-entry-delay-ns", &val); + if (!ret) { + u32 us =3D DIV_ROUND_UP(val, 1000); + + pcie->aspm_l1_enter_lat =3D min_t(u32, order_base_2(us), 7); + } + ret =3D of_property_read_u32(np, "num-lanes", &pcie->num_lanes); if (ret < 0) { dev_err(pcie->dev, "Failed to read num-lanes: %d\n", ret); --=20 2.34.1 From nobody Fri Jun 12 12:45:33 2026 Received: from CO1PR03CU002.outbound.protection.outlook.com (mail-westus2azon11010032.outbound.protection.outlook.com [52.101.46.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 996DC3E0257; 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charset="utf-8" The Tegra194 PCIe driver converts aspm-l1-entry-delay-ns to whole ms with ceiling division, then derives the Synopsys DesignWare PORT_AFR L1 entrance latency encoding as min(order_base_2(us), 7). The nanosecond values from the Fixes tag below round up to 4, 8, and 16 us, selecting PORT_AFR L1 entrance latency codes 2, 3, and 4 respectively. Raise the programmed latency so the PORT_AFR codes are 3 / 4 / 5 (8 / 16 / 32 us buckets) instead of 2 / 3 / 4 (4 / 8 / 16 us). - tegra194.dtsi: 4000 -> 8000 ns (all listed controllers) - tegra234.dtsi: 8000 -> 16000 ns (Root Port), 16000 -> 32000 ns (Endpoint) Fixes: d60ed99f1c9e ("arm64: tegra: Add aspm-l1-entry-delay-ns to PCIe node= s") Signed-off-by: Manikanta Maddireddy --- arch/arm64/boot/dts/nvidia/tegra194.dtsi | 18 ++++++------- arch/arm64/boot/dts/nvidia/tegra234.dtsi | 32 ++++++++++++------------ 2 files changed, 25 insertions(+), 25 deletions(-) diff --git a/arch/arm64/boot/dts/nvidia/tegra194.dtsi b/arch/arm64/boot/dts= /nvidia/tegra194.dtsi index 1d659454a6f9..7bbf0e892724 100644 --- a/arch/arm64/boot/dts/nvidia/tegra194.dtsi +++ b/arch/arm64/boot/dts/nvidia/tegra194.dtsi @@ -2382,7 +2382,7 @@ pcie@14100000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -2435,7 +2435,7 @@ pcie@14120000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -2488,7 +2488,7 @@ pcie@14140000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -2541,7 +2541,7 @@ pcie@14160000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -2587,7 +2587,7 @@ pcie-ep@14160000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 interconnects =3D <&mc TEGRA194_MEMORY_CLIENT_PCIE4R &emc>, <&mc TEGRA194_MEMORY_CLIENT_PCIE4W &emc>; @@ -2634,7 +2634,7 @@ pcie@14180000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -2680,7 +2680,7 @@ pcie-ep@14180000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 interconnects =3D <&mc TEGRA194_MEMORY_CLIENT_PCIE0R &emc>, <&mc TEGRA194_MEMORY_CLIENT_PCIE0W &emc>; @@ -2730,7 +2730,7 @@ pcie@141a0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -2779,7 +2779,7 @@ pcie-ep@141a0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <4000>; + aspm-l1-entry-delay-ns =3D <8000>; =20 interconnects =3D <&mc TEGRA194_MEMORY_CLIENT_PCIE5R &emc>, <&mc TEGRA194_MEMORY_CLIENT_PCIE5W &emc>; diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts= /nvidia/tegra234.dtsi index 75bb9a0ad027..8e0c51e496e2 100644 --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi @@ -4532,7 +4532,7 @@ pcie@140a0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -4587,7 +4587,7 @@ pcie@140c0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -4642,7 +4642,7 @@ pcie@140e0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -4689,7 +4689,7 @@ pcie-ep@140e0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <16000>; + aspm-l1-entry-delay-ns =3D <32000>; =20 interconnects =3D <&mc TEGRA234_MEMORY_CLIENT_PCIE10AR &emc>, <&mc TEGRA234_MEMORY_CLIENT_PCIE10AW &emc>; @@ -4738,7 +4738,7 @@ pcie@14100000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -4793,7 +4793,7 @@ pcie@14120000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -4848,7 +4848,7 @@ pcie@14140000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -4903,7 +4903,7 @@ pcie@14160000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -4945,7 +4945,7 @@ pcie-ep@14160000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <16000>; + aspm-l1-entry-delay-ns =3D <32000>; =20 interconnects =3D <&mc TEGRA234_MEMORY_CLIENT_PCIE4R &emc>, <&mc TEGRA234_MEMORY_CLIENT_PCIE4W &emc>; @@ -4992,7 +4992,7 @@ pcie@14180000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -5047,7 +5047,7 @@ pcie@141a0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -5094,7 +5094,7 @@ pcie-ep@141a0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <16000>; + aspm-l1-entry-delay-ns =3D <32000>; =20 interconnects =3D <&mc TEGRA234_MEMORY_CLIENT_PCIE5R &emc>, <&mc TEGRA234_MEMORY_CLIENT_PCIE5W &emc>; @@ -5143,7 +5143,7 @@ pcie@141c0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -5190,7 +5190,7 @@ pcie-ep@141c0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <16000>; + aspm-l1-entry-delay-ns =3D <32000>; =20 interconnects =3D <&mc TEGRA234_MEMORY_CLIENT_PCIE6AR &emc>, <&mc TEGRA234_MEMORY_CLIENT_PCIE6AW &emc>; @@ -5239,7 +5239,7 @@ pcie@141e0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <8000>; + aspm-l1-entry-delay-ns =3D <16000>; =20 bus-range =3D <0x0 0xff>; =20 @@ -5286,7 +5286,7 @@ pcie-ep@141e0000 { nvidia,aspm-cmrt-us =3D <60>; nvidia,aspm-pwr-on-t-us =3D <20>; nvidia,aspm-l0s-entrance-latency-us =3D <3>; - aspm-l1-entry-delay-ns =3D <16000>; + aspm-l1-entry-delay-ns =3D <32000>; =20 interconnects =3D <&mc TEGRA234_MEMORY_CLIENT_PCIE7AR &emc>, <&mc TEGRA234_MEMORY_CLIENT_PCIE7AW &emc>; --=20 2.34.1