Tegra chips T210 and T186 support ASPM-L1 Substates (i.e. L1.1 and L1.2) This patch series - adds a generic API for root port controller drivers to override the default value of LTR L1.2 Threhold which otherwise comes from the same APIs weak implementation in aspm.c file - applies fixups to reflect correct capability values for T_cmrt (Common Mode Restore Time) and T_pwr_on (Power On) and adjusts counter values for 19.2 MHz of clk_m - applies fixup specific to T210 to avoid unnecessary wake ups from L1.2 state PCIe - ASPM L1 Sub States spec https://pcisig.com/sites/default/files/specification_documents/ECN_L1_PM_Substates_with_CLKREQ_31_May_2013_Rev10a.pdf Testing Done on T210 and T186 - ASPM-L1: Verified ASPM-L1 enablement by selecting PCIEASPM_POWERSAVE config With the help of Tegra rootport's internal counter registers, confirmed link entry in and out of ASPM-L1 state using USB3.0 add-on card, NVMe and NIC cards - ASPM-L1 SubStates: Verified ASPM-L1 Substates enablement by selecting PCIEASPM_POWER_SUPERSAVE config Confirmed link's entry into L1SS using Westren Digital NVMe card (with Sandisk Controller) using Tegra rootport's internal counter registers Vidya Sagar (4): PCI/ASPM: Add API to supply LTR L1.2 threshold PCI: tegra: Enable ASPM-L1 capability advertisement PCI: tegra: Apply sw fixups to support ASPM-L1 Sub-States PCI: tegra: fixups to avoid unnecessary wakeup from ASPM-L1.2 drivers/pci/host/pci-tegra.c | 99 ++++++++++++++++++++++++++++++++++++++++++++ drivers/pci/pcie/aspm.c | 11 +++-- include/linux/pci-aspm.h | 6 +++ 3 files changed, 113 insertions(+), 3 deletions(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
