From: Vidya Sagar <vidyas@nvidia.com>
To: <treding@nvidia.com>, <bhelgaas@google.com>, <rajatja@google.com>,
<yinghai@kernel.org>, <david.daney@cavium.com>,
<Julia.Lawall@lip6.fr>
Cc: <linux-tegra@vger.kernel.org>, <linux-pci@vger.kernel.org>,
<kthota@nvidia.com>, <mmaddireddy@nvidia.com>,
<vidyas@nvidia.com>
Subject: [PATCH V2 0/4] Add ASPM-L1 Substates support for Tegra
Date: Tue, 31 Oct 2017 09:52:45 +0530 [thread overview]
Message-ID: <1509423769-10522-1-git-send-email-vidyas@nvidia.com> (raw)
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 | 1 +
3 files changed, 108 insertions(+), 3 deletions(-)
--
2.7.4
next reply other threads:[~2017-10-31 4:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-31 4:22 Vidya Sagar [this message]
2017-10-31 4:22 ` [PATCH V2 1/4] PCI/ASPM: Add API to supply LTR L1.2 threshold Vidya Sagar
2017-10-31 4:22 ` [PATCH V2 2/4] PCI: tegra: Enable ASPM-L1 capability advertisement Vidya Sagar
2017-10-31 4:22 ` [PATCH V2 3/4] PCI: tegra: Apply sw fixups to support ASPM-L1 Sub-States Vidya Sagar
2017-11-07 22:50 ` Bjorn Helgaas
2017-11-08 8:45 ` Vidya Sagar
2017-11-08 17:48 ` Bjorn Helgaas
2017-11-10 10:07 ` Vidya Sagar
2017-11-10 21:29 ` Bjorn Helgaas
2017-11-12 11:51 ` Vidya Sagar
2017-11-14 23:13 ` Bjorn Helgaas
2017-11-17 14:05 ` Vidya Sagar
2017-11-17 23:49 ` Bjorn Helgaas
2017-10-31 4:22 ` [PATCH V2 4/4] PCI: tegra: fixups to avoid unnecessary wakeup from ASPM-L1.2 Vidya Sagar
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