[PATCH v7 0/9] Enhancements to pcie-tegra194 driver

From: Manikanta Maddireddy

Date: Tue Mar 03 2026 - 02:00:03 EST


This series[1] was originally posted by Vidya Sagar, and I have rebased
it onto 6.19.0-rc6-next. I addressed review comments and split this into
two series, one for fixes and the other is for enhancements(current).
I verified these patches on Jetson AGX Orin(Tegra234 SoC).

Disabling L1SS capability based on support-clkreq device tree property
is moved to common DWC driver, so I reworked below patch to disable
just L1.2 capability on Tegra234 SoC.
- PCI: tegra194: Disable L1.2 capability of Tegra234 EP

I added below new patch to tune the ASPM parameters, commit message of the
patch has the details on the bug and fix.
- PCI: tegra194: Add ASPM L1 entrance latency config

I added more context in the commit message for below patch based on review
comment in V3.
- PCI: tegra194: Remove IRQF_ONESHOT flag during Endpoint interrupt registration

Rest of the patches are same as the original V3 series, just rebased them on
6.19.0-rc6-next and fixed minor comments.

Manikanta Maddireddy (1):
PCI: tegra194: Add ASPM L1 entrance latency config

Vidya Sagar (8):
PCI: tegra194: Drive CLKREQ# signal low explicitly
PCI: tegra194: Calibrate P2U for Endpoint mode
PCI: tegra194: Remove IRQF_ONESHOT flag during Endpoint interrupt
registration
PCI: tegra194: Enable DMA interrupt
PCI: tegra194: Enable hardware hot reset mode in Endpoint
PCI: tegra194: Disable L1.2 capability of Tegra234 EP
dt-bindings: PCI: tegra194: Add monitor clock support
PCI: tegra194: Add core monitor clock support

.../bindings/pci/nvidia,tegra194-pcie-ep.yaml | 6 +-
.../bindings/pci/nvidia,tegra194-pcie.yaml | 6 +-
drivers/pci/controller/dwc/pcie-tegra194.c | 67 ++++++++++++++++++-
3 files changed, 76 insertions(+), 3 deletions(-)

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2.34.1