From: Manikanta Maddireddy <mmaddireddy@nvidia.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>,
Krzysztof Wilczynski <kwilczynski@kernel.org>,
Manivannan Sadhasivam <mani@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
Rob Herring <robh@kernel.org>,
Thierry Reding <thierry.reding@kernel.org>,
Jon Hunter <jonathanh@nvidia.com>,
Kishon Vijay Abraham I <kishon@kernel.org>,
Frank Li <Frank.Li@kernel.org>, Vidya Sagar <vidyas@nvidia.com>,
Niklas Cassel <cassel@kernel.org>,
Koichiro Den <den@valinux.co.jp>,
Marco Crivellari <marco.crivellari@suse.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 04/11] PCI: tegra194: Do not skip no-link Root Port remove cleanup
Date: Fri, 16 Oct 2026 15:02:36 +0530 [thread overview]
Message-ID: <73ad252e-98ce-4ecf-b767-aa8ae7802d62@nvidia.com> (raw)
In-Reply-To: <179198766519.63727.17783665861059106121.b4-reply@b4>
On 14/10/26 7:51 pm, Manivannan Sadhasivam wrote:
> On 2026-09-23 12:52 +0530, Manikanta Maddireddy wrote:
>> tegra_pcie_config_rp() deinitializes the controller and disables runtime PM
>> when link training fails, then probe treats -ENOMEDIUM as success so the
>> driver can remain bound without a link.
>>
>
> What is the use of keeping the driver then? If the controller is deinitialized,
> the it can't do hotplug either.
>
> This patch is fine though.
>
> - Mani
This behaviour dates back to the original Tegra194 driver review. Bjorn
recommended decoupling host-bridge probe success from downstream link
state, so Root Ports remain accessible for enumeration/debugging and
possible hotplug. However, as you point out, deinitializing the
controller defeats those benefits. The existing no-link policy deserves
a separate review; this patch only fixes the cleanup skipped when
removing that already-bound driver.
Ref: https://lkml.indiana.edu/1907.2/06835.html
- Manikanta
--
nvpublic
next prev parent reply other threads:[~2026-10-16 9:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-23 7:22 [PATCH 00/11] PCI: tegra194: Fix EP and Root Port corner cases Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 01/11] PCI: tegra194: Propagate REFCLK select GPIO errors Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 02/11] PCI: tegra194: Check core reset deassertion Manikanta Maddireddy
2026-09-24 20:25 ` Andy Shevchenko
2026-09-28 5:45 ` Manikanta Maddireddy
2026-09-28 8:40 ` Andy Shevchenko
2026-09-23 7:22 ` [PATCH 03/11] PCI: tegra194: Fix Endpoint PERST# IRQ suspend race Manikanta Maddireddy
2026-10-14 14:14 ` Manivannan Sadhasivam
2026-10-16 9:25 ` Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 04/11] PCI: tegra194: Do not skip no-link Root Port remove cleanup Manikanta Maddireddy
2026-10-14 14:21 ` Manivannan Sadhasivam
2026-10-16 9:32 ` Manikanta Maddireddy [this message]
2026-09-23 7:22 ` [PATCH 05/11] PCI: tegra194: Check for 16 GT/s capability before programming Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 06/11] PCI: tegra194: Check for L1SS " Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 07/11] PCI: tegra194: Always disable Tegra234 Endpoint L1.2 Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 08/11] PCI: tegra194: Guard Endpoint PLL-off error path Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 09/11] PCI: tegra194: Balance core monitor clock on failures Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 10/11] PCI: tegra194: Fix Endpoint MSI/MSI-X numbering Manikanta Maddireddy
2026-09-23 13:32 ` Niklas Cassel
2026-09-28 5:48 ` Manikanta Maddireddy
2026-09-23 7:22 ` [PATCH 11/11] PCI: endpoint: test: Do not relocate fixed MSI-X tables Manikanta Maddireddy
2026-09-23 14:32 ` Niklas Cassel
2026-10-14 14:40 ` Manivannan Sadhasivam
2026-10-15 17:43 ` Koichiro Den
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