[RFC v1 13/18] PCI: layerscape: Allow asynchronous probing for background link training

From: Anand Moon <linux.amoon@gmail.com>
To: "Vignesh Raghavendra" <vigneshr@ti.com>,
	"Siddharth Vadapalli" <s-vadapalli@ti.com>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
	"Manivannan Sadhasivam" <mani@kernel.org>,
	"Rob Herring" <robh@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Jingoo Han" <jingoohan1@gmail.com>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Alim Akhtar" <alim.akhtar@samsung.com>,
	"Minghuan Lian" <minghuan.Lian@nxp.com>,
	"Mingkai Hu" <mingkai.hu@nxp.com>, "Roy Zang" <roy.zang@nxp.com>,
	"Yue Wang" <yue.wang@Amlogic.com>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Kevin Hilman" <khilman@baylibre.com>,
	"Jerome Brunet" <jbrunet@baylibre.com>,
	"Martin Blumenstingl" <martin.blumenstingl@googlemail.com>,
	"Jonathan Chocron" <jonnyc@amazon.com>,
	"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	"Jesper Nilsson" <jesper.nilsson@axis.com>,
	"Paul Walmsley" <pjw@kernel.org>,
	"Greentime Hu" <greentime.hu@sifive.com>,
	"Samuel Holland" <samuel.holland@sifive.com>,
	"Chuanhua Lei" <lchuanhua@maxlinear.com>,
	"Srikanth Thokala" <srikanth.thokala@intel.com>,
	"Xiaowei Song" <songxiaowei@hisilicon.com>,
	"Binghui Wang" <wangbinghui@hisilicon.com>,
	"Chen Wang" <unicorn_wang@outlook.com>,
	"Inochi Amaoto" <inochiama@gmail.com>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Jonathan Hunter" <jonathanh@nvidia.com>,
	"Kunihiko Hayashi" <hayashi.kunihiko@socionext.com>,
	"Masami Hiramatsu" <mhiramat@kernel.org>,
	"Nobuhiro Iwamatsu" <nobuhiro.iwamatsu.x90@mail.toshiba>,
	"Niklas Cassel" <cassel@kernel.org>,
	"Qianfeng Rong" <rongqianfeng@vivo.com>,
	"Jiri Slaby (SUSE)" <jirislaby@kernel.org>,
	"Koichiro Den" <den@valinux.co.jp>,
	"Hans Zhang" <18255117159@163.com>,
	"Thomas Gleixner" <tglx@kernel.org>,
	"Thippeswamy Havalige" <thippeswamy.havalige@amd.com>,
	"Sai Krishna Musham" <sai.krishna.musham@amd.com>,
	"Vidya Sagar" <vidyas@nvidia.com>,
	linux-omap@vger.kernel.org (open list:PCI DRIVER FOR TI
	DRA7XX/J721E),
	linux-pci@vger.kernel.org (open list:PCI DRIVER FOR TI
	DRA7XX/J721E),
	linux-arm-kernel@lists.infradead.org (moderated list:PCI DRIVER
	FOR TI DRA7XX/J721E), linux-kernel@vger.kernel.org (open list),
	linux-samsung-soc@vger.kernel.org (open list:PCI DRIVER FOR
	SAMSUNG EXYNOS),
	linuxppc-dev@lists.ozlabs.org (open list:PCI DRIVER FOR
	FREESCALE LAYERSCAPE),
	imx@lists.linux.dev (open list:PCI DRIVER FOR FREESCALE
	LAYERSCAPE),
	linux-amlogic@lists.infradead.org (open list:PCIE DRIVER FOR
	AMLOGIC MESON),
	linux-arm-kernel@axis.com (open list:PCIE DRIVER FOR AXIS ARTPEC),
	sophgo@lists.linux.dev (open list:SOPHGO DEVICETREES and DRIVERS),
	linux-tegra@vger.kernel.org (open list:TEGRA ARCHITECTURE
	SUPPORT),
	linux-riscv@lists.infradead.org (open list:SIFIVE
	DRIVERS:Keyword:fu[57]40)
Cc: Anand Moon <linux.amoon@gmail.com>
Subject: [RFC v1 13/18] PCI: layerscape: Allow asynchronous probing for background link training
Date: Wed,  4 Mar 2026 19:21:56 +0530	[thread overview]
Message-ID: <20260304140329.7089-14-linux.amoon@gmail.com> (raw)
In-Reply-To: <20260304140329.7089-1-linux.amoon@gmail.com>

Establishing a PCIe link can take a while, allow asynchronous probing so
that link establishment can happen in the background while other devices
are being probed.

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
 drivers/pci/controller/dwc/pci-layerscape.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index a44b5c256d6e..43a28d9ea7b0 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -410,6 +410,7 @@ static struct platform_driver ls_pcie_driver = {
 		.of_match_table = ls_pcie_of_match,
 		.suppress_bind_attrs = true,
 		.pm = &ls_pcie_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
 	},
 };
 builtin_platform_driver(ls_pcie_driver);
-- 
2.50.1

