[PATCH] PCI: layerscape: async probe by default

[PATCH] PCI: layerscape: async probe by default

[Vincent Jardin via B4 Relay]

From: Vincent Jardin <vjardin@free.fr>

dw_pcie_wait_for_link() polls for up to
  PCIE_LINK_WAIT_MAX_RETRIES x PCIE_LINK_WAIT_SLEEP_MS (10 x 90 ms)
per controller.

The controllers are probed one after the other, so, it leads to slow
boot time.

On an LX2160A board with 4 enabled controllers and no link on any
of them, ls_pcie_driver_init took almost 4s.

Probing the 4 in parallel allows to have it down to 1s.

The controllers are independent, other DWC based drivers are already
using async probing such as qcom, imx6, s32g, rcar-gen4 or stm32.

Signed-off-by: Vincent Jardin <vjardin@free.fr>
---
 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 14d6ac4fc53f..7f37a0537159 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -419,6 +419,7 @@ 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,
 	},
 };
 module_platform_driver(ls_pcie_driver);

---
base-commit: 94e8d4e94266bb9737a5963810a3f9365cb2f39d
change-id: 20260928-for-upstream-pci-layerscape-async-probe-084cae5d0907

Best regards,
-- 
Vincent Jardin <vjardin@free.fr>

Re: [PATCH] PCI: layerscape: async probe by default

[Frank Li]

On Mon, Sep 28, 2026 at 03:48:09PM +0200, Vincent Jardin via B4 Relay wrote:
> From: Vincent Jardin <vjardin@free.fr>
>
> dw_pcie_wait_for_link() polls for up to
>   PCIE_LINK_WAIT_MAX_RETRIES x PCIE_LINK_WAIT_SLEEP_MS (10 x 90 ms)
> per controller.
>
> The controllers are probed one after the other, so, it leads to slow
> boot time.
>
> On an LX2160A board with 4 enabled controllers and no link on any
> of them, ls_pcie_driver_init took almost 4s.
>
> Probing the 4 in parallel allows to have it down to 1s.
>
> The controllers are independent, other DWC based drivers are already
> using async probing such as qcom, imx6, s32g, rcar-gen4 or stm32.
>
> Signed-off-by: Vincent Jardin <vjardin@free.fr>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.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 14d6ac4fc53f..7f37a0537159 100644
> --- a/drivers/pci/controller/dwc/pci-layerscape.c
> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
> @@ -419,6 +419,7 @@ 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,
>  	},
>  };
>  module_platform_driver(ls_pcie_driver);
>
> ---
> base-commit: 94e8d4e94266bb9737a5963810a3f9365cb2f39d
> change-id: 20260928-for-upstream-pci-layerscape-async-probe-084cae5d0907
>
> Best regards,
> --
> Vincent Jardin <vjardin@free.fr>
>
>
>