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Wed, 14 Oct 2026 19:36:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 975291F000C4; Wed, 14 Oct 2026 19:36:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792006615; bh=Nwo7fummJ1+6uAUT8/LcA06d2mBN1HNQjSCHgbIgjcU=; h=Date:From:To:Cc:Subject:In-Reply-To; b=DVvcvc7UX80k12qRiHESe3D5qMFFVXrS38E48C9Buz1YyN3x0yyLjfN8PE2O8obfo z1EWyL8sTL4Zx59tmp6xOzDVuU7hCj2hbkXdM89M3tJdnXtlc9u49ZO+Lto+g3BsGu hsyH6xqZqSuHs9uSkr1db02NQdGYUUb5hKuZQNs6e0mShBs1+p9oLvNshC5gBtfnxU 5ICHjv7tO8lQQurcDTA1KP612gBPLumtixcyZjH0oDoeejT+40FVxVkP9zTNGRb27e QFXad8keYB8IZ/hC1pkcJr6OqlI6NaCTwLEk0M52Cn+ZuieNdgR4uXGSCl8QqcT2Fo xOB+33S6zENxQ== Date: Wed, 14 Oct 2026 14:36:54 -0500 From: Bjorn Helgaas To: vjardin@free.fr Cc: Minghuan Lian , Mingkai Hu , Roy Zang , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , Ioana Ciornei , Vladimir Oltean , linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] PCI: layerscape: async probe by default Message-ID: <20261014193654.GA1656473@bhelgaas> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260928-for-upstream-pci-layerscape-async-probe-v1-1-76412d887baa@free.fr> On Mon, Sep 28, 2026 at 03:48:09PM +0200, Vincent Jardin via B4 Relay wrote: > From: Vincent Jardin > > 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. "ls_pcie_driver_init" doesn't exist; I suppose this means dw_pcie_host_init()? > 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 > --- > 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 > >