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Received: by smtp.zoho.eu with SMTPS id 1794257260723543.4215096609604; Mon, 9 Nov 2026 21:47:40 +0100 (CET) Date: Mon, 09 Nov 2026 22:47:39 +0200 From: Igor Velkov To: Bjorn Helgaas Cc: Shawn Lin , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Bjorn Helgaas , Heiko Stuebner , Rob Herring , linux-pci@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Igor Velkov Subject: Re: [PATCH] PCI: rockchip-host: Enable async probe by default Message-ID: <20261109204122.async-probe-reply@iav.lv> In-Reply-To: <20261109202202.GA265423@bhelgaas> References: <20261103-rockchip-pcie-async-v1-1-4dcadb94af64@iav.lv> <20261109202202.GA265423@bhelgaas> X-Archived-By: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261109_124749_580129_407D8962 X-CRM114-Status: GOOD ( 13.90 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" X-Spam-Status: No, score=-3.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Mon, Nov 09, 2026 at 02:22:02PM -0600, Bjorn Helgaas wrote: > I don't know what the SD card has to do with PCIe. Seems like there's > some SD issue, and making PCIe async happens to avoid it? Sounds > fragile to me. > > Other changes like c0e1eb441b1d justify it by allowing other drivers > to load in parallel to reduce boot time, which is a good reason. But > apparently here it makes a functional difference as well, which feels > sketchy. E.g., what other drivers need to use async probe to avoid > similar issues? You're right that the real problem is ordering: nothing makes dw_mmc wait for the RK3399 io-domain driver, which sets the 1.8 V level of the SD pins. [1] tried to add that dependency and was not merged. Async probe only stops this driver from holding the deferred-probe worker for ~0.7 s; any other slow probe in that window breaks UHS the same way. Is there a way to express this dependency that you would accept? [1] https://lore.kernel.org/all/20230904115816.1237684-1-s.hauer@pengutronix.de/ -- Igor Velkov _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip