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(unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wCnj6SIYApq2fikCA--.4779S8; Mon, 18 May 2026 08:42:58 +0800 (CST) From: Hans Zhang <18255117159@163.com> To: bhelgaas@google.com, lpieralisi@kernel.org, kwilczynski@kernel.org, mani@kernel.org, vigneshr@ti.com, jingoohan1@gmail.com, thomas.petazzoni@bootlin.com, ryder.lee@mediatek.com, claudiu.beznea.uj@bp.renesas.com, mpillai@cadence.com Cc: robh@kernel.org, s-vadapalli@ti.com, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, claudiu.beznea@tuxon.dev, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Hans Zhang <18255117159@163.com> Subject: [PATCH v4 6/7] PCI: mediatek-gen3: Add 100 ms delay after link up Date: Mon, 18 May 2026 08:42:45 +0800 Message-ID: <20260518004246.1384532-7-18255117159@163.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260518004246.1384532-1-18255117159@163.com> References: <20260518004246.1384532-1-18255117159@163.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID: _____wCnj6SIYApq2fikCA--.4779S8 X-Coremail-Antispam: 1Uf129KBjvdXoW7Jr4kWw4fAw18WF4rJF1kZrb_yoWkKrcE9a yxZFWfZayjkrySkFnayFyrZr9Yy3s7Wr10qF4fKF13Aa48urn0qr9avryDAF4kGw43tF12 yryqk3W8WrykCjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7xRKCJmDUUUUU== X-Originating-IP: [140.206.53.66] X-CM-SenderInfo: rpryjkyvrrlimvzbiqqrwthudrp/xtbCxBJZ-GoKYJIFsAAA3U X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260517_174337_424258_329391EE X-CRM114-Status: UNSURE ( 9.51 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The MediaTek Gen3 PCIe host driver lacks the required 100 ms delay after link training completes for speeds > 5.0 GT/s, as specified in PCIe r6.0 sec 6.6.1. The driver already stores max_link_speed (from the device tree). After mtk_pcie_startup_port() successfully brings up the link, call pci_host_common_link_train_delay() to comply with the specification. Signed-off-by: Hans Zhang <18255117159@163.com> --- drivers/pci/controller/pcie-mediatek-gen3.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c index b0accd828589..5abddec4e9be 100644 --- a/drivers/pci/controller/pcie-mediatek-gen3.c +++ b/drivers/pci/controller/pcie-mediatek-gen3.c @@ -30,6 +30,7 @@ #include #include +#include "pci-host-common.h" #include "../pci.h" #define PCIE_BASE_CFG_REG 0x14 @@ -570,6 +571,8 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie) goto err_power_down_device; } + pci_host_common_link_train_delay(pcie->max_link_speed); + return 0; err_power_down_device: -- 2.43.0