From nobody Sat Oct 4 00:31:34 2025 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.3]) by smtp.subspace.kernel.org (Postfix) with ESMTP id E5E2D2571B3; Fri, 22 Aug 2025 16:03:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.3 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755878590; cv=none; b=YPCeWhgu8j14WDfU5SlAy+zD7XO5JFgr/bwu9ubYXNb6lbY94wosvWX7CpgWTZR0YnLgiiy+HWSSomcCLqjNlpew3LpVsj0uyHSmkBv/lSzS7oZanNoKS+2pGX6pWIG9EZqJbEmyQR/2u5VmYz18igAvKGHOQ26A/EayQDHNhow= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755878590; c=relaxed/simple; bh=00uQLzBvw81h9DsR6NvprDhEKBbI4K9VDv6ya1BQZS0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=AKpM6MKzAm7xyrqowI6i2fsHtqnaLpxWldDaJKngVSu2R348I+RRJgzhi7u18DwiLMyjuDdRIFvb7qdpvDSVlKRmH/P8PaycLSGprPuwoDFzdriT0K4LfrVQktf3j4QJgxw7JMjIeQWz3GoUNBmDaWZ/MpwzfFco4s/lDQBMLME= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=mqJneMlC; arc=none smtp.client-ip=117.135.210.3 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="mqJneMlC" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=nY wBe0Gw4IJJQHEad3MsWbZtPAjCQRM88MR9DM/lef8=; b=mqJneMlCQm3YYpfNJI ui5bE7BQ9AjAimDzdxm5TBWRp0rXeZT6cYDJDsKdwJi56ApSSh9379qPgKHpTRK+ 6d4DGF2qJu9sMnpjab96EVPW5xZPBpDrr/Y2I+C/SpYqVT318IA8fyLFheGGB3lo hDTKElD/CCRVJHWZt2JLd9joQ= Received: from localhost.localdomain (unknown []) by gzsmtp4 (Coremail) with SMTP id PygvCgBnxDaplKho3jnHAA--.18200S7; Sat, 23 Aug 2025 00:02:53 +0800 (CST) From: Hans Zhang <18255117159@163.com> To: bhelgaas@google.com, helgaas@kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Hans Zhang <18255117159@163.com> Subject: [PATCH v2 5/7] PCI: rcar: Replace msleep(5) with usleep_range() for precise PHY ready checking Date: Fri, 22 Aug 2025 23:59:06 +0800 Message-Id: <20250822155908.625553-6-18255117159@163.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250822155908.625553-1-18255117159@163.com> References: <20250822155908.625553-1-18255117159@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: PygvCgBnxDaplKho3jnHAA--.18200S7 X-Coremail-Antispam: 1Uf129KBjvdXoW7GFyfGw1rAr1xKr47Kw4xXrb_yoWkJFbE93 WF9F17CrWDW34akF12yw4IqF9Yy3Wav3WUXa4FqryFyasxX348JryIvayUX395Gw4fGr13 tr1DAr48Jry7CjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sR_73ktUUUUU== X-CM-SenderInfo: rpryjkyvrrlimvzbiqqrwthudrp/1tbiQwKxo2iokINYxQACsf Content-Type: text/plain; charset="utf-8" The msleep(5) in rcar_pcie_wait_for_phyrdy() may sleep longer than intended due to timer granularity, which can cause unnecessary delays in PHY ready detection. Replace it with usleep_range() for a more precise delay of approximately 5ms. Signed-off-by: Hans Zhang <18255117159@163.com> --- drivers/pci/controller/pcie-rcar.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pc= ie-rcar.c index 7583699ef7b6..8d0f5a4a7fc0 100644 --- a/drivers/pci/controller/pcie-rcar.c +++ b/drivers/pci/controller/pcie-rcar.c @@ -11,6 +11,8 @@ =20 #include "pcie-rcar.h" =20 +#define PCIE_PHYRDY_CHECK_US 5000 + void rcar_pci_write_reg(struct rcar_pcie *pcie, u32 val, unsigned int reg) { writel(val, pcie->base + reg); @@ -39,7 +41,7 @@ int rcar_pcie_wait_for_phyrdy(struct rcar_pcie *pcie) if (rcar_pci_read_reg(pcie, PCIEPHYSR) & PHYRDY) return 0; =20 - msleep(5); + usleep_range(PCIE_PHYRDY_CHECK_US, PCIE_PHYRDY_CHECK_US + 100); } =20 return -ETIMEDOUT; --=20 2.25.1