From patchwork Wed Jun 19 10:15:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13703603 X-Patchwork-Delegate: kw@linux.com Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net [217.70.183.196]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E088185626; Wed, 19 Jun 2024 10:15:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.196 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718792139; cv=none; b=R0o5gOGxtc4QygYyKEzMewG0EHYgAJRCe0rrGdRM6n0gbao8pMxNvjek8ORZB8PU9iyOmoOUQoltW8Ehu1aio2SLYzKA5fc8oZhJCPpVuC8bHri34AFgf5oHUJAgIUXvdW/aF/0j0BKG2SsK2xhiImJo7RinHyxtRT5oh5r6I2c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718792139; c=relaxed/simple; bh=Sa5xfEP1QjIlXJn5BNDwRNY81rwveOsBkeO/Op4FKsw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Z54uZLSt15NgIEImNkMMDFzJkJmbWMqvxuaIYE0+69HM8gjSd5uHzu0gXR1ZVtkEeY1bhFcKUw+9iVpzi7/K5tKHSk6IYnW4KEMMMKg4karZHB49hCpazX/zk4d/iuFYXD4SCE4I8TsLsj6Yp+GCZQ6Ib8Qfd447dgdkPGRSKXg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=GDnnH+jf; arc=none smtp.client-ip=217.70.183.196 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="GDnnH+jf" Received: by mail.gandi.net (Postfix) with ESMTPSA id 6F663E0006; Wed, 19 Jun 2024 10:15:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1718792129; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=IcIvJM/PVv8xQhULVlebx488rIln5blmKYSSLR0xIrs=; b=GDnnH+jf9b1CYJdycv9jbarLX53OM2TOHFTrLRm5e0lhyG6Axv32nP9xVPV+ikoyOTp5Y9 qWw6tMrSNWQdCPX4+x9cACZ2IwYSroD85JOHCwPASlr5ASryhhQ8VzXGdno7Njmd8Jaoh0 lZMKeXTj+VjIFoUEKch7SGjfkhOCB75v9wa4RWEDo2ebrvTc9bsvW7UDRIY459+NXoslj1 EErIFnVfmrQYErqQtpFoyWgOBKL5AZn3MMiX5QIJPpkfmUJmOPZll8MBMRNprQ0OVjBgrb e0KKicNZxu1r/ucXISo7LVXponxyP+u15y0RzWq9LUzLzr0OTao6idreVdDSvA== From: Thomas Richard Date: Wed, 19 Jun 2024 12:15:13 +0200 Subject: [PATCH v7 5/7] PCI: Add T_PERST_CLK_US macro Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v7-5-a2f9156da6c3@bootlin.com> References: <20240102-j7200-pcie-s2r-v7-0-a2f9156da6c3@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v7-0-a2f9156da6c3@bootlin.com> To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Vignesh Raghavendra , Siddharth Vadapalli Cc: gregory.clement@bootlin.com, theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Thomas Richard X-Mailer: b4 0.12.0 X-GND-Sasl: thomas.richard@bootlin.com "Power Sequencing and Reset Signal Timings" table (section 2.9.2) in PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 5.1 indicates PERST# should be deasserted after minimum of 100us once REFCLK is stable (symbol T_PERST-CLK). Add a macro so that PCIe controller drivers can use it. Signed-off-by: Thomas Richard --- drivers/pci/pci.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index fd44565c4756..1a11f2fe3efe 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -16,6 +16,9 @@ /* Power stable to PERST# inactive from PCIe card Electromechanical Spec */ #define PCIE_T_PVPERL_MS 100 +/* REFCLK stable before PERST# inactive from PCIe card Electromechanical Spec */ +#define PCIE_T_PERST_CLK_US 100 + /* * PCIe r6.0, sec 5.3.3.2.1 * Recommends 1ms to 10ms timeout to check L2 ready.