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Message-Id: <20240102-j7200-pcie-s2r-v7-5-a2f9156da6c3@bootlin.com> Date: Wed, 19 Jun 2024 12:15:13 +0200 From: Thomas Richard <thomas.richard@...tlin.com> To: Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, Vignesh Raghavendra <vigneshr@...com>, Siddharth Vadapalli <s-vadapalli@...com> Cc: gregory.clement@...tlin.com, theo.lebrun@...tlin.com, thomas.petazzoni@...tlin.com, u-kumar1@...com, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Thomas Richard <thomas.richard@...tlin.com> Subject: [PATCH v7 5/7] PCI: Add T_PERST_CLK_US macro "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 <thomas.richard@...tlin.com> --- 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 <PME Synchronization> * Recommends 1ms to 10ms timeout to check L2 ready. -- 2.39.2
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