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From: Thomas Richard <thomas.richard@bootlin.com>
To: "Linus Walleij" <linus.walleij@linaro.org>,
	"Bartosz Golaszewski" <brgl@bgdev.pl>,
	"Tony Lindgren" <tony@atomide.com>,
	"Aaro Koskinen" <aaro.koskinen@iki.fi>,
	"Janusz Krzysztofik" <jmkrzyszt@gmail.com>,
	"Vignesh R" <vigneshr@ti.com>,
	"Andi Shyti" <andi.shyti@kernel.org>,
	"Peter Rosin" <peda@axentia.se>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Rob Herring" <robh@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Siddharth Vadapalli" <s-vadapalli@ti.com>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	 linux-omap@vger.kernel.org, linux-i2c@vger.kernel.org,
	 linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	 gregory.clement@bootlin.com, theo.lebrun@bootlin.com,
	 thomas.petazzoni@bootlin.com, u-kumar1@ti.com,
	 Thomas Richard <thomas.richard@bootlin.com>
Subject: [PATCH v5 09/11] PCI: Add T_PERST_CLK_US macro
Date: Tue, 16 Apr 2024 15:29:58 +0200	[thread overview]
Message-ID: <20240102-j7200-pcie-s2r-v5-9-4b8c46711ded@bootlin.com> (raw)
In-Reply-To: <20240102-j7200-pcie-s2r-v5-0-4b8c46711ded@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 <thomas.richard@bootlin.com>
---
 drivers/pci/pci.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 17fed1846847..c47b1d3b5887 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


WARNING: multiple messages have this Message-ID (diff)
From: Thomas Richard <thomas.richard@bootlin.com>
To: "Linus Walleij" <linus.walleij@linaro.org>,
	"Bartosz Golaszewski" <brgl@bgdev.pl>,
	"Tony Lindgren" <tony@atomide.com>,
	"Aaro Koskinen" <aaro.koskinen@iki.fi>,
	"Janusz Krzysztofik" <jmkrzyszt@gmail.com>,
	"Vignesh R" <vigneshr@ti.com>,
	"Andi Shyti" <andi.shyti@kernel.org>,
	"Peter Rosin" <peda@axentia.se>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Rob Herring" <robh@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Siddharth Vadapalli" <s-vadapalli@ti.com>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	 linux-omap@vger.kernel.org, linux-i2c@vger.kernel.org,
	 linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	 gregory.clement@bootlin.com, theo.lebrun@bootlin.com,
	 thomas.petazzoni@bootlin.com, u-kumar1@ti.com,
	 Thomas Richard <thomas.richard@bootlin.com>
Subject: [PATCH v5 09/11] PCI: Add T_PERST_CLK_US macro
Date: Tue, 16 Apr 2024 15:29:58 +0200	[thread overview]
Message-ID: <20240102-j7200-pcie-s2r-v5-9-4b8c46711ded@bootlin.com> (raw)
In-Reply-To: <20240102-j7200-pcie-s2r-v5-0-4b8c46711ded@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 <thomas.richard@bootlin.com>
---
 drivers/pci/pci.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 17fed1846847..c47b1d3b5887 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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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2024-04-16 13:30 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-16 13:29 [PATCH v5 00/11] Add suspend to ram support for PCIe on J7200 Thomas Richard
2024-04-16 13:29 ` Thomas Richard
2024-04-16 13:29 ` [PATCH v5 01/11] gpio: pca953x: move suspend()/resume() to suspend_noirq()/resume_noirq() Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-23  9:42   ` Geert Uytterhoeven
2024-04-23  9:42     ` Geert Uytterhoeven
2024-04-23 10:34     ` Andy Shevchenko
2024-04-23 10:34       ` Andy Shevchenko
2024-04-23 10:53       ` Thomas Richard
2024-04-23 10:53         ` Thomas Richard
2024-04-23 15:31         ` Geert Uytterhoeven
2024-04-23 15:31           ` Geert Uytterhoeven
2024-04-16 13:29 ` [PATCH v5 02/11] i2c: omap: wakeup the controller during suspend() callback Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-19  8:47   ` Andi Shyti
2024-04-19  8:47     ` Andi Shyti
2024-04-22  9:40     ` Thomas Richard
2024-04-22  9:40       ` Thomas Richard
2024-04-22 19:44       ` Bjorn Helgaas
2024-04-22 19:44         ` Bjorn Helgaas
2024-04-24 10:24         ` Thomas Richard
2024-04-24 10:24           ` Thomas Richard
2024-04-16 13:29 ` [PATCH v5 03/11] mux: add mux_chip_resume() function Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-16 13:29 ` [PATCH v5 04/11] mux: mmio: add resume support Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-16 13:29 ` [PATCH v5 05/11] PCI: cadence: Extract link setup sequence from cdns_pcie_host_setup() Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-16 14:16   ` Dan Carpenter
2024-04-16 14:16     ` Dan Carpenter
2024-04-16 16:01     ` Thomas Richard
2024-04-16 16:01       ` Thomas Richard
2024-05-14 13:15     ` Thomas Richard
2024-05-14 13:15       ` Thomas Richard
2024-05-15  7:05       ` Dan Carpenter
2024-05-15  7:05         ` Dan Carpenter
2024-04-16 13:29 ` [PATCH v5 06/11] PCI: cadence: Set cdns_pcie_host_init() global Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-16 13:29 ` [PATCH v5 07/11] PCI: j721e: Use dev_err_probe() in the probe() function Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-16 13:29 ` [PATCH v5 08/11] PCI: j721e: Add reset GPIO to struct j721e_pcie Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-16 13:29 ` Thomas Richard [this message]
2024-04-16 13:29   ` [PATCH v5 09/11] PCI: Add T_PERST_CLK_US macro Thomas Richard
2024-04-16 13:29 ` [PATCH v5 10/11] PCI: j721e: Use " Thomas Richard
2024-04-16 13:29   ` Thomas Richard
2024-04-16 13:30 ` [PATCH v5 11/11] PCI: j721e: Add suspend and resume support Thomas Richard
2024-04-16 13:30   ` Thomas Richard

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