Commit 6aa9c09f authored by Thomas Richard's avatar Thomas Richard Committed by Krzysztof Wilczyński

PCI: Add T_PERST_CLK_US macro

The "Power Sequencing and Reset Signal Timings" table of the PCI
Express Card Electromechanical Specification, Revision 5.1, Section
2.9.2, 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.

Link: https://lore.kernel.org/linux-pci/20240102-j7200-pcie-s2r-v7-5-a2f9156da6c3@bootlin.comSigned-off-by: default avatarThomas Richard <thomas.richard@bootlin.com>
[kwilczynski: commit log, update sleep interval macros code comments]
Signed-off-by: default avatarKrzysztof Wilczyński <kwilczynski@kernel.org>
parent b8600b87
......@@ -13,9 +13,24 @@
#define PCIE_LINK_RETRAIN_TIMEOUT_MS 1000
/* Power stable to PERST# inactive from PCIe card Electromechanical Spec */
/*
* Power stable to PERST# inactive.
*
* See the "Power Sequencing and Reset Signal Timings" table of the PCI Express
* Card Electromechanical Specification, Revision 5.1, Section 2.9.2, Symbol
* "T_PVPERL".
*/
#define PCIE_T_PVPERL_MS 100
/*
* REFCLK stable before PERST# inactive.
*
* See the "Power Sequencing and Reset Signal Timings" table of the PCI Express
* Card Electromechanical Specification, Revision 5.1, Section 2.9.2, Symbol
* "T_PERST-CLK".
*/
#define PCIE_T_PERST_CLK_US 100
/*
* End of conventional reset (PERST# de-asserted) to first configuration
* request (device able to respond with a "Request Retry Status" completion),
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment