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


Signed-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

drivers/pci/pci.h

+16 −1
Original line number Diff line number Diff line
@@ -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),