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The PCI core uses a fixed 50ms timeout when waiting for VPD accesses to complete. When an access does not complete within this period, a warning is logged and an error returned to the caller. While this default timeout is valid for most hardware, some devices can experience longer access delays under certain circumstances. For example, one of the IBM CXL Flash devices can take up to ~120ms in a worst-case scenario. These types of devices can benefit from an extended timeout. To support devices with a longer access delay, increase the timeout in pci_vpd_wait() to 125ms. The PCI specification is silent with respect to VPD delays, therefore there is no concern for violating a threshold. Tested-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.