From: Lukas Wunner Date: Thu, 21 Sep 2023 14:23:34 +0000 (+0200) Subject: PCI: Lengthen reset delay for VideoPropulsion Torrent QN16e card X-Git-Tag: v6.6.7~695 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0b496b19ab669caf7739ec3f13730021e69730ec;p=platform%2Fkernel%2Flinux-starfive.git PCI: Lengthen reset delay for VideoPropulsion Torrent QN16e card commit c9260693aa0c1e029ed23693cfd4d7814eee6624 upstream. Commit ac91e6980563 ("PCI: Unify delay handling for reset and resume") shortened an unconditional 1 sec delay after a Secondary Bus Reset to 100 msec for PCIe (per PCIe r6.1 sec 6.6.1). The 1 sec delay is only required for Conventional PCI. But it turns out that there are PCIe devices which require a longer delay than prescribed before first config space access after reset recovery or resume from D3cold: Chad reports that a "VideoPropulsion Torrent QN16e" MPEG QAM Modulator "raises a PCI system error (PERR), as reported by the IPMI event log, and the hardware itself would suffer a catastrophic event, cycling the server" unless the longer delay is observed. The card is specified to conform to PCIe r1.0 and indeed only supports Gen1 speed (2.5 GT/s) according to lspci. PCIe r1.0 sec 7.6 prescribes the same 100 msec delay as PCIe r6.1 sec 6.6.1: To allow components to perform internal initialization, system software must wait for at least 100 ms from the end of a reset (cold/warm/hot) before it is permitted to issue Configuration Requests The behavior of the Torrent QN16e card thus appears to be a quirk. Treat it as such and lengthen the reset delay for this specific device. Fixes: ac91e6980563 ("PCI: Unify delay handling for reset and resume") Link: https://lore.kernel.org/r/47727e792c7f0282dc144e3ec8ce8eb6e713394e.1695304512.git.lukas@wunner.de Reported-by: Chad Schroeder Closes: https://lore.kernel.org/linux-pci/DM6PR16MB2844903E34CAB910082DF019B1FAA@DM6PR16MB2844.namprd16.prod.outlook.com/ Tested-by: Chad Schroeder Signed-off-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 3da1a04..ae95d09 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -6211,3 +6211,15 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a31, dpc_log_size); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5020, of_pci_make_dev_node); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5021, of_pci_make_dev_node); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_REDHAT, 0x0005, of_pci_make_dev_node); + +/* + * Devices known to require a longer delay before first config space access + * after reset recovery or resume from D3cold: + * + * VideoPropulsion (aka Genroco) Torrent QN16e MPEG QAM Modulator + */ +static void pci_fixup_d3cold_delay_1sec(struct pci_dev *pdev) +{ + pdev->d3cold_delay = 1000; +} +DECLARE_PCI_FIXUP_FINAL(0x5555, 0x0004, pci_fixup_d3cold_delay_1sec);