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authorLukas Wunner <lukas@wunner.de>2023-09-21 17:23:34 +0300
committerBjorn Helgaas <bhelgaas@google.com>2023-09-28 21:10:31 +0300
commitc9260693aa0c1e029ed23693cfd4d7814eee6624 (patch)
treedd28d4b2e775293bc318bf1d404423ce40b70839 /drivers/pci/quirks.c
parent0bb80ecc33a8fb5a682236443c1e740d5c917d1d (diff)
downloadlinux-c9260693aa0c1e029ed23693cfd4d7814eee6624.tar.xz
PCI: Lengthen reset delay for VideoPropulsion Torrent QN16e card
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 <CSchroeder@sonifi.com> Closes: https://lore.kernel.org/linux-pci/DM6PR16MB2844903E34CAB910082DF019B1FAA@DM6PR16MB2844.namprd16.prod.outlook.com/ Tested-by: Chad Schroeder <CSchroeder@sonifi.com> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org # v5.4+
Diffstat (limited to 'drivers/pci/quirks.c')
-rw-r--r--drivers/pci/quirks.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index eeec1d6f9023..91a15d79c7c4 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6188,3 +6188,15 @@ 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);