1 /* 2 * Copyright 2015 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs <bskeggs@redhat.com> 23 */ 24 #include "priv.h" 25 26 #include <core/pci.h> 27 28 void 29 g84_pci_init(struct nvkm_pci *pci) 30 { 31 /* The following only concerns PCIe cards. */ 32 if (!pci_is_pcie(pci->pdev)) 33 return; 34 35 /* Tag field is 8-bit long, regardless of EXT_TAG. 36 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag 37 * field should be used, limiting the number of request to 32. 38 * 39 * Apparently, 0x041c stores some limit on the number of requests 40 * possible, so if EXT_TAG is disabled, limit that requests number to 41 * 32 42 * 43 * Fixes fdo#86537 44 */ 45 if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020) 46 nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100); 47 else 48 nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000); 49 } 50 51 static const struct nvkm_pci_func 52 g84_pci_func = { 53 .init = g84_pci_init, 54 .rd32 = nv40_pci_rd32, 55 .wr08 = nv40_pci_wr08, 56 .wr32 = nv40_pci_wr32, 57 .msi_rearm = nv46_pci_msi_rearm, 58 }; 59 60 int 61 g84_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci) 62 { 63 return nvkm_pci_new_(&g84_pci_func, device, index, ppci); 64 } 65