diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/pci/pcie.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/pci/pcie.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/pcie.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/pcie.c new file mode 100644 index 000000000000..b32954f5311e --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/pcie.c @@ -0,0 +1,165 @@ +/* + * Copyright 2015 Karol Herbst <nouveau@karolherbst.de> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Karol Herbst <git@karolherbst.de> + */ +#include "priv.h" + +static char *nvkm_pcie_speeds[] = { + "2.5GT/s", + "5.0GT/s", + "8.0GT/s", +}; + +static enum nvkm_pcie_speed +nvkm_pcie_speed(enum pci_bus_speed speed) +{ + switch (speed) { + case PCIE_SPEED_2_5GT: + return NVKM_PCIE_SPEED_2_5; + case PCIE_SPEED_5_0GT: + return NVKM_PCIE_SPEED_5_0; + case PCIE_SPEED_8_0GT: + return NVKM_PCIE_SPEED_8_0; + default: + /* XXX 0x16 is 8_0, assume 0x17 will be 16_0 for now */ + if (speed == 0x17) + return NVKM_PCIE_SPEED_8_0; + return -1; + } +} + +static int +nvkm_pcie_get_version(struct nvkm_pci *pci) +{ + if (!pci->func->pcie.version) + return -ENOSYS; + + return pci->func->pcie.version(pci); +} + +static int +nvkm_pcie_get_max_version(struct nvkm_pci *pci) +{ + if (!pci->func->pcie.version_supported) + return -ENOSYS; + + return pci->func->pcie.version_supported(pci); +} + +static int +nvkm_pcie_set_version(struct nvkm_pci *pci, int version) +{ + if (!pci->func->pcie.set_version) + return -ENOSYS; + + nvkm_trace(&pci->subdev, "set to version %i\n", version); + pci->func->pcie.set_version(pci, version); + return nvkm_pcie_get_version(pci); +} + +int +nvkm_pcie_oneinit(struct nvkm_pci *pci) +{ + if (pci->func->pcie.max_speed) + nvkm_debug(&pci->subdev, "pcie max speed: %s\n", + nvkm_pcie_speeds[pci->func->pcie.max_speed(pci)]); + return 0; +} + +int +nvkm_pcie_init(struct nvkm_pci *pci) +{ + struct nvkm_subdev *subdev = &pci->subdev; + int ret; + + /* raise pcie version first */ + ret = nvkm_pcie_get_version(pci); + if (ret > 0) { + int max_version = nvkm_pcie_get_max_version(pci); + if (max_version > 0 && max_version > ret) + ret = nvkm_pcie_set_version(pci, max_version); + + if (ret < max_version) + nvkm_error(subdev, "couldn't raise version: %i\n", ret); + } + + if (pci->func->pcie.init) + pci->func->pcie.init(pci); + + if (pci->pcie.speed != -1) + nvkm_pcie_set_link(pci, pci->pcie.speed, pci->pcie.width); + + return 0; +} + +int +nvkm_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width) +{ + struct nvkm_subdev *subdev = &pci->subdev; + enum nvkm_pcie_speed cur_speed, max_speed; + struct pci_bus *pbus; + int ret; + + if (pci || !pci_is_pcie(pci->pdev)) + return 0; + pbus = pci->pdev->bus; + + if (!pci->func->pcie.set_link) + return -ENOSYS; + + nvkm_trace(subdev, "requested %s\n", nvkm_pcie_speeds[speed]); + + if (pci->func->pcie.version(pci) < 2) { + nvkm_error(subdev, "setting link failed due to low version\n"); + return -ENODEV; + } + + cur_speed = pci->func->pcie.cur_speed(pci); + max_speed = min(nvkm_pcie_speed(pbus->max_bus_speed), + pci->func->pcie.max_speed(pci)); + + nvkm_trace(subdev, "current speed: %s\n", nvkm_pcie_speeds[cur_speed]); + + if (speed > max_speed) { + nvkm_debug(subdev, "%s not supported by bus or card, dropping" + "requested speed to %s", nvkm_pcie_speeds[speed], + nvkm_pcie_speeds[max_speed]); + speed = max_speed; + } + + pci->pcie.speed = speed; + pci->pcie.width = width; + + if (speed == cur_speed) { + nvkm_debug(subdev, "requested matches current speed\n"); + return speed; + } + + nvkm_debug(subdev, "set link to %s x%i\n", + nvkm_pcie_speeds[speed], width); + + ret = pci->func->pcie.set_link(pci, speed, width); + if (ret < 0) + nvkm_error(subdev, "setting link failed: %i\n", ret); + + return ret; +} |