--- /dev/null
+/*
+ * 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;
+}
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff