cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/bios/dcb.c

/*
 * Copyright 2012 Red Hat Inc.
 *
 * 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: Ben Skeggs
 */
#include <subdev/bios.h>
#include <subdev/bios/dcb.h>


u16 dcb_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len) { struct nvkm_subdev *subdev = &bios->subdev; struct nvkm_device *device = subdev->device; u16 dcb = 0x0000; if (device->card_type > NV_04) dcb = nvbios_rd16(bios, 0x36); if (!dcb) { nvkm_warn(subdev, "DCB table not found\n"); return dcb; } *ver = nvbios_rd08(bios, dcb); if (*ver >= 0x42) { nvkm_warn(subdev, "DCB version 0x%02x unknown\n", *ver); return 0x0000; } else if (*ver >= 0x30) { if (nvbios_rd32(bios, dcb + 6) == 0x4edcbdcb) { *hdr = nvbios_rd08(bios, dcb + 1); *cnt = nvbios_rd08(bios, dcb + 2); *len = nvbios_rd08(bios, dcb + 3); return dcb; } } else if (*ver >= 0x20) { if (nvbios_rd32(bios, dcb + 4) == 0x4edcbdcb) { u16 i2c = nvbios_rd16(bios, dcb + 2); *hdr = 8; *cnt = (i2c - dcb) / 8; *len = 8; return dcb; } } else if (*ver >= 0x15) { if (!nvbios_memcmp(bios, dcb - 7, "DEV_REC", 7)) { u16 i2c = nvbios_rd16(bios, dcb + 2); *hdr = 4; *cnt = (i2c - dcb) / 10; *len = 10; return dcb; } } else { /* * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but * always has the same single (crt) entry, even when tv-out * present, so the conclusion is this version cannot really * be used. * * v1.2 tables (some NV6/10, and NV15+) normally have the * same 5 entries, which are not specific to the card and so * no use. * * v1.2 does have an I2C table that read_dcb_i2c_table can * handle, but cards exist (nv11 in #14821) with a bad i2c * table pointer, so use the indices parsed in * parse_bmp_structure. * * v1.1 (NV5+, maybe some NV4) is entirely unhelpful */ nvkm_debug(subdev, "DCB contains no useful data\n"); return 0x0000; } nvkm_warn(subdev, "DCB header validation failed\n"); return 0x0000; }

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Ben Skeggs32799.39%685.71%
Marcin Ślusarz20.61%114.29%
Total329100.00%7100.00%


u16 dcb_outp(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len) { u8 hdr, cnt; u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len); if (dcb && idx < cnt) return dcb + hdr + (idx * *len); return 0x0000; }

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Ben Skeggs67100.00%2100.00%
Total67100.00%2100.00%


static inline u16 dcb_outp_hasht(struct dcb_output *outp) { return (outp->extdev << 8) | (outp->location << 4) | outp->type; }

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Ben Skeggs33100.00%1100.00%
Total33100.00%1100.00%


static inline u16 dcb_outp_hashm(struct dcb_output *outp) { return (outp->heads << 8) | (outp->link << 6) | outp->or; }

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Ben Skeggs33100.00%1100.00%
Total33100.00%1100.00%


u16 dcb_outp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len, struct dcb_output *outp) { u16 dcb = dcb_outp(bios, idx, ver, len); memset(outp, 0x00, sizeof(*outp)); if (dcb) { if (*ver >= 0x20) { u32 conn = nvbios_rd32(bios, dcb + 0x00); outp->or = (conn & 0x0f000000) >> 24; outp->location = (conn & 0x00300000) >> 20; outp->bus = (conn & 0x000f0000) >> 16; outp->connector = (conn & 0x0000f000) >> 12; outp->heads = (conn & 0x00000f00) >> 8; outp->i2c_index = (conn & 0x000000f0) >> 4; outp->type = (conn & 0x0000000f); outp->link = 0; } else { dcb = 0x0000; } if (*ver >= 0x40) { u32 conf = nvbios_rd32(bios, dcb + 0x04); switch (outp->type) { case DCB_OUTPUT_DP: switch (conf & 0x00e00000) { case 0x00000000: /* 1.62 */ outp->dpconf.link_bw = 0x06; break; case 0x00200000: /* 2.7 */ outp->dpconf.link_bw = 0x0a; break; case 0x00400000: /* 5.4 */ outp->dpconf.link_bw = 0x14; break; case 0x00600000: /* 8.1 */ default: outp->dpconf.link_bw = 0x1e; break; } switch ((conf & 0x0f000000) >> 24) { case 0xf: case 0x4: outp->dpconf.link_nr = 4; break; case 0x3: case 0x2: outp->dpconf.link_nr = 2; break; case 0x1: default: outp->dpconf.link_nr = 1; break; } /* fall-through... */ case DCB_OUTPUT_TMDS: case DCB_OUTPUT_LVDS: outp->link = (conf & 0x00000030) >> 4; outp->sorconf.link = outp->link; /*XXX*/ outp->extdev = 0x00; if (outp->location != 0) outp->extdev = (conf & 0x0000ff00) >> 8; break; default: break; } } outp->hasht = dcb_outp_hasht(outp); outp->hashm = dcb_outp_hashm(outp); } return dcb; }

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Ben Skeggs403100.00%10100.00%
Total403100.00%10100.00%


u16 dcb_outp_match(struct nvkm_bios *bios, u16 type, u16 mask, u8 *ver, u8 *len, struct dcb_output *outp) { u16 dcb, idx = 0; while ((dcb = dcb_outp_parse(bios, idx++, ver, len, outp))) { if ((dcb_outp_hasht(outp) & 0x00ff) == (type & 0x00ff)) { if ((dcb_outp_hashm(outp) & mask) == mask) break; } } return dcb; }

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Ben Skeggs94100.00%3100.00%
Total94100.00%3100.00%


int dcb_outp_foreach(struct nvkm_bios *bios, void *data, int (*exec)(struct nvkm_bios *, void *, int, u16)) { int ret, idx = -1; u8 ver, len; u16 outp; while ((outp = dcb_outp(bios, ++idx, &ver, &len))) { if (nvbios_rd32(bios, outp) == 0x00000000) break; /* seen on an NV11 with DCB v1.5 */ if (nvbios_rd32(bios, outp) == 0xffffffff) break; /* seen on an NV17 with DCB v2.0 */ if (nvbios_rd08(bios, outp) == DCB_OUTPUT_UNUSED) continue; if (nvbios_rd08(bios, outp) == DCB_OUTPUT_EOL) break; ret = exec(bios, data, idx, outp); if (ret) return ret; } return 0; }

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Ben Skeggs143100.00%3100.00%
Total143100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Ben Skeggs110799.82%1392.86%
Marcin Ślusarz20.18%17.14%
Total1109100.00%14100.00%
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