/*
* 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 = 0 x0000;
if (device->card_type > NV_04)
dcb = nvbios_rd16(bios, 0 x36);
if (!dcb) {
nvkm_warn(subdev, "DCB table not found\n" );
return dcb;
}
*ver = nvbios_rd08(bios, dcb);
if (*ver >= 0 x42) {
nvkm_warn(subdev, "DCB version 0x%02x unknown\n" , *ver);
return 0 x0000;
} else
if (*ver >= 0 x30) {
if (nvbios_rd32(bios, dcb + 6 ) == 0 x4edcbdcb) {
*hdr = nvbios_rd08(bios, dcb + 1 );
*cnt = nvbios_rd08(bios, dcb + 2 );
*len = nvbios_rd08(bios, dcb + 3 );
return dcb;
}
} else
if (*ver >= 0 x20) {
if (nvbios_rd32(bios, dcb + 4 ) == 0 x4edcbdcb) {
u16 i2c = nvbios_rd16(bios, dcb + 2 );
*hdr = 8 ;
*cnt = (i2c - dcb) / 8 ;
*len = 8 ;
return dcb;
}
} else
if (*ver >= 0 x15) {
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 0 x0000;
}
nvkm_warn(subdev, "DCB header validation failed\n" );
return 0 x0000;
}
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 0 x0000;
}
static inline u16
dcb_outp_hasht(struct dcb_output *outp)
{
return (outp->extdev << 8 ) | (outp->location << 4 ) | outp->type;
}
static inline u16
dcb_outp_hashm(struct dcb_output *outp)
{
return (outp->heads << 8 ) | (outp->link << 6 ) | outp->or ;
}
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, 0 x00, sizeof (*outp));
if (dcb) {
if (*ver >= 0 x20) {
u32 conn = nvbios_rd32(bios, dcb + 0 x00);
outp->or = (conn & 0 x0f000000) >> 24 ;
outp->location = (conn & 0 x00300000) >> 20 ;
outp->bus = (conn & 0 x000f0000) >> 16 ;
outp->connector = (conn & 0 x0000f000) >> 12 ;
outp->heads = (conn & 0 x00000f00) >> 8 ;
outp->i2c_index = (conn & 0 x000000f0) >> 4 ;
outp->type = (conn & 0 x0000000f);
outp->link = 0 ;
} else {
dcb = 0 x0000;
}
if (*ver >= 0 x40) {
u32 conf = nvbios_rd32(bios, dcb + 0 x04);
switch (outp->type) {
case DCB_OUTPUT_DP:
switch (conf & 0 x00e00000) {
case 0 x00000000: /* 1.62 */
outp->dpconf.link_bw = 0 x06;
break ;
case 0 x00200000: /* 2.7 */
outp->dpconf.link_bw = 0 x0a;
break ;
case 0 x00400000: /* 5.4 */
outp->dpconf.link_bw = 0 x14;
break ;
case 0 x00600000: /* 8.1 */
default :
outp->dpconf.link_bw = 0 x1e;
break ;
}
switch ((conf & 0 x0f000000) >> 24 ) {
case 0 xf:
case 0 x4:
outp->dpconf.link_nr = 4 ;
break ;
case 0 x3:
case 0 x2:
outp->dpconf.link_nr = 2 ;
break ;
case 0 x1:
default :
outp->dpconf.link_nr = 1 ;
break ;
}
fallthrough;
case DCB_OUTPUT_TMDS:
case DCB_OUTPUT_LVDS:
outp->link = (conf & 0 x00000030) >> 4 ;
outp->sorconf.link = outp->link; /*XXX*/
outp->extdev = 0 x00;
if (outp->location != 0 )
outp->extdev = (conf & 0 x0000ff00) >> 8 ;
break ;
default :
break ;
}
}
outp->hasht = dcb_outp_hasht(outp);
outp->hashm = dcb_outp_hashm(outp);
}
return dcb;
}
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) & 0 x00ff) == (type & 0 x00ff)) {
if ((dcb_outp_hashm(outp) & mask) == mask)
break ;
}
}
return dcb;
}
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) == 0 x00000000)
break ; /* seen on an NV11 with DCB v1.5 */
if (nvbios_rd32(bios, outp) == 0 xffffffff)
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 ;
}
Messung V0.5 in Prozent C=97 H=96 G=96
¤ Dauer der Verarbeitung: 0.14 Sekunden
(vorverarbeitet am 2026-10-06)
¤
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