linux/drivers/gpu/drm/nouveau/nouveau_dp.c

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/*
* Copyright 2009 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 "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_i2c.h"
#include "nouveau_connector.h"
#include "nouveau_encoder.h"
/******************************************************************************
* aux channel util functions
*****************************************************************************/
#define AUX_DBG(fmt, args...) do { \
if (nouveau_reg_debug & NOUVEAU_REG_DEBUG_AUXCH) { \
NV_PRINTK(KERN_DEBUG, dev, "AUXCH(%d): " fmt, ch, ##args); \
} \
} while (0)
#define AUX_ERR(fmt, args...) NV_ERROR(dev, "AUXCH(%d): " fmt, ch, ##args)
static void
auxch_fini(struct drm_device *dev, int ch)
{
nv_mask(dev, 0x00e4e4 + (ch * 0x50), 0x00310000, 0x00000000);
}
static int
auxch_init(struct drm_device *dev, int ch)
{
const u32 unksel = 1; /* nfi which to use, or if it matters.. */
const u32 ureq = unksel ? 0x00100000 : 0x00200000;
const u32 urep = unksel ? 0x01000000 : 0x02000000;
u32 ctrl, timeout;
/* wait up to 1ms for any previous transaction to be done... */
timeout = 1000;
do {
ctrl = nv_rd32(dev, 0x00e4e4 + (ch * 0x50));
udelay(1);
if (!timeout--) {
AUX_ERR("begin idle timeout 0x%08x", ctrl);
return -EBUSY;
}
} while (ctrl & 0x03010000);
/* set some magic, and wait up to 1ms for it to appear */
nv_mask(dev, 0x00e4e4 + (ch * 0x50), 0x00300000, ureq);
timeout = 1000;
do {
ctrl = nv_rd32(dev, 0x00e4e4 + (ch * 0x50));
udelay(1);
if (!timeout--) {
AUX_ERR("magic wait 0x%08x\n", ctrl);
auxch_fini(dev, ch);
return -EBUSY;
}
} while ((ctrl & 0x03000000) != urep);
return 0;
}
static int
auxch_tx(struct drm_device *dev, int ch, u8 type, u32 addr, u8 *data, u8 size)
{
u32 ctrl, stat, timeout, retries;
u32 xbuf[4] = {};
int ret, i;
AUX_DBG("%d: 0x%08x %d\n", type, addr, size);
ret = auxch_init(dev, ch);
if (ret)
goto out;
stat = nv_rd32(dev, 0x00e4e8 + (ch * 0x50));
if (!(stat & 0x10000000)) {
AUX_DBG("sink not detected\n");
ret = -ENXIO;
goto out;
}
if (!(type & 1)) {
memcpy(xbuf, data, size);
for (i = 0; i < 16; i += 4) {
AUX_DBG("wr 0x%08x\n", xbuf[i / 4]);
nv_wr32(dev, 0x00e4c0 + (ch * 0x50) + i, xbuf[i / 4]);
}
}
ctrl = nv_rd32(dev, 0x00e4e4 + (ch * 0x50));
ctrl &= ~0x0001f0ff;
ctrl |= type << 12;
ctrl |= size - 1;
nv_wr32(dev, 0x00e4e0 + (ch * 0x50), addr);
/* retry transaction a number of times on failure... */
ret = -EREMOTEIO;
for (retries = 0; retries < 32; retries++) {
/* reset, and delay a while if this is a retry */
nv_wr32(dev, 0x00e4e4 + (ch * 0x50), 0x80000000 | ctrl);
nv_wr32(dev, 0x00e4e4 + (ch * 0x50), 0x00000000 | ctrl);
if (retries)
udelay(400);
/* transaction request, wait up to 1ms for it to complete */
nv_wr32(dev, 0x00e4e4 + (ch * 0x50), 0x00010000 | ctrl);
timeout = 1000;
do {
ctrl = nv_rd32(dev, 0x00e4e4 + (ch * 0x50));
udelay(1);
if (!timeout--) {
AUX_ERR("tx req timeout 0x%08x\n", ctrl);
goto out;
}
} while (ctrl & 0x00010000);
/* read status, and check if transaction completed ok */
stat = nv_mask(dev, 0x00e4e8 + (ch * 0x50), 0, 0);
if (!(stat & 0x000f0f00)) {
ret = 0;
break;
}
AUX_DBG("%02d 0x%08x 0x%08x\n", retries, ctrl, stat);
}
if (type & 1) {
for (i = 0; i < 16; i += 4) {
xbuf[i / 4] = nv_rd32(dev, 0x00e4d0 + (ch * 0x50) + i);
AUX_DBG("rd 0x%08x\n", xbuf[i / 4]);
}
memcpy(data, xbuf, size);
}
out:
auxch_fini(dev, ch);
return ret;
}
static int
auxch_rd(struct drm_encoder *encoder, int address, uint8_t *buf, int size)
{
struct drm_device *dev = encoder->dev;
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct nouveau_i2c_chan *auxch;
int ret;
auxch = nouveau_i2c_find(dev, nv_encoder->dcb->i2c_index);
if (!auxch)
return -ENODEV;
ret = nouveau_dp_auxch(auxch, 9, address, buf, size);
if (ret)
return ret;
return 0;
}
static int
auxch_wr(struct drm_encoder *encoder, int address, uint8_t *buf, int size)
{
struct drm_device *dev = encoder->dev;
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct nouveau_i2c_chan *auxch;
int ret;
auxch = nouveau_i2c_find(dev, nv_encoder->dcb->i2c_index);
if (!auxch)
return -ENODEV;
ret = nouveau_dp_auxch(auxch, 8, address, buf, size);
return ret;
}
static u32
dp_link_bw_get(struct drm_device *dev, int or, int link)
{
u32 ctrl = nv_rd32(dev, 0x614300 + (or * 0x800));
if (!(ctrl & 0x000c0000))
return 162000;
return 270000;
}
static int
dp_lane_count_get(struct drm_device *dev, int or, int link)
{
u32 ctrl = nv_rd32(dev, NV50_SOR_DP_CTRL(or, link));
switch (ctrl & 0x000f0000) {
case 0x00010000: return 1;
case 0x00030000: return 2;
default:
return 4;
}
}
void
nouveau_dp_tu_update(struct drm_device *dev, int or, int link, u32 clk, u32 bpp)
{
const u32 symbol = 100000;
int bestTU = 0, bestVTUi = 0, bestVTUf = 0, bestVTUa = 0;
int TU, VTUi, VTUf, VTUa;
u64 link_data_rate, link_ratio, unk;
u32 best_diff = 64 * symbol;
u32 link_nr, link_bw, r;
/* calculate packed data rate for each lane */
link_nr = dp_lane_count_get(dev, or, link);
link_data_rate = (clk * bpp / 8) / link_nr;
/* calculate ratio of packed data rate to link symbol rate */
link_bw = dp_link_bw_get(dev, or, link);
link_ratio = link_data_rate * symbol;
r = do_div(link_ratio, link_bw);
for (TU = 64; TU >= 32; TU--) {
/* calculate average number of valid symbols in each TU */
u32 tu_valid = link_ratio * TU;
u32 calc, diff;
/* find a hw representation for the fraction.. */
VTUi = tu_valid / symbol;
calc = VTUi * symbol;
diff = tu_valid - calc;
if (diff) {
if (diff >= (symbol / 2)) {
VTUf = symbol / (symbol - diff);
if (symbol - (VTUf * diff))
VTUf++;
if (VTUf <= 15) {
VTUa = 1;
calc += symbol - (symbol / VTUf);
} else {
VTUa = 0;
VTUf = 1;
calc += symbol;
}
} else {
VTUa = 0;
VTUf = min((int)(symbol / diff), 15);
calc += symbol / VTUf;
}
diff = calc - tu_valid;
} else {
/* no remainder, but the hw doesn't like the fractional
* part to be zero. decrement the integer part and
* have the fraction add a whole symbol back
*/
VTUa = 0;
VTUf = 1;
VTUi--;
}
if (diff < best_diff) {
best_diff = diff;
bestTU = TU;
bestVTUa = VTUa;
bestVTUf = VTUf;
bestVTUi = VTUi;
if (diff == 0)
break;
}
}
if (!bestTU) {
NV_ERROR(dev, "DP: unable to find suitable config\n");
return;
}
/* XXX close to vbios numbers, but not right */
unk = (symbol - link_ratio) * bestTU;
unk *= link_ratio;
r = do_div(unk, symbol);
r = do_div(unk, symbol);
unk += 6;
nv_mask(dev, NV50_SOR_DP_CTRL(or, link), 0x000001fc, bestTU << 2);
nv_mask(dev, NV50_SOR_DP_SCFG(or, link), 0x010f7f3f, bestVTUa << 24 |
bestVTUf << 16 |
bestVTUi << 8 |
unk);
}
static int
nouveau_dp_lane_count_set(struct drm_encoder *encoder, uint8_t cmd)
{
struct drm_device *dev = encoder->dev;
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
uint32_t tmp;
int or = nv_encoder->or, link = !(nv_encoder->dcb->sorconf.link & 1);
tmp = nv_rd32(dev, NV50_SOR_DP_CTRL(or, link));
tmp &= ~(NV50_SOR_DP_CTRL_ENHANCED_FRAME_ENABLED |
NV50_SOR_DP_CTRL_LANE_MASK);
tmp |= ((1 << (cmd & DP_LANE_COUNT_MASK)) - 1) << 16;
if (cmd & DP_LANE_COUNT_ENHANCED_FRAME_EN)
tmp |= NV50_SOR_DP_CTRL_ENHANCED_FRAME_ENABLED;
nv_wr32(dev, NV50_SOR_DP_CTRL(or, link), tmp);
return auxch_wr(encoder, DP_LANE_COUNT_SET, &cmd, 1);
}
static int
nouveau_dp_link_bw_set(struct drm_encoder *encoder, uint8_t cmd)
{
struct drm_device *dev = encoder->dev;
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
uint32_t tmp;
int reg = 0x614300 + (nv_encoder->or * 0x800);
tmp = nv_rd32(dev, reg);
tmp &= 0xfff3ffff;
if (cmd == DP_LINK_BW_2_7)
tmp |= 0x00040000;
nv_wr32(dev, reg, tmp);
return auxch_wr(encoder, DP_LINK_BW_SET, &cmd, 1);
}
static int
nouveau_dp_link_train_set(struct drm_encoder *encoder, int pattern)
{
struct drm_device *dev = encoder->dev;
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
uint32_t tmp;
uint8_t cmd;
int or = nv_encoder->or, link = !(nv_encoder->dcb->sorconf.link & 1);
int ret;
tmp = nv_rd32(dev, NV50_SOR_DP_CTRL(or, link));
tmp &= ~NV50_SOR_DP_CTRL_TRAINING_PATTERN;
tmp |= (pattern << 24);
nv_wr32(dev, NV50_SOR_DP_CTRL(or, link), tmp);
ret = auxch_rd(encoder, DP_TRAINING_PATTERN_SET, &cmd, 1);
if (ret)
return ret;
cmd &= ~DP_TRAINING_PATTERN_MASK;
cmd |= (pattern & DP_TRAINING_PATTERN_MASK);
return auxch_wr(encoder, DP_TRAINING_PATTERN_SET, &cmd, 1);
}
static int
nouveau_dp_max_voltage_swing(struct drm_encoder *encoder)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct drm_device *dev = encoder->dev;
struct bit_displayport_encoder_table_entry *dpse;
struct bit_displayport_encoder_table *dpe;
int i, dpe_headerlen, max_vs = 0;
dpe = nouveau_bios_dp_table(dev, nv_encoder->dcb, &dpe_headerlen);
if (!dpe)
return false;
dpse = (void *)((char *)dpe + dpe_headerlen);
for (i = 0; i < dpe_headerlen; i++, dpse++) {
if (dpse->vs_level > max_vs)
max_vs = dpse->vs_level;
}
return max_vs;
}
static int
nouveau_dp_max_pre_emphasis(struct drm_encoder *encoder, int vs)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct drm_device *dev = encoder->dev;
struct bit_displayport_encoder_table_entry *dpse;
struct bit_displayport_encoder_table *dpe;
int i, dpe_headerlen, max_pre = 0;
dpe = nouveau_bios_dp_table(dev, nv_encoder->dcb, &dpe_headerlen);
if (!dpe)
return false;
dpse = (void *)((char *)dpe + dpe_headerlen);
for (i = 0; i < dpe_headerlen; i++, dpse++) {
if (dpse->vs_level != vs)
continue;
if (dpse->pre_level > max_pre)
max_pre = dpse->pre_level;
}
return max_pre;
}
static bool
nouveau_dp_link_train_adjust(struct drm_encoder *encoder, uint8_t *config)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct drm_device *dev = encoder->dev;
struct bit_displayport_encoder_table *dpe;
int ret, i, dpe_headerlen, vs = 0, pre = 0;
uint8_t request[2];
dpe = nouveau_bios_dp_table(dev, nv_encoder->dcb, &dpe_headerlen);
if (!dpe)
return false;
ret = auxch_rd(encoder, DP_ADJUST_REQUEST_LANE0_1, request, 2);
if (ret)
return false;
NV_DEBUG_KMS(dev, "\t\tadjust 0x%02x 0x%02x\n", request[0], request[1]);
/* Keep all lanes at the same level.. */
for (i = 0; i < nv_encoder->dp.link_nr; i++) {
int lane_req = (request[i >> 1] >> ((i & 1) << 2)) & 0xf;
int lane_vs = lane_req & 3;
int lane_pre = (lane_req >> 2) & 3;
if (lane_vs > vs)
vs = lane_vs;
if (lane_pre > pre)
pre = lane_pre;
}
if (vs >= nouveau_dp_max_voltage_swing(encoder)) {
vs = nouveau_dp_max_voltage_swing(encoder);
vs |= 4;
}
if (pre >= nouveau_dp_max_pre_emphasis(encoder, vs & 3)) {
pre = nouveau_dp_max_pre_emphasis(encoder, vs & 3);
pre |= 4;
}
/* Update the configuration for all lanes.. */
for (i = 0; i < nv_encoder->dp.link_nr; i++)
config[i] = (pre << 3) | vs;
return true;
}
static bool
nouveau_dp_link_train_commit(struct drm_encoder *encoder, uint8_t *config)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct drm_device *dev = encoder->dev;
struct bit_displayport_encoder_table_entry *dpse;
struct bit_displayport_encoder_table *dpe;
int or = nv_encoder->or, link = !(nv_encoder->dcb->sorconf.link & 1);
int dpe_headerlen, ret, i;
NV_DEBUG_KMS(dev, "\t\tconfig 0x%02x 0x%02x 0x%02x 0x%02x\n",
config[0], config[1], config[2], config[3]);
dpe = nouveau_bios_dp_table(dev, nv_encoder->dcb, &dpe_headerlen);
if (!dpe)
return false;
dpse = (void *)((char *)dpe + dpe_headerlen);
for (i = 0; i < dpe->record_nr; i++, dpse++) {
if (dpse->vs_level == (config[0] & 3) &&
dpse->pre_level == ((config[0] >> 3) & 3))
break;
}
BUG_ON(i == dpe->record_nr);
for (i = 0; i < nv_encoder->dp.link_nr; i++) {
const int shift[4] = { 16, 8, 0, 24 };
uint32_t mask = 0xff << shift[i];
uint32_t reg0, reg1, reg2;
reg0 = nv_rd32(dev, NV50_SOR_DP_UNK118(or, link)) & ~mask;
reg0 |= (dpse->reg0 << shift[i]);
reg1 = nv_rd32(dev, NV50_SOR_DP_UNK120(or, link)) & ~mask;
reg1 |= (dpse->reg1 << shift[i]);
reg2 = nv_rd32(dev, NV50_SOR_DP_UNK130(or, link)) & 0xffff00ff;
reg2 |= (dpse->reg2 << 8);
nv_wr32(dev, NV50_SOR_DP_UNK118(or, link), reg0);
nv_wr32(dev, NV50_SOR_DP_UNK120(or, link), reg1);
nv_wr32(dev, NV50_SOR_DP_UNK130(or, link), reg2);
}
ret = auxch_wr(encoder, DP_TRAINING_LANE0_SET, config, 4);
if (ret)
return false;
return true;
}
bool
nouveau_dp_link_train(struct drm_encoder *encoder, u32 datarate)
{
struct drm_device *dev = encoder->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct nouveau_connector *nv_connector;
struct bit_displayport_encoder_table *dpe;
int dpe_headerlen;
uint8_t config[4], status[3];
bool cr_done, cr_max_vs, eq_done, hpd_state;
int ret = 0, i, tries, voltage;
NV_DEBUG_KMS(dev, "link training!!\n");
nv_connector = nouveau_encoder_connector_get(nv_encoder);
if (!nv_connector)
return false;
dpe = nouveau_bios_dp_table(dev, nv_encoder->dcb, &dpe_headerlen);
if (!dpe) {
NV_ERROR(dev, "SOR-%d: no DP encoder table!\n", nv_encoder->or);
return false;
}
/* disable hotplug detect, this flips around on some panels during
* link training.
*/
hpd_state = pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, false);
if (dpe->script0) {
NV_DEBUG_KMS(dev, "SOR-%d: running DP script 0\n", nv_encoder->or);
nouveau_bios_run_init_table(dev, le16_to_cpu(dpe->script0),
nv_encoder->dcb, -1);
}
train:
cr_done = eq_done = false;
/* set link configuration */
NV_DEBUG_KMS(dev, "\tbegin train: bw %d, lanes %d\n",
nv_encoder->dp.link_bw, nv_encoder->dp.link_nr);
ret = nouveau_dp_link_bw_set(encoder, nv_encoder->dp.link_bw);
if (ret)
return false;
config[0] = nv_encoder->dp.link_nr;
if (nv_encoder->dp.dpcd_version >= 0x11 &&
nv_encoder->dp.enhanced_frame)
config[0] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
ret = nouveau_dp_lane_count_set(encoder, config[0]);
if (ret)
return false;
/* clock recovery */
NV_DEBUG_KMS(dev, "\tbegin cr\n");
ret = nouveau_dp_link_train_set(encoder, DP_TRAINING_PATTERN_1);
if (ret)
goto stop;
tries = 0;
voltage = -1;
memset(config, 0x00, sizeof(config));
for (;;) {
if (!nouveau_dp_link_train_commit(encoder, config))
break;
udelay(100);
ret = auxch_rd(encoder, DP_LANE0_1_STATUS, status, 2);
if (ret)
break;
NV_DEBUG_KMS(dev, "\t\tstatus: 0x%02x 0x%02x\n",
status[0], status[1]);
cr_done = true;
cr_max_vs = false;
for (i = 0; i < nv_encoder->dp.link_nr; i++) {
int lane = (status[i >> 1] >> ((i & 1) * 4)) & 0xf;
if (!(lane & DP_LANE_CR_DONE)) {
cr_done = false;
if (config[i] & DP_TRAIN_MAX_PRE_EMPHASIS_REACHED)
cr_max_vs = true;
break;
}
}
if ((config[0] & DP_TRAIN_VOLTAGE_SWING_MASK) != voltage) {
voltage = config[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
tries = 0;
}
if (cr_done || cr_max_vs || (++tries == 5))
break;
if (!nouveau_dp_link_train_adjust(encoder, config))
break;
}
if (!cr_done)
goto stop;
/* channel equalisation */
NV_DEBUG_KMS(dev, "\tbegin eq\n");
ret = nouveau_dp_link_train_set(encoder, DP_TRAINING_PATTERN_2);
if (ret)
goto stop;
for (tries = 0; tries <= 5; tries++) {
udelay(400);
ret = auxch_rd(encoder, DP_LANE0_1_STATUS, status, 3);
if (ret)
break;
NV_DEBUG_KMS(dev, "\t\tstatus: 0x%02x 0x%02x\n",
status[0], status[1]);
eq_done = true;
if (!(status[2] & DP_INTERLANE_ALIGN_DONE))
eq_done = false;
for (i = 0; eq_done && i < nv_encoder->dp.link_nr; i++) {
int lane = (status[i >> 1] >> ((i & 1) * 4)) & 0xf;
if (!(lane & DP_LANE_CR_DONE)) {
cr_done = false;
break;
}
if (!(lane & DP_LANE_CHANNEL_EQ_DONE) ||
!(lane & DP_LANE_SYMBOL_LOCKED)) {
eq_done = false;
break;
}
}
if (eq_done || !cr_done)
break;
if (!nouveau_dp_link_train_adjust(encoder, config) ||
!nouveau_dp_link_train_commit(encoder, config))
break;
}
stop:
/* end link training */
ret = nouveau_dp_link_train_set(encoder, DP_TRAINING_PATTERN_DISABLE);
if (ret)
return false;
/* retry at a lower setting, if possible */
if (!ret && !(eq_done && cr_done)) {
NV_DEBUG_KMS(dev, "\twe failed\n");
if (nv_encoder->dp.link_bw != DP_LINK_BW_1_62) {
NV_DEBUG_KMS(dev, "retry link training at low rate\n");
nv_encoder->dp.link_bw = DP_LINK_BW_1_62;
goto train;
}
}
if (dpe->script1) {
NV_DEBUG_KMS(dev, "SOR-%d: running DP script 1\n", nv_encoder->or);
nouveau_bios_run_init_table(dev, le16_to_cpu(dpe->script1),
nv_encoder->dcb, -1);
}
/* re-enable hotplug detect */
pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, hpd_state);
return eq_done;
}
bool
nouveau_dp_detect(struct drm_encoder *encoder)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct drm_device *dev = encoder->dev;
uint8_t dpcd[4];
int ret;
ret = auxch_rd(encoder, 0x0000, dpcd, 4);
if (ret)
return false;
NV_DEBUG_KMS(dev, "encoder: link_bw %d, link_nr %d\n"
"display: link_bw %d, link_nr %d version 0x%02x\n",
nv_encoder->dcb->dpconf.link_bw,
nv_encoder->dcb->dpconf.link_nr,
dpcd[1], dpcd[2] & 0x0f, dpcd[0]);
nv_encoder->dp.dpcd_version = dpcd[0];
nv_encoder->dp.link_bw = dpcd[1];
if (nv_encoder->dp.link_bw != DP_LINK_BW_1_62 &&
!nv_encoder->dcb->dpconf.link_bw)
nv_encoder->dp.link_bw = DP_LINK_BW_1_62;
nv_encoder->dp.link_nr = dpcd[2] & DP_MAX_LANE_COUNT_MASK;
if (nv_encoder->dp.link_nr > nv_encoder->dcb->dpconf.link_nr)
nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
nv_encoder->dp.enhanced_frame = (dpcd[2] & DP_ENHANCED_FRAME_CAP);
return true;
}
int
nouveau_dp_auxch(struct nouveau_i2c_chan *auxch, int cmd, int addr,
uint8_t *data, int data_nr)
{
return auxch_tx(auxch->dev, auxch->rd, cmd, addr, data, data_nr);
}
static int
nouveau_dp_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
struct nouveau_i2c_chan *auxch = (struct nouveau_i2c_chan *)adap;
struct i2c_msg *msg = msgs;
int ret, mcnt = num;
while (mcnt--) {
u8 remaining = msg->len;
u8 *ptr = msg->buf;
while (remaining) {
u8 cnt = (remaining > 16) ? 16 : remaining;
u8 cmd;
if (msg->flags & I2C_M_RD)
cmd = AUX_I2C_READ;
else
cmd = AUX_I2C_WRITE;
if (mcnt || remaining > 16)
cmd |= AUX_I2C_MOT;
ret = nouveau_dp_auxch(auxch, cmd, msg->addr, ptr, cnt);
if (ret < 0)
return ret;
ptr += cnt;
remaining -= cnt;
}
msg++;
}
return num;
}
static u32
nouveau_dp_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
const struct i2c_algorithm nouveau_dp_i2c_algo = {
.master_xfer = nouveau_dp_i2c_xfer,
.functionality = nouveau_dp_i2c_func
};