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path: root/drivers/gpu/drm/nouveau/nouveau_dp.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dp.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_dp.c569
1 files changed, 569 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
new file mode 100644
index 000000000000..de61f4640e12
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -0,0 +1,569 @@
+/*
+ * 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_encoder.h"
+
+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 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_entry *dpse;
+ 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;
+ dpse = (void *)((char *)dpe + dpe_headerlen);
+
+ ret = auxch_rd(encoder, DP_ADJUST_REQUEST_LANE0_1, request, 2);
+ if (ret)
+ return false;
+
+ NV_DEBUG(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(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)
+{
+ struct drm_device *dev = encoder->dev;
+ struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+ uint8_t config[4];
+ uint8_t status[3];
+ bool cr_done, cr_max_vs, eq_done;
+ int ret = 0, i, tries, voltage;
+
+ NV_DEBUG(dev, "link training!!\n");
+train:
+ cr_done = eq_done = false;
+
+ /* set link configuration */
+ NV_DEBUG(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)
+ 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(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(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(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(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(dev, "\twe failed\n");
+ if (nv_encoder->dp.link_bw != DP_LINK_BW_1_62) {
+ NV_DEBUG(dev, "retry link training at low rate\n");
+ nv_encoder->dp.link_bw = DP_LINK_BW_1_62;
+ goto train;
+ }
+ }
+
+ 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(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] & 0xf;
+ if (nv_encoder->dp.link_nr > nv_encoder->dcb->dpconf.link_nr)
+ nv_encoder->dp.link_nr = nv_encoder->dcb->dpconf.link_nr;
+
+ return true;
+}
+
+int
+nouveau_dp_auxch(struct nouveau_i2c_chan *auxch, int cmd, int addr,
+ uint8_t *data, int data_nr)
+{
+ struct drm_device *dev = auxch->dev;
+ uint32_t tmp, ctrl, stat = 0, data32[4] = {};
+ int ret = 0, i, index = auxch->rd;
+
+ NV_DEBUG(dev, "ch %d cmd %d addr 0x%x len %d\n", index, cmd, addr, data_nr);
+
+ tmp = nv_rd32(dev, NV50_AUXCH_CTRL(auxch->rd));
+ nv_wr32(dev, NV50_AUXCH_CTRL(auxch->rd), tmp | 0x00100000);
+ tmp = nv_rd32(dev, NV50_AUXCH_CTRL(auxch->rd));
+ if (!(tmp & 0x01000000)) {
+ NV_ERROR(dev, "expected bit 24 == 1, got 0x%08x\n", tmp);
+ ret = -EIO;
+ goto out;
+ }
+
+ for (i = 0; i < 3; i++) {
+ tmp = nv_rd32(dev, NV50_AUXCH_STAT(auxch->rd));
+ if (tmp & NV50_AUXCH_STAT_STATE_READY)
+ break;
+ udelay(100);
+ }
+
+ if (i == 3) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ if (!(cmd & 1)) {
+ memcpy(data32, data, data_nr);
+ for (i = 0; i < 4; i++) {
+ NV_DEBUG(dev, "wr %d: 0x%08x\n", i, data32[i]);
+ nv_wr32(dev, NV50_AUXCH_DATA_OUT(index, i), data32[i]);
+ }
+ }
+
+ nv_wr32(dev, NV50_AUXCH_ADDR(index), addr);
+ ctrl = nv_rd32(dev, NV50_AUXCH_CTRL(index));
+ ctrl &= ~(NV50_AUXCH_CTRL_CMD | NV50_AUXCH_CTRL_LEN);
+ ctrl |= (cmd << NV50_AUXCH_CTRL_CMD_SHIFT);
+ ctrl |= ((data_nr - 1) << NV50_AUXCH_CTRL_LEN_SHIFT);
+
+ for (;;) {
+ nv_wr32(dev, NV50_AUXCH_CTRL(index), ctrl | 0x80000000);
+ nv_wr32(dev, NV50_AUXCH_CTRL(index), ctrl);
+ nv_wr32(dev, NV50_AUXCH_CTRL(index), ctrl | 0x00010000);
+ if (!nv_wait(NV50_AUXCH_CTRL(index), 0x00010000, 0x00000000)) {
+ NV_ERROR(dev, "expected bit 16 == 0, got 0x%08x\n",
+ nv_rd32(dev, NV50_AUXCH_CTRL(index)));
+ return -EBUSY;
+ }
+
+ udelay(400);
+
+ stat = nv_rd32(dev, NV50_AUXCH_STAT(index));
+ if ((stat & NV50_AUXCH_STAT_REPLY_AUX) !=
+ NV50_AUXCH_STAT_REPLY_AUX_DEFER)
+ break;
+ }
+
+ if (cmd & 1) {
+ for (i = 0; i < 4; i++) {
+ data32[i] = nv_rd32(dev, NV50_AUXCH_DATA_IN(index, i));
+ NV_DEBUG(dev, "rd %d: 0x%08x\n", i, data32[i]);
+ }
+ memcpy(data, data32, data_nr);
+ }
+
+out:
+ tmp = nv_rd32(dev, NV50_AUXCH_CTRL(auxch->rd));
+ nv_wr32(dev, NV50_AUXCH_CTRL(auxch->rd), tmp & ~0x00100000);
+ tmp = nv_rd32(dev, NV50_AUXCH_CTRL(auxch->rd));
+ if (tmp & 0x01000000) {
+ NV_ERROR(dev, "expected bit 24 == 0, got 0x%08x\n", tmp);
+ ret = -EIO;
+ }
+
+ udelay(400);
+
+ return ret ? ret : (stat & NV50_AUXCH_STAT_REPLY);
+}
+
+int
+nouveau_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
+ uint8_t write_byte, uint8_t *read_byte)
+{
+ struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
+ struct nouveau_i2c_chan *auxch = (struct nouveau_i2c_chan *)adapter;
+ struct drm_device *dev = auxch->dev;
+ int ret = 0, cmd, addr = algo_data->address;
+ uint8_t *buf;
+
+ if (mode == MODE_I2C_READ) {
+ cmd = AUX_I2C_READ;
+ buf = read_byte;
+ } else {
+ cmd = (mode & MODE_I2C_READ) ? AUX_I2C_READ : AUX_I2C_WRITE;
+ buf = &write_byte;
+ }
+
+ if (!(mode & MODE_I2C_STOP))
+ cmd |= AUX_I2C_MOT;
+
+ if (mode & MODE_I2C_START)
+ return 1;
+
+ for (;;) {
+ ret = nouveau_dp_auxch(auxch, cmd, addr, buf, 1);
+ if (ret < 0)
+ return ret;
+
+ switch (ret & NV50_AUXCH_STAT_REPLY_I2C) {
+ case NV50_AUXCH_STAT_REPLY_I2C_ACK:
+ return 1;
+ case NV50_AUXCH_STAT_REPLY_I2C_NACK:
+ return -EREMOTEIO;
+ case NV50_AUXCH_STAT_REPLY_I2C_DEFER:
+ udelay(100);
+ break;
+ default:
+ NV_ERROR(dev, "invalid auxch status: 0x%08x\n", ret);
+ return -EREMOTEIO;
+ }
+ }
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 04:03:18 +0000