--- /dev/null
+/*
+ * Copyright 2013 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 "dport.h"
+#include "outpdp.h"
+#include "nv50.h"
+
+#include <subdev/bios.h>
+#include <subdev/bios/init.h>
+#include <subdev/i2c.h>
+
+#include <nvif/class.h>
+
+/******************************************************************************
+ * link training
+ *****************************************************************************/
+struct dp_state {
+ struct nvkm_output_dp *outp;
+ int link_nr;
+ u32 link_bw;
+ u8 stat[6];
+ u8 conf[4];
+ bool pc2;
+ u8 pc2stat;
+ u8 pc2conf[2];
+};
+
+static int
+dp_set_link_config(struct dp_state *dp)
+{
+ struct nvkm_output_dp_impl *impl = (void *)nv_oclass(dp->outp);
+ struct nvkm_output_dp *outp = dp->outp;
+ struct nvkm_disp *disp = nvkm_disp(outp);
+ struct nvkm_bios *bios = nvkm_bios(disp);
+ struct nvbios_init init = {
+ .subdev = nv_subdev(disp),
+ .bios = bios,
+ .offset = 0x0000,
+ .outp = &outp->base.info,
+ .crtc = -1,
+ .execute = 1,
+ };
+ u32 lnkcmp;
+ u8 sink[2];
+ int ret;
+
+ DBG("%d lanes at %d KB/s\n", dp->link_nr, dp->link_bw);
+
+ /* set desired link configuration on the source */
+ if ((lnkcmp = dp->outp->info.lnkcmp)) {
+ if (outp->version < 0x30) {
+ while ((dp->link_bw / 10) < nv_ro16(bios, lnkcmp))
+ lnkcmp += 4;
+ init.offset = nv_ro16(bios, lnkcmp + 2);
+ } else {
+ while ((dp->link_bw / 27000) < nv_ro08(bios, lnkcmp))
+ lnkcmp += 3;
+ init.offset = nv_ro16(bios, lnkcmp + 1);
+ }
+
+ nvbios_exec(&init);
+ }
+
+ ret = impl->lnk_ctl(outp, dp->link_nr, dp->link_bw / 27000,
+ outp->dpcd[DPCD_RC02] &
+ DPCD_RC02_ENHANCED_FRAME_CAP);
+ if (ret) {
+ if (ret < 0)
+ ERR("lnk_ctl failed with %d\n", ret);
+ return ret;
+ }
+
+ impl->lnk_pwr(outp, dp->link_nr);
+
+ /* set desired link configuration on the sink */
+ sink[0] = dp->link_bw / 27000;
+ sink[1] = dp->link_nr;
+ if (outp->dpcd[DPCD_RC02] & DPCD_RC02_ENHANCED_FRAME_CAP)
+ sink[1] |= DPCD_LC01_ENHANCED_FRAME_EN;
+
+ return nv_wraux(outp->base.edid, DPCD_LC00_LINK_BW_SET, sink, 2);
+}
+
+static void
+dp_set_training_pattern(struct dp_state *dp, u8 pattern)
+{
+ struct nvkm_output_dp_impl *impl = (void *)nv_oclass(dp->outp);
+ struct nvkm_output_dp *outp = dp->outp;
+ u8 sink_tp;
+
+ DBG("training pattern %d\n", pattern);
+ impl->pattern(outp, pattern);
+
+ nv_rdaux(outp->base.edid, DPCD_LC02, &sink_tp, 1);
+ sink_tp &= ~DPCD_LC02_TRAINING_PATTERN_SET;
+ sink_tp |= pattern;
+ nv_wraux(outp->base.edid, DPCD_LC02, &sink_tp, 1);
+}
+
+static int
+dp_link_train_commit(struct dp_state *dp, bool pc)
+{
+ struct nvkm_output_dp_impl *impl = (void *)nv_oclass(dp->outp);
+ struct nvkm_output_dp *outp = dp->outp;
+ int ret, i;
+
+ for (i = 0; i < dp->link_nr; i++) {
+ u8 lane = (dp->stat[4 + (i >> 1)] >> ((i & 1) * 4)) & 0xf;
+ u8 lpc2 = (dp->pc2stat >> (i * 2)) & 0x3;
+ u8 lpre = (lane & 0x0c) >> 2;
+ u8 lvsw = (lane & 0x03) >> 0;
+ u8 hivs = 3 - lpre;
+ u8 hipe = 3;
+ u8 hipc = 3;
+
+ if (lpc2 >= hipc)
+ lpc2 = hipc | DPCD_LC0F_LANE0_MAX_POST_CURSOR2_REACHED;
+ if (lpre >= hipe) {
+ lpre = hipe | DPCD_LC03_MAX_SWING_REACHED; /* yes. */
+ lvsw = hivs = 3 - (lpre & 3);
+ } else
+ if (lvsw >= hivs) {
+ lvsw = hivs | DPCD_LC03_MAX_SWING_REACHED;
+ }
+
+ dp->conf[i] = (lpre << 3) | lvsw;
+ dp->pc2conf[i >> 1] |= lpc2 << ((i & 1) * 4);
+
+ DBG("config lane %d %02x %02x\n", i, dp->conf[i], lpc2);
+ impl->drv_ctl(outp, i, lvsw & 3, lpre & 3, lpc2 & 3);
+ }
+
+ ret = nv_wraux(outp->base.edid, DPCD_LC03(0), dp->conf, 4);
+ if (ret)
+ return ret;
+
+ if (pc) {
+ ret = nv_wraux(outp->base.edid, DPCD_LC0F, dp->pc2conf, 2);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int
+dp_link_train_update(struct dp_state *dp, bool pc, u32 delay)
+{
+ struct nvkm_output_dp *outp = dp->outp;
+ int ret;
+
+ if (outp->dpcd[DPCD_RC0E_AUX_RD_INTERVAL])
+ mdelay(outp->dpcd[DPCD_RC0E_AUX_RD_INTERVAL] * 4);
+ else
+ udelay(delay);
+
+ ret = nv_rdaux(outp->base.edid, DPCD_LS02, dp->stat, 6);
+ if (ret)
+ return ret;
+
+ if (pc) {
+ ret = nv_rdaux(outp->base.edid, DPCD_LS0C, &dp->pc2stat, 1);
+ if (ret)
+ dp->pc2stat = 0x00;
+ DBG("status %6ph pc2 %02x\n", dp->stat, dp->pc2stat);
+ } else {
+ DBG("status %6ph\n", dp->stat);
+ }
+
+ return 0;
+}
+
+static int
+dp_link_train_cr(struct dp_state *dp)
+{
+ bool cr_done = false, abort = false;
+ int voltage = dp->conf[0] & DPCD_LC03_VOLTAGE_SWING_SET;
+ int tries = 0, i;
+
+ dp_set_training_pattern(dp, 1);
+
+ do {
+ if (dp_link_train_commit(dp, false) ||
+ dp_link_train_update(dp, false, 100))
+ break;
+
+ cr_done = true;
+ for (i = 0; i < dp->link_nr; i++) {
+ u8 lane = (dp->stat[i >> 1] >> ((i & 1) * 4)) & 0xf;
+ if (!(lane & DPCD_LS02_LANE0_CR_DONE)) {
+ cr_done = false;
+ if (dp->conf[i] & DPCD_LC03_MAX_SWING_REACHED)
+ abort = true;
+ break;
+ }
+ }
+
+ if ((dp->conf[0] & DPCD_LC03_VOLTAGE_SWING_SET) != voltage) {
+ voltage = dp->conf[0] & DPCD_LC03_VOLTAGE_SWING_SET;
+ tries = 0;
+ }
+ } while (!cr_done && !abort && ++tries < 5);
+
+ return cr_done ? 0 : -1;
+}
+
+static int
+dp_link_train_eq(struct dp_state *dp)
+{
+ struct nvkm_output_dp *outp = dp->outp;
+ bool eq_done = false, cr_done = true;
+ int tries = 0, i;
+
+ if (outp->dpcd[2] & DPCD_RC02_TPS3_SUPPORTED)
+ dp_set_training_pattern(dp, 3);
+ else
+ dp_set_training_pattern(dp, 2);
+
+ do {
+ if ((tries &&
+ dp_link_train_commit(dp, dp->pc2)) ||
+ dp_link_train_update(dp, dp->pc2, 400))
+ break;
+
+ eq_done = !!(dp->stat[2] & DPCD_LS04_INTERLANE_ALIGN_DONE);
+ for (i = 0; i < dp->link_nr && eq_done; i++) {
+ u8 lane = (dp->stat[i >> 1] >> ((i & 1) * 4)) & 0xf;
+ if (!(lane & DPCD_LS02_LANE0_CR_DONE))
+ cr_done = false;
+ if (!(lane & DPCD_LS02_LANE0_CHANNEL_EQ_DONE) ||
+ !(lane & DPCD_LS02_LANE0_SYMBOL_LOCKED))
+ eq_done = false;
+ }
+ } while (!eq_done && cr_done && ++tries <= 5);
+
+ return eq_done ? 0 : -1;
+}
+
+static void
+dp_link_train_init(struct dp_state *dp, bool spread)
+{
+ struct nvkm_output_dp *outp = dp->outp;
+ struct nvkm_disp *disp = nvkm_disp(outp);
+ struct nvkm_bios *bios = nvkm_bios(disp);
+ struct nvbios_init init = {
+ .subdev = nv_subdev(disp),
+ .bios = bios,
+ .outp = &outp->base.info,
+ .crtc = -1,
+ .execute = 1,
+ };
+
+ /* set desired spread */
+ if (spread)
+ init.offset = outp->info.script[2];
+ else
+ init.offset = outp->info.script[3];
+ nvbios_exec(&init);
+
+ /* pre-train script */
+ init.offset = outp->info.script[0];
+ nvbios_exec(&init);
+}
+
+static void
+dp_link_train_fini(struct dp_state *dp)
+{
+ struct nvkm_output_dp *outp = dp->outp;
+ struct nvkm_disp *disp = nvkm_disp(outp);
+ struct nvkm_bios *bios = nvkm_bios(disp);
+ struct nvbios_init init = {
+ .subdev = nv_subdev(disp),
+ .bios = bios,
+ .outp = &outp->base.info,
+ .crtc = -1,
+ .execute = 1,
+ };
+
+ /* post-train script */
+ init.offset = outp->info.script[1],
+ nvbios_exec(&init);
+}
+
+static const struct dp_rates {
+ u32 rate;
+ u8 bw;
+ u8 nr;
+} nvkm_dp_rates[] = {
+ { 2160000, 0x14, 4 },
+ { 1080000, 0x0a, 4 },
+ { 1080000, 0x14, 2 },
+ { 648000, 0x06, 4 },
+ { 540000, 0x0a, 2 },
+ { 540000, 0x14, 1 },
+ { 324000, 0x06, 2 },
+ { 270000, 0x0a, 1 },
+ { 162000, 0x06, 1 },
+ {}
+};
+
+void
+nvkm_dp_train(struct work_struct *w)
+{
+ struct nvkm_output_dp *outp = container_of(w, typeof(*outp), lt.work);
+ struct nv50_disp_priv *priv = (void *)nvkm_disp(outp);
+ const struct dp_rates *cfg = nvkm_dp_rates;
+ struct dp_state _dp = {
+ .outp = outp,
+ }, *dp = &_dp;
+ u32 datarate = 0;
+ int ret;
+
+ if (!outp->base.info.location && priv->sor.magic)
+ priv->sor.magic(&outp->base);
+
+ /* bring capabilities within encoder limits */
+ if (nv_mclass(priv) < GF110_DISP)
+ outp->dpcd[2] &= ~DPCD_RC02_TPS3_SUPPORTED;
+ if ((outp->dpcd[2] & 0x1f) > outp->base.info.dpconf.link_nr) {
+ outp->dpcd[2] &= ~DPCD_RC02_MAX_LANE_COUNT;
+ outp->dpcd[2] |= outp->base.info.dpconf.link_nr;
+ }
+ if (outp->dpcd[1] > outp->base.info.dpconf.link_bw)
+ outp->dpcd[1] = outp->base.info.dpconf.link_bw;
+ dp->pc2 = outp->dpcd[2] & DPCD_RC02_TPS3_SUPPORTED;
+
+ /* restrict link config to the lowest required rate, if requested */
+ if (datarate) {
+ datarate = (datarate / 8) * 10; /* 8B/10B coding overhead */
+ while (cfg[1].rate >= datarate)
+ cfg++;
+ }
+ cfg--;
+
+ /* disable link interrupt handling during link training */
+ nvkm_notify_put(&outp->irq);
+
+ /* enable down-spreading and execute pre-train script from vbios */
+ dp_link_train_init(dp, outp->dpcd[3] & 0x01);
+
+ while (ret = -EIO, (++cfg)->rate) {
+ /* select next configuration supported by encoder and sink */
+ while (cfg->nr > (outp->dpcd[2] & DPCD_RC02_MAX_LANE_COUNT) ||
+ cfg->bw > (outp->dpcd[DPCD_RC01_MAX_LINK_RATE]))
+ cfg++;
+ dp->link_bw = cfg->bw * 27000;
+ dp->link_nr = cfg->nr;
+
+ /* program selected link configuration */
+ ret = dp_set_link_config(dp);
+ if (ret == 0) {
+ /* attempt to train the link at this configuration */
+ memset(dp->stat, 0x00, sizeof(dp->stat));
+ if (!dp_link_train_cr(dp) &&
+ !dp_link_train_eq(dp))
+ break;
+ } else
+ if (ret) {
+ /* dp_set_link_config() handled training, or
+ * we failed to communicate with the sink.
+ */
+ break;
+ }
+ }
+
+ /* finish link training and execute post-train script from vbios */
+ dp_set_training_pattern(dp, 0);
+ if (ret < 0)
+ ERR("link training failed\n");
+
+ dp_link_train_fini(dp);
+
+ /* signal completion and enable link interrupt handling */
+ DBG("training complete\n");
+ atomic_set(&outp->lt.done, 1);
+ wake_up(&outp->lt.wait);
+ nvkm_notify_get(&outp->irq);
+}
Code Review / kvmfornfv.git / blobdiff