From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/gpu/drm/nouveau/nvkm/engine/disp/dport.c | 398 +++++++++++++++++++++++ 1 file changed, 398 insertions(+) create mode 100644 drivers/gpu/drm/nouveau/nvkm/engine/disp/dport.c (limited to 'drivers/gpu/drm/nouveau/nvkm/engine/disp/dport.c') diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dport.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dport.c new file mode 100644 index 000000000..68347661a --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dport.c @@ -0,0 +1,398 @@ +/* + * 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 +#include +#include + +#include + +/****************************************************************************** + * 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); +} -- cgit v1.2.3-54-g00ecf