diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_dp.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_dp.c | 297 |
1 files changed, 1 insertions, 296 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c index 59838651ee8f..36fd22500569 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dp.c +++ b/drivers/gpu/drm/nouveau/nouveau_dp.c @@ -35,300 +35,6 @@ #include <subdev/gpio.h> #include <subdev/i2c.h> -/****************************************************************************** - * link training - *****************************************************************************/ -struct dp_state { - struct nouveau_i2c_port *auxch; - struct nouveau_object *core; - struct dcb_output *dcb; - int crtc; - u8 *dpcd; - int link_nr; - u32 link_bw; - u8 stat[6]; - u8 conf[4]; -}; - -static void -dp_set_link_config(struct drm_device *dev, struct dp_state *dp) -{ - struct nouveau_drm *drm = nouveau_drm(dev); - struct dcb_output *dcb = dp->dcb; - const u32 or = ffs(dcb->or) - 1, link = !(dcb->sorconf.link & 1); - const u32 moff = (dp->crtc << 3) | (link << 2) | or; - u8 sink[2]; - u32 data; - - NV_DEBUG(drm, "%d lanes at %d KB/s\n", dp->link_nr, dp->link_bw); - - /* set desired link configuration on the source */ - data = ((dp->link_bw / 27000) << 8) | dp->link_nr; - if (dp->dpcd[2] & DP_ENHANCED_FRAME_CAP) - data |= NV94_DISP_SOR_DP_LNKCTL_FRAME_ENH; - - nv_call(dp->core, NV94_DISP_SOR_DP_LNKCTL + moff, data); - - /* inform the sink of the new configuration */ - sink[0] = dp->link_bw / 27000; - sink[1] = dp->link_nr; - if (dp->dpcd[2] & DP_ENHANCED_FRAME_CAP) - sink[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; - - nv_wraux(dp->auxch, DP_LINK_BW_SET, sink, 2); -} - -static void -dp_set_training_pattern(struct drm_device *dev, struct dp_state *dp, u8 pattern) -{ - struct nouveau_drm *drm = nouveau_drm(dev); - struct dcb_output *dcb = dp->dcb; - const u32 or = ffs(dcb->or) - 1, link = !(dcb->sorconf.link & 1); - const u32 moff = (dp->crtc << 3) | (link << 2) | or; - u8 sink_tp; - - NV_DEBUG(drm, "training pattern %d\n", pattern); - - nv_call(dp->core, NV94_DISP_SOR_DP_TRAIN + moff, pattern); - - nv_rdaux(dp->auxch, DP_TRAINING_PATTERN_SET, &sink_tp, 1); - sink_tp &= ~DP_TRAINING_PATTERN_MASK; - sink_tp |= pattern; - nv_wraux(dp->auxch, DP_TRAINING_PATTERN_SET, &sink_tp, 1); -} - -static int -dp_link_train_commit(struct drm_device *dev, struct dp_state *dp) -{ - struct nouveau_drm *drm = nouveau_drm(dev); - struct dcb_output *dcb = dp->dcb; - const u32 or = ffs(dcb->or) - 1, link = !(dcb->sorconf.link & 1); - const u32 moff = (dp->crtc << 3) | (link << 2) | or; - int i; - - for (i = 0; i < dp->link_nr; i++) { - u8 lane = (dp->stat[4 + (i >> 1)] >> ((i & 1) * 4)) & 0xf; - u8 lpre = (lane & 0x0c) >> 2; - u8 lvsw = (lane & 0x03) >> 0; - - dp->conf[i] = (lpre << 3) | lvsw; - if (lvsw == DP_TRAIN_VOLTAGE_SWING_1200) - dp->conf[i] |= DP_TRAIN_MAX_SWING_REACHED; - if ((lpre << 3) == DP_TRAIN_PRE_EMPHASIS_9_5) - dp->conf[i] |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; - - NV_DEBUG(drm, "config lane %d %02x\n", i, dp->conf[i]); - - nv_call(dp->core, NV94_DISP_SOR_DP_DRVCTL(i) + moff, (lvsw << 8) | lpre); - } - - return nv_wraux(dp->auxch, DP_TRAINING_LANE0_SET, dp->conf, 4); -} - -static int -dp_link_train_update(struct drm_device *dev, struct dp_state *dp, u32 delay) -{ - struct nouveau_drm *drm = nouveau_drm(dev); - int ret; - - udelay(delay); - - ret = nv_rdaux(dp->auxch, DP_LANE0_1_STATUS, dp->stat, 6); - if (ret) - return ret; - - NV_DEBUG(drm, "status %*ph\n", 6, dp->stat); - return 0; -} - -static int -dp_link_train_cr(struct drm_device *dev, struct dp_state *dp) -{ - bool cr_done = false, abort = false; - int voltage = dp->conf[0] & DP_TRAIN_VOLTAGE_SWING_MASK; - int tries = 0, i; - - dp_set_training_pattern(dev, dp, DP_TRAINING_PATTERN_1); - - do { - if (dp_link_train_commit(dev, dp) || - dp_link_train_update(dev, dp, 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 & DP_LANE_CR_DONE)) { - cr_done = false; - if (dp->conf[i] & DP_TRAIN_MAX_SWING_REACHED) - abort = true; - break; - } - } - - if ((dp->conf[0] & DP_TRAIN_VOLTAGE_SWING_MASK) != voltage) { - voltage = dp->conf[0] & DP_TRAIN_VOLTAGE_SWING_MASK; - tries = 0; - } - } while (!cr_done && !abort && ++tries < 5); - - return cr_done ? 0 : -1; -} - -static int -dp_link_train_eq(struct drm_device *dev, struct dp_state *dp) -{ - bool eq_done, cr_done = true; - int tries = 0, i; - - dp_set_training_pattern(dev, dp, DP_TRAINING_PATTERN_2); - - do { - if (dp_link_train_update(dev, dp, 400)) - break; - - eq_done = !!(dp->stat[2] & DP_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 & DP_LANE_CR_DONE)) - cr_done = false; - if (!(lane & DP_LANE_CHANNEL_EQ_DONE) || - !(lane & DP_LANE_SYMBOL_LOCKED)) - eq_done = false; - } - - if (dp_link_train_commit(dev, dp)) - break; - } while (!eq_done && cr_done && ++tries <= 5); - - return eq_done ? 0 : -1; -} - -static void -dp_link_train_init(struct drm_device *dev, struct dp_state *dp, bool spread) -{ - struct dcb_output *dcb = dp->dcb; - const u32 or = ffs(dcb->or) - 1, link = !(dcb->sorconf.link & 1); - const u32 moff = (dp->crtc << 3) | (link << 2) | or; - - nv_call(dp->core, NV94_DISP_SOR_DP_TRAIN + moff, (spread ? - NV94_DISP_SOR_DP_TRAIN_INIT_SPREAD_ON : - NV94_DISP_SOR_DP_TRAIN_INIT_SPREAD_OFF) | - NV94_DISP_SOR_DP_TRAIN_OP_INIT); -} - -static void -dp_link_train_fini(struct drm_device *dev, struct dp_state *dp) -{ - struct dcb_output *dcb = dp->dcb; - const u32 or = ffs(dcb->or) - 1, link = !(dcb->sorconf.link & 1); - const u32 moff = (dp->crtc << 3) | (link << 2) | or; - - nv_call(dp->core, NV94_DISP_SOR_DP_TRAIN + moff, - NV94_DISP_SOR_DP_TRAIN_OP_FINI); -} - -static bool -nouveau_dp_link_train(struct drm_encoder *encoder, u32 datarate, - struct nouveau_object *core) -{ - struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); - struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc); - struct nouveau_connector *nv_connector = - nouveau_encoder_connector_get(nv_encoder); - struct drm_device *dev = encoder->dev; - struct nouveau_drm *drm = nouveau_drm(dev); - struct nouveau_i2c *i2c = nouveau_i2c(drm->device); - struct nouveau_gpio *gpio = nouveau_gpio(drm->device); - const u32 bw_list[] = { 270000, 162000, 0 }; - const u32 *link_bw = bw_list; - struct dp_state dp; - - dp.auxch = i2c->find(i2c, nv_encoder->dcb->i2c_index); - if (!dp.auxch) - return false; - - dp.core = core; - dp.dcb = nv_encoder->dcb; - dp.crtc = nv_crtc->index; - dp.dpcd = nv_encoder->dp.dpcd; - - /* adjust required bandwidth for 8B/10B coding overhead */ - datarate = (datarate / 8) * 10; - - /* some sinks toggle hotplug in response to some of the actions - * we take during link training (DP_SET_POWER is one), we need - * to ignore them for the moment to avoid races. - */ - gpio->irq(gpio, 0, nv_connector->hpd, 0xff, false); - - /* enable down-spreading and execute pre-train script from vbios */ - dp_link_train_init(dev, &dp, nv_encoder->dp.dpcd[3] & 1); - - /* start off at highest link rate supported by encoder and display */ - while (*link_bw > nv_encoder->dp.link_bw) - link_bw++; - - while (link_bw[0]) { - /* find minimum required lane count at this link rate */ - dp.link_nr = nv_encoder->dp.link_nr; - while ((dp.link_nr >> 1) * link_bw[0] > datarate) - dp.link_nr >>= 1; - - /* drop link rate to minimum with this lane count */ - while ((link_bw[1] * dp.link_nr) > datarate) - link_bw++; - dp.link_bw = link_bw[0]; - - /* program selected link configuration */ - dp_set_link_config(dev, &dp); - - /* attempt to train the link at this configuration */ - memset(dp.stat, 0x00, sizeof(dp.stat)); - if (!dp_link_train_cr(dev, &dp) && - !dp_link_train_eq(dev, &dp)) - break; - - /* retry at lower rate */ - link_bw++; - } - - /* finish link training */ - dp_set_training_pattern(dev, &dp, DP_TRAINING_PATTERN_DISABLE); - - /* execute post-train script from vbios */ - dp_link_train_fini(dev, &dp); - - /* re-enable hotplug detect */ - gpio->irq(gpio, 0, nv_connector->hpd, 0xff, true); - return true; -} - -void -nouveau_dp_dpms(struct drm_encoder *encoder, int mode, u32 datarate, - struct nouveau_object *core) -{ - struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); - struct nouveau_drm *drm = nouveau_drm(encoder->dev); - struct nouveau_i2c *i2c = nouveau_i2c(drm->device); - struct nouveau_i2c_port *auxch; - u8 status; - - auxch = i2c->find(i2c, nv_encoder->dcb->i2c_index); - if (!auxch) - return; - - if (mode == DRM_MODE_DPMS_ON) - status = DP_SET_POWER_D0; - else - status = DP_SET_POWER_D3; - - nv_wraux(auxch, DP_SET_POWER, &status, 1); - - if (mode == DRM_MODE_DPMS_ON) - nouveau_dp_link_train(encoder, datarate, core); -} - static void nouveau_dp_probe_oui(struct drm_device *dev, struct nouveau_i2c_port *auxch, u8 *dpcd) @@ -355,12 +61,11 @@ nouveau_dp_detect(struct drm_encoder *encoder) struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder); struct drm_device *dev = encoder->dev; struct nouveau_drm *drm = nouveau_drm(dev); - struct nouveau_i2c *i2c = nouveau_i2c(drm->device); struct nouveau_i2c_port *auxch; u8 *dpcd = nv_encoder->dp.dpcd; int ret; - auxch = i2c->find(i2c, nv_encoder->dcb->i2c_index); + auxch = nv_encoder->i2c; if (!auxch) return false; |
