1 files changed, 302 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outpdp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outpdp.c
new file mode 100644
index 000000000000..667a9070e006
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outpdp.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright 2014 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 <core/os.h>
+#include <nvif/event.h>
+
+#include <subdev/i2c.h>
+
+#include "outpdp.h"
+#include "conn.h"
+#include "dport.h"
+
+int
+nvkm_output_dp_train(struct nvkm_output *base, u32 datarate, bool wait)
+{
+        struct nvkm_output_dp *outp = (void *)base;
+        bool retrain = true;
+        u8 link[2], stat[3];
+        u32 linkrate;
+        int ret, i;
+
+        /* check that the link is trained at a high enough rate */
+        ret = nv_rdaux(outp->base.edid, DPCD_LC00_LINK_BW_SET, link, 2);
+        if (ret) {
+                DBG("failed to read link config, assuming no sink\n");
+                goto done;
+        }
+
+        linkrate = link[0] * 27000 * (link[1] & DPCD_LC01_LANE_COUNT_SET);
+        linkrate = (linkrate * 8) / 10; /* 8B/10B coding overhead */
+        datarate = (datarate + 9) / 10; /* -> decakilobits */
+        if (linkrate < datarate) {
+                DBG("link not trained at sufficient rate\n");
+                goto done;
+        }
+
+        /* check that link is still trained */
+        ret = nv_rdaux(outp->base.edid, DPCD_LS02, stat, 3);
+        if (ret) {
+                DBG("failed to read link status, assuming no sink\n");
+                goto done;
+        }
+
+        if (stat[2] & DPCD_LS04_INTERLANE_ALIGN_DONE) {
+                for (i = 0; i < (link[1] & DPCD_LC01_LANE_COUNT_SET); i++) {
+                        u8 lane = (stat[i >> 1] >> ((i & 1) * 4)) & 0x0f;
+                        if (!(lane & DPCD_LS02_LANE0_CR_DONE) ||
+                            !(lane & DPCD_LS02_LANE0_CHANNEL_EQ_DONE) ||
+                            !(lane & DPCD_LS02_LANE0_SYMBOL_LOCKED)) {
+                                DBG("lane %d not equalised\n", lane);
+                                goto done;
+                        }
+                }
+                retrain = false;
+        } else {
+                DBG("no inter-lane alignment\n");
+        }
+
+done:
+        if (retrain || !atomic_read(&outp->lt.done)) {
+                /* no sink, but still need to configure source */
+                if (outp->dpcd[DPCD_RC00_DPCD_REV] == 0x00) {
+                        outp->dpcd[DPCD_RC01_MAX_LINK_RATE] =
+                                outp->base.info.dpconf.link_bw;
+                        outp->dpcd[DPCD_RC02] =
+                                outp->base.info.dpconf.link_nr;
+                }
+                atomic_set(&outp->lt.done, 0);
+                schedule_work(&outp->lt.work);
+        } else {
+                nvkm_notify_get(&outp->irq);
+        }
+
+        if (wait) {
+                if (!wait_event_timeout(outp->lt.wait,
+                                        atomic_read(&outp->lt.done),
+                                        msecs_to_jiffies(2000)))
+                        ret = -ETIMEDOUT;
+        }
+
+        return ret;
+}
+
+static void
+nvkm_output_dp_enable(struct nvkm_output_dp *outp, bool present)
+{
+        struct nouveau_i2c_port *port = outp->base.edid;
+        if (present) {
+                if (!outp->present) {
+                        nouveau_i2c(port)->acquire_pad(port, 0);
+                        DBG("aux power -> always\n");
+                        outp->present = true;
+                }
+                nvkm_output_dp_train(&outp->base, 0, true);
+        } else {
+                if (outp->present) {
+                        nouveau_i2c(port)->release_pad(port);
+                        DBG("aux power -> demand\n");
+                        outp->present = false;
+                }
+                atomic_set(&outp->lt.done, 0);
+        }
+}
+
+static void
+nvkm_output_dp_detect(struct nvkm_output_dp *outp)
+{
+        struct nouveau_i2c_port *port = outp->base.edid;
+        int ret = nouveau_i2c(port)->acquire_pad(port, 0);
+        if (ret == 0) {
+                ret = nv_rdaux(outp->base.edid, DPCD_RC00_DPCD_REV,
+                               outp->dpcd, sizeof(outp->dpcd));
+                nvkm_output_dp_enable(outp, ret == 0);
+                nouveau_i2c(port)->release_pad(port);
+        }
+}
+
+static int
+nvkm_output_dp_hpd(struct nvkm_notify *notify)
+{
+        struct nvkm_connector *conn = container_of(notify, typeof(*conn), hpd);
+        struct nvkm_output_dp *outp;
+        struct nouveau_disp *disp = nouveau_disp(conn);
+        const struct nvkm_i2c_ntfy_rep *line = notify->data;
+        struct nvif_notify_conn_rep_v0 rep = {};
+
+        list_for_each_entry(outp, &disp->outp, base.head) {
+                if (outp->base.conn == conn &&
+                    outp->info.type == DCB_OUTPUT_DP) {
+                        DBG("HPD: %d\n", line->mask);
+                        nvkm_output_dp_detect(outp);
+
+                        if (line->mask & NVKM_I2C_UNPLUG)
+                                rep.mask |= NVIF_NOTIFY_CONN_V0_UNPLUG;
+                        if (line->mask & NVKM_I2C_PLUG)
+                                rep.mask |= NVIF_NOTIFY_CONN_V0_PLUG;
+
+                        nvkm_event_send(&disp->hpd, rep.mask, conn->index,
+                                        &rep, sizeof(rep));
+                        return NVKM_NOTIFY_KEEP;
+                }
+        }
+
+        WARN_ON(1);
+        return NVKM_NOTIFY_DROP;
+}
+
+static int
+nvkm_output_dp_irq(struct nvkm_notify *notify)
+{
+        struct nvkm_output_dp *outp = container_of(notify, typeof(*outp), irq);
+        struct nouveau_disp *disp = nouveau_disp(outp);
+        const struct nvkm_i2c_ntfy_rep *line = notify->data;
+        struct nvif_notify_conn_rep_v0 rep = {
+                .mask = NVIF_NOTIFY_CONN_V0_IRQ,
+        };
+        int index = outp->base.info.connector;
+
+        DBG("IRQ: %d\n", line->mask);
+        nvkm_output_dp_train(&outp->base, 0, true);
+
+        nvkm_event_send(&disp->hpd, rep.mask, index, &rep, sizeof(rep));
+        return NVKM_NOTIFY_DROP;
+}
+
+int
+_nvkm_output_dp_fini(struct nouveau_object *object, bool suspend)
+{
+        struct nvkm_output_dp *outp = (void *)object;
+        nvkm_notify_put(&outp->irq);
+        nvkm_output_dp_enable(outp, false);
+        return nvkm_output_fini(&outp->base, suspend);
+}
+
+int
+_nvkm_output_dp_init(struct nouveau_object *object)
+{
+        struct nvkm_output_dp *outp = (void *)object;
+        nvkm_output_dp_detect(outp);
+        return nvkm_output_init(&outp->base);
+}
+
+void
+_nvkm_output_dp_dtor(struct nouveau_object *object)
+{
+        struct nvkm_output_dp *outp = (void *)object;
+        nvkm_notify_fini(&outp->irq);
+        nvkm_output_destroy(&outp->base);
+}
+
+int
+nvkm_output_dp_create_(struct nouveau_object *parent,
+                       struct nouveau_object *engine,
+                       struct nouveau_oclass *oclass,
+                       struct dcb_output *info, int index,
+                       int length, void **pobject)
+{
+        struct nouveau_bios *bios = nouveau_bios(parent);
+        struct nouveau_i2c *i2c = nouveau_i2c(parent);
+        struct nvkm_output_dp *outp;
+        u8  hdr, cnt, len;
+        u32 data;
+        int ret;
+
+        ret = nvkm_output_create_(parent, engine, oclass, info, index,
+                                  length, pobject);
+        outp = *pobject;
+        if (ret)
+                return ret;
+
+        nvkm_notify_fini(&outp->base.conn->hpd);
+
+        /* access to the aux channel is not optional... */
+        if (!outp->base.edid) {
+                ERR("aux channel not found\n");
+                return -ENODEV;
+        }
+
+        /* nor is the bios data for this output... */
+        data = nvbios_dpout_match(bios, outp->base.info.hasht,
+                                  outp->base.info.hashm, &outp->version,
+                                  &hdr, &cnt, &len, &outp->info);
+        if (!data) {
+                ERR("no bios dp data\n");
+                return -ENODEV;
+        }
+
+        DBG("bios dp %02x %02x %02x %02x\n", outp->version, hdr, cnt, len);
+
+        /* link training */
+        INIT_WORK(&outp->lt.work, nouveau_dp_train);
+        init_waitqueue_head(&outp->lt.wait);
+        atomic_set(&outp->lt.done, 0);
+
+        /* link maintenance */
+        ret = nvkm_notify_init(NULL, &i2c->event, nvkm_output_dp_irq, true,
+                               &(struct nvkm_i2c_ntfy_req) {
+                                .mask = NVKM_I2C_IRQ,
+                                .port = outp->base.edid->index,
+                               },
+                               sizeof(struct nvkm_i2c_ntfy_req),
+                               sizeof(struct nvkm_i2c_ntfy_rep),
+                               &outp->irq);
+        if (ret) {
+                ERR("error monitoring aux irq event: %d\n", ret);
+                return ret;
+        }
+
+        /* hotplug detect, replaces gpio-based mechanism with aux events */
+        ret = nvkm_notify_init(NULL, &i2c->event, nvkm_output_dp_hpd, true,
+                               &(struct nvkm_i2c_ntfy_req) {
+                                .mask = NVKM_I2C_PLUG | NVKM_I2C_UNPLUG,
+                                .port = outp->base.edid->index,
+                               },
+                               sizeof(struct nvkm_i2c_ntfy_req),
+                               sizeof(struct nvkm_i2c_ntfy_rep),
+                               &outp->base.conn->hpd);
+        if (ret) {
+                ERR("error monitoring aux hpd events: %d\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+
+int
+_nvkm_output_dp_ctor(struct nouveau_object *parent,
+                     struct nouveau_object *engine,
+                     struct nouveau_oclass *oclass, void *info, u32 index,
+                     struct nouveau_object **pobject)
+{
+        struct nvkm_output_dp *outp;
+        int ret;
+
+        ret = nvkm_output_dp_create(parent, engine, oclass, info, index, &outp);
+        *pobject = nv_object(outp);
+        if (ret)
+                return ret;
+
+        return 0;
+}