1 files changed, 548 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
new file mode 100644
index 000000000000..d9a7a7865f66
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -0,0 +1,548 @@
+/*
+ * Copyright © 2008 Intel Corporation
+ *             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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ */
+
+#include <drm/drmP.h>
+#include "i915_drv.h"
+#include "intel_drv.h"
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+
+static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
+                                        struct intel_crtc_config *pipe_config)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+        struct intel_digital_port *intel_dig_port = intel_mst->primary;
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+        struct drm_device *dev = encoder->base.dev;
+        int bpp;
+        int lane_count, slots;
+        struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
+        struct intel_connector *found = NULL, *intel_connector;
+        int mst_pbn;
+
+        pipe_config->dp_encoder_is_mst = true;
+        pipe_config->has_pch_encoder = false;
+        pipe_config->has_dp_encoder = true;
+        bpp = 24;
+        /*
+         * for MST we always configure max link bw - the spec doesn't
+         * seem to suggest we should do otherwise.
+         */
+        lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
+        intel_dp->link_bw = intel_dp_max_link_bw(intel_dp);
+        intel_dp->lane_count = lane_count;
+
+        pipe_config->pipe_bpp = 24;
+        pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
+
+        list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
+                if (intel_connector->new_encoder == encoder) {
+                        found = intel_connector;
+                        break;
+                }
+        }
+
+        if (!found) {
+                DRM_ERROR("can't find connector\n");
+                return false;
+        }
+
+        mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp);
+
+        pipe_config->pbn = mst_pbn;
+        slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
+
+        intel_link_compute_m_n(bpp, lane_count,
+                               adjusted_mode->crtc_clock,
+                               pipe_config->port_clock,
+                               &pipe_config->dp_m_n);
+
+        pipe_config->dp_m_n.tu = slots;
+        return true;
+
+}
+
+static void intel_mst_disable_dp(struct intel_encoder *encoder)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+        struct intel_digital_port *intel_dig_port = intel_mst->primary;
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+        int ret;
+
+        DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
+
+        drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
+
+        ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
+        if (ret) {
+                DRM_ERROR("failed to update payload %d\n", ret);
+        }
+}
+
+static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+        struct intel_digital_port *intel_dig_port = intel_mst->primary;
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+
+        DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
+
+        /* this can fail */
+        drm_dp_check_act_status(&intel_dp->mst_mgr);
+        /* and this can also fail */
+        drm_dp_update_payload_part2(&intel_dp->mst_mgr);
+
+        drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
+
+        intel_dp->active_mst_links--;
+        intel_mst->port = NULL;
+        if (intel_dp->active_mst_links == 0) {
+                intel_dig_port->base.post_disable(&intel_dig_port->base);
+                intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
+        }
+}
+
+static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+        struct intel_digital_port *intel_dig_port = intel_mst->primary;
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+        struct drm_device *dev = encoder->base.dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        enum port port = intel_dig_port->port;
+        int ret;
+        uint32_t temp;
+        struct intel_connector *found = NULL, *intel_connector;
+        int slots;
+        struct drm_crtc *crtc = encoder->base.crtc;
+        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+        list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
+                if (intel_connector->new_encoder == encoder) {
+                        found = intel_connector;
+                        break;
+                }
+        }
+
+        if (!found) {
+                DRM_ERROR("can't find connector\n");
+                return;
+        }
+
+        DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
+        intel_mst->port = found->port;
+
+        if (intel_dp->active_mst_links == 0) {
+                enum port port = intel_ddi_get_encoder_port(encoder);
+
+                I915_WRITE(PORT_CLK_SEL(port), intel_crtc->config.ddi_pll_sel);
+
+                intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
+
+                intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
+
+
+                intel_dp_start_link_train(intel_dp);
+                intel_dp_complete_link_train(intel_dp);
+                intel_dp_stop_link_train(intel_dp);
+        }
+
+        ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
+                                       intel_mst->port, intel_crtc->config.pbn, &slots);
+        if (ret == false) {
+                DRM_ERROR("failed to allocate vcpi\n");
+                return;
+        }
+
+
+        intel_dp->active_mst_links++;
+        temp = I915_READ(DP_TP_STATUS(port));
+        I915_WRITE(DP_TP_STATUS(port), temp);
+
+        ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
+}
+
+static void intel_mst_enable_dp(struct intel_encoder *encoder)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+        struct intel_digital_port *intel_dig_port = intel_mst->primary;
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+        struct drm_device *dev = intel_dig_port->base.base.dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        enum port port = intel_dig_port->port;
+        int ret;
+
+        DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
+
+        if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
+                     1))
+                DRM_ERROR("Timed out waiting for ACT sent\n");
+
+        ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
+
+        ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
+}
+
+static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
+                                      enum pipe *pipe)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+        *pipe = intel_mst->pipe;
+        if (intel_mst->port)
+                return true;
+        return false;
+}
+
+static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
+                                        struct intel_crtc_config *pipe_config)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
+        struct intel_digital_port *intel_dig_port = intel_mst->primary;
+        struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
+        struct drm_device *dev = encoder->base.dev;
+        struct drm_i915_private *dev_priv = dev->dev_private;
+        enum transcoder cpu_transcoder = crtc->config.cpu_transcoder;
+        u32 temp, flags = 0;
+
+        pipe_config->has_dp_encoder = true;
+
+        temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
+        if (temp & TRANS_DDI_PHSYNC)
+                flags |= DRM_MODE_FLAG_PHSYNC;
+        else
+                flags |= DRM_MODE_FLAG_NHSYNC;
+        if (temp & TRANS_DDI_PVSYNC)
+                flags |= DRM_MODE_FLAG_PVSYNC;
+        else
+                flags |= DRM_MODE_FLAG_NVSYNC;
+
+        switch (temp & TRANS_DDI_BPC_MASK) {
+        case TRANS_DDI_BPC_6:
+                pipe_config->pipe_bpp = 18;
+                break;
+        case TRANS_DDI_BPC_8:
+                pipe_config->pipe_bpp = 24;
+                break;
+        case TRANS_DDI_BPC_10:
+                pipe_config->pipe_bpp = 30;
+                break;
+        case TRANS_DDI_BPC_12:
+                pipe_config->pipe_bpp = 36;
+                break;
+        default:
+                break;
+        }
+        pipe_config->adjusted_mode.flags |= flags;
+        intel_dp_get_m_n(crtc, pipe_config);
+
+        intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
+}
+
+static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
+{
+        struct intel_connector *intel_connector = to_intel_connector(connector);
+        struct intel_dp *intel_dp = intel_connector->mst_port;
+        struct edid *edid;
+        int ret;
+
+        edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
+        if (!edid)
+                return 0;
+
+        ret = intel_connector_update_modes(connector, edid);
+        kfree(edid);
+
+        return ret;
+}
+
+static enum drm_connector_status
+intel_mst_port_dp_detect(struct drm_connector *connector)
+{
+        struct intel_connector *intel_connector = to_intel_connector(connector);
+        struct intel_dp *intel_dp = intel_connector->mst_port;
+
+        return drm_dp_mst_detect_port(&intel_dp->mst_mgr, intel_connector->port);
+}
+
+static enum drm_connector_status
+intel_dp_mst_detect(struct drm_connector *connector, bool force)
+{
+        enum drm_connector_status status;
+        status = intel_mst_port_dp_detect(connector);
+        return status;
+}
+
+static int
+intel_dp_mst_set_property(struct drm_connector *connector,
+                          struct drm_property *property,
+                          uint64_t val)
+{
+        return 0;
+}
+
+static void
+intel_dp_mst_connector_destroy(struct drm_connector *connector)
+{
+        struct intel_connector *intel_connector = to_intel_connector(connector);
+
+        if (!IS_ERR_OR_NULL(intel_connector->edid))
+                kfree(intel_connector->edid);
+
+        drm_connector_cleanup(connector);
+        kfree(connector);
+}
+
+static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
+        .dpms = intel_connector_dpms,
+        .detect = intel_dp_mst_detect,
+        .fill_modes = drm_helper_probe_single_connector_modes,
+        .set_property = intel_dp_mst_set_property,
+        .destroy = intel_dp_mst_connector_destroy,
+};
+
+static int intel_dp_mst_get_modes(struct drm_connector *connector)
+{
+        return intel_dp_mst_get_ddc_modes(connector);
+}
+
+static enum drm_mode_status
+intel_dp_mst_mode_valid(struct drm_connector *connector,
+                        struct drm_display_mode *mode)
+{
+        /* TODO - validate mode against available PBN for link */
+        if (mode->clock < 10000)
+                return MODE_CLOCK_LOW;
+
+        if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+                return MODE_H_ILLEGAL;
+
+        return MODE_OK;
+}
+
+static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
+{
+        struct intel_connector *intel_connector = to_intel_connector(connector);
+        struct intel_dp *intel_dp = intel_connector->mst_port;
+        return &intel_dp->mst_encoders[0]->base.base;
+}
+
+static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
+        .get_modes = intel_dp_mst_get_modes,
+        .mode_valid = intel_dp_mst_mode_valid,
+        .best_encoder = intel_mst_best_encoder,
+};
+
+static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
+{
+        struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
+
+        drm_encoder_cleanup(encoder);
+        kfree(intel_mst);
+}
+
+static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
+        .destroy = intel_dp_mst_encoder_destroy,
+};
+
+static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
+{
+        if (connector->encoder) {
+                enum pipe pipe;
+                if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
+                        return false;
+                return true;
+        }
+        return false;
+}
+
+static void intel_connector_add_to_fbdev(struct intel_connector *connector)
+{
+#ifdef CONFIG_DRM_I915_FBDEV
+        struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+        drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
+#endif
+}
+
+static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
+{
+#ifdef CONFIG_DRM_I915_FBDEV
+        struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+        drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
+#endif
+}
+
+static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, char *pathprop)
+{
+        struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+        struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+        struct drm_device *dev = intel_dig_port->base.base.dev;
+        struct intel_connector *intel_connector;
+        struct drm_connector *connector;
+        int i;
+
+        intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
+        if (!intel_connector)
+                return NULL;
+
+        connector = &intel_connector->base;
+        drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
+        drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
+
+        intel_connector->unregister = intel_connector_unregister;
+        intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
+        intel_connector->mst_port = intel_dp;
+        intel_connector->port = port;
+
+        for (i = PIPE_A; i <= PIPE_C; i++) {
+                drm_mode_connector_attach_encoder(&intel_connector->base,
+                                                  &intel_dp->mst_encoders[i]->base.base);
+        }
+        intel_dp_add_properties(intel_dp, connector);
+
+        drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
+        drm_mode_connector_set_path_property(connector, pathprop);
+        drm_reinit_primary_mode_group(dev);
+        mutex_lock(&dev->mode_config.mutex);
+        intel_connector_add_to_fbdev(intel_connector);
+        mutex_unlock(&dev->mode_config.mutex);
+        drm_connector_register(&intel_connector->base);
+        return connector;
+}
+
+static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
+                                           struct drm_connector *connector)
+{
+        struct intel_connector *intel_connector = to_intel_connector(connector);
+        struct drm_device *dev = connector->dev;
+        /* need to nuke the connector */
+        mutex_lock(&dev->mode_config.mutex);
+        intel_connector_dpms(connector, DRM_MODE_DPMS_OFF);
+        mutex_unlock(&dev->mode_config.mutex);
+
+        intel_connector->unregister(intel_connector);
+
+        mutex_lock(&dev->mode_config.mutex);
+        intel_connector_remove_from_fbdev(intel_connector);
+        drm_connector_cleanup(connector);
+        mutex_unlock(&dev->mode_config.mutex);
+
+        drm_reinit_primary_mode_group(dev);
+
+        kfree(intel_connector);
+        DRM_DEBUG_KMS("\n");
+}
+
+static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
+{
+        struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
+        struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+        struct drm_device *dev = intel_dig_port->base.base.dev;
+
+        drm_kms_helper_hotplug_event(dev);
+}
+
+static struct drm_dp_mst_topology_cbs mst_cbs = {
+        .add_connector = intel_dp_add_mst_connector,
+        .destroy_connector = intel_dp_destroy_mst_connector,
+        .hotplug = intel_dp_mst_hotplug,
+};
+
+static struct intel_dp_mst_encoder *
+intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
+{
+        struct intel_dp_mst_encoder *intel_mst;
+        struct intel_encoder *intel_encoder;
+        struct drm_device *dev = intel_dig_port->base.base.dev;
+
+        intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
+
+        if (!intel_mst)
+                return NULL;
+
+        intel_mst->pipe = pipe;
+        intel_encoder = &intel_mst->base;
+        intel_mst->primary = intel_dig_port;
+
+        drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
+                         DRM_MODE_ENCODER_DPMST);
+
+        intel_encoder->type = INTEL_OUTPUT_DP_MST;
+        intel_encoder->crtc_mask = 0x7;
+        intel_encoder->cloneable = 0;
+
+        intel_encoder->compute_config = intel_dp_mst_compute_config;
+        intel_encoder->disable = intel_mst_disable_dp;
+        intel_encoder->post_disable = intel_mst_post_disable_dp;
+        intel_encoder->pre_enable = intel_mst_pre_enable_dp;
+        intel_encoder->enable = intel_mst_enable_dp;
+        intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
+        intel_encoder->get_config = intel_dp_mst_enc_get_config;
+
+        return intel_mst;
+
+}
+
+static bool
+intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
+{
+        int i;
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+
+        for (i = PIPE_A; i <= PIPE_C; i++)
+                intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
+        return true;
+}
+
+int
+intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
+{
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+        struct drm_device *dev = intel_dig_port->base.base.dev;
+        int ret;
+
+        intel_dp->can_mst = true;
+        intel_dp->mst_mgr.cbs = &mst_cbs;
+
+        /* create encoders */
+        intel_dp_create_fake_mst_encoders(intel_dig_port);
+        ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
+        if (ret) {
+                intel_dp->can_mst = false;
+                return ret;
+        }
+        return 0;
+}
+
+void
+intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
+{
+        struct intel_dp *intel_dp = &intel_dig_port->dp;
+
+        if (!intel_dp->can_mst)
+                return;
+
+        drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
+        /* encoders will get killed by normal cleanup */
+}