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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
0004  */
0005 
0006 #include "drm/drm_bridge_connector.h"
0007 
0008 #include "msm_kms.h"
0009 #include "dsi.h"
0010 
0011 #define DSI_CLOCK_MASTER    DSI_0
0012 #define DSI_CLOCK_SLAVE     DSI_1
0013 
0014 #define DSI_LEFT        DSI_0
0015 #define DSI_RIGHT       DSI_1
0016 
0017 /* According to the current drm framework sequence, take the encoder of
0018  * DSI_1 as master encoder
0019  */
0020 #define DSI_ENCODER_MASTER  DSI_1
0021 #define DSI_ENCODER_SLAVE   DSI_0
0022 
0023 struct msm_dsi_manager {
0024     struct msm_dsi *dsi[DSI_MAX];
0025 
0026     bool is_bonded_dsi;
0027     bool is_sync_needed;
0028     int master_dsi_link_id;
0029 };
0030 
0031 static struct msm_dsi_manager msm_dsim_glb;
0032 
0033 #define IS_BONDED_DSI()     (msm_dsim_glb.is_bonded_dsi)
0034 #define IS_SYNC_NEEDED()    (msm_dsim_glb.is_sync_needed)
0035 #define IS_MASTER_DSI_LINK(id)  (msm_dsim_glb.master_dsi_link_id == id)
0036 
0037 #ifdef CONFIG_OF
0038 static bool dsi_mgr_power_on_early(struct drm_bridge *bridge)
0039 {
0040     struct drm_bridge *next_bridge = drm_bridge_get_next_bridge(bridge);
0041 
0042     /*
0043      * If the next bridge in the chain is the Parade ps8640 bridge chip
0044      * then don't power on early since it seems to violate the expectations
0045      * of the firmware that the bridge chip is running.
0046      *
0047      * NOTE: this is expected to be a temporary special case. It's expected
0048      * that we'll eventually have a framework that allows the next level
0049      * bridge to indicate whether it needs us to power on before it or
0050      * after it. When that framework is in place then we'll use it and
0051      * remove this special case.
0052      */
0053     return !(next_bridge && next_bridge->of_node &&
0054          of_device_is_compatible(next_bridge->of_node, "parade,ps8640"));
0055 }
0056 #else
0057 static inline bool dsi_mgr_power_on_early(struct drm_bridge *bridge)
0058 {
0059     return true;
0060 }
0061 #endif
0062 
0063 static inline struct msm_dsi *dsi_mgr_get_dsi(int id)
0064 {
0065     return msm_dsim_glb.dsi[id];
0066 }
0067 
0068 static inline struct msm_dsi *dsi_mgr_get_other_dsi(int id)
0069 {
0070     return msm_dsim_glb.dsi[(id + 1) % DSI_MAX];
0071 }
0072 
0073 static int dsi_mgr_parse_of(struct device_node *np, int id)
0074 {
0075     struct msm_dsi_manager *msm_dsim = &msm_dsim_glb;
0076 
0077     /* We assume 2 dsi nodes have the same information of bonded dsi and
0078      * sync-mode, and only one node specifies master in case of bonded mode.
0079      */
0080     if (!msm_dsim->is_bonded_dsi)
0081         msm_dsim->is_bonded_dsi = of_property_read_bool(np, "qcom,dual-dsi-mode");
0082 
0083     if (msm_dsim->is_bonded_dsi) {
0084         if (of_property_read_bool(np, "qcom,master-dsi"))
0085             msm_dsim->master_dsi_link_id = id;
0086         if (!msm_dsim->is_sync_needed)
0087             msm_dsim->is_sync_needed = of_property_read_bool(
0088                     np, "qcom,sync-dual-dsi");
0089     }
0090 
0091     return 0;
0092 }
0093 
0094 static int dsi_mgr_setup_components(int id)
0095 {
0096     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0097     struct msm_dsi *other_dsi = dsi_mgr_get_other_dsi(id);
0098     struct msm_dsi *clk_master_dsi = dsi_mgr_get_dsi(DSI_CLOCK_MASTER);
0099     struct msm_dsi *clk_slave_dsi = dsi_mgr_get_dsi(DSI_CLOCK_SLAVE);
0100     int ret;
0101 
0102     if (!IS_BONDED_DSI()) {
0103         ret = msm_dsi_host_register(msm_dsi->host);
0104         if (ret)
0105             return ret;
0106 
0107         msm_dsi_phy_set_usecase(msm_dsi->phy, MSM_DSI_PHY_STANDALONE);
0108         msm_dsi_host_set_phy_mode(msm_dsi->host, msm_dsi->phy);
0109     } else if (other_dsi) {
0110         struct msm_dsi *master_link_dsi = IS_MASTER_DSI_LINK(id) ?
0111                             msm_dsi : other_dsi;
0112         struct msm_dsi *slave_link_dsi = IS_MASTER_DSI_LINK(id) ?
0113                             other_dsi : msm_dsi;
0114         /* Register slave host first, so that slave DSI device
0115          * has a chance to probe, and do not block the master
0116          * DSI device's probe.
0117          * Also, do not check defer for the slave host,
0118          * because only master DSI device adds the panel to global
0119          * panel list. The panel's device is the master DSI device.
0120          */
0121         ret = msm_dsi_host_register(slave_link_dsi->host);
0122         if (ret)
0123             return ret;
0124         ret = msm_dsi_host_register(master_link_dsi->host);
0125         if (ret)
0126             return ret;
0127 
0128         /* PLL0 is to drive both 2 DSI link clocks in bonded DSI mode. */
0129         msm_dsi_phy_set_usecase(clk_master_dsi->phy,
0130                     MSM_DSI_PHY_MASTER);
0131         msm_dsi_phy_set_usecase(clk_slave_dsi->phy,
0132                     MSM_DSI_PHY_SLAVE);
0133         msm_dsi_host_set_phy_mode(msm_dsi->host, msm_dsi->phy);
0134         msm_dsi_host_set_phy_mode(other_dsi->host, other_dsi->phy);
0135     }
0136 
0137     return 0;
0138 }
0139 
0140 static int enable_phy(struct msm_dsi *msm_dsi,
0141               struct msm_dsi_phy_shared_timings *shared_timings)
0142 {
0143     struct msm_dsi_phy_clk_request clk_req;
0144     int ret;
0145     bool is_bonded_dsi = IS_BONDED_DSI();
0146 
0147     msm_dsi_host_get_phy_clk_req(msm_dsi->host, &clk_req, is_bonded_dsi);
0148 
0149     ret = msm_dsi_phy_enable(msm_dsi->phy, &clk_req, shared_timings);
0150 
0151     return ret;
0152 }
0153 
0154 static int
0155 dsi_mgr_phy_enable(int id,
0156            struct msm_dsi_phy_shared_timings shared_timings[DSI_MAX])
0157 {
0158     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0159     struct msm_dsi *mdsi = dsi_mgr_get_dsi(DSI_CLOCK_MASTER);
0160     struct msm_dsi *sdsi = dsi_mgr_get_dsi(DSI_CLOCK_SLAVE);
0161     int ret;
0162 
0163     /* In case of bonded DSI, some registers in PHY1 have been programmed
0164      * during PLL0 clock's set_rate. The PHY1 reset called by host1 here
0165      * will silently reset those PHY1 registers. Therefore we need to reset
0166      * and enable both PHYs before any PLL clock operation.
0167      */
0168     if (IS_BONDED_DSI() && mdsi && sdsi) {
0169         if (!mdsi->phy_enabled && !sdsi->phy_enabled) {
0170             msm_dsi_host_reset_phy(mdsi->host);
0171             msm_dsi_host_reset_phy(sdsi->host);
0172 
0173             ret = enable_phy(mdsi,
0174                      &shared_timings[DSI_CLOCK_MASTER]);
0175             if (ret)
0176                 return ret;
0177             ret = enable_phy(sdsi,
0178                      &shared_timings[DSI_CLOCK_SLAVE]);
0179             if (ret) {
0180                 msm_dsi_phy_disable(mdsi->phy);
0181                 return ret;
0182             }
0183         }
0184     } else {
0185         msm_dsi_host_reset_phy(msm_dsi->host);
0186         ret = enable_phy(msm_dsi, &shared_timings[id]);
0187         if (ret)
0188             return ret;
0189     }
0190 
0191     msm_dsi->phy_enabled = true;
0192 
0193     return 0;
0194 }
0195 
0196 static void dsi_mgr_phy_disable(int id)
0197 {
0198     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0199     struct msm_dsi *mdsi = dsi_mgr_get_dsi(DSI_CLOCK_MASTER);
0200     struct msm_dsi *sdsi = dsi_mgr_get_dsi(DSI_CLOCK_SLAVE);
0201 
0202     /* disable DSI phy
0203      * In bonded dsi configuration, the phy should be disabled for the
0204      * first controller only when the second controller is disabled.
0205      */
0206     msm_dsi->phy_enabled = false;
0207     if (IS_BONDED_DSI() && mdsi && sdsi) {
0208         if (!mdsi->phy_enabled && !sdsi->phy_enabled) {
0209             msm_dsi_phy_disable(sdsi->phy);
0210             msm_dsi_phy_disable(mdsi->phy);
0211         }
0212     } else {
0213         msm_dsi_phy_disable(msm_dsi->phy);
0214     }
0215 }
0216 
0217 struct dsi_connector {
0218     struct drm_connector base;
0219     int id;
0220 };
0221 
0222 struct dsi_bridge {
0223     struct drm_bridge base;
0224     int id;
0225 };
0226 
0227 #define to_dsi_connector(x) container_of(x, struct dsi_connector, base)
0228 #define to_dsi_bridge(x) container_of(x, struct dsi_bridge, base)
0229 
0230 static inline int dsi_mgr_connector_get_id(struct drm_connector *connector)
0231 {
0232     struct dsi_connector *dsi_connector = to_dsi_connector(connector);
0233     return dsi_connector->id;
0234 }
0235 
0236 static int dsi_mgr_bridge_get_id(struct drm_bridge *bridge)
0237 {
0238     struct dsi_bridge *dsi_bridge = to_dsi_bridge(bridge);
0239     return dsi_bridge->id;
0240 }
0241 
0242 static int msm_dsi_manager_panel_init(struct drm_connector *conn, u8 id)
0243 {
0244     struct msm_drm_private *priv = conn->dev->dev_private;
0245     struct msm_kms *kms = priv->kms;
0246     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0247     struct msm_dsi *other_dsi = dsi_mgr_get_other_dsi(id);
0248     struct msm_dsi *master_dsi, *slave_dsi;
0249     struct drm_panel *panel;
0250 
0251     if (IS_BONDED_DSI() && !IS_MASTER_DSI_LINK(id)) {
0252         master_dsi = other_dsi;
0253         slave_dsi = msm_dsi;
0254     } else {
0255         master_dsi = msm_dsi;
0256         slave_dsi = other_dsi;
0257     }
0258 
0259     /*
0260      * There is only 1 panel in the global panel list for bonded DSI mode.
0261      * Therefore slave dsi should get the drm_panel instance from master
0262      * dsi.
0263      */
0264     panel = msm_dsi_host_get_panel(master_dsi->host);
0265     if (IS_ERR(panel)) {
0266         DRM_ERROR("Could not find panel for %u (%ld)\n", msm_dsi->id,
0267               PTR_ERR(panel));
0268         return PTR_ERR(panel);
0269     }
0270 
0271     if (!panel || !IS_BONDED_DSI())
0272         goto out;
0273 
0274     drm_object_attach_property(&conn->base,
0275                    conn->dev->mode_config.tile_property, 0);
0276 
0277     /*
0278      * Set split display info to kms once bonded DSI panel is connected to
0279      * both hosts.
0280      */
0281     if (other_dsi && other_dsi->panel && kms->funcs->set_split_display) {
0282         kms->funcs->set_split_display(kms, master_dsi->encoder,
0283                           slave_dsi->encoder,
0284                           msm_dsi_is_cmd_mode(msm_dsi));
0285     }
0286 
0287 out:
0288     msm_dsi->panel = panel;
0289     return 0;
0290 }
0291 
0292 static enum drm_connector_status dsi_mgr_connector_detect(
0293         struct drm_connector *connector, bool force)
0294 {
0295     int id = dsi_mgr_connector_get_id(connector);
0296     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0297 
0298     return msm_dsi->panel ? connector_status_connected :
0299         connector_status_disconnected;
0300 }
0301 
0302 static void dsi_mgr_connector_destroy(struct drm_connector *connector)
0303 {
0304     struct dsi_connector *dsi_connector = to_dsi_connector(connector);
0305 
0306     DBG("");
0307 
0308     drm_connector_cleanup(connector);
0309 
0310     kfree(dsi_connector);
0311 }
0312 
0313 static int dsi_mgr_connector_get_modes(struct drm_connector *connector)
0314 {
0315     int id = dsi_mgr_connector_get_id(connector);
0316     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0317     struct drm_panel *panel = msm_dsi->panel;
0318     int num;
0319 
0320     if (!panel)
0321         return 0;
0322 
0323     /*
0324      * In bonded DSI mode, we have one connector that can be
0325      * attached to the drm_panel.
0326      */
0327     num = drm_panel_get_modes(panel, connector);
0328     if (!num)
0329         return 0;
0330 
0331     return num;
0332 }
0333 
0334 static struct drm_encoder *
0335 dsi_mgr_connector_best_encoder(struct drm_connector *connector)
0336 {
0337     int id = dsi_mgr_connector_get_id(connector);
0338     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0339 
0340     DBG("");
0341     return msm_dsi_get_encoder(msm_dsi);
0342 }
0343 
0344 static void dsi_mgr_bridge_power_on(struct drm_bridge *bridge)
0345 {
0346     int id = dsi_mgr_bridge_get_id(bridge);
0347     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0348     struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
0349     struct mipi_dsi_host *host = msm_dsi->host;
0350     struct msm_dsi_phy_shared_timings phy_shared_timings[DSI_MAX];
0351     bool is_bonded_dsi = IS_BONDED_DSI();
0352     int ret;
0353 
0354     DBG("id=%d", id);
0355     if (!msm_dsi_device_connected(msm_dsi))
0356         return;
0357 
0358     /* Do nothing with the host if it is slave-DSI in case of bonded DSI */
0359     if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
0360         return;
0361 
0362     ret = dsi_mgr_phy_enable(id, phy_shared_timings);
0363     if (ret)
0364         goto phy_en_fail;
0365 
0366     ret = msm_dsi_host_power_on(host, &phy_shared_timings[id], is_bonded_dsi, msm_dsi->phy);
0367     if (ret) {
0368         pr_err("%s: power on host %d failed, %d\n", __func__, id, ret);
0369         goto host_on_fail;
0370     }
0371 
0372     if (is_bonded_dsi && msm_dsi1) {
0373         ret = msm_dsi_host_power_on(msm_dsi1->host,
0374                 &phy_shared_timings[DSI_1], is_bonded_dsi, msm_dsi1->phy);
0375         if (ret) {
0376             pr_err("%s: power on host1 failed, %d\n",
0377                             __func__, ret);
0378             goto host1_on_fail;
0379         }
0380     }
0381 
0382     /*
0383      * Enable before preparing the panel, disable after unpreparing, so
0384      * that the panel can communicate over the DSI link.
0385      */
0386     msm_dsi_host_enable_irq(host);
0387     if (is_bonded_dsi && msm_dsi1)
0388         msm_dsi_host_enable_irq(msm_dsi1->host);
0389 
0390     return;
0391 
0392 host1_on_fail:
0393     msm_dsi_host_power_off(host);
0394 host_on_fail:
0395     dsi_mgr_phy_disable(id);
0396 phy_en_fail:
0397     return;
0398 }
0399 
0400 static void dsi_mgr_bridge_pre_enable(struct drm_bridge *bridge)
0401 {
0402     int id = dsi_mgr_bridge_get_id(bridge);
0403     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0404     struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
0405     struct mipi_dsi_host *host = msm_dsi->host;
0406     struct drm_panel *panel = msm_dsi->panel;
0407     bool is_bonded_dsi = IS_BONDED_DSI();
0408     int ret;
0409 
0410     DBG("id=%d", id);
0411     if (!msm_dsi_device_connected(msm_dsi))
0412         return;
0413 
0414     /* Do nothing with the host if it is slave-DSI in case of bonded DSI */
0415     if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
0416         return;
0417 
0418     if (!dsi_mgr_power_on_early(bridge))
0419         dsi_mgr_bridge_power_on(bridge);
0420 
0421     /* Always call panel functions once, because even for dual panels,
0422      * there is only one drm_panel instance.
0423      */
0424     if (panel) {
0425         ret = drm_panel_prepare(panel);
0426         if (ret) {
0427             pr_err("%s: prepare panel %d failed, %d\n", __func__,
0428                                 id, ret);
0429             goto panel_prep_fail;
0430         }
0431     }
0432 
0433     ret = msm_dsi_host_enable(host);
0434     if (ret) {
0435         pr_err("%s: enable host %d failed, %d\n", __func__, id, ret);
0436         goto host_en_fail;
0437     }
0438 
0439     if (is_bonded_dsi && msm_dsi1) {
0440         ret = msm_dsi_host_enable(msm_dsi1->host);
0441         if (ret) {
0442             pr_err("%s: enable host1 failed, %d\n", __func__, ret);
0443             goto host1_en_fail;
0444         }
0445     }
0446 
0447     return;
0448 
0449 host1_en_fail:
0450     msm_dsi_host_disable(host);
0451 host_en_fail:
0452     if (panel)
0453         drm_panel_unprepare(panel);
0454 panel_prep_fail:
0455 
0456     return;
0457 }
0458 
0459 void msm_dsi_manager_tpg_enable(void)
0460 {
0461     struct msm_dsi *m_dsi = dsi_mgr_get_dsi(DSI_0);
0462     struct msm_dsi *s_dsi = dsi_mgr_get_dsi(DSI_1);
0463 
0464     /* if dual dsi, trigger tpg on master first then slave */
0465     if (m_dsi) {
0466         msm_dsi_host_test_pattern_en(m_dsi->host);
0467         if (IS_BONDED_DSI() && s_dsi)
0468             msm_dsi_host_test_pattern_en(s_dsi->host);
0469     }
0470 }
0471 
0472 static void dsi_mgr_bridge_enable(struct drm_bridge *bridge)
0473 {
0474     int id = dsi_mgr_bridge_get_id(bridge);
0475     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0476     struct drm_panel *panel = msm_dsi->panel;
0477     bool is_bonded_dsi = IS_BONDED_DSI();
0478     int ret;
0479 
0480     DBG("id=%d", id);
0481     if (!msm_dsi_device_connected(msm_dsi))
0482         return;
0483 
0484     /* Do nothing with the host if it is slave-DSI in case of bonded DSI */
0485     if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
0486         return;
0487 
0488     if (panel) {
0489         ret = drm_panel_enable(panel);
0490         if (ret) {
0491             pr_err("%s: enable panel %d failed, %d\n", __func__, id,
0492                                     ret);
0493         }
0494     }
0495 }
0496 
0497 static void dsi_mgr_bridge_disable(struct drm_bridge *bridge)
0498 {
0499     int id = dsi_mgr_bridge_get_id(bridge);
0500     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0501     struct drm_panel *panel = msm_dsi->panel;
0502     bool is_bonded_dsi = IS_BONDED_DSI();
0503     int ret;
0504 
0505     DBG("id=%d", id);
0506     if (!msm_dsi_device_connected(msm_dsi))
0507         return;
0508 
0509     /* Do nothing with the host if it is slave-DSI in case of bonded DSI */
0510     if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
0511         return;
0512 
0513     if (panel) {
0514         ret = drm_panel_disable(panel);
0515         if (ret)
0516             pr_err("%s: Panel %d OFF failed, %d\n", __func__, id,
0517                                     ret);
0518     }
0519 }
0520 
0521 static void dsi_mgr_bridge_post_disable(struct drm_bridge *bridge)
0522 {
0523     int id = dsi_mgr_bridge_get_id(bridge);
0524     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0525     struct msm_dsi *msm_dsi1 = dsi_mgr_get_dsi(DSI_1);
0526     struct mipi_dsi_host *host = msm_dsi->host;
0527     struct drm_panel *panel = msm_dsi->panel;
0528     bool is_bonded_dsi = IS_BONDED_DSI();
0529     int ret;
0530 
0531     DBG("id=%d", id);
0532 
0533     if (!msm_dsi_device_connected(msm_dsi))
0534         return;
0535 
0536     /*
0537      * Do nothing with the host if it is slave-DSI in case of bonded DSI.
0538      * It is safe to call dsi_mgr_phy_disable() here because a single PHY
0539      * won't be diabled until both PHYs request disable.
0540      */
0541     if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
0542         goto disable_phy;
0543 
0544     ret = msm_dsi_host_disable(host);
0545     if (ret)
0546         pr_err("%s: host %d disable failed, %d\n", __func__, id, ret);
0547 
0548     if (is_bonded_dsi && msm_dsi1) {
0549         ret = msm_dsi_host_disable(msm_dsi1->host);
0550         if (ret)
0551             pr_err("%s: host1 disable failed, %d\n", __func__, ret);
0552     }
0553 
0554     if (panel) {
0555         ret = drm_panel_unprepare(panel);
0556         if (ret)
0557             pr_err("%s: Panel %d unprepare failed,%d\n", __func__,
0558                                 id, ret);
0559     }
0560 
0561     msm_dsi_host_disable_irq(host);
0562     if (is_bonded_dsi && msm_dsi1)
0563         msm_dsi_host_disable_irq(msm_dsi1->host);
0564 
0565     /* Save PHY status if it is a clock source */
0566     msm_dsi_phy_pll_save_state(msm_dsi->phy);
0567 
0568     ret = msm_dsi_host_power_off(host);
0569     if (ret)
0570         pr_err("%s: host %d power off failed,%d\n", __func__, id, ret);
0571 
0572     if (is_bonded_dsi && msm_dsi1) {
0573         ret = msm_dsi_host_power_off(msm_dsi1->host);
0574         if (ret)
0575             pr_err("%s: host1 power off failed, %d\n",
0576                                 __func__, ret);
0577     }
0578 
0579 disable_phy:
0580     dsi_mgr_phy_disable(id);
0581 }
0582 
0583 static void dsi_mgr_bridge_mode_set(struct drm_bridge *bridge,
0584         const struct drm_display_mode *mode,
0585         const struct drm_display_mode *adjusted_mode)
0586 {
0587     int id = dsi_mgr_bridge_get_id(bridge);
0588     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0589     struct msm_dsi *other_dsi = dsi_mgr_get_other_dsi(id);
0590     struct mipi_dsi_host *host = msm_dsi->host;
0591     bool is_bonded_dsi = IS_BONDED_DSI();
0592 
0593     DBG("set mode: " DRM_MODE_FMT, DRM_MODE_ARG(mode));
0594 
0595     if (is_bonded_dsi && !IS_MASTER_DSI_LINK(id))
0596         return;
0597 
0598     msm_dsi_host_set_display_mode(host, adjusted_mode);
0599     if (is_bonded_dsi && other_dsi)
0600         msm_dsi_host_set_display_mode(other_dsi->host, adjusted_mode);
0601 
0602     if (dsi_mgr_power_on_early(bridge))
0603         dsi_mgr_bridge_power_on(bridge);
0604 }
0605 
0606 static enum drm_mode_status dsi_mgr_bridge_mode_valid(struct drm_bridge *bridge,
0607                               const struct drm_display_info *info,
0608                               const struct drm_display_mode *mode)
0609 {
0610     int id = dsi_mgr_bridge_get_id(bridge);
0611     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0612     struct mipi_dsi_host *host = msm_dsi->host;
0613 
0614     return msm_dsi_host_check_dsc(host, mode);
0615 }
0616 
0617 static const struct drm_connector_funcs dsi_mgr_connector_funcs = {
0618     .detect = dsi_mgr_connector_detect,
0619     .fill_modes = drm_helper_probe_single_connector_modes,
0620     .destroy = dsi_mgr_connector_destroy,
0621     .reset = drm_atomic_helper_connector_reset,
0622     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
0623     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0624 };
0625 
0626 static const struct drm_connector_helper_funcs dsi_mgr_conn_helper_funcs = {
0627     .get_modes = dsi_mgr_connector_get_modes,
0628     .best_encoder = dsi_mgr_connector_best_encoder,
0629 };
0630 
0631 static const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
0632     .pre_enable = dsi_mgr_bridge_pre_enable,
0633     .enable = dsi_mgr_bridge_enable,
0634     .disable = dsi_mgr_bridge_disable,
0635     .post_disable = dsi_mgr_bridge_post_disable,
0636     .mode_set = dsi_mgr_bridge_mode_set,
0637     .mode_valid = dsi_mgr_bridge_mode_valid,
0638 };
0639 
0640 /* initialize connector when we're connected to a drm_panel */
0641 struct drm_connector *msm_dsi_manager_connector_init(u8 id)
0642 {
0643     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0644     struct drm_connector *connector = NULL;
0645     struct dsi_connector *dsi_connector;
0646     int ret;
0647 
0648     dsi_connector = kzalloc(sizeof(*dsi_connector), GFP_KERNEL);
0649     if (!dsi_connector)
0650         return ERR_PTR(-ENOMEM);
0651 
0652     dsi_connector->id = id;
0653 
0654     connector = &dsi_connector->base;
0655 
0656     ret = drm_connector_init(msm_dsi->dev, connector,
0657             &dsi_mgr_connector_funcs, DRM_MODE_CONNECTOR_DSI);
0658     if (ret)
0659         return ERR_PTR(ret);
0660 
0661     drm_connector_helper_add(connector, &dsi_mgr_conn_helper_funcs);
0662 
0663     /* Enable HPD to let hpd event is handled
0664      * when panel is attached to the host.
0665      */
0666     connector->polled = DRM_CONNECTOR_POLL_HPD;
0667 
0668     /* Display driver doesn't support interlace now. */
0669     connector->interlace_allowed = 0;
0670     connector->doublescan_allowed = 0;
0671 
0672     drm_connector_attach_encoder(connector, msm_dsi->encoder);
0673 
0674     ret = msm_dsi_manager_panel_init(connector, id);
0675     if (ret) {
0676         DRM_DEV_ERROR(msm_dsi->dev->dev, "init panel failed %d\n", ret);
0677         goto fail;
0678     }
0679 
0680     return connector;
0681 
0682 fail:
0683     connector->funcs->destroy(connector);
0684     return ERR_PTR(ret);
0685 }
0686 
0687 /* initialize bridge */
0688 struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
0689 {
0690     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0691     struct drm_bridge *bridge = NULL;
0692     struct dsi_bridge *dsi_bridge;
0693     struct drm_encoder *encoder;
0694     int ret;
0695 
0696     dsi_bridge = devm_kzalloc(msm_dsi->dev->dev,
0697                 sizeof(*dsi_bridge), GFP_KERNEL);
0698     if (!dsi_bridge) {
0699         ret = -ENOMEM;
0700         goto fail;
0701     }
0702 
0703     dsi_bridge->id = id;
0704 
0705     encoder = msm_dsi->encoder;
0706 
0707     bridge = &dsi_bridge->base;
0708     bridge->funcs = &dsi_mgr_bridge_funcs;
0709 
0710     drm_bridge_add(bridge);
0711 
0712     ret = drm_bridge_attach(encoder, bridge, NULL, 0);
0713     if (ret)
0714         goto fail;
0715 
0716     return bridge;
0717 
0718 fail:
0719     if (bridge)
0720         msm_dsi_manager_bridge_destroy(bridge);
0721 
0722     return ERR_PTR(ret);
0723 }
0724 
0725 struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
0726 {
0727     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0728     struct drm_device *dev = msm_dsi->dev;
0729     struct drm_connector *connector;
0730     struct drm_encoder *encoder;
0731     struct drm_bridge *int_bridge, *ext_bridge;
0732     int ret;
0733 
0734     int_bridge = msm_dsi->bridge;
0735     ext_bridge = msm_dsi->external_bridge =
0736             msm_dsi_host_get_bridge(msm_dsi->host);
0737 
0738     encoder = msm_dsi->encoder;
0739 
0740     /*
0741      * Try first to create the bridge without it creating its own
0742      * connector.. currently some bridges support this, and others
0743      * do not (and some support both modes)
0744      */
0745     ret = drm_bridge_attach(encoder, ext_bridge, int_bridge,
0746             DRM_BRIDGE_ATTACH_NO_CONNECTOR);
0747     if (ret == -EINVAL) {
0748         struct drm_connector *connector;
0749         struct list_head *connector_list;
0750 
0751         /* link the internal dsi bridge to the external bridge */
0752         drm_bridge_attach(encoder, ext_bridge, int_bridge, 0);
0753 
0754         /*
0755          * we need the drm_connector created by the external bridge
0756          * driver (or someone else) to feed it to our driver's
0757          * priv->connector[] list, mainly for msm_fbdev_init()
0758          */
0759         connector_list = &dev->mode_config.connector_list;
0760 
0761         list_for_each_entry(connector, connector_list, head) {
0762             if (drm_connector_has_possible_encoder(connector, encoder))
0763                 return connector;
0764         }
0765 
0766         return ERR_PTR(-ENODEV);
0767     }
0768 
0769     connector = drm_bridge_connector_init(dev, encoder);
0770     if (IS_ERR(connector)) {
0771         DRM_ERROR("Unable to create bridge connector\n");
0772         return ERR_CAST(connector);
0773     }
0774 
0775     drm_connector_attach_encoder(connector, encoder);
0776 
0777     return connector;
0778 }
0779 
0780 void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)
0781 {
0782     drm_bridge_remove(bridge);
0783 }
0784 
0785 int msm_dsi_manager_cmd_xfer(int id, const struct mipi_dsi_msg *msg)
0786 {
0787     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0788     struct msm_dsi *msm_dsi0 = dsi_mgr_get_dsi(DSI_0);
0789     struct mipi_dsi_host *host = msm_dsi->host;
0790     bool is_read = (msg->rx_buf && msg->rx_len);
0791     bool need_sync = (IS_SYNC_NEEDED() && !is_read);
0792     int ret;
0793 
0794     if (!msg->tx_buf || !msg->tx_len)
0795         return 0;
0796 
0797     /* In bonded master case, panel requires the same commands sent to
0798      * both DSI links. Host issues the command trigger to both links
0799      * when DSI_1 calls the cmd transfer function, no matter it happens
0800      * before or after DSI_0 cmd transfer.
0801      */
0802     if (need_sync && (id == DSI_0))
0803         return is_read ? msg->rx_len : msg->tx_len;
0804 
0805     if (need_sync && msm_dsi0) {
0806         ret = msm_dsi_host_xfer_prepare(msm_dsi0->host, msg);
0807         if (ret) {
0808             pr_err("%s: failed to prepare non-trigger host, %d\n",
0809                 __func__, ret);
0810             return ret;
0811         }
0812     }
0813     ret = msm_dsi_host_xfer_prepare(host, msg);
0814     if (ret) {
0815         pr_err("%s: failed to prepare host, %d\n", __func__, ret);
0816         goto restore_host0;
0817     }
0818 
0819     ret = is_read ? msm_dsi_host_cmd_rx(host, msg) :
0820             msm_dsi_host_cmd_tx(host, msg);
0821 
0822     msm_dsi_host_xfer_restore(host, msg);
0823 
0824 restore_host0:
0825     if (need_sync && msm_dsi0)
0826         msm_dsi_host_xfer_restore(msm_dsi0->host, msg);
0827 
0828     return ret;
0829 }
0830 
0831 bool msm_dsi_manager_cmd_xfer_trigger(int id, u32 dma_base, u32 len)
0832 {
0833     struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
0834     struct msm_dsi *msm_dsi0 = dsi_mgr_get_dsi(DSI_0);
0835     struct mipi_dsi_host *host = msm_dsi->host;
0836 
0837     if (IS_SYNC_NEEDED() && (id == DSI_0))
0838         return false;
0839 
0840     if (IS_SYNC_NEEDED() && msm_dsi0)
0841         msm_dsi_host_cmd_xfer_commit(msm_dsi0->host, dma_base, len);
0842 
0843     msm_dsi_host_cmd_xfer_commit(host, dma_base, len);
0844 
0845     return true;
0846 }
0847 
0848 int msm_dsi_manager_register(struct msm_dsi *msm_dsi)
0849 {
0850     struct msm_dsi_manager *msm_dsim = &msm_dsim_glb;
0851     int id = msm_dsi->id;
0852     int ret;
0853 
0854     if (id >= DSI_MAX) {
0855         pr_err("%s: invalid id %d\n", __func__, id);
0856         return -EINVAL;
0857     }
0858 
0859     if (msm_dsim->dsi[id]) {
0860         pr_err("%s: dsi%d already registered\n", __func__, id);
0861         return -EBUSY;
0862     }
0863 
0864     msm_dsim->dsi[id] = msm_dsi;
0865 
0866     ret = dsi_mgr_parse_of(msm_dsi->pdev->dev.of_node, id);
0867     if (ret) {
0868         pr_err("%s: failed to parse OF DSI info\n", __func__);
0869         goto fail;
0870     }
0871 
0872     ret = dsi_mgr_setup_components(id);
0873     if (ret) {
0874         pr_err("%s: failed to register mipi dsi host for DSI %d: %d\n",
0875             __func__, id, ret);
0876         goto fail;
0877     }
0878 
0879     return 0;
0880 
0881 fail:
0882     msm_dsim->dsi[id] = NULL;
0883     return ret;
0884 }
0885 
0886 void msm_dsi_manager_unregister(struct msm_dsi *msm_dsi)
0887 {
0888     struct msm_dsi_manager *msm_dsim = &msm_dsim_glb;
0889 
0890     if (msm_dsi->host)
0891         msm_dsi_host_unregister(msm_dsi->host);
0892 
0893     if (msm_dsi->id >= 0)
0894         msm_dsim->dsi[msm_dsi->id] = NULL;
0895 }
0896 
0897 bool msm_dsi_is_bonded_dsi(struct msm_dsi *msm_dsi)
0898 {
0899     return IS_BONDED_DSI();
0900 }
0901 
0902 bool msm_dsi_is_master_dsi(struct msm_dsi *msm_dsi)
0903 {
0904     return IS_MASTER_DSI_LINK(msm_dsi->id);
0905 }
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