1 // SPDX-License-Identifier: GPL-2.0-or-later 2 // Copyright (c) 2024 Hisilicon Limited. 3 4 #include <linux/io.h> 5 6 #include <drm/drm_probe_helper.h> 7 #include <drm/drm_simple_kms_helper.h> 8 #include <drm/drm_atomic_helper.h> 9 #include <drm/drm_modes.h> 10 #include <drm/drm_drv.h> 11 #include <drm/drm_edid.h> 12 13 #include "hibmc_drm_drv.h" 14 #include "dp/dp_hw.h" 15 16 #define DP_MASKED_SINK_HPD_PLUG_INT BIT(2) 17 18 static int hibmc_dp_connector_get_modes(struct drm_connector *connector) 19 { 20 const struct drm_edid *drm_edid; 21 int count; 22 23 drm_edid = drm_edid_read(connector); 24 25 drm_edid_connector_update(connector, drm_edid); 26 27 count = drm_edid_connector_add_modes(connector); 28 29 drm_edid_free(drm_edid); 30 31 return count; 32 } 33 34 static int hibmc_dp_detect(struct drm_connector *connector, 35 struct drm_modeset_acquire_ctx *ctx, bool force) 36 { 37 mdelay(200); 38 39 return drm_connector_helper_detect_from_ddc(connector, ctx, force); 40 } 41 42 static const struct drm_connector_helper_funcs hibmc_dp_conn_helper_funcs = { 43 .get_modes = hibmc_dp_connector_get_modes, 44 .detect_ctx = hibmc_dp_detect, 45 }; 46 47 static int hibmc_dp_late_register(struct drm_connector *connector) 48 { 49 struct hibmc_dp *dp = to_hibmc_dp(connector); 50 51 hibmc_dp_enable_int(dp); 52 53 return drm_dp_aux_register(&dp->aux); 54 } 55 56 static void hibmc_dp_early_unregister(struct drm_connector *connector) 57 { 58 struct hibmc_dp *dp = to_hibmc_dp(connector); 59 60 drm_dp_aux_unregister(&dp->aux); 61 62 hibmc_dp_disable_int(dp); 63 } 64 65 static const struct drm_connector_funcs hibmc_dp_conn_funcs = { 66 .reset = drm_atomic_helper_connector_reset, 67 .fill_modes = drm_helper_probe_single_connector_modes, 68 .destroy = drm_connector_cleanup, 69 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 70 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 71 .late_register = hibmc_dp_late_register, 72 .early_unregister = hibmc_dp_early_unregister, 73 .debugfs_init = hibmc_debugfs_init, 74 }; 75 76 static inline int hibmc_dp_prepare(struct hibmc_dp *dp, struct drm_display_mode *mode) 77 { 78 int ret; 79 80 hibmc_dp_display_en(dp, false); 81 82 ret = hibmc_dp_mode_set(dp, mode); 83 if (ret) 84 drm_err(dp->drm_dev, "hibmc dp mode set failed: %d\n", ret); 85 86 return ret; 87 } 88 89 static void hibmc_dp_encoder_enable(struct drm_encoder *drm_encoder, 90 struct drm_atomic_state *state) 91 { 92 struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder); 93 struct drm_display_mode *mode = &drm_encoder->crtc->state->mode; 94 95 if (hibmc_dp_prepare(dp, mode)) 96 return; 97 98 hibmc_dp_display_en(dp, true); 99 } 100 101 static void hibmc_dp_encoder_disable(struct drm_encoder *drm_encoder, 102 struct drm_atomic_state *state) 103 { 104 struct hibmc_dp *dp = container_of(drm_encoder, struct hibmc_dp, encoder); 105 106 hibmc_dp_display_en(dp, false); 107 } 108 109 static const struct drm_encoder_helper_funcs hibmc_dp_encoder_helper_funcs = { 110 .atomic_enable = hibmc_dp_encoder_enable, 111 .atomic_disable = hibmc_dp_encoder_disable, 112 }; 113 114 irqreturn_t hibmc_dp_hpd_isr(int irq, void *arg) 115 { 116 struct drm_device *dev = (struct drm_device *)arg; 117 struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); 118 int idx; 119 120 if (!drm_dev_enter(dev, &idx)) 121 return -ENODEV; 122 123 if (priv->dp.irq_status & DP_MASKED_SINK_HPD_PLUG_INT) { 124 drm_dbg_dp(&priv->dev, "HPD IN isr occur!\n"); 125 hibmc_dp_hpd_cfg(&priv->dp); 126 } else { 127 drm_dbg_dp(&priv->dev, "HPD OUT isr occur!\n"); 128 hibmc_dp_reset_link(&priv->dp); 129 } 130 131 if (dev->registered) 132 drm_connector_helper_hpd_irq_event(&priv->dp.connector); 133 134 drm_dev_exit(idx); 135 136 return IRQ_HANDLED; 137 } 138 139 int hibmc_dp_init(struct hibmc_drm_private *priv) 140 { 141 struct drm_device *dev = &priv->dev; 142 struct drm_crtc *crtc = &priv->crtc; 143 struct hibmc_dp *dp = &priv->dp; 144 struct drm_connector *connector = &dp->connector; 145 struct drm_encoder *encoder = &dp->encoder; 146 int ret; 147 148 dp->mmio = priv->mmio; 149 dp->drm_dev = dev; 150 151 ret = hibmc_dp_hw_init(&priv->dp); 152 if (ret) { 153 drm_err(dev, "hibmc dp hw init failed: %d\n", ret); 154 return ret; 155 } 156 157 hibmc_dp_display_en(&priv->dp, false); 158 159 encoder->possible_crtcs = drm_crtc_mask(crtc); 160 ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_TMDS, NULL); 161 if (ret) { 162 drm_err(dev, "init dp encoder failed: %d\n", ret); 163 return ret; 164 } 165 166 drm_encoder_helper_add(encoder, &hibmc_dp_encoder_helper_funcs); 167 168 ret = drm_connector_init_with_ddc(dev, connector, &hibmc_dp_conn_funcs, 169 DRM_MODE_CONNECTOR_DisplayPort, &dp->aux.ddc); 170 if (ret) { 171 drm_err(dev, "init dp connector failed: %d\n", ret); 172 return ret; 173 } 174 175 drm_connector_helper_add(connector, &hibmc_dp_conn_helper_funcs); 176 177 drm_connector_attach_encoder(connector, encoder); 178 179 connector->polled = DRM_CONNECTOR_POLL_HPD; 180 181 return 0; 182 } 183