1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2019 NXP. 4 */ 5 6 #include <drm/drm_atomic_helper.h> 7 #include <drm/drm_vblank.h> 8 #include <linux/platform_device.h> 9 #include <linux/pm_runtime.h> 10 11 #include "dcss-dev.h" 12 #include "dcss-kms.h" 13 14 static int dcss_enable_vblank(struct drm_crtc *crtc) 15 { 16 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc, 17 base); 18 struct dcss_dev *dcss = crtc->dev->dev_private; 19 20 dcss_dtg_vblank_irq_enable(dcss->dtg, true); 21 22 dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true); 23 24 enable_irq(dcss_crtc->irq); 25 26 return 0; 27 } 28 29 static void dcss_disable_vblank(struct drm_crtc *crtc) 30 { 31 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc, 32 base); 33 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private; 34 35 disable_irq_nosync(dcss_crtc->irq); 36 37 dcss_dtg_vblank_irq_enable(dcss->dtg, false); 38 39 if (dcss_crtc->disable_ctxld_kick_irq) 40 dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, false); 41 } 42 43 static const struct drm_crtc_funcs dcss_crtc_funcs = { 44 .set_config = drm_atomic_helper_set_config, 45 .destroy = drm_crtc_cleanup, 46 .page_flip = drm_atomic_helper_page_flip, 47 .reset = drm_atomic_helper_crtc_reset, 48 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 49 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 50 .enable_vblank = dcss_enable_vblank, 51 .disable_vblank = dcss_disable_vblank, 52 }; 53 54 static void dcss_crtc_atomic_begin(struct drm_crtc *crtc, 55 struct drm_crtc_state *old_crtc_state) 56 { 57 drm_crtc_vblank_on(crtc); 58 } 59 60 static void dcss_crtc_atomic_flush(struct drm_crtc *crtc, 61 struct drm_crtc_state *old_crtc_state) 62 { 63 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc, 64 base); 65 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private; 66 67 spin_lock_irq(&crtc->dev->event_lock); 68 if (crtc->state->event) { 69 WARN_ON(drm_crtc_vblank_get(crtc)); 70 drm_crtc_arm_vblank_event(crtc, crtc->state->event); 71 crtc->state->event = NULL; 72 } 73 spin_unlock_irq(&crtc->dev->event_lock); 74 75 if (dcss_dtg_is_enabled(dcss->dtg)) 76 dcss_ctxld_enable(dcss->ctxld); 77 } 78 79 static void dcss_crtc_atomic_enable(struct drm_crtc *crtc, 80 struct drm_crtc_state *old_crtc_state) 81 { 82 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc, 83 base); 84 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private; 85 struct drm_display_mode *mode = &crtc->state->adjusted_mode; 86 struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode; 87 struct videomode vm; 88 89 drm_display_mode_to_videomode(mode, &vm); 90 91 pm_runtime_get_sync(dcss->dev); 92 93 vm.pixelclock = mode->crtc_clock * 1000; 94 95 dcss_ss_subsam_set(dcss->ss); 96 dcss_dtg_css_set(dcss->dtg); 97 98 if (!drm_mode_equal(mode, old_mode) || !old_crtc_state->active) { 99 dcss_dtg_sync_set(dcss->dtg, &vm); 100 dcss_ss_sync_set(dcss->ss, &vm, 101 mode->flags & DRM_MODE_FLAG_PHSYNC, 102 mode->flags & DRM_MODE_FLAG_PVSYNC); 103 } 104 105 dcss_enable_dtg_and_ss(dcss); 106 107 dcss_ctxld_enable(dcss->ctxld); 108 109 /* Allow CTXLD kick interrupt to be disabled when VBLANK is disabled. */ 110 dcss_crtc->disable_ctxld_kick_irq = true; 111 } 112 113 static void dcss_crtc_atomic_disable(struct drm_crtc *crtc, 114 struct drm_crtc_state *old_crtc_state) 115 { 116 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc, 117 base); 118 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private; 119 struct drm_display_mode *mode = &crtc->state->adjusted_mode; 120 struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode; 121 122 drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false); 123 124 spin_lock_irq(&crtc->dev->event_lock); 125 if (crtc->state->event) { 126 drm_crtc_send_vblank_event(crtc, crtc->state->event); 127 crtc->state->event = NULL; 128 } 129 spin_unlock_irq(&crtc->dev->event_lock); 130 131 dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true); 132 133 reinit_completion(&dcss->disable_completion); 134 135 dcss_disable_dtg_and_ss(dcss); 136 137 dcss_ctxld_enable(dcss->ctxld); 138 139 if (!drm_mode_equal(mode, old_mode) || !crtc->state->active) 140 if (!wait_for_completion_timeout(&dcss->disable_completion, 141 msecs_to_jiffies(100))) 142 dev_err(dcss->dev, "Shutting off DTG timed out.\n"); 143 144 /* 145 * Do not shut off CTXLD kick interrupt when shutting VBLANK off. It 146 * will be needed to commit the last changes, before going to suspend. 147 */ 148 dcss_crtc->disable_ctxld_kick_irq = false; 149 150 drm_crtc_vblank_off(crtc); 151 152 pm_runtime_mark_last_busy(dcss->dev); 153 pm_runtime_put_autosuspend(dcss->dev); 154 } 155 156 static const struct drm_crtc_helper_funcs dcss_helper_funcs = { 157 .atomic_begin = dcss_crtc_atomic_begin, 158 .atomic_flush = dcss_crtc_atomic_flush, 159 .atomic_enable = dcss_crtc_atomic_enable, 160 .atomic_disable = dcss_crtc_atomic_disable, 161 }; 162 163 static irqreturn_t dcss_crtc_irq_handler(int irq, void *dev_id) 164 { 165 struct dcss_crtc *dcss_crtc = dev_id; 166 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private; 167 168 if (!dcss_dtg_vblank_irq_valid(dcss->dtg)) 169 return IRQ_NONE; 170 171 if (dcss_ctxld_is_flushed(dcss->ctxld)) 172 drm_crtc_handle_vblank(&dcss_crtc->base); 173 174 dcss_dtg_vblank_irq_clear(dcss->dtg); 175 176 return IRQ_HANDLED; 177 } 178 179 int dcss_crtc_init(struct dcss_crtc *crtc, struct drm_device *drm) 180 { 181 struct dcss_dev *dcss = drm->dev_private; 182 struct platform_device *pdev = to_platform_device(dcss->dev); 183 int ret; 184 185 crtc->plane[0] = dcss_plane_init(drm, drm_crtc_mask(&crtc->base), 186 DRM_PLANE_TYPE_PRIMARY, 0); 187 if (IS_ERR(crtc->plane[0])) 188 return PTR_ERR(crtc->plane[0]); 189 190 crtc->base.port = dcss->of_port; 191 192 drm_crtc_helper_add(&crtc->base, &dcss_helper_funcs); 193 ret = drm_crtc_init_with_planes(drm, &crtc->base, &crtc->plane[0]->base, 194 NULL, &dcss_crtc_funcs, NULL); 195 if (ret) { 196 dev_err(dcss->dev, "failed to init crtc\n"); 197 return ret; 198 } 199 200 crtc->irq = platform_get_irq_byname(pdev, "vblank"); 201 if (crtc->irq < 0) 202 return crtc->irq; 203 204 ret = request_irq(crtc->irq, dcss_crtc_irq_handler, 205 0, "dcss_drm", crtc); 206 if (ret) { 207 dev_err(dcss->dev, "irq request failed with %d.\n", ret); 208 return ret; 209 } 210 211 disable_irq(crtc->irq); 212 213 return 0; 214 } 215 216 void dcss_crtc_deinit(struct dcss_crtc *crtc, struct drm_device *drm) 217 { 218 free_irq(crtc->irq, crtc); 219 } 220