1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/ 4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 5 */ 6 7 #include <linux/platform_device.h> 8 9 #include <drm/drm_drv.h> 10 #include <drm/drm_print.h> 11 12 #include "tidss_crtc.h" 13 #include "tidss_dispc.h" 14 #include "tidss_drv.h" 15 #include "tidss_irq.h" 16 #include "tidss_plane.h" 17 18 /* call with wait_lock and dispc runtime held */ 19 static void tidss_irq_update(struct tidss_device *tidss) 20 { 21 assert_spin_locked(&tidss->wait_lock); 22 23 dispc_set_irqenable(tidss->dispc, tidss->irq_mask); 24 } 25 26 void tidss_irq_enable_vblank(struct drm_crtc *crtc) 27 { 28 struct drm_device *ddev = crtc->dev; 29 struct tidss_device *tidss = to_tidss(ddev); 30 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc); 31 u32 hw_videoport = tcrtc->hw_videoport; 32 unsigned long flags; 33 34 spin_lock_irqsave(&tidss->wait_lock, flags); 35 tidss->irq_mask |= DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) | 36 DSS_IRQ_VP_VSYNC_ODD(hw_videoport); 37 tidss_irq_update(tidss); 38 spin_unlock_irqrestore(&tidss->wait_lock, flags); 39 } 40 41 void tidss_irq_disable_vblank(struct drm_crtc *crtc) 42 { 43 struct drm_device *ddev = crtc->dev; 44 struct tidss_device *tidss = to_tidss(ddev); 45 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc); 46 u32 hw_videoport = tcrtc->hw_videoport; 47 unsigned long flags; 48 49 spin_lock_irqsave(&tidss->wait_lock, flags); 50 tidss->irq_mask &= ~(DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) | 51 DSS_IRQ_VP_VSYNC_ODD(hw_videoport)); 52 tidss_irq_update(tidss); 53 spin_unlock_irqrestore(&tidss->wait_lock, flags); 54 } 55 56 static irqreturn_t tidss_irq_handler(int irq, void *arg) 57 { 58 struct drm_device *ddev = (struct drm_device *)arg; 59 struct tidss_device *tidss = to_tidss(ddev); 60 unsigned int id; 61 dispc_irq_t irqstatus; 62 63 spin_lock(&tidss->wait_lock); 64 irqstatus = dispc_read_and_clear_irqstatus(tidss->dispc); 65 spin_unlock(&tidss->wait_lock); 66 67 for (id = 0; id < tidss->num_crtcs; id++) { 68 struct drm_crtc *crtc = tidss->crtcs[id]; 69 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc); 70 u32 hw_videoport = tcrtc->hw_videoport; 71 72 if (irqstatus & (DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) | 73 DSS_IRQ_VP_VSYNC_ODD(hw_videoport))) 74 tidss_crtc_vblank_irq(crtc); 75 76 if (irqstatus & (DSS_IRQ_VP_FRAME_DONE(hw_videoport))) 77 tidss_crtc_framedone_irq(crtc); 78 79 if (irqstatus & DSS_IRQ_VP_SYNC_LOST(hw_videoport)) 80 tidss_crtc_error_irq(crtc, irqstatus); 81 } 82 83 if (irqstatus & DSS_IRQ_DEVICE_OCP_ERR) 84 dev_err_ratelimited(tidss->dev, "OCP error\n"); 85 86 return IRQ_HANDLED; 87 } 88 89 void tidss_irq_resume(struct tidss_device *tidss) 90 { 91 unsigned long flags; 92 93 spin_lock_irqsave(&tidss->wait_lock, flags); 94 tidss_irq_update(tidss); 95 spin_unlock_irqrestore(&tidss->wait_lock, flags); 96 } 97 98 static void tidss_irq_preinstall(struct drm_device *ddev) 99 { 100 struct tidss_device *tidss = to_tidss(ddev); 101 102 spin_lock_init(&tidss->wait_lock); 103 104 tidss_runtime_get(tidss); 105 106 dispc_set_irqenable(tidss->dispc, 0); 107 dispc_read_and_clear_irqstatus(tidss->dispc); 108 109 tidss_runtime_put(tidss); 110 } 111 112 static void tidss_irq_postinstall(struct drm_device *ddev) 113 { 114 struct tidss_device *tidss = to_tidss(ddev); 115 unsigned long flags; 116 unsigned int i; 117 118 tidss_runtime_get(tidss); 119 120 spin_lock_irqsave(&tidss->wait_lock, flags); 121 122 tidss->irq_mask = DSS_IRQ_DEVICE_OCP_ERR; 123 124 for (i = 0; i < tidss->num_crtcs; ++i) { 125 struct tidss_crtc *tcrtc = to_tidss_crtc(tidss->crtcs[i]); 126 127 tidss->irq_mask |= DSS_IRQ_VP_SYNC_LOST(tcrtc->hw_videoport); 128 129 tidss->irq_mask |= DSS_IRQ_VP_FRAME_DONE(tcrtc->hw_videoport); 130 } 131 132 tidss_irq_update(tidss); 133 134 spin_unlock_irqrestore(&tidss->wait_lock, flags); 135 136 tidss_runtime_put(tidss); 137 } 138 139 int tidss_irq_install(struct drm_device *ddev, unsigned int irq) 140 { 141 int ret; 142 143 if (irq == IRQ_NOTCONNECTED) 144 return -ENOTCONN; 145 146 tidss_irq_preinstall(ddev); 147 148 ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev); 149 if (ret) 150 return ret; 151 152 tidss_irq_postinstall(ddev); 153 154 return 0; 155 } 156 157 void tidss_irq_uninstall(struct drm_device *ddev) 158 { 159 struct tidss_device *tidss = to_tidss(ddev); 160 161 tidss_runtime_get(tidss); 162 dispc_set_irqenable(tidss->dispc, 0); 163 tidss_runtime_put(tidss); 164 165 free_irq(tidss->irq, ddev); 166 } 167