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 irqstatus = dispc_read_and_clear_irqstatus(tidss->dispc); 64 65 for (id = 0; id < tidss->num_crtcs; id++) { 66 struct drm_crtc *crtc = tidss->crtcs[id]; 67 struct tidss_crtc *tcrtc = to_tidss_crtc(crtc); 68 u32 hw_videoport = tcrtc->hw_videoport; 69 70 if (irqstatus & (DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) | 71 DSS_IRQ_VP_VSYNC_ODD(hw_videoport))) 72 tidss_crtc_vblank_irq(crtc); 73 74 if (irqstatus & (DSS_IRQ_VP_FRAME_DONE(hw_videoport))) 75 tidss_crtc_framedone_irq(crtc); 76 77 if (irqstatus & DSS_IRQ_VP_SYNC_LOST(hw_videoport)) 78 tidss_crtc_error_irq(crtc, irqstatus); 79 } 80 81 if (irqstatus & DSS_IRQ_DEVICE_OCP_ERR) 82 dev_err_ratelimited(tidss->dev, "OCP error\n"); 83 84 return IRQ_HANDLED; 85 } 86 87 void tidss_irq_resume(struct tidss_device *tidss) 88 { 89 unsigned long flags; 90 91 spin_lock_irqsave(&tidss->wait_lock, flags); 92 tidss_irq_update(tidss); 93 spin_unlock_irqrestore(&tidss->wait_lock, flags); 94 } 95 96 static void tidss_irq_preinstall(struct drm_device *ddev) 97 { 98 struct tidss_device *tidss = to_tidss(ddev); 99 100 spin_lock_init(&tidss->wait_lock); 101 102 tidss_runtime_get(tidss); 103 104 dispc_set_irqenable(tidss->dispc, 0); 105 dispc_read_and_clear_irqstatus(tidss->dispc); 106 107 tidss_runtime_put(tidss); 108 } 109 110 static void tidss_irq_postinstall(struct drm_device *ddev) 111 { 112 struct tidss_device *tidss = to_tidss(ddev); 113 unsigned long flags; 114 unsigned int i; 115 116 tidss_runtime_get(tidss); 117 118 spin_lock_irqsave(&tidss->wait_lock, flags); 119 120 tidss->irq_mask = DSS_IRQ_DEVICE_OCP_ERR; 121 122 for (i = 0; i < tidss->num_crtcs; ++i) { 123 struct tidss_crtc *tcrtc = to_tidss_crtc(tidss->crtcs[i]); 124 125 tidss->irq_mask |= DSS_IRQ_VP_SYNC_LOST(tcrtc->hw_videoport); 126 127 tidss->irq_mask |= DSS_IRQ_VP_FRAME_DONE(tcrtc->hw_videoport); 128 } 129 130 tidss_irq_update(tidss); 131 132 spin_unlock_irqrestore(&tidss->wait_lock, flags); 133 134 tidss_runtime_put(tidss); 135 } 136 137 int tidss_irq_install(struct drm_device *ddev, unsigned int irq) 138 { 139 int ret; 140 141 if (irq == IRQ_NOTCONNECTED) 142 return -ENOTCONN; 143 144 tidss_irq_preinstall(ddev); 145 146 ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev); 147 if (ret) 148 return ret; 149 150 tidss_irq_postinstall(ddev); 151 152 return 0; 153 } 154 155 void tidss_irq_uninstall(struct drm_device *ddev) 156 { 157 struct tidss_device *tidss = to_tidss(ddev); 158 159 tidss_runtime_get(tidss); 160 dispc_set_irqenable(tidss->dispc, 0); 161 tidss_runtime_put(tidss); 162 163 free_irq(tidss->irq, ddev); 164 } 165