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 */
tidss_irq_update(struct tidss_device * tidss)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
tidss_irq_enable_vblank(struct drm_crtc * crtc)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
tidss_irq_disable_vblank(struct drm_crtc * crtc)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
tidss_irq_handler(int irq,void * arg)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
tidss_irq_resume(struct tidss_device * tidss)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
tidss_irq_preinstall(struct drm_device * ddev)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
tidss_irq_postinstall(struct drm_device * ddev)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
tidss_irq_install(struct drm_device * ddev,unsigned int irq)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
tidss_irq_uninstall(struct drm_device * ddev)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