tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */
19static 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
26void 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
41void 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
56static 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
87void 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
96int tidss_irq_install(struct drm_device *ddev, unsigned int irq)
97{
98 struct tidss_device *tidss = to_tidss(ddev);
99 int ret;
100
101 if (irq == IRQ_NOTCONNECTED)
102 return -ENOTCONN;
103
104 ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev);
105 if (ret)
106 return ret;
107
108 tidss->irq_mask = DSS_IRQ_DEVICE_OCP_ERR;
109
110 for (unsigned int i = 0; i < tidss->num_crtcs; ++i) {
111 struct tidss_crtc *tcrtc = to_tidss_crtc(tidss->crtcs[i]);
112
113 tidss->irq_mask |= DSS_IRQ_VP_SYNC_LOST(tcrtc->hw_videoport);
114
115 tidss->irq_mask |= DSS_IRQ_VP_FRAME_DONE(tcrtc->hw_videoport);
116 }
117
118 return 0;
119}
120
121void tidss_irq_uninstall(struct drm_device *ddev)
122{
123 struct tidss_device *tidss = to_tidss(ddev);
124
125 free_irq(tidss->irq, ddev);
126}