1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2013 Red Hat
4  * Author: Rob Clark <robdclark@gmail.com>
5  */
6 
7 #include <drm/drm_print.h>
8 #include <drm/drm_vblank.h>
9 
10 #include "msm_drv.h"
11 #include "mdp4_kms.h"
12 
13 void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
14 		uint32_t old_irqmask)
15 {
16 	mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_CLEAR,
17 		irqmask ^ (irqmask & old_irqmask));
18 	mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_ENABLE, irqmask);
19 }
20 
21 static void mdp4_irq_error_handler(struct mdp_irq *irq, uint32_t irqstatus)
22 {
23 	struct mdp4_kms *mdp4_kms = container_of(irq, struct mdp4_kms, error_handler);
24 	static DEFINE_RATELIMIT_STATE(rs, 5*HZ, 1);
25 	extern bool dumpstate;
26 
27 	DRM_ERROR_RATELIMITED("errors: %08x\n", irqstatus);
28 
29 	if (dumpstate && __ratelimit(&rs)) {
30 		struct drm_printer p = drm_info_printer(mdp4_kms->dev->dev);
31 		drm_state_dump(mdp4_kms->dev, &p);
32 	}
33 }
34 
35 void mdp4_irq_preinstall(struct msm_kms *kms)
36 {
37 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
38 	mdp4_enable(mdp4_kms);
39 	mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, 0xffffffff);
40 	mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
41 	mdp4_disable(mdp4_kms);
42 }
43 
44 int mdp4_irq_postinstall(struct msm_kms *kms)
45 {
46 	struct mdp_kms *mdp_kms = to_mdp_kms(kms);
47 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
48 	struct mdp_irq *error_handler = &mdp4_kms->error_handler;
49 
50 	error_handler->irq = mdp4_irq_error_handler;
51 	error_handler->irqmask = MDP4_IRQ_PRIMARY_INTF_UDERRUN |
52 			MDP4_IRQ_EXTERNAL_INTF_UDERRUN;
53 
54 	mdp_irq_register(mdp_kms, error_handler);
55 
56 	return 0;
57 }
58 
59 void mdp4_irq_uninstall(struct msm_kms *kms)
60 {
61 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
62 	mdp4_enable(mdp4_kms);
63 	mdp4_write(mdp4_kms, REG_MDP4_INTR_ENABLE, 0x00000000);
64 	mdp4_disable(mdp4_kms);
65 }
66 
67 irqreturn_t mdp4_irq(struct msm_kms *kms)
68 {
69 	struct mdp_kms *mdp_kms = to_mdp_kms(kms);
70 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(mdp_kms);
71 	struct drm_device *dev = mdp4_kms->dev;
72 	struct msm_drm_private *priv = dev->dev_private;
73 	unsigned int id;
74 	uint32_t status, enable;
75 
76 	enable = mdp4_read(mdp4_kms, REG_MDP4_INTR_ENABLE);
77 	status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS) & enable;
78 	mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, status);
79 
80 	VERB("status=%08x", status);
81 
82 	mdp_dispatch_irqs(mdp_kms, status);
83 
84 	for (id = 0; id < priv->num_crtcs; id++)
85 		if (status & mdp4_crtc_vblank(priv->crtcs[id]))
86 			drm_handle_vblank(dev, id);
87 
88 	return IRQ_HANDLED;
89 }
90 
91 int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
92 {
93 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
94 
95 	mdp4_enable(mdp4_kms);
96 	mdp_update_vblank_mask(to_mdp_kms(kms),
97 			mdp4_crtc_vblank(crtc), true);
98 	mdp4_disable(mdp4_kms);
99 
100 	return 0;
101 }
102 
103 void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
104 {
105 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
106 
107 	mdp4_enable(mdp4_kms);
108 	mdp_update_vblank_mask(to_mdp_kms(kms),
109 			mdp4_crtc_vblank(crtc), false);
110 	mdp4_disable(mdp4_kms);
111 }
112