1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
4 * Copyright (C) 2013 Red Hat
5 * Author: Rob Clark <robdclark@gmail.com>
6 */
7
8#ifndef __MSM_KMS_H__
9#define __MSM_KMS_H__
10
11#include <linux/clk.h>
12#include <linux/regulator/consumer.h>
13
14#include "msm_drv.h"
15
16#define MAX_PLANE	4
17
18/* As there are different display controller blocks depending on the
19 * snapdragon version, the kms support is split out and the appropriate
20 * implementation is loaded at runtime.  The kms module is responsible
21 * for constructing the appropriate planes/crtcs/encoders/connectors.
22 */
23struct msm_kms_funcs {
24	/* hw initialization: */
25	int (*hw_init)(struct msm_kms *kms);
26	/* irq handling: */
27	void (*irq_preinstall)(struct msm_kms *kms);
28	int (*irq_postinstall)(struct msm_kms *kms);
29	void (*irq_uninstall)(struct msm_kms *kms);
30	irqreturn_t (*irq)(struct msm_kms *kms);
31	int (*enable_vblank)(struct msm_kms *kms, struct drm_crtc *crtc);
32	void (*disable_vblank)(struct msm_kms *kms, struct drm_crtc *crtc);
33
34	/*
35	 * Atomic commit handling:
36	 *
37	 * Note that in the case of async commits, the funcs which take
38	 * a crtc_mask (ie. ->flush_commit(), and ->complete_commit())
39	 * might not be evenly balanced with ->prepare_commit(), however
40	 * each crtc that effected by a ->prepare_commit() (potentially
41	 * multiple times) will eventually (at end of vsync period) be
42	 * flushed and completed.
43	 *
44	 * This has some implications about tracking of cleanup state,
45	 * for example SMP blocks to release after commit completes.  Ie.
46	 * cleanup state should be also duplicated in the various
47	 * duplicate_state() methods, as the current cleanup state at
48	 * ->complete_commit() time may have accumulated cleanup work
49	 * from multiple commits.
50	 */
51
52	/**
53	 * Enable/disable power/clks needed for hw access done in other
54	 * commit related methods.
55	 *
56	 * If mdp4 is migrated to runpm, we could probably drop these
57	 * and use runpm directly.
58	 */
59	void (*enable_commit)(struct msm_kms *kms);
60	void (*disable_commit)(struct msm_kms *kms);
61
62	/**
63	 * Prepare for atomic commit.  This is called after any previous
64	 * (async or otherwise) commit has completed.
65	 */
66	void (*prepare_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
67
68	/**
69	 * Flush an atomic commit.  This is called after the hardware
70	 * updates have already been pushed down to effected planes/
71	 * crtcs/encoders/connectors.
72	 */
73	void (*flush_commit)(struct msm_kms *kms, unsigned crtc_mask);
74
75	/**
76	 * Wait for any in-progress flush to complete on the specified
77	 * crtcs.  This should not block if there is no in-progress
78	 * commit (ie. don't just wait for a vblank), as it will also
79	 * be called before ->prepare_commit() to ensure any potential
80	 * "async" commit has completed.
81	 */
82	void (*wait_flush)(struct msm_kms *kms, unsigned crtc_mask);
83
84	/**
85	 * Clean up after commit is completed.  This is called after
86	 * ->wait_flush(), to give the backend a chance to do any
87	 * post-commit cleanup.
88	 */
89	void (*complete_commit)(struct msm_kms *kms, unsigned crtc_mask);
90
91	/*
92	 * Format handling:
93	 */
94
95	/* get msm_format w/ optional format modifiers from drm_mode_fb_cmd2 */
96	const struct msm_format *(*get_format)(struct msm_kms *kms,
97					const uint32_t format,
98					const uint64_t modifiers);
99	/* do format checking on format modified through fb_cmd2 modifiers */
100	int (*check_modified_format)(const struct msm_kms *kms,
101			const struct msm_format *msm_fmt,
102			const struct drm_mode_fb_cmd2 *cmd,
103			struct drm_gem_object **bos);
104
105	/* misc: */
106	long (*round_pixclk)(struct msm_kms *kms, unsigned long rate,
107			struct drm_encoder *encoder);
108	int (*set_split_display)(struct msm_kms *kms,
109			struct drm_encoder *encoder,
110			struct drm_encoder *slave_encoder,
111			bool is_cmd_mode);
112	/* cleanup: */
113	void (*destroy)(struct msm_kms *kms);
114
115	/* snapshot: */
116	void (*snapshot)(struct msm_disp_state *disp_state, struct msm_kms *kms);
117
118#ifdef CONFIG_DEBUG_FS
119	/* debugfs: */
120	int (*debugfs_init)(struct msm_kms *kms, struct drm_minor *minor);
121#endif
122};
123
124struct msm_kms;
125
126/*
127 * A per-crtc timer for pending async atomic flushes.  Scheduled to expire
128 * shortly before vblank to flush pending async updates.
129 */
130struct msm_pending_timer {
131	struct msm_hrtimer_work work;
132	struct kthread_worker *worker;
133	struct msm_kms *kms;
134	unsigned crtc_idx;
135};
136
137struct msm_kms {
138	const struct msm_kms_funcs *funcs;
139	struct drm_device *dev;
140
141	/* irq number to be passed on to msm_irq_install */
142	int irq;
143	bool irq_requested;
144
145	/* mapper-id used to request GEM buffer mapped for scanout: */
146	struct msm_gem_address_space *aspace;
147
148	/* disp snapshot support */
149	struct kthread_worker *dump_worker;
150	struct kthread_work dump_work;
151	struct mutex dump_mutex;
152
153	/*
154	 * For async commit, where ->flush_commit() and later happens
155	 * from the crtc's pending_timer close to end of the frame:
156	 */
157	struct mutex commit_lock[MAX_CRTCS];
158	unsigned pending_crtc_mask;
159	struct msm_pending_timer pending_timers[MAX_CRTCS];
160};
161
162static inline int msm_kms_init(struct msm_kms *kms,
163		const struct msm_kms_funcs *funcs)
164{
165	unsigned i, ret;
166
167	for (i = 0; i < ARRAY_SIZE(kms->commit_lock); i++)
168		mutex_init(&kms->commit_lock[i]);
169
170	kms->funcs = funcs;
171
172	for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++) {
173		ret = msm_atomic_init_pending_timer(&kms->pending_timers[i], kms, i);
174		if (ret) {
175			return ret;
176		}
177	}
178
179	return 0;
180}
181
182static inline void msm_kms_destroy(struct msm_kms *kms)
183{
184	unsigned i;
185
186	for (i = 0; i < ARRAY_SIZE(kms->pending_timers); i++)
187		msm_atomic_destroy_pending_timer(&kms->pending_timers[i]);
188}
189
190#define for_each_crtc_mask(dev, crtc, crtc_mask) \
191	drm_for_each_crtc(crtc, dev) \
192		for_each_if (drm_crtc_mask(crtc) & (crtc_mask))
193
194#define for_each_crtc_mask_reverse(dev, crtc, crtc_mask) \
195	drm_for_each_crtc_reverse(crtc, dev) \
196		for_each_if (drm_crtc_mask(crtc) & (crtc_mask))
197
198#endif /* __MSM_KMS_H__ */
199