aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/bcm27xx/patches-5.4/950-0235-drm-vc4-Add-support-for-multiple-displays-to-fkms.patch
blob: cbba43bf2e79ee33494f5b3e0a2505b23eee2d14 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
From b7a52df8162e1eb55a8403e9e9af79c581206335 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 3 Apr 2019 17:15:45 +0100
Subject: [PATCH] drm: vc4: Add support for multiple displays to fkms

There is a slightly nasty hack in that all crtcs share the
same SMI interrupt from the firmware. This seems to currently
work well enough, but ought to be fixed at a later date.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 drivers/gpu/drm/vc4/vc4_firmware_kms.c | 162 +++++++++++++++++--------
 1 file changed, 113 insertions(+), 49 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_firmware_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_firmware_kms.c
@@ -31,6 +31,8 @@
 #include "vc_image_types.h"
 #include <soc/bcm2835/raspberrypi-firmware.h>
 
+#define PLANES_PER_CRTC		3
+
 struct set_plane {
 	u8 display;
 	u8 plane_id;
@@ -177,6 +179,7 @@ struct vc4_crtc {
 	struct drm_pending_vblank_event *event;
 	u32 overscan[4];
 	bool vblank_enabled;
+	u32 display_number;
 };
 
 static inline struct vc4_crtc *to_vc4_crtc(struct drm_crtc *crtc)
@@ -481,6 +484,7 @@ static const struct drm_plane_helper_fun
 
 static struct drm_plane *vc4_fkms_plane_init(struct drm_device *dev,
 					     enum drm_plane_type type,
+					     u8 display_num,
 					     u8 plane_id)
 {
 	struct drm_plane *plane = NULL;
@@ -544,7 +548,7 @@ static struct drm_plane *vc4_fkms_plane_
 	vc4_plane->mb.tag.tag = RPI_FIRMWARE_SET_PLANE;
 	vc4_plane->mb.tag.buf_size = sizeof(struct set_plane);
 	vc4_plane->mb.tag.req_resp_size = 0;
-	vc4_plane->mb.plane.display = 0;
+	vc4_plane->mb.plane.display = display_num;
 	vc4_plane->mb.plane.plane_id = plane_id;
 	vc4_plane->mb.plane.layer = default_zpos ? default_zpos : -127;
 
@@ -631,16 +635,20 @@ static void vc4_crtc_handle_page_flip(st
 
 static irqreturn_t vc4_crtc_irq_handler(int irq, void *data)
 {
-	struct vc4_crtc *vc4_crtc = data;
-	u32 stat = readl(vc4_crtc->regs + SMICS);
+	struct vc4_crtc **crtc_list = data;
+	int i;
+	u32 stat = readl(crtc_list[0]->regs + SMICS);
 	irqreturn_t ret = IRQ_NONE;
 
 	if (stat & SMICS_INTERRUPTS) {
-		writel(0, vc4_crtc->regs + SMICS);
-		if (vc4_crtc->vblank_enabled)
-			drm_crtc_handle_vblank(&vc4_crtc->base);
-		vc4_crtc_handle_page_flip(vc4_crtc);
-		ret = IRQ_HANDLED;
+		writel(0, crtc_list[0]->regs + SMICS);
+
+		for (i = 0; crtc_list[i]; i++) {
+			if (crtc_list[i]->vblank_enabled)
+				drm_crtc_handle_vblank(&crtc_list[i]->base);
+			vc4_crtc_handle_page_flip(crtc_list[i]);
+			ret = IRQ_HANDLED;
+		}
 	}
 
 	return ret;
@@ -837,66 +845,55 @@ static const struct drm_encoder_helper_f
 	.disable = vc4_fkms_encoder_disable,
 };
 
-static int vc4_fkms_bind(struct device *dev, struct device *master, void *data)
+static int vc4_fkms_create_screen(struct device *dev, struct drm_device *drm,
+				  int display_idx, int display_ref,
+				  struct vc4_crtc **ret_crtc)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct drm_device *drm = dev_get_drvdata(master);
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 	struct vc4_crtc *vc4_crtc;
 	struct vc4_fkms_encoder *vc4_encoder;
 	struct drm_crtc *crtc;
 	struct drm_plane *primary_plane, *overlay_plane, *cursor_plane;
 	struct drm_plane *destroy_plane, *temp;
-	struct device_node *firmware_node;
 	u32 blank = 1;
 	int ret;
 
-	vc4->firmware_kms = true;
-
-	/* firmware kms doesn't have precise a scanoutpos implementation, so
-	 * we can't do the precise vblank timestamp mode.
-	 */
-	drm->driver->get_scanout_position = NULL;
-	drm->driver->get_vblank_timestamp = NULL;
-
 	vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);
 	if (!vc4_crtc)
 		return -ENOMEM;
 	crtc = &vc4_crtc->base;
 
-	firmware_node = of_parse_phandle(dev->of_node, "brcm,firmware", 0);
-	vc4->firmware = rpi_firmware_get(firmware_node);
-	if (!vc4->firmware) {
-		DRM_DEBUG("Failed to get Raspberry Pi firmware reference.\n");
-		return -EPROBE_DEFER;
-	}
-	of_node_put(firmware_node);
-
-	/* Map the SMI interrupt reg */
-	vc4_crtc->regs = vc4_ioremap_regs(pdev, 0);
-	if (IS_ERR(vc4_crtc->regs))
-		return PTR_ERR(vc4_crtc->regs);
+	vc4_crtc->display_number = display_ref;
 
 	/* Blank the firmware provided framebuffer */
 	rpi_firmware_property(vc4->firmware,
 			      RPI_FIRMWARE_FRAMEBUFFER_BLANK,
 			      &blank, sizeof(blank));
 
-	primary_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_PRIMARY, 0);
+	primary_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_PRIMARY,
+					    display_ref,
+					    0 + (display_idx * PLANES_PER_CRTC)
+					   );
 	if (IS_ERR(primary_plane)) {
 		dev_err(dev, "failed to construct primary plane\n");
 		ret = PTR_ERR(primary_plane);
 		goto err;
 	}
 
-	overlay_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_OVERLAY, 1);
+	overlay_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_OVERLAY,
+					    display_ref,
+					    1 + (display_idx * PLANES_PER_CRTC)
+					   );
 	if (IS_ERR(overlay_plane)) {
 		dev_err(dev, "failed to construct overlay plane\n");
 		ret = PTR_ERR(overlay_plane);
 		goto err;
 	}
 
-	cursor_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_CURSOR, 2);
+	cursor_plane = vc4_fkms_plane_init(drm, DRM_PLANE_TYPE_CURSOR,
+					   display_ref,
+					   2 + (display_idx * PLANES_PER_CRTC)
+					  );
 	if (IS_ERR(cursor_plane)) {
 		dev_err(dev, "failed to construct cursor plane\n");
 		ret = PTR_ERR(cursor_plane);
@@ -923,13 +920,6 @@ static int vc4_fkms_bind(struct device *
 		goto err_destroy_encoder;
 	}
 
-	writel(0, vc4_crtc->regs + SMICS);
-	ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
-			       vc4_crtc_irq_handler, 0, "vc4 firmware kms",
-			       vc4_crtc);
-	if (ret)
-		goto err_destroy_connector;
-
 	ret = rpi_firmware_property(vc4->firmware,
 				    RPI_FIRMWARE_FRAMEBUFFER_GET_OVERSCAN,
 				    &vc4_crtc->overscan,
@@ -939,7 +929,7 @@ static int vc4_fkms_bind(struct device *
 		memset(&vc4_crtc->overscan, 0, sizeof(vc4_crtc->overscan));
 	}
 
-	platform_set_drvdata(pdev, vc4_crtc);
+	*ret_crtc = vc4_crtc;
 
 	return 0;
 
@@ -956,17 +946,91 @@ err:
 	return ret;
 }
 
+static int vc4_fkms_bind(struct device *dev, struct device *master, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct vc4_dev *vc4 = to_vc4_dev(drm);
+	struct device_node *firmware_node;
+	struct vc4_crtc **crtc_list;
+	u32 num_displays, display_num;
+	int ret;
+	const u32 display_num_lookup[] = {2, 7, 1};
+
+	vc4->firmware_kms = true;
+
+	/* firmware kms doesn't have precise a scanoutpos implementation, so
+	 * we can't do the precise vblank timestamp mode.
+	 */
+	drm->driver->get_scanout_position = NULL;
+	drm->driver->get_vblank_timestamp = NULL;
+
+	firmware_node = of_parse_phandle(dev->of_node, "brcm,firmware", 0);
+	vc4->firmware = rpi_firmware_get(firmware_node);
+	if (!vc4->firmware) {
+		DRM_DEBUG("Failed to get Raspberry Pi firmware reference.\n");
+		return -EPROBE_DEFER;
+	}
+	of_node_put(firmware_node);
+
+	ret = rpi_firmware_property(vc4->firmware,
+				    RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS,
+				    &num_displays, sizeof(u32));
+
+	/* If we fail to get the number of displays, or it returns 0, then
+	 * assume old firmware that doesn't have the mailbox call, so just
+	 * set one display
+	 */
+	if (ret || num_displays == 0) {
+		num_displays = 1;
+		DRM_WARN("Unable to determine number of displays's. Assuming 1\n");
+		ret = 0;
+	}
+
+	/* Allocate a list, with space for a NULL on the end */
+	crtc_list = devm_kzalloc(dev, sizeof(crtc_list) * (num_displays + 1),
+				 GFP_KERNEL);
+	if (!crtc_list)
+		return -ENOMEM;
+
+	for (display_num = 0; display_num < num_displays; display_num++) {
+		ret = vc4_fkms_create_screen(dev, drm, display_num,
+					     display_num_lookup[display_num],
+					     &crtc_list[display_num]);
+		if (ret)
+			DRM_ERROR("Oh dear, failed to create display %u\n",
+				  display_num);
+	}
+
+	/* Map the SMI interrupt reg */
+	crtc_list[0]->regs = vc4_ioremap_regs(pdev, 0);
+	if (IS_ERR(crtc_list[0]->regs))
+		DRM_ERROR("Oh dear, failed to map registers\n");
+
+	writel(0, crtc_list[0]->regs + SMICS);
+	ret = devm_request_irq(dev, platform_get_irq(pdev, 0),
+			       vc4_crtc_irq_handler, 0, "vc4 firmware kms",
+			       crtc_list);
+	if (ret)
+		DRM_ERROR("Oh dear, failed to register IRQ\n");
+
+	platform_set_drvdata(pdev, crtc_list);
+
+	return 0;
+}
+
 static void vc4_fkms_unbind(struct device *dev, struct device *master,
 			    void *data)
 {
-	struct drm_device *drm = dev_get_drvdata(master);
 	struct platform_device *pdev = to_platform_device(dev);
-	struct vc4_crtc *vc4_crtc = dev_get_drvdata(dev);
+	struct vc4_crtc **crtc_list = dev_get_drvdata(dev);
+	int i;
 
-	vc4_fkms_connector_destroy(vc4_crtc->connector);
-	vc4_fkms_encoder_destroy(vc4_crtc->encoder);
-	drm_atomic_helper_shutdown(drm);
-	drm_crtc_cleanup(&vc4_crtc->base);
+	for (i = 0; crtc_list[i]; i++) {
+		vc4_fkms_connector_destroy(crtc_list[i]->connector);
+		vc4_fkms_encoder_destroy(crtc_list[i]->encoder);
+		drm_crtc_cleanup(&crtc_list[i]->base);
+	}
 
 	platform_set_drvdata(pdev, NULL);
 }