Linux 4.1.16
[linux/fpc-iii.git] / drivers / gpu / drm / sti / sti_dvo.c
bloba9b678af85a6f315716fa82871674519e017b9f3
1 /*
2 * Copyright (C) STMicroelectronics SA 2014
3 * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics.
4 * License terms: GNU General Public License (GPL), version 2
5 */
7 #include <linux/clk.h>
8 #include <linux/component.h>
9 #include <linux/module.h>
10 #include <linux/of_gpio.h>
11 #include <linux/platform_device.h>
13 #include <drm/drmP.h>
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_crtc_helper.h>
16 #include <drm/drm_panel.h>
18 #include "sti_awg_utils.h"
19 #include "sti_mixer.h"
21 /* DVO registers */
22 #define DVO_AWG_DIGSYNC_CTRL 0x0000
23 #define DVO_DOF_CFG 0x0004
24 #define DVO_LUT_PROG_LOW 0x0008
25 #define DVO_LUT_PROG_MID 0x000C
26 #define DVO_LUT_PROG_HIGH 0x0010
27 #define DVO_DIGSYNC_INSTR_I 0x0100
29 #define DVO_AWG_CTRL_EN BIT(0)
30 #define DVO_AWG_FRAME_BASED_SYNC BIT(2)
32 #define DVO_DOF_EN_LOWBYTE BIT(0)
33 #define DVO_DOF_EN_MIDBYTE BIT(1)
34 #define DVO_DOF_EN_HIGHBYTE BIT(2)
35 #define DVO_DOF_EN BIT(6)
36 #define DVO_DOF_MOD_COUNT_SHIFT 8
38 #define DVO_LUT_ZERO 0
39 #define DVO_LUT_Y_G 1
40 #define DVO_LUT_Y_G_DEL 2
41 #define DVO_LUT_CB_B 3
42 #define DVO_LUT_CB_B_DEL 4
43 #define DVO_LUT_CR_R 5
44 #define DVO_LUT_CR_R_DEL 6
45 #define DVO_LUT_HOLD 7
47 struct dvo_config {
48 u32 flags;
49 u32 lowbyte;
50 u32 midbyte;
51 u32 highbyte;
52 int (*awg_fwgen_fct)(
53 struct awg_code_generation_params *fw_gen_params,
54 struct awg_timing *timing);
57 static struct dvo_config rgb_24bit_de_cfg = {
58 .flags = (0L << DVO_DOF_MOD_COUNT_SHIFT),
59 .lowbyte = DVO_LUT_CR_R,
60 .midbyte = DVO_LUT_Y_G,
61 .highbyte = DVO_LUT_CB_B,
62 .awg_fwgen_fct = sti_awg_generate_code_data_enable_mode,
65 /**
66 * STI digital video output structure
68 * @dev: driver device
69 * @drm_dev: pointer to drm device
70 * @mode: current display mode selected
71 * @regs: dvo registers
72 * @clk_pix: pixel clock for dvo
73 * @clk: clock for dvo
74 * @clk_main_parent: dvo parent clock if main path used
75 * @clk_aux_parent: dvo parent clock if aux path used
76 * @panel_node: panel node reference from device tree
77 * @panel: reference to the panel connected to the dvo
78 * @enabled: true if dvo is enabled else false
79 * @encoder: drm_encoder it is bound
81 struct sti_dvo {
82 struct device dev;
83 struct drm_device *drm_dev;
84 struct drm_display_mode mode;
85 void __iomem *regs;
86 struct clk *clk_pix;
87 struct clk *clk;
88 struct clk *clk_main_parent;
89 struct clk *clk_aux_parent;
90 struct device_node *panel_node;
91 struct drm_panel *panel;
92 struct dvo_config *config;
93 bool enabled;
94 struct drm_encoder *encoder;
95 struct drm_bridge *bridge;
98 struct sti_dvo_connector {
99 struct drm_connector drm_connector;
100 struct drm_encoder *encoder;
101 struct sti_dvo *dvo;
104 #define to_sti_dvo_connector(x) \
105 container_of(x, struct sti_dvo_connector, drm_connector)
107 #define BLANKING_LEVEL 16
108 int dvo_awg_generate_code(struct sti_dvo *dvo, u8 *ram_size, u32 *ram_code)
110 struct drm_display_mode *mode = &dvo->mode;
111 struct dvo_config *config = dvo->config;
112 struct awg_code_generation_params fw_gen_params;
113 struct awg_timing timing;
115 fw_gen_params.ram_code = ram_code;
116 fw_gen_params.instruction_offset = 0;
118 timing.total_lines = mode->vtotal;
119 timing.active_lines = mode->vdisplay;
120 timing.blanking_lines = mode->vsync_start - mode->vdisplay;
121 timing.trailing_lines = mode->vtotal - mode->vsync_start;
122 timing.total_pixels = mode->htotal;
123 timing.active_pixels = mode->hdisplay;
124 timing.blanking_pixels = mode->hsync_start - mode->hdisplay;
125 timing.trailing_pixels = mode->htotal - mode->hsync_start;
126 timing.blanking_level = BLANKING_LEVEL;
128 if (config->awg_fwgen_fct(&fw_gen_params, &timing)) {
129 DRM_ERROR("AWG firmware not properly generated\n");
130 return -EINVAL;
133 *ram_size = fw_gen_params.instruction_offset;
135 return 0;
138 /* Configure AWG, writing instructions
140 * @dvo: pointer to DVO structure
141 * @awg_ram_code: pointer to AWG instructions table
142 * @nb: nb of AWG instructions
144 static void dvo_awg_configure(struct sti_dvo *dvo, u32 *awg_ram_code, int nb)
146 int i;
148 DRM_DEBUG_DRIVER("\n");
150 for (i = 0; i < nb; i++)
151 writel(awg_ram_code[i],
152 dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4);
153 for (i = nb; i < AWG_MAX_INST; i++)
154 writel(0, dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4);
156 writel(DVO_AWG_CTRL_EN, dvo->regs + DVO_AWG_DIGSYNC_CTRL);
159 static void sti_dvo_disable(struct drm_bridge *bridge)
161 struct sti_dvo *dvo = bridge->driver_private;
163 if (!dvo->enabled)
164 return;
166 DRM_DEBUG_DRIVER("\n");
168 if (dvo->config->awg_fwgen_fct)
169 writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL);
171 writel(0x00000000, dvo->regs + DVO_DOF_CFG);
173 if (dvo->panel)
174 dvo->panel->funcs->disable(dvo->panel);
176 /* Disable/unprepare dvo clock */
177 clk_disable_unprepare(dvo->clk_pix);
178 clk_disable_unprepare(dvo->clk);
180 dvo->enabled = false;
183 static void sti_dvo_pre_enable(struct drm_bridge *bridge)
185 struct sti_dvo *dvo = bridge->driver_private;
186 struct dvo_config *config = dvo->config;
187 u32 val;
189 DRM_DEBUG_DRIVER("\n");
191 if (dvo->enabled)
192 return;
194 /* Make sure DVO is disabled */
195 writel(0x00000000, dvo->regs + DVO_DOF_CFG);
196 writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL);
198 if (config->awg_fwgen_fct) {
199 u8 nb_instr;
200 u32 awg_ram_code[AWG_MAX_INST];
201 /* Configure AWG */
202 if (!dvo_awg_generate_code(dvo, &nb_instr, awg_ram_code))
203 dvo_awg_configure(dvo, awg_ram_code, nb_instr);
204 else
205 return;
208 /* Prepare/enable clocks */
209 if (clk_prepare_enable(dvo->clk_pix))
210 DRM_ERROR("Failed to prepare/enable dvo_pix clk\n");
211 if (clk_prepare_enable(dvo->clk))
212 DRM_ERROR("Failed to prepare/enable dvo clk\n");
214 if (dvo->panel)
215 dvo->panel->funcs->enable(dvo->panel);
217 /* Set LUT */
218 writel(config->lowbyte, dvo->regs + DVO_LUT_PROG_LOW);
219 writel(config->midbyte, dvo->regs + DVO_LUT_PROG_MID);
220 writel(config->highbyte, dvo->regs + DVO_LUT_PROG_HIGH);
222 /* Digital output formatter config */
223 val = (config->flags | DVO_DOF_EN);
224 writel(val, dvo->regs + DVO_DOF_CFG);
226 dvo->enabled = true;
229 static void sti_dvo_set_mode(struct drm_bridge *bridge,
230 struct drm_display_mode *mode,
231 struct drm_display_mode *adjusted_mode)
233 struct sti_dvo *dvo = bridge->driver_private;
234 struct sti_mixer *mixer = to_sti_mixer(dvo->encoder->crtc);
235 int rate = mode->clock * 1000;
236 struct clk *clkp;
237 int ret;
239 DRM_DEBUG_DRIVER("\n");
241 memcpy(&dvo->mode, mode, sizeof(struct drm_display_mode));
243 /* According to the path used (main or aux), the dvo clocks should
244 * have a different parent clock. */
245 if (mixer->id == STI_MIXER_MAIN)
246 clkp = dvo->clk_main_parent;
247 else
248 clkp = dvo->clk_aux_parent;
250 if (clkp) {
251 clk_set_parent(dvo->clk_pix, clkp);
252 clk_set_parent(dvo->clk, clkp);
255 /* DVO clocks = compositor clock */
256 ret = clk_set_rate(dvo->clk_pix, rate);
257 if (ret < 0) {
258 DRM_ERROR("Cannot set rate (%dHz) for dvo_pix clk\n", rate);
259 return;
262 ret = clk_set_rate(dvo->clk, rate);
263 if (ret < 0) {
264 DRM_ERROR("Cannot set rate (%dHz) for dvo clk\n", rate);
265 return;
268 /* For now, we only support 24bit data enable (DE) synchro format */
269 dvo->config = &rgb_24bit_de_cfg;
272 static void sti_dvo_bridge_nope(struct drm_bridge *bridge)
274 /* do nothing */
277 static const struct drm_bridge_funcs sti_dvo_bridge_funcs = {
278 .pre_enable = sti_dvo_pre_enable,
279 .enable = sti_dvo_bridge_nope,
280 .disable = sti_dvo_disable,
281 .post_disable = sti_dvo_bridge_nope,
282 .mode_set = sti_dvo_set_mode,
285 static int sti_dvo_connector_get_modes(struct drm_connector *connector)
287 struct sti_dvo_connector *dvo_connector
288 = to_sti_dvo_connector(connector);
289 struct sti_dvo *dvo = dvo_connector->dvo;
291 if (dvo->panel)
292 return dvo->panel->funcs->get_modes(dvo->panel);
294 return 0;
297 #define CLK_TOLERANCE_HZ 50
299 static int sti_dvo_connector_mode_valid(struct drm_connector *connector,
300 struct drm_display_mode *mode)
302 int target = mode->clock * 1000;
303 int target_min = target - CLK_TOLERANCE_HZ;
304 int target_max = target + CLK_TOLERANCE_HZ;
305 int result;
306 struct sti_dvo_connector *dvo_connector
307 = to_sti_dvo_connector(connector);
308 struct sti_dvo *dvo = dvo_connector->dvo;
310 result = clk_round_rate(dvo->clk_pix, target);
312 DRM_DEBUG_DRIVER("target rate = %d => available rate = %d\n",
313 target, result);
315 if ((result < target_min) || (result > target_max)) {
316 DRM_DEBUG_DRIVER("dvo pixclk=%d not supported\n", target);
317 return MODE_BAD;
320 return MODE_OK;
323 struct drm_encoder *sti_dvo_best_encoder(struct drm_connector *connector)
325 struct sti_dvo_connector *dvo_connector
326 = to_sti_dvo_connector(connector);
328 /* Best encoder is the one associated during connector creation */
329 return dvo_connector->encoder;
332 static struct drm_connector_helper_funcs sti_dvo_connector_helper_funcs = {
333 .get_modes = sti_dvo_connector_get_modes,
334 .mode_valid = sti_dvo_connector_mode_valid,
335 .best_encoder = sti_dvo_best_encoder,
338 static enum drm_connector_status
339 sti_dvo_connector_detect(struct drm_connector *connector, bool force)
341 struct sti_dvo_connector *dvo_connector
342 = to_sti_dvo_connector(connector);
343 struct sti_dvo *dvo = dvo_connector->dvo;
345 DRM_DEBUG_DRIVER("\n");
347 if (!dvo->panel)
348 dvo->panel = of_drm_find_panel(dvo->panel_node);
350 if (dvo->panel)
351 if (!drm_panel_attach(dvo->panel, connector))
352 return connector_status_connected;
354 return connector_status_disconnected;
357 static void sti_dvo_connector_destroy(struct drm_connector *connector)
359 struct sti_dvo_connector *dvo_connector
360 = to_sti_dvo_connector(connector);
362 drm_connector_unregister(connector);
363 drm_connector_cleanup(connector);
364 kfree(dvo_connector);
367 static struct drm_connector_funcs sti_dvo_connector_funcs = {
368 .dpms = drm_atomic_helper_connector_dpms,
369 .fill_modes = drm_helper_probe_single_connector_modes,
370 .detect = sti_dvo_connector_detect,
371 .destroy = sti_dvo_connector_destroy,
372 .reset = drm_atomic_helper_connector_reset,
373 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
374 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
377 static struct drm_encoder *sti_dvo_find_encoder(struct drm_device *dev)
379 struct drm_encoder *encoder;
381 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
382 if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS)
383 return encoder;
386 return NULL;
389 static int sti_dvo_bind(struct device *dev, struct device *master, void *data)
391 struct sti_dvo *dvo = dev_get_drvdata(dev);
392 struct drm_device *drm_dev = data;
393 struct drm_encoder *encoder;
394 struct sti_dvo_connector *connector;
395 struct drm_connector *drm_connector;
396 struct drm_bridge *bridge;
397 int err;
399 /* Set the drm device handle */
400 dvo->drm_dev = drm_dev;
402 encoder = sti_dvo_find_encoder(drm_dev);
403 if (!encoder)
404 return -ENOMEM;
406 connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL);
407 if (!connector)
408 return -ENOMEM;
410 connector->dvo = dvo;
412 bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
413 if (!bridge)
414 return -ENOMEM;
416 bridge->driver_private = dvo;
417 bridge->funcs = &sti_dvo_bridge_funcs;
418 bridge->of_node = dvo->dev.of_node;
419 err = drm_bridge_add(bridge);
420 if (err) {
421 DRM_ERROR("Failed to add bridge\n");
422 return err;
425 err = drm_bridge_attach(drm_dev, bridge);
426 if (err) {
427 DRM_ERROR("Failed to attach bridge\n");
428 return err;
431 dvo->bridge = bridge;
432 encoder->bridge = bridge;
433 connector->encoder = encoder;
434 dvo->encoder = encoder;
436 drm_connector = (struct drm_connector *)connector;
438 drm_connector->polled = DRM_CONNECTOR_POLL_HPD;
440 drm_connector_init(drm_dev, drm_connector,
441 &sti_dvo_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
442 drm_connector_helper_add(drm_connector,
443 &sti_dvo_connector_helper_funcs);
445 err = drm_connector_register(drm_connector);
446 if (err)
447 goto err_connector;
449 err = drm_mode_connector_attach_encoder(drm_connector, encoder);
450 if (err) {
451 DRM_ERROR("Failed to attach a connector to a encoder\n");
452 goto err_sysfs;
455 return 0;
457 err_sysfs:
458 drm_connector_unregister(drm_connector);
459 err_connector:
460 drm_bridge_remove(bridge);
461 drm_connector_cleanup(drm_connector);
462 return -EINVAL;
465 static void sti_dvo_unbind(struct device *dev,
466 struct device *master, void *data)
468 struct sti_dvo *dvo = dev_get_drvdata(dev);
470 drm_bridge_remove(dvo->bridge);
473 static const struct component_ops sti_dvo_ops = {
474 .bind = sti_dvo_bind,
475 .unbind = sti_dvo_unbind,
478 static int sti_dvo_probe(struct platform_device *pdev)
480 struct device *dev = &pdev->dev;
481 struct sti_dvo *dvo;
482 struct resource *res;
483 struct device_node *np = dev->of_node;
485 DRM_INFO("%s\n", __func__);
487 dvo = devm_kzalloc(dev, sizeof(*dvo), GFP_KERNEL);
488 if (!dvo) {
489 DRM_ERROR("Failed to allocate memory for DVO\n");
490 return -ENOMEM;
493 dvo->dev = pdev->dev;
495 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dvo-reg");
496 if (!res) {
497 DRM_ERROR("Invalid dvo resource\n");
498 return -ENOMEM;
500 dvo->regs = devm_ioremap_nocache(dev, res->start,
501 resource_size(res));
502 if (IS_ERR(dvo->regs))
503 return PTR_ERR(dvo->regs);
505 dvo->clk_pix = devm_clk_get(dev, "dvo_pix");
506 if (IS_ERR(dvo->clk_pix)) {
507 DRM_ERROR("Cannot get dvo_pix clock\n");
508 return PTR_ERR(dvo->clk_pix);
511 dvo->clk = devm_clk_get(dev, "dvo");
512 if (IS_ERR(dvo->clk)) {
513 DRM_ERROR("Cannot get dvo clock\n");
514 return PTR_ERR(dvo->clk);
517 dvo->clk_main_parent = devm_clk_get(dev, "main_parent");
518 if (IS_ERR(dvo->clk_main_parent)) {
519 DRM_DEBUG_DRIVER("Cannot get main_parent clock\n");
520 dvo->clk_main_parent = NULL;
523 dvo->clk_aux_parent = devm_clk_get(dev, "aux_parent");
524 if (IS_ERR(dvo->clk_aux_parent)) {
525 DRM_DEBUG_DRIVER("Cannot get aux_parent clock\n");
526 dvo->clk_aux_parent = NULL;
529 dvo->panel_node = of_parse_phandle(np, "sti,panel", 0);
530 if (!dvo->panel_node)
531 DRM_ERROR("No panel associated to the dvo output\n");
533 platform_set_drvdata(pdev, dvo);
535 return component_add(&pdev->dev, &sti_dvo_ops);
538 static int sti_dvo_remove(struct platform_device *pdev)
540 component_del(&pdev->dev, &sti_dvo_ops);
541 return 0;
544 static struct of_device_id dvo_of_match[] = {
545 { .compatible = "st,stih407-dvo", },
546 { /* end node */ }
548 MODULE_DEVICE_TABLE(of, dvo_of_match);
550 struct platform_driver sti_dvo_driver = {
551 .driver = {
552 .name = "sti-dvo",
553 .owner = THIS_MODULE,
554 .of_match_table = dvo_of_match,
556 .probe = sti_dvo_probe,
557 .remove = sti_dvo_remove,
560 module_platform_driver(sti_dvo_driver);
562 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
563 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
564 MODULE_LICENSE("GPL");