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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright © 2018-2020 Intel Corporation
4 */
5
6#include <linux/clk.h>
7#include <linux/module.h>
8#include <linux/of_graph.h>
9#include <linux/of_platform.h>
10#include <linux/of_reserved_mem.h>
11#include <linux/mfd/syscon.h>
12#include <linux/platform_device.h>
13#include <linux/pm_runtime.h>
14#include <linux/regmap.h>
15
16#include <drm/drm_atomic_helper.h>
17#include <drm/drm_drv.h>
18#include <drm/drm_gem_cma_helper.h>
19#include <drm/drm_gem_framebuffer_helper.h>
20#include <drm/drm_irq.h>
21#include <drm/drm_probe_helper.h>
22#include <drm/drm_vblank.h>
23
24#include "kmb_drv.h"
25#include "kmb_dsi.h"
26#include "kmb_regs.h"
27
28static int kmb_display_clk_enable(struct kmb_drm_private *kmb)
29{
30 int ret = 0;
31
32 ret = clk_prepare_enable(kmb->kmb_clk.clk_lcd);
33 if (ret) {
34 drm_err(&kmb->drm, "Failed to enable LCD clock: %d\n", ret);
35 return ret;
36 }
37 DRM_INFO("SUCCESS : enabled LCD clocks\n");
38 return 0;
39}
40
41static int kmb_initialize_clocks(struct kmb_drm_private *kmb, struct device *dev)
42{
43 int ret = 0;
44 struct regmap *msscam;
45
46 kmb->kmb_clk.clk_lcd = devm_clk_get(dev, "clk_lcd");
47 if (IS_ERR(kmb->kmb_clk.clk_lcd)) {
48 drm_err(&kmb->drm, "clk_get() failed clk_lcd\n");
49 return PTR_ERR(kmb->kmb_clk.clk_lcd);
50 }
51
52 kmb->kmb_clk.clk_pll0 = devm_clk_get(dev, "clk_pll0");
53 if (IS_ERR(kmb->kmb_clk.clk_pll0)) {
54 drm_err(&kmb->drm, "clk_get() failed clk_pll0 ");
55 return PTR_ERR(kmb->kmb_clk.clk_pll0);
56 }
57 kmb->sys_clk_mhz = clk_get_rate(kmb->kmb_clk.clk_pll0) / 1000000;
58 drm_info(&kmb->drm, "system clk = %d Mhz", kmb->sys_clk_mhz);
59
60 ret = kmb_dsi_clk_init(kmb->kmb_dsi);
61
62 /* Set LCD clock to 200 Mhz */
63 clk_set_rate(kmb->kmb_clk.clk_lcd, KMB_LCD_DEFAULT_CLK);
64 if (clk_get_rate(kmb->kmb_clk.clk_lcd) != KMB_LCD_DEFAULT_CLK) {
65 drm_err(&kmb->drm, "failed to set to clk_lcd to %d\n",
66 KMB_LCD_DEFAULT_CLK);
67 return -1;
68 }
69 drm_dbg(&kmb->drm, "clk_lcd = %ld\n", clk_get_rate(kmb->kmb_clk.clk_lcd));
70
71 ret = kmb_display_clk_enable(kmb);
72 if (ret)
73 return ret;
74
75 msscam = syscon_regmap_lookup_by_compatible("intel,keembay-msscam");
76 if (IS_ERR(msscam)) {
77 drm_err(&kmb->drm, "failed to get msscam syscon");
78 return -1;
79 }
80
81 /* Enable MSS_CAM_CLK_CTRL for MIPI TX and LCD */
82 regmap_update_bits(msscam, MSS_CAM_CLK_CTRL, 0x1fff, 0x1fff);
83 regmap_update_bits(msscam, MSS_CAM_RSTN_CTRL, 0xffffffff, 0xffffffff);
84 return 0;
85}
86
87static void kmb_display_clk_disable(struct kmb_drm_private *kmb)
88{
89 clk_disable_unprepare(kmb->kmb_clk.clk_lcd);
90}
91
92static void __iomem *kmb_map_mmio(struct drm_device *drm,
93 struct platform_device *pdev,
94 char *name)
95{
96 struct resource *res;
97 void __iomem *mem;
98
99 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, name);
100 if (!res) {
101 drm_err(drm, "failed to get resource for %s", name);
102 return ERR_PTR(-ENOMEM);
103 }
104 mem = devm_ioremap_resource(drm->dev, res);
105 if (IS_ERR(mem))
106 drm_err(drm, "failed to ioremap %s registers", name);
107 return mem;
108}
109
110static int kmb_hw_init(struct drm_device *drm, unsigned long flags)
111{
112 struct kmb_drm_private *kmb = to_kmb(drm);
113 struct platform_device *pdev = to_platform_device(drm->dev);
114 int irq_lcd;
115 int ret = 0;
116
117 /* Map LCD MMIO registers */
118 kmb->lcd_mmio = kmb_map_mmio(drm, pdev, "lcd");
119 if (IS_ERR(kmb->lcd_mmio)) {
120 drm_err(&kmb->drm, "failed to map LCD registers\n");
121 return -ENOMEM;
122 }
123
124 /* Map MIPI MMIO registers */
125 ret = kmb_dsi_map_mmio(kmb->kmb_dsi);
126 if (ret)
127 return ret;
128
129 /* Enable display clocks */
130 kmb_initialize_clocks(kmb, &pdev->dev);
131
132 /* Register irqs here - section 17.3 in databook
133 * lists LCD at 79 and 82 for MIPI under MSS CPU -
134 * firmware has redirected 79 to A53 IRQ 33
135 */
136
137 /* Allocate LCD interrupt resources */
138 irq_lcd = platform_get_irq(pdev, 0);
139 if (irq_lcd < 0) {
140 ret = irq_lcd;
141 drm_err(&kmb->drm, "irq_lcd not found");
142 goto setup_fail;
143 }
144
145 /* Get the optional framebuffer memory resource */
146 ret = of_reserved_mem_device_init(drm->dev);
147 if (ret && ret != -ENODEV)
148 return ret;
149
150 spin_lock_init(&kmb->irq_lock);
151
152 kmb->irq_lcd = irq_lcd;
153
154 return 0;
155
156 setup_fail:
157 of_reserved_mem_device_release(drm->dev);
158
159 return ret;
160}
161
162static const struct drm_mode_config_funcs kmb_mode_config_funcs = {
163 .fb_create = drm_gem_fb_create,
164 .atomic_check = drm_atomic_helper_check,
165 .atomic_commit = drm_atomic_helper_commit,
166};
167
168static int kmb_setup_mode_config(struct drm_device *drm)
169{
170 int ret;
171 struct kmb_drm_private *kmb = to_kmb(drm);
172
173 ret = drmm_mode_config_init(drm);
174 if (ret)
175 return ret;
176 drm->mode_config.min_width = KMB_FB_MIN_WIDTH;
177 drm->mode_config.min_height = KMB_FB_MIN_HEIGHT;
178 drm->mode_config.max_width = KMB_FB_MAX_WIDTH;
179 drm->mode_config.max_height = KMB_FB_MAX_HEIGHT;
180 drm->mode_config.funcs = &kmb_mode_config_funcs;
181
182 ret = kmb_setup_crtc(drm);
183 if (ret < 0) {
184 drm_err(drm, "failed to create crtc\n");
185 return ret;
186 }
187 ret = kmb_dsi_encoder_init(drm, kmb->kmb_dsi);
188 /* Set the CRTC's port so that the encoder component can find it */
189 kmb->crtc.port = of_graph_get_port_by_id(drm->dev->of_node, 0);
190 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
191 if (ret < 0) {
192 drm_err(drm, "failed to initialize vblank\n");
193 pm_runtime_disable(drm->dev);
194 return ret;
195 }
196
197 drm_mode_config_reset(drm);
198 return 0;
199}
200
201static irqreturn_t handle_lcd_irq(struct drm_device *dev)
202{
203 unsigned long status, val, val1;
204 int plane_id, dma0_state, dma1_state;
205 struct kmb_drm_private *kmb = to_kmb(dev);
206 u32 ctrl = 0;
207
208 status = kmb_read_lcd(kmb, LCD_INT_STATUS);
209
210 spin_lock(&kmb->irq_lock);
211 if (status & LCD_INT_EOF) {
212 kmb_write_lcd(kmb, LCD_INT_CLEAR, LCD_INT_EOF);
213
214 /* When disabling/enabling LCD layers, the change takes effect
215 * immediately and does not wait for EOF (end of frame).
216 * When kmb_plane_atomic_disable is called, mark the plane as
217 * disabled but actually disable the plane when EOF irq is
218 * being handled.
219 */
220 for (plane_id = LAYER_0;
221 plane_id < KMB_MAX_PLANES; plane_id++) {
222 if (kmb->plane_status[plane_id].disable) {
223 kmb_clr_bitmask_lcd(kmb,
224 LCD_LAYERn_DMA_CFG
225 (plane_id),
226 LCD_DMA_LAYER_ENABLE);
227
228 kmb_clr_bitmask_lcd(kmb, LCD_CONTROL,
229 kmb->plane_status[plane_id].ctrl);
230
231 ctrl = kmb_read_lcd(kmb, LCD_CONTROL);
232 if (!(ctrl & (LCD_CTRL_VL1_ENABLE |
233 LCD_CTRL_VL2_ENABLE |
234 LCD_CTRL_GL1_ENABLE |
235 LCD_CTRL_GL2_ENABLE))) {
236 /* If no LCD layers are using DMA,
237 * then disable DMA pipelined AXI read
238 * transactions.
239 */
240 kmb_clr_bitmask_lcd(kmb, LCD_CONTROL,
241 LCD_CTRL_PIPELINE_DMA);
242 }
243
244 kmb->plane_status[plane_id].disable = false;
245 }
246 }
247 if (kmb->kmb_under_flow) {
248 /* DMA Recovery after underflow */
249 dma0_state = (kmb->layer_no == 0) ?
250 LCD_VIDEO0_DMA0_STATE : LCD_VIDEO1_DMA0_STATE;
251 dma1_state = (kmb->layer_no == 0) ?
252 LCD_VIDEO0_DMA1_STATE : LCD_VIDEO1_DMA1_STATE;
253
254 do {
255 kmb_write_lcd(kmb, LCD_FIFO_FLUSH, 1);
256 val = kmb_read_lcd(kmb, dma0_state)
257 & LCD_DMA_STATE_ACTIVE;
258 val1 = kmb_read_lcd(kmb, dma1_state)
259 & LCD_DMA_STATE_ACTIVE;
260 } while ((val || val1));
261 /* disable dma */
262 kmb_clr_bitmask_lcd(kmb,
263 LCD_LAYERn_DMA_CFG(kmb->layer_no),
264 LCD_DMA_LAYER_ENABLE);
265 kmb_write_lcd(kmb, LCD_FIFO_FLUSH, 1);
266 kmb->kmb_flush_done = 1;
267 kmb->kmb_under_flow = 0;
268 }
269 }
270
271 if (status & LCD_INT_LINE_CMP) {
272 /* clear line compare interrupt */
273 kmb_write_lcd(kmb, LCD_INT_CLEAR, LCD_INT_LINE_CMP);
274 }
275
276 if (status & LCD_INT_VERT_COMP) {
277 /* Read VSTATUS */
278 val = kmb_read_lcd(kmb, LCD_VSTATUS);
279 val = (val & LCD_VSTATUS_VERTICAL_STATUS_MASK);
280 switch (val) {
281 case LCD_VSTATUS_COMPARE_VSYNC:
282 /* Clear vertical compare interrupt */
283 kmb_write_lcd(kmb, LCD_INT_CLEAR, LCD_INT_VERT_COMP);
284 if (kmb->kmb_flush_done) {
285 kmb_set_bitmask_lcd(kmb,
286 LCD_LAYERn_DMA_CFG
287 (kmb->layer_no),
288 LCD_DMA_LAYER_ENABLE);
289 kmb->kmb_flush_done = 0;
290 }
291 drm_crtc_handle_vblank(&kmb->crtc);
292 break;
293 case LCD_VSTATUS_COMPARE_BACKPORCH:
294 case LCD_VSTATUS_COMPARE_ACTIVE:
295 case LCD_VSTATUS_COMPARE_FRONT_PORCH:
296 kmb_write_lcd(kmb, LCD_INT_CLEAR, LCD_INT_VERT_COMP);
297 break;
298 }
299 }
300 if (status & LCD_INT_DMA_ERR) {
301 val =
302 (status & LCD_INT_DMA_ERR &
303 kmb_read_lcd(kmb, LCD_INT_ENABLE));
304 /* LAYER0 - VL0 */
305 if (val & (LAYER0_DMA_FIFO_UNDERFLOW |
306 LAYER0_DMA_CB_FIFO_UNDERFLOW |
307 LAYER0_DMA_CR_FIFO_UNDERFLOW)) {
308 kmb->kmb_under_flow++;
309 drm_info(&kmb->drm,
310 "!LAYER0:VL0 DMA UNDERFLOW val = 0x%lx,under_flow=%d",
311 val, kmb->kmb_under_flow);
312 /* disable underflow interrupt */
313 kmb_clr_bitmask_lcd(kmb, LCD_INT_ENABLE,
314 LAYER0_DMA_FIFO_UNDERFLOW |
315 LAYER0_DMA_CB_FIFO_UNDERFLOW |
316 LAYER0_DMA_CR_FIFO_UNDERFLOW);
317 kmb_set_bitmask_lcd(kmb, LCD_INT_CLEAR,
318 LAYER0_DMA_CB_FIFO_UNDERFLOW |
319 LAYER0_DMA_FIFO_UNDERFLOW |
320 LAYER0_DMA_CR_FIFO_UNDERFLOW);
321 /* disable auto restart mode */
322 kmb_clr_bitmask_lcd(kmb, LCD_LAYERn_DMA_CFG(0),
323 LCD_DMA_LAYER_CONT_PING_PONG_UPDATE);
324
325 kmb->layer_no = 0;
326 }
327
328 if (val & LAYER0_DMA_FIFO_OVERFLOW)
329 drm_dbg(&kmb->drm,
330 "LAYER0:VL0 DMA OVERFLOW val = 0x%lx", val);
331 if (val & LAYER0_DMA_CB_FIFO_OVERFLOW)
332 drm_dbg(&kmb->drm,
333 "LAYER0:VL0 DMA CB OVERFLOW val = 0x%lx", val);
334 if (val & LAYER0_DMA_CR_FIFO_OVERFLOW)
335 drm_dbg(&kmb->drm,
336 "LAYER0:VL0 DMA CR OVERFLOW val = 0x%lx", val);
337
338 /* LAYER1 - VL1 */
339 if (val & (LAYER1_DMA_FIFO_UNDERFLOW |
340 LAYER1_DMA_CB_FIFO_UNDERFLOW |
341 LAYER1_DMA_CR_FIFO_UNDERFLOW)) {
342 kmb->kmb_under_flow++;
343 drm_info(&kmb->drm,
344 "!LAYER1:VL1 DMA UNDERFLOW val = 0x%lx, under_flow=%d",
345 val, kmb->kmb_under_flow);
346 /* disable underflow interrupt */
347 kmb_clr_bitmask_lcd(kmb, LCD_INT_ENABLE,
348 LAYER1_DMA_FIFO_UNDERFLOW |
349 LAYER1_DMA_CB_FIFO_UNDERFLOW |
350 LAYER1_DMA_CR_FIFO_UNDERFLOW);
351 kmb_set_bitmask_lcd(kmb, LCD_INT_CLEAR,
352 LAYER1_DMA_CB_FIFO_UNDERFLOW |
353 LAYER1_DMA_FIFO_UNDERFLOW |
354 LAYER1_DMA_CR_FIFO_UNDERFLOW);
355 /* disable auto restart mode */
356 kmb_clr_bitmask_lcd(kmb, LCD_LAYERn_DMA_CFG(1),
357 LCD_DMA_LAYER_CONT_PING_PONG_UPDATE);
358 kmb->layer_no = 1;
359 }
360
361 /* LAYER1 - VL1 */
362 if (val & LAYER1_DMA_FIFO_OVERFLOW)
363 drm_dbg(&kmb->drm,
364 "LAYER1:VL1 DMA OVERFLOW val = 0x%lx", val);
365 if (val & LAYER1_DMA_CB_FIFO_OVERFLOW)
366 drm_dbg(&kmb->drm,
367 "LAYER1:VL1 DMA CB OVERFLOW val = 0x%lx", val);
368 if (val & LAYER1_DMA_CR_FIFO_OVERFLOW)
369 drm_dbg(&kmb->drm,
370 "LAYER1:VL1 DMA CR OVERFLOW val = 0x%lx", val);
371
372 /* LAYER2 - GL0 */
373 if (val & LAYER2_DMA_FIFO_UNDERFLOW)
374 drm_dbg(&kmb->drm,
375 "LAYER2:GL0 DMA UNDERFLOW val = 0x%lx", val);
376 if (val & LAYER2_DMA_FIFO_OVERFLOW)
377 drm_dbg(&kmb->drm,
378 "LAYER2:GL0 DMA OVERFLOW val = 0x%lx", val);
379
380 /* LAYER3 - GL1 */
381 if (val & LAYER3_DMA_FIFO_UNDERFLOW)
382 drm_dbg(&kmb->drm,
383 "LAYER3:GL1 DMA UNDERFLOW val = 0x%lx", val);
384 if (val & LAYER3_DMA_FIFO_OVERFLOW)
385 drm_dbg(&kmb->drm,
386 "LAYER3:GL1 DMA OVERFLOW val = 0x%lx", val);
387 }
388
389 spin_unlock(&kmb->irq_lock);
390
391 if (status & LCD_INT_LAYER) {
392 /* Clear layer interrupts */
393 kmb_write_lcd(kmb, LCD_INT_CLEAR, LCD_INT_LAYER);
394 }
395
396 /* Clear all interrupts */
397 kmb_set_bitmask_lcd(kmb, LCD_INT_CLEAR, 1);
398 return IRQ_HANDLED;
399}
400
401/* IRQ handler */
402static irqreturn_t kmb_isr(int irq, void *arg)
403{
404 struct drm_device *dev = (struct drm_device *)arg;
405
406 handle_lcd_irq(dev);
407 return IRQ_HANDLED;
408}
409
410static void kmb_irq_reset(struct drm_device *drm)
411{
412 kmb_write_lcd(to_kmb(drm), LCD_INT_CLEAR, 0xFFFF);
413 kmb_write_lcd(to_kmb(drm), LCD_INT_ENABLE, 0);
414}
415
416DEFINE_DRM_GEM_CMA_FOPS(fops);
417
418static const struct drm_driver kmb_driver = {
419 .driver_features = DRIVER_GEM |
420 DRIVER_MODESET | DRIVER_ATOMIC,
421 .irq_handler = kmb_isr,
422 .irq_preinstall = kmb_irq_reset,
423 .irq_uninstall = kmb_irq_reset,
424 /* GEM Operations */
425 .fops = &fops,
426 DRM_GEM_CMA_DRIVER_OPS_VMAP,
427 .name = "kmb-drm",
428 .desc = "KEEMBAY DISPLAY DRIVER",
429 .date = DRIVER_DATE,
430 .major = DRIVER_MAJOR,
431 .minor = DRIVER_MINOR,
432};
433
434static int kmb_remove(struct platform_device *pdev)
435{
436 struct device *dev = &pdev->dev;
437 struct drm_device *drm = dev_get_drvdata(dev);
438 struct kmb_drm_private *kmb = to_kmb(drm);
439
440 drm_dev_unregister(drm);
441 drm_kms_helper_poll_fini(drm);
442 of_node_put(kmb->crtc.port);
443 kmb->crtc.port = NULL;
444 pm_runtime_get_sync(drm->dev);
445 drm_irq_uninstall(drm);
446 pm_runtime_put_sync(drm->dev);
447 pm_runtime_disable(drm->dev);
448
449 of_reserved_mem_device_release(drm->dev);
450
451 /* Release clks */
452 kmb_display_clk_disable(kmb);
453
454 dev_set_drvdata(dev, NULL);
455
456 /* Unregister DSI host */
457 kmb_dsi_host_unregister(kmb->kmb_dsi);
458 drm_atomic_helper_shutdown(drm);
459 return 0;
460}
461
462static int kmb_probe(struct platform_device *pdev)
463{
464 struct device *dev = get_device(&pdev->dev);
465 struct kmb_drm_private *kmb;
466 int ret = 0;
467 struct device_node *dsi_in;
468 struct device_node *dsi_node;
469 struct platform_device *dsi_pdev;
470
471 /* The bridge (ADV 7535) will return -EPROBE_DEFER until it
472 * has a mipi_dsi_host to register its device to. So, we
473 * first register the DSI host during probe time, and then return
474 * -EPROBE_DEFER until the bridge is loaded. Probe will be called again
475 * and then the rest of the driver initialization can proceed
476 * afterwards and the bridge can be successfully attached.
477 */
478 dsi_in = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
479 if (!dsi_in) {
480 DRM_ERROR("Failed to get dsi_in node info from DT");
481 return -EINVAL;
482 }
483 dsi_node = of_graph_get_remote_port_parent(dsi_in);
484 if (!dsi_node) {
485 of_node_put(dsi_in);
486 DRM_ERROR("Failed to get dsi node from DT\n");
487 return -EINVAL;
488 }
489
490 dsi_pdev = of_find_device_by_node(dsi_node);
491 if (!dsi_pdev) {
492 of_node_put(dsi_in);
493 of_node_put(dsi_node);
494 DRM_ERROR("Failed to get dsi platform device\n");
495 return -EINVAL;
496 }
497
498 of_node_put(dsi_in);
499 of_node_put(dsi_node);
500 ret = kmb_dsi_host_bridge_init(get_device(&dsi_pdev->dev));
501
502 if (ret == -EPROBE_DEFER) {
503 return -EPROBE_DEFER;
504 } else if (ret) {
505 DRM_ERROR("probe failed to initialize DSI host bridge\n");
506 return ret;
507 }
508
509 /* Create DRM device */
510 kmb = devm_drm_dev_alloc(dev, &kmb_driver,
511 struct kmb_drm_private, drm);
512 if (IS_ERR(kmb))
513 return PTR_ERR(kmb);
514
515 dev_set_drvdata(dev, &kmb->drm);
516
517 /* Initialize MIPI DSI */
518 kmb->kmb_dsi = kmb_dsi_init(dsi_pdev);
519 if (IS_ERR(kmb->kmb_dsi)) {
520 drm_err(&kmb->drm, "failed to initialize DSI\n");
521 ret = PTR_ERR(kmb->kmb_dsi);
522 goto err_free1;
523 }
524
525 kmb->kmb_dsi->dev = &dsi_pdev->dev;
526 kmb->kmb_dsi->pdev = dsi_pdev;
527 ret = kmb_hw_init(&kmb->drm, 0);
528 if (ret)
529 goto err_free1;
530
531 ret = kmb_setup_mode_config(&kmb->drm);
532 if (ret)
533 goto err_free;
534
535 ret = drm_irq_install(&kmb->drm, kmb->irq_lcd);
536 if (ret < 0) {
537 drm_err(&kmb->drm, "failed to install IRQ handler\n");
538 goto err_irq;
539 }
540
541 drm_kms_helper_poll_init(&kmb->drm);
542
543 /* Register graphics device with the kernel */
544 ret = drm_dev_register(&kmb->drm, 0);
545 if (ret)
546 goto err_register;
547
548 return 0;
549
550 err_register:
551 drm_kms_helper_poll_fini(&kmb->drm);
552 err_irq:
553 pm_runtime_disable(kmb->drm.dev);
554 err_free:
555 drm_crtc_cleanup(&kmb->crtc);
556 drm_mode_config_cleanup(&kmb->drm);
557 err_free1:
558 dev_set_drvdata(dev, NULL);
559 kmb_dsi_host_unregister(kmb->kmb_dsi);
560
561 return ret;
562}
563
564static const struct of_device_id kmb_of_match[] = {
565 {.compatible = "intel,keembay-display"},
566 {},
567};
568
569MODULE_DEVICE_TABLE(of, kmb_of_match);
570
571static int __maybe_unused kmb_pm_suspend(struct device *dev)
572{
573 struct drm_device *drm = dev_get_drvdata(dev);
574 struct kmb_drm_private *kmb = to_kmb(drm);
575
576 drm_kms_helper_poll_disable(drm);
577
578 kmb->state = drm_atomic_helper_suspend(drm);
579 if (IS_ERR(kmb->state)) {
580 drm_kms_helper_poll_enable(drm);
581 return PTR_ERR(kmb->state);
582 }
583
584 return 0;
585}
586
587static int __maybe_unused kmb_pm_resume(struct device *dev)
588{
589 struct drm_device *drm = dev_get_drvdata(dev);
590 struct kmb_drm_private *kmb = drm ? to_kmb(drm) : NULL;
591
592 if (!kmb)
593 return 0;
594
595 drm_atomic_helper_resume(drm, kmb->state);
596 drm_kms_helper_poll_enable(drm);
597
598 return 0;
599}
600
601static SIMPLE_DEV_PM_OPS(kmb_pm_ops, kmb_pm_suspend, kmb_pm_resume);
602
603static struct platform_driver kmb_platform_driver = {
604 .probe = kmb_probe,
605 .remove = kmb_remove,
606 .driver = {
607 .name = "kmb-drm",
608 .pm = &kmb_pm_ops,
609 .of_match_table = kmb_of_match,
610 },
611};
612
613module_platform_driver(kmb_platform_driver);
614
615MODULE_AUTHOR("Intel Corporation");
616MODULE_DESCRIPTION("Keembay Display driver");
617MODULE_LICENSE("GPL v2");