Merge tag 'powerpc-5.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[linux-2.6-microblaze.git] / drivers / gpu / drm / mediatek / mtk_drm_ddp_comp.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2015 MediaTek Inc.
4  * Authors:
5  *      YT Shen <yt.shen@mediatek.com>
6  *      CK Hu <ck.hu@mediatek.com>
7  */
8
9 #include <linux/clk.h>
10 #include <linux/of.h>
11 #include <linux/of_address.h>
12 #include <linux/of_irq.h>
13 #include <linux/of_platform.h>
14 #include <linux/platform_device.h>
15 #include <linux/soc/mediatek/mtk-cmdq.h>
16 #include "mtk_drm_drv.h"
17 #include "mtk_drm_plane.h"
18 #include "mtk_drm_ddp_comp.h"
19 #include "mtk_drm_crtc.h"
20
21 #define DISP_OD_EN                              0x0000
22 #define DISP_OD_INTEN                           0x0008
23 #define DISP_OD_INTSTA                          0x000c
24 #define DISP_OD_CFG                             0x0020
25 #define DISP_OD_SIZE                            0x0030
26 #define DISP_DITHER_5                           0x0114
27 #define DISP_DITHER_7                           0x011c
28 #define DISP_DITHER_15                          0x013c
29 #define DISP_DITHER_16                          0x0140
30
31 #define DISP_REG_UFO_START                      0x0000
32
33 #define DISP_AAL_EN                             0x0000
34 #define DISP_AAL_SIZE                           0x0030
35
36 #define DISP_CCORR_EN                           0x0000
37 #define CCORR_EN                                BIT(0)
38 #define DISP_CCORR_CFG                          0x0020
39 #define CCORR_RELAY_MODE                        BIT(0)
40 #define CCORR_ENGINE_EN                         BIT(1)
41 #define CCORR_GAMMA_OFF                         BIT(2)
42 #define CCORR_WGAMUT_SRC_CLIP                   BIT(3)
43 #define DISP_CCORR_SIZE                         0x0030
44 #define DISP_CCORR_COEF_0                       0x0080
45 #define DISP_CCORR_COEF_1                       0x0084
46 #define DISP_CCORR_COEF_2                       0x0088
47 #define DISP_CCORR_COEF_3                       0x008C
48 #define DISP_CCORR_COEF_4                       0x0090
49
50 #define DISP_DITHER_EN                          0x0000
51 #define DITHER_EN                               BIT(0)
52 #define DISP_DITHER_CFG                         0x0020
53 #define DITHER_RELAY_MODE                       BIT(0)
54 #define DISP_DITHER_SIZE                        0x0030
55
56 #define DISP_GAMMA_EN                           0x0000
57 #define DISP_GAMMA_CFG                          0x0020
58 #define DISP_GAMMA_SIZE                         0x0030
59 #define DISP_GAMMA_LUT                          0x0700
60
61 #define LUT_10BIT_MASK                          0x03ff
62
63 #define OD_RELAYMODE                            BIT(0)
64
65 #define UFO_BYPASS                              BIT(2)
66
67 #define AAL_EN                                  BIT(0)
68
69 #define GAMMA_EN                                BIT(0)
70 #define GAMMA_LUT_EN                            BIT(1)
71
72 #define DISP_DITHERING                          BIT(2)
73 #define DITHER_LSB_ERR_SHIFT_R(x)               (((x) & 0x7) << 28)
74 #define DITHER_OVFLW_BIT_R(x)                   (((x) & 0x7) << 24)
75 #define DITHER_ADD_LSHIFT_R(x)                  (((x) & 0x7) << 20)
76 #define DITHER_ADD_RSHIFT_R(x)                  (((x) & 0x7) << 16)
77 #define DITHER_NEW_BIT_MODE                     BIT(0)
78 #define DITHER_LSB_ERR_SHIFT_B(x)               (((x) & 0x7) << 28)
79 #define DITHER_OVFLW_BIT_B(x)                   (((x) & 0x7) << 24)
80 #define DITHER_ADD_LSHIFT_B(x)                  (((x) & 0x7) << 20)
81 #define DITHER_ADD_RSHIFT_B(x)                  (((x) & 0x7) << 16)
82 #define DITHER_LSB_ERR_SHIFT_G(x)               (((x) & 0x7) << 12)
83 #define DITHER_OVFLW_BIT_G(x)                   (((x) & 0x7) << 8)
84 #define DITHER_ADD_LSHIFT_G(x)                  (((x) & 0x7) << 4)
85 #define DITHER_ADD_RSHIFT_G(x)                  (((x) & 0x7) << 0)
86
87 void mtk_ddp_write(struct cmdq_pkt *cmdq_pkt, unsigned int value,
88                    struct mtk_ddp_comp *comp, unsigned int offset)
89 {
90 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
91         if (cmdq_pkt)
92                 cmdq_pkt_write(cmdq_pkt, comp->subsys,
93                                comp->regs_pa + offset, value);
94         else
95 #endif
96                 writel(value, comp->regs + offset);
97 }
98
99 void mtk_ddp_write_relaxed(struct cmdq_pkt *cmdq_pkt, unsigned int value,
100                            struct mtk_ddp_comp *comp,
101                            unsigned int offset)
102 {
103 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
104         if (cmdq_pkt)
105                 cmdq_pkt_write(cmdq_pkt, comp->subsys,
106                                comp->regs_pa + offset, value);
107         else
108 #endif
109                 writel_relaxed(value, comp->regs + offset);
110 }
111
112 void mtk_ddp_write_mask(struct cmdq_pkt *cmdq_pkt,
113                         unsigned int value,
114                         struct mtk_ddp_comp *comp,
115                         unsigned int offset,
116                         unsigned int mask)
117 {
118 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
119         if (cmdq_pkt) {
120                 cmdq_pkt_write_mask(cmdq_pkt, comp->subsys,
121                                     comp->regs_pa + offset, value, mask);
122         } else {
123 #endif
124                 u32 tmp = readl(comp->regs + offset);
125
126                 tmp = (tmp & ~mask) | (value & mask);
127                 writel(tmp, comp->regs + offset);
128 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
129         }
130 #endif
131 }
132
133 void mtk_dither_set(struct mtk_ddp_comp *comp, unsigned int bpc,
134                     unsigned int CFG, struct cmdq_pkt *cmdq_pkt)
135 {
136         /* If bpc equal to 0, the dithering function didn't be enabled */
137         if (bpc == 0)
138                 return;
139
140         if (bpc >= MTK_MIN_BPC) {
141                 mtk_ddp_write(cmdq_pkt, 0, comp, DISP_DITHER_5);
142                 mtk_ddp_write(cmdq_pkt, 0, comp, DISP_DITHER_7);
143                 mtk_ddp_write(cmdq_pkt,
144                               DITHER_LSB_ERR_SHIFT_R(MTK_MAX_BPC - bpc) |
145                               DITHER_ADD_LSHIFT_R(MTK_MAX_BPC - bpc) |
146                               DITHER_NEW_BIT_MODE,
147                               comp, DISP_DITHER_15);
148                 mtk_ddp_write(cmdq_pkt,
149                               DITHER_LSB_ERR_SHIFT_B(MTK_MAX_BPC - bpc) |
150                               DITHER_ADD_LSHIFT_B(MTK_MAX_BPC - bpc) |
151                               DITHER_LSB_ERR_SHIFT_G(MTK_MAX_BPC - bpc) |
152                               DITHER_ADD_LSHIFT_G(MTK_MAX_BPC - bpc),
153                               comp, DISP_DITHER_16);
154                 mtk_ddp_write(cmdq_pkt, DISP_DITHERING, comp, CFG);
155         }
156 }
157
158 static void mtk_od_config(struct mtk_ddp_comp *comp, unsigned int w,
159                           unsigned int h, unsigned int vrefresh,
160                           unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
161 {
162         mtk_ddp_write(cmdq_pkt, w << 16 | h, comp, DISP_OD_SIZE);
163         mtk_ddp_write(cmdq_pkt, OD_RELAYMODE, comp, DISP_OD_CFG);
164         mtk_dither_set(comp, bpc, DISP_OD_CFG, cmdq_pkt);
165 }
166
167 static void mtk_od_start(struct mtk_ddp_comp *comp)
168 {
169         writel(1, comp->regs + DISP_OD_EN);
170 }
171
172 static void mtk_ufoe_start(struct mtk_ddp_comp *comp)
173 {
174         writel(UFO_BYPASS, comp->regs + DISP_REG_UFO_START);
175 }
176
177 static void mtk_aal_config(struct mtk_ddp_comp *comp, unsigned int w,
178                            unsigned int h, unsigned int vrefresh,
179                            unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
180 {
181         mtk_ddp_write(cmdq_pkt, h << 16 | w, comp, DISP_AAL_SIZE);
182 }
183
184 static void mtk_aal_start(struct mtk_ddp_comp *comp)
185 {
186         writel(AAL_EN, comp->regs + DISP_AAL_EN);
187 }
188
189 static void mtk_aal_stop(struct mtk_ddp_comp *comp)
190 {
191         writel_relaxed(0x0, comp->regs + DISP_AAL_EN);
192 }
193
194 static void mtk_ccorr_config(struct mtk_ddp_comp *comp, unsigned int w,
195                              unsigned int h, unsigned int vrefresh,
196                              unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
197 {
198         mtk_ddp_write(cmdq_pkt, h << 16 | w, comp, DISP_CCORR_SIZE);
199         mtk_ddp_write(cmdq_pkt, CCORR_ENGINE_EN, comp, DISP_CCORR_CFG);
200 }
201
202 static void mtk_ccorr_start(struct mtk_ddp_comp *comp)
203 {
204         writel(CCORR_EN, comp->regs + DISP_CCORR_EN);
205 }
206
207 static void mtk_ccorr_stop(struct mtk_ddp_comp *comp)
208 {
209         writel_relaxed(0x0, comp->regs + DISP_CCORR_EN);
210 }
211
212 /* Converts a DRM S31.32 value to the HW S1.10 format. */
213 static u16 mtk_ctm_s31_32_to_s1_10(u64 in)
214 {
215         u16 r;
216
217         /* Sign bit. */
218         r = in & BIT_ULL(63) ? BIT(11) : 0;
219
220         if ((in & GENMASK_ULL(62, 33)) > 0) {
221                 /* identity value 0x100000000 -> 0x400, */
222                 /* if bigger this, set it to max 0x7ff. */
223                 r |= GENMASK(10, 0);
224         } else {
225                 /* take the 11 most important bits. */
226                 r |= (in >> 22) & GENMASK(10, 0);
227         }
228
229         return r;
230 }
231
232 static void mtk_ccorr_ctm_set(struct mtk_ddp_comp *comp,
233                               struct drm_crtc_state *state)
234 {
235         struct drm_property_blob *blob = state->ctm;
236         struct drm_color_ctm *ctm;
237         const u64 *input;
238         uint16_t coeffs[9] = { 0 };
239         int i;
240         struct cmdq_pkt *cmdq_pkt = NULL;
241
242         if (!blob)
243                 return;
244
245         ctm = (struct drm_color_ctm *)blob->data;
246         input = ctm->matrix;
247
248         for (i = 0; i < ARRAY_SIZE(coeffs); i++)
249                 coeffs[i] = mtk_ctm_s31_32_to_s1_10(input[i]);
250
251         mtk_ddp_write(cmdq_pkt, coeffs[0] << 16 | coeffs[1],
252                       comp, DISP_CCORR_COEF_0);
253         mtk_ddp_write(cmdq_pkt, coeffs[2] << 16 | coeffs[3],
254                       comp, DISP_CCORR_COEF_1);
255         mtk_ddp_write(cmdq_pkt, coeffs[4] << 16 | coeffs[5],
256                       comp, DISP_CCORR_COEF_2);
257         mtk_ddp_write(cmdq_pkt, coeffs[6] << 16 | coeffs[7],
258                       comp, DISP_CCORR_COEF_3);
259         mtk_ddp_write(cmdq_pkt, coeffs[8] << 16,
260                       comp, DISP_CCORR_COEF_4);
261 }
262
263 static void mtk_dither_config(struct mtk_ddp_comp *comp, unsigned int w,
264                               unsigned int h, unsigned int vrefresh,
265                               unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
266 {
267         mtk_ddp_write(cmdq_pkt, h << 16 | w, comp, DISP_DITHER_SIZE);
268         mtk_ddp_write(cmdq_pkt, DITHER_RELAY_MODE, comp, DISP_DITHER_CFG);
269 }
270
271 static void mtk_dither_start(struct mtk_ddp_comp *comp)
272 {
273         writel(DITHER_EN, comp->regs + DISP_DITHER_EN);
274 }
275
276 static void mtk_dither_stop(struct mtk_ddp_comp *comp)
277 {
278         writel_relaxed(0x0, comp->regs + DISP_DITHER_EN);
279 }
280
281 static void mtk_gamma_config(struct mtk_ddp_comp *comp, unsigned int w,
282                              unsigned int h, unsigned int vrefresh,
283                              unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
284 {
285         mtk_ddp_write(cmdq_pkt, h << 16 | w, comp, DISP_GAMMA_SIZE);
286         mtk_dither_set(comp, bpc, DISP_GAMMA_CFG, cmdq_pkt);
287 }
288
289 static void mtk_gamma_start(struct mtk_ddp_comp *comp)
290 {
291         writel(GAMMA_EN, comp->regs  + DISP_GAMMA_EN);
292 }
293
294 static void mtk_gamma_stop(struct mtk_ddp_comp *comp)
295 {
296         writel_relaxed(0x0, comp->regs  + DISP_GAMMA_EN);
297 }
298
299 static void mtk_gamma_set(struct mtk_ddp_comp *comp,
300                           struct drm_crtc_state *state)
301 {
302         unsigned int i, reg;
303         struct drm_color_lut *lut;
304         void __iomem *lut_base;
305         u32 word;
306
307         if (state->gamma_lut) {
308                 reg = readl(comp->regs + DISP_GAMMA_CFG);
309                 reg = reg | GAMMA_LUT_EN;
310                 writel(reg, comp->regs + DISP_GAMMA_CFG);
311                 lut_base = comp->regs + DISP_GAMMA_LUT;
312                 lut = (struct drm_color_lut *)state->gamma_lut->data;
313                 for (i = 0; i < MTK_LUT_SIZE; i++) {
314                         word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) +
315                                 (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) +
316                                 ((lut[i].blue >> 6) & LUT_10BIT_MASK);
317                         writel(word, (lut_base + i * 4));
318                 }
319         }
320 }
321
322 static const struct mtk_ddp_comp_funcs ddp_aal = {
323         .gamma_set = mtk_gamma_set,
324         .config = mtk_aal_config,
325         .start = mtk_aal_start,
326         .stop = mtk_aal_stop,
327 };
328
329 static const struct mtk_ddp_comp_funcs ddp_ccorr = {
330         .config = mtk_ccorr_config,
331         .start = mtk_ccorr_start,
332         .stop = mtk_ccorr_stop,
333         .ctm_set = mtk_ccorr_ctm_set,
334 };
335
336 static const struct mtk_ddp_comp_funcs ddp_dither = {
337         .config = mtk_dither_config,
338         .start = mtk_dither_start,
339         .stop = mtk_dither_stop,
340 };
341
342 static const struct mtk_ddp_comp_funcs ddp_gamma = {
343         .gamma_set = mtk_gamma_set,
344         .config = mtk_gamma_config,
345         .start = mtk_gamma_start,
346         .stop = mtk_gamma_stop,
347 };
348
349 static const struct mtk_ddp_comp_funcs ddp_od = {
350         .config = mtk_od_config,
351         .start = mtk_od_start,
352 };
353
354 static const struct mtk_ddp_comp_funcs ddp_ufoe = {
355         .start = mtk_ufoe_start,
356 };
357
358 static const char * const mtk_ddp_comp_stem[MTK_DDP_COMP_TYPE_MAX] = {
359         [MTK_DISP_OVL] = "ovl",
360         [MTK_DISP_OVL_2L] = "ovl_2l",
361         [MTK_DISP_RDMA] = "rdma",
362         [MTK_DISP_WDMA] = "wdma",
363         [MTK_DISP_COLOR] = "color",
364         [MTK_DISP_CCORR] = "ccorr",
365         [MTK_DISP_AAL] = "aal",
366         [MTK_DISP_GAMMA] = "gamma",
367         [MTK_DISP_DITHER] = "dither",
368         [MTK_DISP_UFOE] = "ufoe",
369         [MTK_DSI] = "dsi",
370         [MTK_DPI] = "dpi",
371         [MTK_DISP_PWM] = "pwm",
372         [MTK_DISP_MUTEX] = "mutex",
373         [MTK_DISP_OD] = "od",
374         [MTK_DISP_BLS] = "bls",
375 };
376
377 struct mtk_ddp_comp_match {
378         enum mtk_ddp_comp_type type;
379         int alias_id;
380         const struct mtk_ddp_comp_funcs *funcs;
381 };
382
383 static const struct mtk_ddp_comp_match mtk_ddp_matches[DDP_COMPONENT_ID_MAX] = {
384         [DDP_COMPONENT_AAL0]    = { MTK_DISP_AAL,       0, &ddp_aal },
385         [DDP_COMPONENT_AAL1]    = { MTK_DISP_AAL,       1, &ddp_aal },
386         [DDP_COMPONENT_BLS]     = { MTK_DISP_BLS,       0, NULL },
387         [DDP_COMPONENT_CCORR]   = { MTK_DISP_CCORR,     0, &ddp_ccorr },
388         [DDP_COMPONENT_COLOR0]  = { MTK_DISP_COLOR,     0, NULL },
389         [DDP_COMPONENT_COLOR1]  = { MTK_DISP_COLOR,     1, NULL },
390         [DDP_COMPONENT_DITHER]  = { MTK_DISP_DITHER,    0, &ddp_dither },
391         [DDP_COMPONENT_DPI0]    = { MTK_DPI,            0, NULL },
392         [DDP_COMPONENT_DPI1]    = { MTK_DPI,            1, NULL },
393         [DDP_COMPONENT_DSI0]    = { MTK_DSI,            0, NULL },
394         [DDP_COMPONENT_DSI1]    = { MTK_DSI,            1, NULL },
395         [DDP_COMPONENT_DSI2]    = { MTK_DSI,            2, NULL },
396         [DDP_COMPONENT_DSI3]    = { MTK_DSI,            3, NULL },
397         [DDP_COMPONENT_GAMMA]   = { MTK_DISP_GAMMA,     0, &ddp_gamma },
398         [DDP_COMPONENT_OD0]     = { MTK_DISP_OD,        0, &ddp_od },
399         [DDP_COMPONENT_OD1]     = { MTK_DISP_OD,        1, &ddp_od },
400         [DDP_COMPONENT_OVL0]    = { MTK_DISP_OVL,       0, NULL },
401         [DDP_COMPONENT_OVL1]    = { MTK_DISP_OVL,       1, NULL },
402         [DDP_COMPONENT_OVL_2L0] = { MTK_DISP_OVL_2L,    0, NULL },
403         [DDP_COMPONENT_OVL_2L1] = { MTK_DISP_OVL_2L,    1, NULL },
404         [DDP_COMPONENT_PWM0]    = { MTK_DISP_PWM,       0, NULL },
405         [DDP_COMPONENT_PWM1]    = { MTK_DISP_PWM,       1, NULL },
406         [DDP_COMPONENT_PWM2]    = { MTK_DISP_PWM,       2, NULL },
407         [DDP_COMPONENT_RDMA0]   = { MTK_DISP_RDMA,      0, NULL },
408         [DDP_COMPONENT_RDMA1]   = { MTK_DISP_RDMA,      1, NULL },
409         [DDP_COMPONENT_RDMA2]   = { MTK_DISP_RDMA,      2, NULL },
410         [DDP_COMPONENT_UFOE]    = { MTK_DISP_UFOE,      0, &ddp_ufoe },
411         [DDP_COMPONENT_WDMA0]   = { MTK_DISP_WDMA,      0, NULL },
412         [DDP_COMPONENT_WDMA1]   = { MTK_DISP_WDMA,      1, NULL },
413 };
414
415 int mtk_ddp_comp_get_id(struct device_node *node,
416                         enum mtk_ddp_comp_type comp_type)
417 {
418         int id = of_alias_get_id(node, mtk_ddp_comp_stem[comp_type]);
419         int i;
420
421         for (i = 0; i < ARRAY_SIZE(mtk_ddp_matches); i++) {
422                 if (comp_type == mtk_ddp_matches[i].type &&
423                     (id < 0 || id == mtk_ddp_matches[i].alias_id))
424                         return i;
425         }
426
427         return -EINVAL;
428 }
429
430 int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
431                       struct mtk_ddp_comp *comp, enum mtk_ddp_comp_id comp_id,
432                       const struct mtk_ddp_comp_funcs *funcs)
433 {
434         enum mtk_ddp_comp_type type;
435         struct device_node *larb_node;
436         struct platform_device *larb_pdev;
437 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
438         struct resource res;
439         struct cmdq_client_reg cmdq_reg;
440         int ret;
441 #endif
442
443         if (comp_id < 0 || comp_id >= DDP_COMPONENT_ID_MAX)
444                 return -EINVAL;
445
446         type = mtk_ddp_matches[comp_id].type;
447
448         comp->id = comp_id;
449         comp->funcs = funcs ?: mtk_ddp_matches[comp_id].funcs;
450
451         if (comp_id == DDP_COMPONENT_BLS ||
452             comp_id == DDP_COMPONENT_DPI0 ||
453             comp_id == DDP_COMPONENT_DPI1 ||
454             comp_id == DDP_COMPONENT_DSI0 ||
455             comp_id == DDP_COMPONENT_DSI1 ||
456             comp_id == DDP_COMPONENT_DSI2 ||
457             comp_id == DDP_COMPONENT_DSI3 ||
458             comp_id == DDP_COMPONENT_PWM0) {
459                 comp->regs = NULL;
460                 comp->clk = NULL;
461                 comp->irq = 0;
462                 return 0;
463         }
464
465         comp->regs = of_iomap(node, 0);
466         comp->irq = of_irq_get(node, 0);
467         comp->clk = of_clk_get(node, 0);
468         if (IS_ERR(comp->clk))
469                 return PTR_ERR(comp->clk);
470
471         /* Only DMA capable components need the LARB property */
472         comp->larb_dev = NULL;
473         if (type != MTK_DISP_OVL &&
474             type != MTK_DISP_OVL_2L &&
475             type != MTK_DISP_RDMA &&
476             type != MTK_DISP_WDMA)
477                 return 0;
478
479         larb_node = of_parse_phandle(node, "mediatek,larb", 0);
480         if (!larb_node) {
481                 dev_err(dev,
482                         "Missing mediadek,larb phandle in %pOF node\n", node);
483                 return -EINVAL;
484         }
485
486         larb_pdev = of_find_device_by_node(larb_node);
487         if (!larb_pdev) {
488                 dev_warn(dev, "Waiting for larb device %pOF\n", larb_node);
489                 of_node_put(larb_node);
490                 return -EPROBE_DEFER;
491         }
492         of_node_put(larb_node);
493
494         comp->larb_dev = &larb_pdev->dev;
495
496 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
497         if (of_address_to_resource(node, 0, &res) != 0) {
498                 dev_err(dev, "Missing reg in %s node\n", node->full_name);
499                 return -EINVAL;
500         }
501         comp->regs_pa = res.start;
502
503         ret = cmdq_dev_get_client_reg(dev, &cmdq_reg, 0);
504         if (ret)
505                 dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
506         else
507                 comp->subsys = cmdq_reg.subsys;
508 #endif
509         return 0;
510 }
511
512 int mtk_ddp_comp_register(struct drm_device *drm, struct mtk_ddp_comp *comp)
513 {
514         struct mtk_drm_private *private = drm->dev_private;
515
516         if (private->ddp_comp[comp->id])
517                 return -EBUSY;
518
519         private->ddp_comp[comp->id] = comp;
520         return 0;
521 }
522
523 void mtk_ddp_comp_unregister(struct drm_device *drm, struct mtk_ddp_comp *comp)
524 {
525         struct mtk_drm_private *private = drm->dev_private;
526
527         private->ddp_comp[comp->id] = NULL;
528 }