2 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/kernel.h>
15 #include <linux/bitops.h>
16 #include <linux/err.h>
17 #include <linux/bug.h>
18 #include <linux/export.h>
19 #include <linux/clk-provider.h>
20 #include <linux/delay.h>
21 #include <linux/regmap.h>
22 #include <linux/math64.h>
24 #include <asm/div64.h>
30 #define CMD_UPDATE BIT(0)
31 #define CMD_ROOT_EN BIT(1)
32 #define CMD_DIRTY_CFG BIT(4)
33 #define CMD_DIRTY_N BIT(5)
34 #define CMD_DIRTY_M BIT(6)
35 #define CMD_DIRTY_D BIT(7)
36 #define CMD_ROOT_OFF BIT(31)
39 #define CFG_SRC_DIV_SHIFT 0
40 #define CFG_SRC_SEL_SHIFT 8
41 #define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT)
42 #define CFG_MODE_SHIFT 12
43 #define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT)
44 #define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT)
50 static int clk_rcg2_is_enabled(struct clk_hw *hw)
52 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
56 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
60 return (cmd & CMD_ROOT_OFF) == 0;
63 static u8 clk_rcg2_get_parent(struct clk_hw *hw)
65 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
66 int num_parents = clk_hw_get_num_parents(hw);
70 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
74 cfg &= CFG_SRC_SEL_MASK;
75 cfg >>= CFG_SRC_SEL_SHIFT;
77 for (i = 0; i < num_parents; i++)
78 if (cfg == rcg->parent_map[i].cfg)
82 pr_debug("%s: Clock %s has invalid parent, using default.\n",
83 __func__, clk_hw_get_name(hw));
87 static int update_config(struct clk_rcg2 *rcg)
91 struct clk_hw *hw = &rcg->clkr.hw;
92 const char *name = clk_hw_get_name(hw);
94 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
95 CMD_UPDATE, CMD_UPDATE);
99 /* Wait for update to take effect */
100 for (count = 500; count > 0; count--) {
101 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
104 if (!(cmd & CMD_UPDATE))
109 WARN(1, "%s: rcg didn't update its configuration.", name);
113 static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
115 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
117 u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
119 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
120 CFG_SRC_SEL_MASK, cfg);
124 return update_config(rcg);
128 * Calculate m/n:d rate
131 * rate = ----------- x ---
135 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
153 clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
155 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
156 u32 cfg, hid_div, m = 0, n = 0, mode = 0, mask;
158 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
160 if (rcg->mnd_width) {
161 mask = BIT(rcg->mnd_width) - 1;
162 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m);
164 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &n);
168 mode = cfg & CFG_MODE_MASK;
169 mode >>= CFG_MODE_SHIFT;
172 mask = BIT(rcg->hid_width) - 1;
173 hid_div = cfg >> CFG_SRC_DIV_SHIFT;
176 return calc_rate(parent_rate, m, n, mode, hid_div);
179 static int _freq_tbl_determine_rate(struct clk_hw *hw,
180 const struct freq_tbl *f, struct clk_rate_request *req)
182 unsigned long clk_flags, rate = req->rate;
184 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
187 f = qcom_find_freq(f, rate);
191 index = qcom_find_src_index(hw, rcg->parent_map, f->src);
195 clk_flags = clk_hw_get_flags(hw);
196 p = clk_hw_get_parent_by_index(hw, index);
197 if (clk_flags & CLK_SET_RATE_PARENT) {
200 rate *= f->pre_div + 1;
210 rate = clk_hw_get_rate(p);
212 req->best_parent_hw = p;
213 req->best_parent_rate = rate;
219 static int clk_rcg2_determine_rate(struct clk_hw *hw,
220 struct clk_rate_request *req)
222 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
224 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req);
227 static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
230 struct clk_hw *hw = &rcg->clkr.hw;
231 int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
236 if (rcg->mnd_width && f->n) {
237 mask = BIT(rcg->mnd_width) - 1;
238 ret = regmap_update_bits(rcg->clkr.regmap,
239 rcg->cmd_rcgr + M_REG, mask, f->m);
243 ret = regmap_update_bits(rcg->clkr.regmap,
244 rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m));
248 ret = regmap_update_bits(rcg->clkr.regmap,
249 rcg->cmd_rcgr + D_REG, mask, ~f->n);
254 mask = BIT(rcg->hid_width) - 1;
255 mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK;
256 cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
257 cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
258 if (rcg->mnd_width && f->n && (f->m != f->n))
259 cfg |= CFG_MODE_DUAL_EDGE;
260 ret = regmap_update_bits(rcg->clkr.regmap,
261 rcg->cmd_rcgr + CFG_REG, mask, cfg);
265 return update_config(rcg);
268 static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate)
270 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
271 const struct freq_tbl *f;
273 f = qcom_find_freq(rcg->freq_tbl, rate);
277 return clk_rcg2_configure(rcg, f);
280 static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
281 unsigned long parent_rate)
283 return __clk_rcg2_set_rate(hw, rate);
286 static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
287 unsigned long rate, unsigned long parent_rate, u8 index)
289 return __clk_rcg2_set_rate(hw, rate);
292 const struct clk_ops clk_rcg2_ops = {
293 .is_enabled = clk_rcg2_is_enabled,
294 .get_parent = clk_rcg2_get_parent,
295 .set_parent = clk_rcg2_set_parent,
296 .recalc_rate = clk_rcg2_recalc_rate,
297 .determine_rate = clk_rcg2_determine_rate,
298 .set_rate = clk_rcg2_set_rate,
299 .set_rate_and_parent = clk_rcg2_set_rate_and_parent,
301 EXPORT_SYMBOL_GPL(clk_rcg2_ops);
303 static int clk_rcg2_shared_force_enable(struct clk_hw *hw, unsigned long rate)
305 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
306 const char *name = clk_hw_get_name(hw);
309 /* force enable RCG */
310 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
311 CMD_ROOT_EN, CMD_ROOT_EN);
315 /* wait for RCG to turn ON */
316 for (count = 500; count > 0; count--) {
317 ret = clk_rcg2_is_enabled(hw);
323 pr_err("%s: RCG did not turn on\n", name);
326 ret = __clk_rcg2_set_rate(hw, rate);
330 /* clear force enable RCG */
331 return regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
335 static int clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
336 unsigned long parent_rate)
338 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
341 rcg->current_freq = rate;
343 if (!__clk_is_enabled(hw->clk))
346 return clk_rcg2_shared_force_enable(hw, rcg->current_freq);
350 clk_rcg2_shared_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
352 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
354 return rcg->current_freq = clk_rcg2_recalc_rate(hw, parent_rate);
357 static int clk_rcg2_shared_enable(struct clk_hw *hw)
359 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
361 return clk_rcg2_shared_force_enable(hw, rcg->current_freq);
364 static void clk_rcg2_shared_disable(struct clk_hw *hw)
366 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
368 /* switch to XO, which is the lowest entry in the freq table */
369 clk_rcg2_shared_set_rate(hw, rcg->freq_tbl[0].freq, 0);
372 const struct clk_ops clk_rcg2_shared_ops = {
373 .enable = clk_rcg2_shared_enable,
374 .disable = clk_rcg2_shared_disable,
375 .get_parent = clk_rcg2_get_parent,
376 .recalc_rate = clk_rcg2_shared_recalc_rate,
377 .determine_rate = clk_rcg2_determine_rate,
378 .set_rate = clk_rcg2_shared_set_rate,
380 EXPORT_SYMBOL_GPL(clk_rcg2_shared_ops);
387 static const struct frac_entry frac_table_675m[] = { /* link rate of 270M */
388 { 52, 295 }, /* 119 M */
389 { 11, 57 }, /* 130.25 M */
390 { 63, 307 }, /* 138.50 M */
391 { 11, 50 }, /* 148.50 M */
392 { 47, 206 }, /* 154 M */
393 { 31, 100 }, /* 205.25 M */
394 { 107, 269 }, /* 268.50 M */
398 static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */
399 { 31, 211 }, /* 119 M */
400 { 32, 199 }, /* 130.25 M */
401 { 63, 307 }, /* 138.50 M */
402 { 11, 60 }, /* 148.50 M */
403 { 50, 263 }, /* 154 M */
404 { 31, 120 }, /* 205.25 M */
405 { 119, 359 }, /* 268.50 M */
409 static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
410 unsigned long parent_rate)
412 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
413 struct freq_tbl f = *rcg->freq_tbl;
414 const struct frac_entry *frac;
416 s64 src_rate = parent_rate;
418 u32 mask = BIT(rcg->hid_width) - 1;
421 if (src_rate == 810000000)
422 frac = frac_table_810m;
424 frac = frac_table_675m;
426 for (; frac->num; frac++) {
428 request *= frac->den;
429 request = div_s64(request, frac->num);
430 if ((src_rate < (request - delta)) ||
431 (src_rate > (request + delta)))
434 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
437 f.pre_div >>= CFG_SRC_DIV_SHIFT;
442 return clk_rcg2_configure(rcg, &f);
448 static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw,
449 unsigned long rate, unsigned long parent_rate, u8 index)
451 /* Parent index is set statically in frequency table */
452 return clk_edp_pixel_set_rate(hw, rate, parent_rate);
455 static int clk_edp_pixel_determine_rate(struct clk_hw *hw,
456 struct clk_rate_request *req)
458 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
459 const struct freq_tbl *f = rcg->freq_tbl;
460 const struct frac_entry *frac;
463 u32 mask = BIT(rcg->hid_width) - 1;
465 int index = qcom_find_src_index(hw, rcg->parent_map, f->src);
467 /* Force the correct parent */
468 req->best_parent_hw = clk_hw_get_parent_by_index(hw, index);
469 req->best_parent_rate = clk_hw_get_rate(req->best_parent_hw);
471 if (req->best_parent_rate == 810000000)
472 frac = frac_table_810m;
474 frac = frac_table_675m;
476 for (; frac->num; frac++) {
478 request *= frac->den;
479 request = div_s64(request, frac->num);
480 if ((req->best_parent_rate < (request - delta)) ||
481 (req->best_parent_rate > (request + delta)))
484 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
486 hid_div >>= CFG_SRC_DIV_SHIFT;
489 req->rate = calc_rate(req->best_parent_rate,
490 frac->num, frac->den,
491 !!frac->den, hid_div);
498 const struct clk_ops clk_edp_pixel_ops = {
499 .is_enabled = clk_rcg2_is_enabled,
500 .get_parent = clk_rcg2_get_parent,
501 .set_parent = clk_rcg2_set_parent,
502 .recalc_rate = clk_rcg2_recalc_rate,
503 .set_rate = clk_edp_pixel_set_rate,
504 .set_rate_and_parent = clk_edp_pixel_set_rate_and_parent,
505 .determine_rate = clk_edp_pixel_determine_rate,
507 EXPORT_SYMBOL_GPL(clk_edp_pixel_ops);
509 static int clk_byte_determine_rate(struct clk_hw *hw,
510 struct clk_rate_request *req)
512 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
513 const struct freq_tbl *f = rcg->freq_tbl;
514 int index = qcom_find_src_index(hw, rcg->parent_map, f->src);
515 unsigned long parent_rate, div;
516 u32 mask = BIT(rcg->hid_width) - 1;
522 req->best_parent_hw = p = clk_hw_get_parent_by_index(hw, index);
523 req->best_parent_rate = parent_rate = clk_hw_round_rate(p, req->rate);
525 div = DIV_ROUND_UP((2 * parent_rate), req->rate) - 1;
526 div = min_t(u32, div, mask);
528 req->rate = calc_rate(parent_rate, 0, 0, 0, div);
533 static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate,
534 unsigned long parent_rate)
536 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
537 struct freq_tbl f = *rcg->freq_tbl;
539 u32 mask = BIT(rcg->hid_width) - 1;
541 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
542 div = min_t(u32, div, mask);
546 return clk_rcg2_configure(rcg, &f);
549 static int clk_byte_set_rate_and_parent(struct clk_hw *hw,
550 unsigned long rate, unsigned long parent_rate, u8 index)
552 /* Parent index is set statically in frequency table */
553 return clk_byte_set_rate(hw, rate, parent_rate);
556 const struct clk_ops clk_byte_ops = {
557 .is_enabled = clk_rcg2_is_enabled,
558 .get_parent = clk_rcg2_get_parent,
559 .set_parent = clk_rcg2_set_parent,
560 .recalc_rate = clk_rcg2_recalc_rate,
561 .set_rate = clk_byte_set_rate,
562 .set_rate_and_parent = clk_byte_set_rate_and_parent,
563 .determine_rate = clk_byte_determine_rate,
565 EXPORT_SYMBOL_GPL(clk_byte_ops);
567 static int clk_byte2_determine_rate(struct clk_hw *hw,
568 struct clk_rate_request *req)
570 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
571 unsigned long parent_rate, div;
572 u32 mask = BIT(rcg->hid_width) - 1;
574 unsigned long rate = req->rate;
579 p = req->best_parent_hw;
580 req->best_parent_rate = parent_rate = clk_hw_round_rate(p, rate);
582 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
583 div = min_t(u32, div, mask);
585 req->rate = calc_rate(parent_rate, 0, 0, 0, div);
590 static int clk_byte2_set_rate(struct clk_hw *hw, unsigned long rate,
591 unsigned long parent_rate)
593 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
594 struct freq_tbl f = { 0 };
596 int i, num_parents = clk_hw_get_num_parents(hw);
597 u32 mask = BIT(rcg->hid_width) - 1;
600 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
601 div = min_t(u32, div, mask);
605 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
606 cfg &= CFG_SRC_SEL_MASK;
607 cfg >>= CFG_SRC_SEL_SHIFT;
609 for (i = 0; i < num_parents; i++) {
610 if (cfg == rcg->parent_map[i].cfg) {
611 f.src = rcg->parent_map[i].src;
612 return clk_rcg2_configure(rcg, &f);
619 static int clk_byte2_set_rate_and_parent(struct clk_hw *hw,
620 unsigned long rate, unsigned long parent_rate, u8 index)
622 /* Read the hardware to determine parent during set_rate */
623 return clk_byte2_set_rate(hw, rate, parent_rate);
626 const struct clk_ops clk_byte2_ops = {
627 .is_enabled = clk_rcg2_is_enabled,
628 .get_parent = clk_rcg2_get_parent,
629 .set_parent = clk_rcg2_set_parent,
630 .recalc_rate = clk_rcg2_recalc_rate,
631 .set_rate = clk_byte2_set_rate,
632 .set_rate_and_parent = clk_byte2_set_rate_and_parent,
633 .determine_rate = clk_byte2_determine_rate,
635 EXPORT_SYMBOL_GPL(clk_byte2_ops);
637 static const struct frac_entry frac_table_pixel[] = {
645 static int clk_pixel_determine_rate(struct clk_hw *hw,
646 struct clk_rate_request *req)
648 unsigned long request, src_rate;
650 const struct frac_entry *frac = frac_table_pixel;
652 for (; frac->num; frac++) {
653 request = (req->rate * frac->den) / frac->num;
655 src_rate = clk_hw_round_rate(req->best_parent_hw, request);
656 if ((src_rate < (request - delta)) ||
657 (src_rate > (request + delta)))
660 req->best_parent_rate = src_rate;
661 req->rate = (src_rate * frac->num) / frac->den;
668 static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
669 unsigned long parent_rate)
671 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
672 struct freq_tbl f = { 0 };
673 const struct frac_entry *frac = frac_table_pixel;
674 unsigned long request;
676 u32 mask = BIT(rcg->hid_width) - 1;
678 int i, num_parents = clk_hw_get_num_parents(hw);
680 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
681 cfg &= CFG_SRC_SEL_MASK;
682 cfg >>= CFG_SRC_SEL_SHIFT;
684 for (i = 0; i < num_parents; i++)
685 if (cfg == rcg->parent_map[i].cfg) {
686 f.src = rcg->parent_map[i].src;
690 for (; frac->num; frac++) {
691 request = (rate * frac->den) / frac->num;
693 if ((parent_rate < (request - delta)) ||
694 (parent_rate > (request + delta)))
697 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
700 f.pre_div >>= CFG_SRC_DIV_SHIFT;
705 return clk_rcg2_configure(rcg, &f);
710 static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
711 unsigned long parent_rate, u8 index)
713 return clk_pixel_set_rate(hw, rate, parent_rate);
716 const struct clk_ops clk_pixel_ops = {
717 .is_enabled = clk_rcg2_is_enabled,
718 .get_parent = clk_rcg2_get_parent,
719 .set_parent = clk_rcg2_set_parent,
720 .recalc_rate = clk_rcg2_recalc_rate,
721 .set_rate = clk_pixel_set_rate,
722 .set_rate_and_parent = clk_pixel_set_rate_and_parent,
723 .determine_rate = clk_pixel_determine_rate,
725 EXPORT_SYMBOL_GPL(clk_pixel_ops);
727 static int clk_gfx3d_determine_rate(struct clk_hw *hw,
728 struct clk_rate_request *req)
730 struct clk_rate_request parent_req = { };
731 struct clk_hw *p2, *p8, *p9, *xo;
732 unsigned long p9_rate;
735 xo = clk_hw_get_parent_by_index(hw, 0);
736 if (req->rate == clk_hw_get_rate(xo)) {
737 req->best_parent_hw = xo;
741 p9 = clk_hw_get_parent_by_index(hw, 2);
742 p2 = clk_hw_get_parent_by_index(hw, 3);
743 p8 = clk_hw_get_parent_by_index(hw, 4);
745 /* PLL9 is a fixed rate PLL */
746 p9_rate = clk_hw_get_rate(p9);
748 parent_req.rate = req->rate = min(req->rate, p9_rate);
749 if (req->rate == p9_rate) {
750 req->rate = req->best_parent_rate = p9_rate;
751 req->best_parent_hw = p9;
755 if (req->best_parent_hw == p9) {
756 /* Are we going back to a previously used rate? */
757 if (clk_hw_get_rate(p8) == req->rate)
758 req->best_parent_hw = p8;
760 req->best_parent_hw = p2;
761 } else if (req->best_parent_hw == p8) {
762 req->best_parent_hw = p2;
764 req->best_parent_hw = p8;
767 ret = __clk_determine_rate(req->best_parent_hw, &parent_req);
771 req->rate = req->best_parent_rate = parent_req.rate;
776 static int clk_gfx3d_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
777 unsigned long parent_rate, u8 index)
779 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
783 /* Just mux it, we don't use the division or m/n hardware */
784 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
785 ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, cfg);
789 return update_config(rcg);
792 static int clk_gfx3d_set_rate(struct clk_hw *hw, unsigned long rate,
793 unsigned long parent_rate)
796 * We should never get here; clk_gfx3d_determine_rate() should always
797 * make us use a different parent than what we're currently using, so
798 * clk_gfx3d_set_rate_and_parent() should always be called.
803 const struct clk_ops clk_gfx3d_ops = {
804 .is_enabled = clk_rcg2_is_enabled,
805 .get_parent = clk_rcg2_get_parent,
806 .set_parent = clk_rcg2_set_parent,
807 .recalc_rate = clk_rcg2_recalc_rate,
808 .set_rate = clk_gfx3d_set_rate,
809 .set_rate_and_parent = clk_gfx3d_set_rate_and_parent,
810 .determine_rate = clk_gfx3d_determine_rate,
812 EXPORT_SYMBOL_GPL(clk_gfx3d_ops);