1 /*
2  * Copyright 2018 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: AMD
23  *
24  */
25 
26 #include "reg_helper.h"
27 #include "core_types.h"
28 #include "dcn20/dcn20_dccg.h"
29 #include "dcn21_dccg.h"
30 
31 #define TO_DCN_DCCG(dccg)\
32 	container_of(dccg, struct dcn_dccg, base)
33 
34 #define REG(reg) \
35 	(dccg_dcn->regs->reg)
36 
37 #undef FN
38 #define FN(reg_name, field_name) \
39 	dccg_dcn->dccg_shift->field_name, dccg_dcn->dccg_mask->field_name
40 
41 #define CTX \
42 	dccg_dcn->base.ctx
43 #define DC_LOGGER \
44 	dccg->ctx->logger
45 
46 static void dccg21_update_dpp_dto(struct dccg *dccg, int dpp_inst, int req_dppclk)
47 {
48 	struct dcn_dccg *dccg_dcn = TO_DCN_DCCG(dccg);
49 
50 	if (dccg->ref_dppclk) {
51 		int ref_dppclk = dccg->ref_dppclk;
52 		int modulo = ref_dppclk / 10000;
53 		int phase;
54 
55 		if (req_dppclk) {
56 			/*
57 			 * program DPP DTO phase and modulo as below
58 			 * phase = ceiling(dpp_pipe_clk_mhz / 10)
59 			 * module = trunc(dpp_global_clk_mhz / 10)
60 			 *
61 			 * storing frequencies in registers allow dmcub fw
62 			 * to run time lower clocks when possible for power saving
63 			 *
64 			 * ceiling phase and truncate modulo guarentees the divided
65 			 * down per pipe dpp clock has high enough frequency
66 			 */
67 			phase = (req_dppclk + 9999) / 10000;
68 
69 			if (phase > modulo) {
70 				/* phase > modulo result in screen corruption
71 				 * ie phase = 30, mod = 29 for 4k@60 HDMI
72 				 * in these case we don't want pipe clock to be divided
73 				 */
74 				phase = modulo;
75 			}
76 		} else {
77 			/*
78 			 *  set phase to 10 if dpp isn't used to
79 			 *  prevent hard hang if access dpp register
80 			 *  on unused pipe
81 			 *
82 			 *  DTO should be on to divide down un-used
83 			 *  pipe clock for power saving
84 			 */
85 			phase = 10;
86 		}
87 
88 		REG_SET_2(DPPCLK_DTO_PARAM[dpp_inst], 0,
89 				DPPCLK0_DTO_PHASE, phase,
90 				DPPCLK0_DTO_MODULO, modulo);
91 
92 		REG_UPDATE(DPPCLK_DTO_CTRL,
93 				DPPCLK_DTO_ENABLE[dpp_inst], 1);
94 	}
95 
96 	dccg->pipe_dppclk_khz[dpp_inst] = req_dppclk;
97 }
98 
99 
100 static const struct dccg_funcs dccg21_funcs = {
101 	.update_dpp_dto = dccg21_update_dpp_dto,
102 	.get_dccg_ref_freq = dccg2_get_dccg_ref_freq,
103 	.set_fifo_errdet_ovr_en = dccg2_set_fifo_errdet_ovr_en,
104 	.otg_add_pixel = dccg2_otg_add_pixel,
105 	.otg_drop_pixel = dccg2_otg_drop_pixel,
106 	.dccg_init = dccg2_init
107 };
108 
109 struct dccg *dccg21_create(
110 	struct dc_context *ctx,
111 	const struct dccg_registers *regs,
112 	const struct dccg_shift *dccg_shift,
113 	const struct dccg_mask *dccg_mask)
114 {
115 	struct dcn_dccg *dccg_dcn = kzalloc(sizeof(*dccg_dcn), GFP_KERNEL);
116 	struct dccg *base;
117 
118 	if (dccg_dcn == NULL) {
119 		BREAK_TO_DEBUGGER();
120 		return NULL;
121 	}
122 
123 	base = &dccg_dcn->base;
124 	base->ctx = ctx;
125 	base->funcs = &dccg21_funcs;
126 
127 	dccg_dcn->regs = regs;
128 	dccg_dcn->dccg_shift = dccg_shift;
129 	dccg_dcn->dccg_mask = dccg_mask;
130 
131 	return &dccg_dcn->base;
132 }
133