Lines Matching +full:n +full:-
1 // SPDX-License-Identifier: GPL-2.0+
3 * Program for finding M & N values for DPLLs
17 * get_m_n_optimized() - Finds optimal DPLL multiplier(M) and divider(N)
21 * target_freq_khz - output frequency required in KHz
22 * ref_freq_khz - reference(input) frequency in KHz
23 * m - pointer to computed M value
24 * n - pointer to computed N value
25 * tolerance_khz - tolerance for the output frequency. When the algorithm
26 * succeeds in finding vialble M and N values the corresponding output
28 * [target_freq_khz - tolerance_khz, target_freq_khz]
31 * Fdpll = (2 * M * Fref) / (N + 1)
33 * Considerations for lock-time:
34 * - Smaller the N, better lock-time, especially lock-time will be
35 * - For acceptable lock-times:
39 * - The difference in power for different N values giving the same
40 * output is negligible. So, we optimize for lock-time
42 * Hard-constraints:
43 * - N can not be greater than 127(7 bit field for representing N)
49 int get_m_n_optimized(u32 target_freq_khz, u32 ref_freq_khz, u32 *M, u32 *N) in get_m_n_optimized() argument
53 u32 m, n; in get_m_n_optimized() local
54 n = 1; in get_m_n_optimized()
56 m = target_freq_khz / ref_freq_khz / 2 * n; in get_m_n_optimized()
59 freq = ref_freq_khz * 2 * m / n; in get_m_n_optimized()
62 m--; in get_m_n_optimized()
71 n_optimal = n; in get_m_n_optimized()
73 n++; in get_m_n_optimized()
75 ((ref_freq_khz / n) < 1000)) { in get_m_n_optimized()
79 n--; in get_m_n_optimized()
81 *N = n_optimal - 1; in get_m_n_optimized()
82 printf("ref %d m %d n %d target %d locked %d\n", ref_freq_khz, in get_m_n_optimized()
83 m_optimal, n_optimal - 1, target_freq_khz, freq_optimal); in get_m_n_optimized()
89 u32 m, n; in main() local
90 printf("\nMPU - 2000000\n"); in main()
91 get_m_n_optimized(2000000, 12000, &m, &n); in main()
92 get_m_n_optimized(2000000, 13000, &m, &n); in main()
93 get_m_n_optimized(2000000, 16800, &m, &n); in main()
94 get_m_n_optimized(2000000, 19200, &m, &n); in main()
95 get_m_n_optimized(2000000, 26000, &m, &n); in main()
96 get_m_n_optimized(2000000, 27000, &m, &n); in main()
97 get_m_n_optimized(2000000, 38400, &m, &n); in main()
99 printf("\nMPU - 1200000\n"); in main()
100 get_m_n_optimized(1200000, 12000, &m, &n); in main()
101 get_m_n_optimized(1200000, 13000, &m, &n); in main()
102 get_m_n_optimized(1200000, 16800, &m, &n); in main()
103 get_m_n_optimized(1200000, 19200, &m, &n); in main()
104 get_m_n_optimized(1200000, 26000, &m, &n); in main()
105 get_m_n_optimized(1200000, 27000, &m, &n); in main()
106 get_m_n_optimized(1200000, 38400, &m, &n); in main()
108 printf("\nMPU - 1584000\n"); in main()
109 get_m_n_optimized(1584000, 12000, &m, &n); in main()
110 get_m_n_optimized(1584000, 13000, &m, &n); in main()
111 get_m_n_optimized(1584000, 16800, &m, &n); in main()
112 get_m_n_optimized(1584000, 19200, &m, &n); in main()
113 get_m_n_optimized(1584000, 26000, &m, &n); in main()
114 get_m_n_optimized(1584000, 27000, &m, &n); in main()
115 get_m_n_optimized(1584000, 38400, &m, &n); in main()
117 printf("\nCore 1600000\n"); in main()
118 get_m_n_optimized(1600000, 12000, &m, &n); in main()
119 get_m_n_optimized(1600000, 13000, &m, &n); in main()
120 get_m_n_optimized(1600000, 16800, &m, &n); in main()
121 get_m_n_optimized(1600000, 19200, &m, &n); in main()
122 get_m_n_optimized(1600000, 26000, &m, &n); in main()
123 get_m_n_optimized(1600000, 27000, &m, &n); in main()
124 get_m_n_optimized(1600000, 38400, &m, &n); in main()
126 printf("\nPER 1536000\n"); in main()
127 get_m_n_optimized(1536000, 12000, &m, &n); in main()
128 get_m_n_optimized(1536000, 13000, &m, &n); in main()
129 get_m_n_optimized(1536000, 16800, &m, &n); in main()
130 get_m_n_optimized(1536000, 19200, &m, &n); in main()
131 get_m_n_optimized(1536000, 26000, &m, &n); in main()
132 get_m_n_optimized(1536000, 27000, &m, &n); in main()
133 get_m_n_optimized(1536000, 38400, &m, &n); in main()
135 printf("\nIVA 1862000\n"); in main()
136 get_m_n_optimized(1862000, 12000, &m, &n); in main()
137 get_m_n_optimized(1862000, 13000, &m, &n); in main()
138 get_m_n_optimized(1862000, 16800, &m, &n); in main()
139 get_m_n_optimized(1862000, 19200, &m, &n); in main()
140 get_m_n_optimized(1862000, 26000, &m, &n); in main()
141 get_m_n_optimized(1862000, 27000, &m, &n); in main()
142 get_m_n_optimized(1862000, 38400, &m, &n); in main()
144 printf("\nIVA Nitro - 1290000\n"); in main()
145 get_m_n_optimized(1290000, 12000, &m, &n); in main()
146 get_m_n_optimized(1290000, 13000, &m, &n); in main()
147 get_m_n_optimized(1290000, 16800, &m, &n); in main()
148 get_m_n_optimized(1290000, 19200, &m, &n); in main()
149 get_m_n_optimized(1290000, 26000, &m, &n); in main()
150 get_m_n_optimized(1290000, 27000, &m, &n); in main()
151 get_m_n_optimized(1290000, 38400, &m, &n); in main()
153 printf("\nABE 196608 sys clk\n"); in main()
154 get_m_n_optimized(196608, 12000, &m, &n); in main()
155 get_m_n_optimized(196608, 13000, &m, &n); in main()
156 get_m_n_optimized(196608, 16800, &m, &n); in main()
157 get_m_n_optimized(196608, 19200, &m, &n); in main()
158 get_m_n_optimized(196608, 26000, &m, &n); in main()
159 get_m_n_optimized(196608, 27000, &m, &n); in main()
160 get_m_n_optimized(196608, 38400, &m, &n); in main()
162 printf("\nABE 196608 32K\n"); in main()
163 get_m_n_optimized(196608000/4, 32768, &m, &n); in main()
165 printf("\nUSB 1920000\n"); in main()
166 get_m_n_optimized(1920000, 12000, &m, &n); in main()
167 get_m_n_optimized(1920000, 13000, &m, &n); in main()
168 get_m_n_optimized(1920000, 16800, &m, &n); in main()
169 get_m_n_optimized(1920000, 19200, &m, &n); in main()
170 get_m_n_optimized(1920000, 26000, &m, &n); in main()
171 get_m_n_optimized(1920000, 27000, &m, &n); in main()
172 get_m_n_optimized(1920000, 38400, &m, &n); in main()
174 printf("\nCore ES1 1523712\n"); in main()
175 get_m_n_optimized(1524000, 12000, &m, &n); in main()
176 get_m_n_optimized(1524000, 13000, &m, &n); in main()
177 get_m_n_optimized(1524000, 16800, &m, &n); in main()
178 get_m_n_optimized(1524000, 19200, &m, &n); in main()
179 get_m_n_optimized(1524000, 26000, &m, &n); in main()
180 get_m_n_optimized(1524000, 27000, &m, &n); in main()
183 get_m_n_optimized(1523712, 38400, &m, &n); in main()