Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Alex Deucher | 450 | 98.25% | 1 | 33.33% |
Ma Jun | 6 | 1.31% | 1 | 33.33% |
Joe Perches | 2 | 0.44% | 1 | 33.33% |
Total | 458 | 3 |
/* * Copyright 2008 Advanced Micro Devices, Inc. * Copyright 2008 Red Hat Inc. * Copyright 2009 Christian König. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Christian König */ #include <linux/hdmi.h> #include <linux/gcd.h> #include <drm/amdgpu_drm.h> #include "amdgpu.h" static const struct amdgpu_afmt_acr amdgpu_afmt_predefined_acr[] = { /* 32kHz 44.1kHz 48kHz */ /* Clock N CTS N CTS N CTS */ { 25175, 4096, 25175, 28224, 125875, 6144, 25175 }, /* 25,20/1.001 MHz */ { 25200, 4096, 25200, 6272, 28000, 6144, 25200 }, /* 25.20 MHz */ { 27000, 4096, 27000, 6272, 30000, 6144, 27000 }, /* 27.00 MHz */ { 27027, 4096, 27027, 6272, 30030, 6144, 27027 }, /* 27.00*1.001 MHz */ { 54000, 4096, 54000, 6272, 60000, 6144, 54000 }, /* 54.00 MHz */ { 54054, 4096, 54054, 6272, 60060, 6144, 54054 }, /* 54.00*1.001 MHz */ { 74176, 4096, 74176, 5733, 75335, 6144, 74176 }, /* 74.25/1.001 MHz */ { 74250, 4096, 74250, 6272, 82500, 6144, 74250 }, /* 74.25 MHz */ { 148352, 4096, 148352, 5733, 150670, 6144, 148352 }, /* 148.50/1.001 MHz */ { 148500, 4096, 148500, 6272, 165000, 6144, 148500 }, /* 148.50 MHz */ }; /* * calculate CTS and N values if they are not found in the table */ static void amdgpu_afmt_calc_cts(uint32_t clock, int *CTS, int *N, int freq) { int n, cts; unsigned long div, mul; /* Safe, but overly large values */ n = 128 * freq; cts = clock * 1000; /* Smallest valid fraction */ div = gcd(n, cts); n /= div; cts /= div; /* * The optimal N is 128*freq/1000. Calculate the closest larger * value that doesn't truncate any bits. */ mul = ((128*freq/1000) + (n-1))/n; n *= mul; cts *= mul; /* Check that we are in spec (not always possible) */ if (n < (128*freq/1500)) pr_warn("Calculated ACR N value is too small. You may experience audio problems.\n"); if (n > (128*freq/300)) pr_warn("Calculated ACR N value is too large. You may experience audio problems.\n"); *N = n; *CTS = cts; DRM_DEBUG("Calculated ACR timing N=%d CTS=%d for frequency %d\n", *N, *CTS, freq); } struct amdgpu_afmt_acr amdgpu_afmt_acr(uint32_t clock) { struct amdgpu_afmt_acr res; u8 i; /* Precalculated values for common clocks */ for (i = 0; i < ARRAY_SIZE(amdgpu_afmt_predefined_acr); i++) { if (amdgpu_afmt_predefined_acr[i].clock == clock) return amdgpu_afmt_predefined_acr[i]; } /* And odd clocks get manually calculated */ amdgpu_afmt_calc_cts(clock, &res.cts_32khz, &res.n_32khz, 32000); amdgpu_afmt_calc_cts(clock, &res.cts_44_1khz, &res.n_44_1khz, 44100); amdgpu_afmt_calc_cts(clock, &res.cts_48khz, &res.n_48khz, 48000); res.clock = clock; return res; }
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