diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/gpu/divider_range.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/gpu/divider_range.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/gpu/divider_range.c b/drivers/gpu/drm/amd/display/dc/gpu/divider_range.c new file mode 100644 index 000000000000..59d44004411b --- /dev/null +++ b/drivers/gpu/drm/amd/display/dc/gpu/divider_range.c @@ -0,0 +1,127 @@ +/* + * Copyright 2012-15 Advanced Micro Devices, Inc. + * + * 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: AMD + * + */ +#include "dm_services.h" +#include "divider_range.h" + +bool dal_divider_range_construct( + struct divider_range *div_range, + uint32_t range_start, + uint32_t range_step, + uint32_t did_min, + uint32_t did_max) +{ + div_range->div_range_start = range_start; + div_range->div_range_step = range_step; + div_range->did_min = did_min; + div_range->did_max = did_max; + + if (div_range->div_range_step == 0) { + div_range->div_range_step = 1; + /*div_range_step cannot be zero*/ + BREAK_TO_DEBUGGER(); + } + /* Calculate this based on the other inputs.*/ + /* See DividerRange.h for explanation of */ + /* the relationship between divider id (DID) and a divider.*/ + /* Number of Divider IDs = (Maximum Divider ID - Minimum Divider ID)*/ + /* Maximum divider identified in this range = + * (Number of Divider IDs)*Step size between dividers + * + The start of this range.*/ + div_range->div_range_end = (did_max - did_min) * range_step + + range_start; + return true; +} + +static uint32_t dal_divider_range_calc_divider( + struct divider_range *div_range, + uint32_t did) +{ + /* Is this DID within our range?*/ + if ((did < div_range->did_min) || (did >= div_range->did_max)) + return INVALID_DIVIDER; + + return ((did - div_range->did_min) * div_range->div_range_step) + + div_range->div_range_start; + +} + +static uint32_t dal_divider_range_calc_did( + struct divider_range *div_range, + uint32_t div) +{ + uint32_t did; + /* Check before dividing.*/ + if (div_range->div_range_step == 0) { + div_range->div_range_step = 1; + /*div_range_step cannot be zero*/ + BREAK_TO_DEBUGGER(); + } + /* Is this divider within our range?*/ + if ((div < div_range->div_range_start) + || (div >= div_range->div_range_end)) + return INVALID_DID; +/* did = (divider - range_start + (range_step-1)) / range_step) + did_min*/ + did = div - div_range->div_range_start; + did += div_range->div_range_step - 1; + did /= div_range->div_range_step; + did += div_range->did_min; + return did; +} + +uint32_t dal_divider_range_get_divider( + struct divider_range *div_range, + uint32_t ranges_num, + uint32_t did) +{ + uint32_t div = INVALID_DIVIDER; + uint32_t i; + + for (i = 0; i < ranges_num; i++) { + /* Calculate divider with given divider ID*/ + div = dal_divider_range_calc_divider(&div_range[i], did); + /* Found a valid return divider*/ + if (div != INVALID_DIVIDER) + break; + } + return div; +} +uint32_t dal_divider_range_get_did( + struct divider_range *div_range, + uint32_t ranges_num, + uint32_t divider) +{ + uint32_t did = INVALID_DID; + uint32_t i; + + for (i = 0; i < ranges_num; i++) { + /* CalcDid returns InvalidDid if a divider ID isn't found*/ + did = dal_divider_range_calc_did(&div_range[i], divider); + /* Found a valid return did*/ + if (did != INVALID_DID) + break; + } + return did; +} + |