diff options
Diffstat (limited to 'drivers/gpu/drm/amd/powerplay/hwmgr/pppcielanes.c')
| -rw-r--r-- | drivers/gpu/drm/amd/powerplay/hwmgr/pppcielanes.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/pppcielanes.c b/drivers/gpu/drm/amd/powerplay/hwmgr/pppcielanes.c new file mode 100644 index 000000000000..186496a34cbe --- /dev/null +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/pppcielanes.c @@ -0,0 +1,64 @@ +/* + * Copyright 2015 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. + * + */ + +#include <linux/types.h> +#include "atom-types.h" +#include "atombios.h" +#include "pppcielanes.h" + +/** \file + * Functions related to PCIe lane changes. + */ + +/* For converting from number of lanes to lane bits. */ +static const unsigned char pp_r600_encode_lanes[] = { + 0, /* 0 Not Supported */ + 1, /* 1 Lane */ + 2, /* 2 Lanes */ + 0, /* 3 Not Supported */ + 3, /* 4 Lanes */ + 0, /* 5 Not Supported */ + 0, /* 6 Not Supported */ + 0, /* 7 Not Supported */ + 4, /* 8 Lanes */ + 0, /* 9 Not Supported */ + 0, /* 10 Not Supported */ + 0, /* 11 Not Supported */ + 5, /* 12 Lanes (Not actually supported) */ + 0, /* 13 Not Supported */ + 0, /* 14 Not Supported */ + 0, /* 15 Not Supported */ + 6 /* 16 Lanes */ +}; + +static const unsigned char pp_r600_decoded_lanes[8] = { 16, 1, 2, 4, 8, 12, 16, }; + +uint8_t encode_pcie_lane_width(uint32_t num_lanes) +{ + return pp_r600_encode_lanes[num_lanes]; +} + +uint8_t decode_pcie_lane_width(uint32_t num_lanes) +{ + return pp_r600_decoded_lanes[num_lanes]; +} |