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drm/radeon/dpm: add a helper to encode pcie lane setting 

convert from number of lanes to register setting.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2013-05-15 17:25:03 -04:00
parent c4453e6613
commit 61fb192a1c
2 changed files with 11 additions and 0 deletions
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10
drivers/gpu/drm/radeon/r600_dpm.c
View File

@ -1246,3 +1246,13 @@ u16 r600_get_pcie_lane_support(struct radeon_device *rdev,
return 16; return 16;
} }
} }
u8 r600_encode_pci_lane_width(u32 lanes)
{
u8 encoded_lanes[] = { 0, 1, 2, 0, 3, 0, 0, 0, 4, 0, 0, 0, 5, 0, 0, 0, 6 };
if (lanes > 16)
return 0;
return encoded_lanes[lanes];
}

1
drivers/gpu/drm/radeon/r600_dpm.h
View File

@ -227,5 +227,6 @@ enum radeon_pcie_gen r600_get_pcie_gen_support(struct radeon_device *rdev,
u16 r600_get_pcie_lane_support(struct radeon_device *rdev, u16 r600_get_pcie_lane_support(struct radeon_device *rdev,
u16 asic_lanes, u16 asic_lanes,
u16 default_lanes); u16 default_lanes);
u8 r600_encode_pci_lane_width(u32 lanes);
#endif #endif