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authorAlex Deucher <alexander.deucher@amd.com>2013-05-15 17:25:03 -0400
committerAlex Deucher <alexander.deucher@amd.com>2013-08-30 16:30:26 -0400
commit61fb192a1cf87413e19f565495595c8c116d7c10 (patch)
tree7109a80a41a5e986964aefc4446212d65b183ad0 /drivers/gpu/drm/radeon
parentc4453e66130119d9f2947ee051d598aae6823d49 (diff)
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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>
Diffstat (limited to 'drivers/gpu/drm/radeon')
-rw-r--r--drivers/gpu/drm/radeon/r600_dpm.c10
-rw-r--r--drivers/gpu/drm/radeon/r600_dpm.h1
2 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r600_dpm.c b/drivers/gpu/drm/radeon/r600_dpm.c
index 34ea5d6ee4be..89c46c55f93d 100644
--- a/drivers/gpu/drm/radeon/r600_dpm.c
+++ b/drivers/gpu/drm/radeon/r600_dpm.c
@@ -1246,3 +1246,13 @@ u16 r600_get_pcie_lane_support(struct radeon_device *rdev,
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];
+}
diff --git a/drivers/gpu/drm/radeon/r600_dpm.h b/drivers/gpu/drm/radeon/r600_dpm.h
index 71d5d93c371b..8dc1fbd9dbf1 100644
--- a/drivers/gpu/drm/radeon/r600_dpm.h
+++ b/drivers/gpu/drm/radeon/r600_dpm.h
@@ -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 asic_lanes,
u16 default_lanes);
+u8 r600_encode_pci_lane_width(u32 lanes);
#endif