diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/r300.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/r300.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r300.c b/drivers/gpu/drm/radeon/r300.c index 748335c5fa84..5897bd00591e 100644 --- a/drivers/gpu/drm/radeon/r300.c +++ b/drivers/gpu/drm/radeon/r300.c @@ -580,6 +580,37 @@ void rv370_set_pcie_lanes(struct radeon_device *rdev, int lanes) } +int rv370_get_pcie_lanes(struct radeon_device *rdev) +{ + u32 link_width_cntl; + + if (rdev->flags & RADEON_IS_IGP) + return 0; + + if (!(rdev->flags & RADEON_IS_PCIE)) + return 0; + + /* FIXME wait for idle */ + + link_width_cntl = RREG32_PCIE(RADEON_PCIE_LC_LINK_WIDTH_CNTL); + + switch ((link_width_cntl & RADEON_PCIE_LC_LINK_WIDTH_RD_MASK) >> RADEON_PCIE_LC_LINK_WIDTH_RD_SHIFT) { + case RADEON_PCIE_LC_LINK_WIDTH_X0: + return 0; + case RADEON_PCIE_LC_LINK_WIDTH_X1: + return 1; + case RADEON_PCIE_LC_LINK_WIDTH_X2: + return 2; + case RADEON_PCIE_LC_LINK_WIDTH_X4: + return 4; + case RADEON_PCIE_LC_LINK_WIDTH_X8: + return 8; + case RADEON_PCIE_LC_LINK_WIDTH_X16: + default: + return 16; + } +} + #if defined(CONFIG_DEBUG_FS) static int rv370_debugfs_pcie_gart_info(struct seq_file *m, void *data) { |