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drm/radeon/kms: add functions to get current pcie lanes

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Currently unused.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher
2009-12-23 10:07:50 -05:00
committed by Dave Airlie
parent c913e23a14
commit c836a41267
3 changed files with 44 additions and 0 deletions
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31
drivers/gpu/drm/radeon/r300.c
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@@ -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)
{