drm/radeon/kms: auto detect pcie link speed from root port

This check the root ports supported link speeds and enables
GEN2 mode if the 5.0 GT link speed is available.

The first 3.0 cards are SI so they will probably need more investigation.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2012-06-27 08:35:54 +01:00
parent f42977841f
commit 197bbb3d46
4 changed files with 35 additions and 3 deletions

View File

@@ -1112,6 +1112,8 @@ static void rv770_pcie_gen2_enable(struct radeon_device *rdev)
{
u32 link_width_cntl, lanes, speed_cntl, tmp;
u16 link_cntl2;
u32 mask;
int ret;
if (radeon_pcie_gen2 == 0)
return;
@@ -1126,6 +1128,15 @@ static void rv770_pcie_gen2_enable(struct radeon_device *rdev)
if (ASIC_IS_X2(rdev))
return;
ret = drm_pcie_get_speed_cap_mask(rdev->ddev, &mask);
if (ret != 0)
return;
if (!(mask & DRM_PCIE_SPEED_50))
return;
DRM_INFO("enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0\n");
/* advertise upconfig capability */
link_width_cntl = RREG32_PCIE_P(PCIE_LC_LINK_WIDTH_CNTL);
link_width_cntl &= ~LC_UPCONFIGURE_DIS;