drm/radeon: check if pcie gen 2 is already enabled (v2)

If so, skip enabling it to save time.

v2: coding style fixes

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 70c800ff6190..cda280d157da 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -3703,6 +3703,12 @@ static void r600_pcie_gen2_enable(struct radeon_device *rdev)
         if (!(mask & DRM_PCIE_SPEED_50))
                 return;
 
+        speed_cntl = RREG32_PCIE_P(PCIE_LC_SPEED_CNTL);
+        if (speed_cntl & LC_CURRENT_DATA_RATE) {
+                DRM_INFO("PCIE gen 2 link speeds already enabled\n");
+                return;
+        }
+
         DRM_INFO("enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0\n");
 
         /* 55 nm r6xx asics */