drm/radeon/dpm: add pcie gen helper function
Add a helper function to determine the preferred
pcie gen based on the card, system, and circumstance.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/r600_dpm.c b/drivers/gpu/drm/radeon/r600_dpm.c
index 2e5ec65..28177da 100644
--- a/drivers/gpu/drm/radeon/r600_dpm.c
+++ b/drivers/gpu/drm/radeon/r600_dpm.c
@@ -997,3 +997,26 @@
if (rdev->pm.dpm.dyn_state.ppm_table)
kfree(rdev->pm.dpm.dyn_state.ppm_table);
}
+
+enum radeon_pcie_gen r600_get_pcie_gen_support(struct radeon_device *rdev,
+ u32 sys_mask,
+ enum radeon_pcie_gen asic_gen,
+ enum radeon_pcie_gen default_gen)
+{
+ switch (asic_gen) {
+ case RADEON_PCIE_GEN1:
+ return RADEON_PCIE_GEN1;
+ case RADEON_PCIE_GEN2:
+ return RADEON_PCIE_GEN2;
+ case RADEON_PCIE_GEN3:
+ return RADEON_PCIE_GEN3;
+ default:
+ if ((sys_mask & DRM_PCIE_SPEED_80) && (default_gen == RADEON_PCIE_GEN3))
+ return RADEON_PCIE_GEN3;
+ else if ((sys_mask & DRM_PCIE_SPEED_50) && (default_gen == RADEON_PCIE_GEN2))
+ return RADEON_PCIE_GEN2;
+ else
+ return RADEON_PCIE_GEN1;
+ }
+ return RADEON_PCIE_GEN1;
+}
diff --git a/drivers/gpu/drm/radeon/r600_dpm.h b/drivers/gpu/drm/radeon/r600_dpm.h
index c6b9e30..a95ab21 100644
--- a/drivers/gpu/drm/radeon/r600_dpm.h
+++ b/drivers/gpu/drm/radeon/r600_dpm.h
@@ -218,4 +218,9 @@
int r600_parse_extended_power_table(struct radeon_device *rdev);
void r600_free_extended_power_table(struct radeon_device *rdev);
+enum radeon_pcie_gen r600_get_pcie_gen_support(struct radeon_device *rdev,
+ u32 sys_mask,
+ enum radeon_pcie_gen asic_gen,
+ enum radeon_pcie_gen default_gen);
+
#endif