drm/radeon/kms: dynclks fixes

- only r4xx/r5xx/rs6xx/rs740 have clock gating atom table,
so disable it on r6xx.  it's already disabled on r7xx
- check to make sure the clock_gating hook exists before
calling it.  This avoids a segfault on asics without
that function.
- remove unused static power management function.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_asic.h

@@ -549,7 +549,7 @@ static struct radeon_asic r600_asic = {
 	.set_memory_clock = &radeon_atom_set_memory_clock,
 	.get_pcie_lanes = NULL,
 	.set_pcie_lanes = NULL,
-	.set_clock_gating = &radeon_atom_set_clock_gating,
+	.set_clock_gating = NULL,
 	.set_surface_reg = r600_set_surface_reg,
 	.clear_surface_reg = r600_clear_surface_reg,
 	.bandwidth_update = &rv515_bandwidth_update,

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -1780,16 +1780,6 @@ void radeon_atom_set_clock_gating(struct radeon_device *rdev, int enable)
 	atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 }
 
-void radeon_atom_static_pwrmgt_setup(struct radeon_device *rdev, int enable)
-{
-	ENABLE_ASIC_STATIC_PWR_MGT_PS_ALLOCATION args;
-	int index = GetIndexIntoMasterTable(COMMAND, EnableASIC_StaticPwrMgt);
-
-	args.ucEnable = enable;
-
-	atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
-}
-
 uint32_t radeon_atom_get_engine_clock(struct radeon_device *rdev)
 {
 	GET_ENGINE_CLOCK_PS_ALLOCATION args;

drivers/gpu/drm/radeon/radeon_clocks.c

@@ -846,8 +846,10 @@ int radeon_static_clocks_init(struct drm_device *dev)
 	/* XXX make sure engine is idle */
 
 	if (radeon_dynclks != -1) {
-		if (radeon_dynclks)
-			radeon_set_clock_gating(rdev, 1);
+		if (radeon_dynclks) {
+			if (rdev->asic->set_clock_gating)
+				radeon_set_clock_gating(rdev, 1);
+		}
 	}
 	radeon_apply_clock_quirks(rdev);
 	return 0;