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

We weren't properly catching errors in dpm_enable()
and dpm_set_power_state().
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Add a way to look up the bootup mvdd.  Required for DPM on SI.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

SI uses a new atom table.  Required for DPM on SI.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

Needed to properly handle dynamic state adjustment.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

This adds dpm support for rv6xx asics.  This includes:
- clockgating
- dynamic engine clock scaling
- dynamic memory clock scaling
- dynamic voltage scaling
- dynamic pcie gen1/gen2 switching

Set radeon.dpm=1 to enable.

v2: remove duplicate line
v3: fix thermal interrupt check noticed by Jerome
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>