drm/i915/dg1: DG1 does not support DC6

DC6 is not supported on DG1, so change the allowed DC mask for DG1.
This is not yet on bspec, but it has been confirmed by HW engineers.

Cc: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201014191937.1266226-9-lucas.demarchi@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 18af078c208b73cd5ecd8edff22d12fe17581d09..45806cfc679aa70920d528f0208f879f52f93bab 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -4492,7 +4492,10 @@ static u32 get_allowed_dc_mask(const struct drm_i915_private *dev_priv,
        int max_dc;
 
        if (INTEL_GEN(dev_priv) >= 12) {
-               max_dc = 4;
+               if (IS_DG1(dev_priv))
+                       max_dc = 3;
+               else
+                       max_dc = 4;
                /*
                 * DC9 has a separate HW flow from the rest of the DC states,
                 * not depending on the DMC firmware. It's needed by system