drm/i915/dg1: Add DG1 power wells

TGL power wells can be re-used for DG1 with the exception of the fake
power well for TC_COLD.

v2: use logic to skip power wells while copying instead of duplicating
the definition of TGL power wells (Matt Roper)

Bspec: 49182

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201014191937.1266226-3-lucas.demarchi@intel.com

drivers/gpu/drm/i915/display/intel_display_power.c

@@ -4150,7 +4150,7 @@ static const struct i915_power_well_desc tgl_power_wells[] = {
 		.name = "TC cold off",
 		.domains = TGL_TC_COLD_OFF_POWER_DOMAINS,
 		.ops = &tgl_tc_cold_off_ops,
-		.id = DISP_PW_ID_NONE,
+		.id = TGL_DISP_PW_TC_COLD_OFF,
 	},
 	{
 		.name = "AUX A",
@@ -4634,7 +4634,10 @@ int intel_power_domains_init(struct drm_i915_private *dev_priv)
 	 * The enabling order will be from lower to higher indexed wells,
 	 * the disabling order is reversed.
 	 */
-	if (IS_ROCKETLAKE(dev_priv)) {
+	if (IS_DG1(dev_priv)) {
+		err = set_power_wells_mask(power_domains, tgl_power_wells,
+					   BIT_ULL(TGL_DISP_PW_TC_COLD_OFF));
+	} else if (IS_ROCKETLAKE(dev_priv)) {
 		err = set_power_wells(power_domains, rkl_power_wells);
 	} else if (IS_GEN(dev_priv, 12)) {
 		err = set_power_wells(power_domains, tgl_power_wells);

drivers/gpu/drm/i915/display/intel_display_power.h

@@ -105,6 +105,7 @@ enum i915_power_well_id {
 	CNL_DISP_PW_DDI_F_AUX,
 	ICL_DISP_PW_3,
 	SKL_DISP_DC_OFF,
+	TGL_DISP_PW_TC_COLD_OFF,
 };
 
 #define POWER_DOMAIN_PIPE(pipe) ((pipe) + POWER_DOMAIN_PIPE_A)