drm/i915/tgl: rename TRANSCODER_EDP_VDSC to use on transcoder A

On TGL the special EDP transcoder is gone and it should be handled by
transcoder A.

v2 (Lucas):
  - Reuse POWER_DOMAIN_TRANSCODER_EDP_VDSC (suggested by Ville)
  - Use crtc->dev since new_crtc_state->state may be NULL on atomic
    commit (suggested by Maarten)
v3 (Lucas):
  - Rename power domain so it's clear it can also be used for transcoder
    A in TGL (requested by José and Manasi)

Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190711173115.28296-8-lucas.demarchi@intel.com

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

@@ -48,8 +48,8 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
 		return "TRANSCODER_C";
 	case POWER_DOMAIN_TRANSCODER_EDP:
 		return "TRANSCODER_EDP";
-	case POWER_DOMAIN_TRANSCODER_EDP_VDSC:
-		return "TRANSCODER_EDP_VDSC";
+	case POWER_DOMAIN_TRANSCODER_VDSC_PW2:
+		return "TRANSCODER_VDSC_PW2";
 	case POWER_DOMAIN_TRANSCODER_DSI_A:
 		return "TRANSCODER_DSI_A";
 	case POWER_DOMAIN_TRANSCODER_DSI_C:
@@ -2450,7 +2450,7 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
 	 */
 #define ICL_PW_2_POWER_DOMAINS (			\
 	ICL_PW_3_POWER_DOMAINS |			\
-	BIT_ULL(POWER_DOMAIN_TRANSCODER_EDP_VDSC) |		\
+	BIT_ULL(POWER_DOMAIN_TRANSCODER_VDSC_PW2) |		\
 	BIT_ULL(POWER_DOMAIN_INIT))
 	/*
 	 * - KVMR (HW control)

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

@@ -25,7 +25,8 @@ enum intel_display_power_domain {
 	POWER_DOMAIN_TRANSCODER_B,
 	POWER_DOMAIN_TRANSCODER_C,
 	POWER_DOMAIN_TRANSCODER_EDP,
-	POWER_DOMAIN_TRANSCODER_EDP_VDSC,
+	/* VDSC/joining for TRANSCODER_EDP (ICL) or TRANSCODER_A (TGL) */
+	POWER_DOMAIN_TRANSCODER_VDSC_PW2,
 	POWER_DOMAIN_TRANSCODER_DSI_A,
 	POWER_DOMAIN_TRANSCODER_DSI_C,
 	POWER_DOMAIN_PORT_DDI_A_LANES,

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

@@ -459,17 +459,23 @@ int intel_dp_compute_dsc_params(struct intel_dp *intel_dp,
 enum intel_display_power_domain
 intel_dsc_power_domain(const struct intel_crtc_state *crtc_state)
 {
+	struct drm_i915_private *i915 = to_i915(crtc_state->base.crtc->dev);
 	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 
 	/*
-	 * On ICL VDSC/joining for eDP transcoder uses a separate power well PW2
-	 * This requires POWER_DOMAIN_TRANSCODER_EDP_VDSC power domain.
+	 * On ICL VDSC/joining for eDP transcoder uses a separate power well,
+	 * PW2. This requires POWER_DOMAIN_TRANSCODER_VDSC_PW2 power domain.
 	 * For any other transcoder, VDSC/joining uses the power well associated
 	 * with the pipe/transcoder in use. Hence another reference on the
 	 * transcoder power domain will suffice.
+	 *
+	 * On TGL we have the same mapping, but for transcoder A (the special
+	 * TRANSCODER_EDP is gone).
 	 */
-	if (cpu_transcoder == TRANSCODER_EDP)
-		return POWER_DOMAIN_TRANSCODER_EDP_VDSC;
+	if (INTEL_GEN(i915) >= 12 && cpu_transcoder == TRANSCODER_A)
+		return POWER_DOMAIN_TRANSCODER_VDSC_PW2;
+	else if (cpu_transcoder == TRANSCODER_EDP)
+		return POWER_DOMAIN_TRANSCODER_VDSC_PW2;
 	else
 		return POWER_DOMAIN_TRANSCODER(cpu_transcoder);
 }