drm/i915: Extract hsw_chicken_trans_reg()

We have the same code to determine the CHICKEN_TRANS register
offset sprinkled in a dozen places. Hoover it up into a small
helper.

TODO: find a better home for this
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231101114212.9345-2-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -3115,6 +3115,15 @@ static void intel_enable_ddi_dp(struct intel_atomic_state *state,
 	trans_port_sync_stop_link_train(state, encoder, crtc_state);
 }
 
+/* FIXME bad home for this function */
+i915_reg_t hsw_chicken_trans_reg(struct drm_i915_private *i915,
+				 enum transcoder cpu_transcoder)
+{
+	return DISPLAY_VER(i915) >= 14 ?
+		MTL_CHICKEN_TRANS(cpu_transcoder) :
+		CHICKEN_TRANS(cpu_transcoder);
+}
+
 static i915_reg_t
 gen9_chicken_trans_reg_by_port(struct drm_i915_private *dev_priv,
 			       enum port port)

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

@@ -27,6 +27,8 @@ i915_reg_t dp_tp_ctl_reg(struct intel_encoder *encoder,
 			 const struct intel_crtc_state *crtc_state);
 i915_reg_t dp_tp_status_reg(struct intel_encoder *encoder,
 			    const struct intel_crtc_state *crtc_state);
+i915_reg_t hsw_chicken_trans_reg(struct drm_i915_private *i915,
+				 enum transcoder cpu_transcoder);
 void intel_ddi_fdi_post_disable(struct intel_atomic_state *state,
 				struct intel_encoder *intel_encoder,
 				const struct intel_crtc_state *old_crtc_state,

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

@@ -488,11 +488,8 @@ void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state)
 
 	intel_de_write(dev_priv, reg, val);
 
-	if (DISPLAY_VER(dev_priv) >= 14)
-		intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(cpu_transcoder),
-			     FECSTALL_DIS_DPTSTREAM_DPTTG, 0);
-	else if (DISPLAY_VER(dev_priv) >= 12)
-		intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder),
+	if (DISPLAY_VER(dev_priv) >= 12)
+		intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, cpu_transcoder),
 			     FECSTALL_DIS_DPTSTREAM_DPTTG, 0);
 
 	if ((val & TRANSCONF_ENABLE) == 0)
@@ -1503,12 +1500,9 @@ static void hsw_set_linetime_wm(const struct intel_crtc_state *crtc_state)
 static void hsw_set_frame_start_delay(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
-	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	enum transcoder transcoder = crtc_state->cpu_transcoder;
-	i915_reg_t reg = DISPLAY_VER(dev_priv) >= 14 ? MTL_CHICKEN_TRANS(transcoder) :
-			 CHICKEN_TRANS(transcoder);
+	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
 
-	intel_de_rmw(dev_priv, reg,
+	intel_de_rmw(i915, hsw_chicken_trans_reg(i915, crtc_state->cpu_transcoder),
 		     HSW_FRAME_START_DELAY_MASK,
 		     HSW_FRAME_START_DELAY(crtc_state->framestart_delay - 1));
 }
@@ -3792,9 +3786,7 @@ static bool hsw_get_pipe_config(struct intel_crtc *crtc,
 	}
 
 	if (!transcoder_is_dsi(pipe_config->cpu_transcoder)) {
-		tmp = intel_de_read(dev_priv, DISPLAY_VER(dev_priv) >= 14 ?
-				    MTL_CHICKEN_TRANS(pipe_config->cpu_transcoder) :
-				    CHICKEN_TRANS(pipe_config->cpu_transcoder));
+		tmp = intel_de_read(dev_priv, hsw_chicken_trans_reg(dev_priv, pipe_config->cpu_transcoder));
 
 		pipe_config->framestart_delay = REG_FIELD_GET(HSW_FRAME_START_DELAY_MASK, tmp) + 1;
 	} else {

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

@@ -817,12 +817,8 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
 	drm_dp_add_payload_part2(&intel_dp->mst_mgr, &state->base,
 				 drm_atomic_get_mst_payload_state(mst_state, connector->port));
 
-	if (DISPLAY_VER(dev_priv) >= 14)
-		intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(trans),
-			     FECSTALL_DIS_DPTSTREAM_DPTTG,
-			     pipe_config->fec_enable ? FECSTALL_DIS_DPTSTREAM_DPTTG : 0);
-	else if (DISPLAY_VER(dev_priv) >= 12)
-		intel_de_rmw(dev_priv, CHICKEN_TRANS(trans),
+	if (DISPLAY_VER(dev_priv) >= 12)
+		intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, trans),
 			     FECSTALL_DIS_DPTSTREAM_DPTTG,
 			     pipe_config->fec_enable ? FECSTALL_DIS_DPTSTREAM_DPTTG : 0);
 

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

@@ -29,6 +29,7 @@
 #include "i915_reg.h"
 #include "intel_atomic.h"
 #include "intel_crtc.h"
+#include "intel_ddi.h"
 #include "intel_de.h"
 #include "intel_display_types.h"
 #include "intel_dp.h"
@@ -1452,12 +1453,10 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 		 * All supported adlp panels have 1-based X granularity, this may
 		 * cause issues if non-supported panels are used.
 		 */
-		if (IS_DISPLAY_IP_STEP(dev_priv, IP_VER(14, 0), STEP_A0, STEP_B0))
-			intel_de_rmw(dev_priv, MTL_CHICKEN_TRANS(cpu_transcoder), 0,
-				     ADLP_1_BASED_X_GRANULARITY);
-		else if (IS_ALDERLAKE_P(dev_priv))
-			intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder), 0,
-				     ADLP_1_BASED_X_GRANULARITY);
+		if (IS_DISPLAY_IP_STEP(dev_priv, IP_VER(14, 0), STEP_A0, STEP_B0) ||
+		    IS_ALDERLAKE_P(dev_priv))
+			intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, cpu_transcoder),
+				     0, ADLP_1_BASED_X_GRANULARITY);
 
 		/* Wa_16012604467:adlp,mtl[a0,b0] */
 		if (IS_DISPLAY_IP_STEP(dev_priv, IP_VER(14, 0), STEP_A0, STEP_B0))