drm/i915: Make CHICKEN_TRANS reg not depend on enum value

Depending on the transcoder enum values to translate from transcoder to
the corresponding CHICKEN_TRANS register can easily break if we add a
new transcoder. Add an explicit mapping instead, by using helpers to
look up the register instance either by transcoder or port (since
unconveniently the registers have both port and transcoder specific
bits).

While at it also check for the correctness of GEN, port, transcoder. I
wasn't sure if psr2_enabled can only be set for GEN9+, but that seems to
be the case indeed (see setting of sink_psr2_support in
intel_psr_init_dpcd()).

v2 (Ville):
- Make gen9_chicken_trans_reg() internal to intel_psr.c.
- s/trans/cpu_transcoder/

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181119180021.370-1-imre.deak@intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -7399,9 +7399,10 @@ enum {
 #define  BDW_DPRS_MASK_VBLANK_SRD	(1 << 0)
 #define CHICKEN_PIPESL_1(pipe) _MMIO_PIPE(pipe, _CHICKEN_PIPESL_1_A, _CHICKEN_PIPESL_1_B)
 
-#define CHICKEN_TRANS_A         0x420c0
-#define CHICKEN_TRANS_B         0x420c4
-#define CHICKEN_TRANS(trans) _MMIO_TRANS(trans, CHICKEN_TRANS_A, CHICKEN_TRANS_B)
+#define CHICKEN_TRANS_A		_MMIO(0x420c0)
+#define CHICKEN_TRANS_B		_MMIO(0x420c4)
+#define CHICKEN_TRANS_C		_MMIO(0x420c8)
+#define CHICKEN_TRANS_EDP	_MMIO(0x420cc)
 #define  VSC_DATA_SEL_SOFTWARE_CONTROL	(1 << 25) /* GLK and CNL+ */
 #define  DDI_TRAINING_OVERRIDE_ENABLE	(1 << 19)
 #define  DDI_TRAINING_OVERRIDE_VALUE	(1 << 18)

drivers/gpu/drm/i915/intel_ddi.c

@@ -3380,6 +3380,26 @@ static void intel_enable_ddi_dp(struct intel_encoder *encoder,
 		intel_audio_codec_enable(encoder, crtc_state, conn_state);
 }
 
+static i915_reg_t
+gen9_chicken_trans_reg_by_port(struct drm_i915_private *dev_priv,
+			       enum port port)
+{
+	static const i915_reg_t regs[] = {
+		[PORT_A] = CHICKEN_TRANS_EDP,
+		[PORT_B] = CHICKEN_TRANS_A,
+		[PORT_C] = CHICKEN_TRANS_B,
+		[PORT_D] = CHICKEN_TRANS_C,
+		[PORT_E] = CHICKEN_TRANS_A,
+	};
+
+	WARN_ON(INTEL_GEN(dev_priv) < 9);
+
+	if (WARN_ON(port < PORT_A || port > PORT_E))
+		port = PORT_A;
+
+	return regs[port];
+}
+
 static void intel_enable_ddi_hdmi(struct intel_encoder *encoder,
 				  const struct intel_crtc_state *crtc_state,
 				  const struct drm_connector_state *conn_state)
@@ -3403,17 +3423,10 @@ static void intel_enable_ddi_hdmi(struct intel_encoder *encoder,
 		 * the bits affect a specific DDI port rather than
 		 * a specific transcoder.
 		 */
-		static const enum transcoder port_to_transcoder[] = {
-			[PORT_A] = TRANSCODER_EDP,
-			[PORT_B] = TRANSCODER_A,
-			[PORT_C] = TRANSCODER_B,
-			[PORT_D] = TRANSCODER_C,
-			[PORT_E] = TRANSCODER_A,
-		};
-		enum transcoder transcoder = port_to_transcoder[port];
+		i915_reg_t reg = gen9_chicken_trans_reg_by_port(dev_priv, port);
 		u32 val;
 
-		val = I915_READ(CHICKEN_TRANS(transcoder));
+		val = I915_READ(reg);
 
 		if (port == PORT_E)
 			val |= DDIE_TRAINING_OVERRIDE_ENABLE |
@@ -3422,8 +3435,8 @@ static void intel_enable_ddi_hdmi(struct intel_encoder *encoder,
 			val |= DDI_TRAINING_OVERRIDE_ENABLE |
 				DDI_TRAINING_OVERRIDE_VALUE;
 
-		I915_WRITE(CHICKEN_TRANS(transcoder), val);
-		POSTING_READ(CHICKEN_TRANS(transcoder));
+		I915_WRITE(reg, val);
+		POSTING_READ(reg);
 
 		udelay(1);
 
@@ -3434,7 +3447,7 @@ static void intel_enable_ddi_hdmi(struct intel_encoder *encoder,
 			val &= ~(DDI_TRAINING_OVERRIDE_ENABLE |
 				 DDI_TRAINING_OVERRIDE_VALUE);
 
-		I915_WRITE(CHICKEN_TRANS(transcoder), val);
+		I915_WRITE(reg, val);
 	}
 
 	/* In HDMI/DVI mode, the port width, and swing/emphasis values

drivers/gpu/drm/i915/intel_psr.c

@@ -577,6 +577,25 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
 	dev_priv->psr.active = true;
 }
 
+static i915_reg_t gen9_chicken_trans_reg(struct drm_i915_private *dev_priv,
+					 enum transcoder cpu_transcoder)
+{
+	static const i915_reg_t regs[] = {
+		[TRANSCODER_A] = CHICKEN_TRANS_A,
+		[TRANSCODER_B] = CHICKEN_TRANS_B,
+		[TRANSCODER_C] = CHICKEN_TRANS_C,
+		[TRANSCODER_EDP] = CHICKEN_TRANS_EDP,
+	};
+
+	WARN_ON(INTEL_GEN(dev_priv) < 9);
+
+	if (WARN_ON(cpu_transcoder >= ARRAY_SIZE(regs) ||
+		    !regs[cpu_transcoder].reg))
+		cpu_transcoder = TRANSCODER_A;
+
+	return regs[cpu_transcoder];
+}
+
 static void intel_psr_enable_source(struct intel_dp *intel_dp,
 				    const struct intel_crtc_state *crtc_state)
 {
@@ -591,7 +610,9 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 		hsw_psr_setup_aux(intel_dp);
 
 	if (dev_priv->psr.psr2_enabled) {
-		u32 chicken = I915_READ(CHICKEN_TRANS(cpu_transcoder));
+		i915_reg_t reg = gen9_chicken_trans_reg(dev_priv,
+							cpu_transcoder);
+		u32 chicken = I915_READ(reg);
 
 		if (IS_GEN9(dev_priv) && !IS_GEMINILAKE(dev_priv))
 			chicken |= (PSR2_VSC_ENABLE_PROG_HEADER
@@ -599,7 +620,7 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 
 		else
 			chicken &= ~VSC_DATA_SEL_SOFTWARE_CONTROL;
-		I915_WRITE(CHICKEN_TRANS(cpu_transcoder), chicken);
+		I915_WRITE(reg, chicken);
 	}
 
 	/*