drm/i915: Move LPT PCH readout code

Nuke the hsw_get_ddi_port_state() eyesore by putting the
readout code into intel_pch_display.c, and calling it directly
from hsw_crt_get_config().

Note that the nuked TRANS_DDI_FUNC_CTL readout from
hsw_get_ddi_port_state() is now etirely redundant since we
get called from the encoder->get_config() so we already know
we're dealing with the correct DDI port. Previously the
code was called from a place where that wasn't known so
it had to checked manually.

v2: Clarify the TRANS_DDI_FUNC_CTL change (Dave)
    Nuke the now unused *TRANS_DDI_FUNC_CTL_VAL_TO_PORT() (Dave)

Cc: Dave Airlie <airlied@redhat.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018153525.21597-1-ville.syrjala@linux.intel.comReviewed-by: Dave Airlie <airlied@redhat.com>

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

@@ -147,6 +147,8 @@ static void hsw_crt_get_config(struct intel_encoder *encoder,
 {
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 
+	lpt_pch_get_config(pipe_config);
+
 	hsw_ddi_get_config(encoder, pipe_config);
 
 	pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |

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

@@ -4088,7 +4088,7 @@ void intel_dp_get_m_n(struct intel_crtc *crtc,
 					     &pipe_config->dp_m2_n2);
 }
 
-static void ilk_get_fdi_m_n_config(struct intel_crtc *crtc,
+void ilk_get_fdi_m_n_config(struct intel_crtc *crtc,
 			    struct intel_crtc_state *pipe_config)
 {
 	intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
@@ -4484,45 +4484,6 @@ static bool bxt_get_dsi_transcoder_state(struct intel_crtc *crtc,
 	return transcoder_is_dsi(pipe_config->cpu_transcoder);
 }
 
-static void hsw_get_ddi_port_state(struct intel_crtc *crtc,
-				   struct intel_crtc_state *pipe_config)
-{
-	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	enum transcoder cpu_transcoder = pipe_config->cpu_transcoder;
-	enum port port;
-	u32 tmp;
-
-	if (transcoder_is_dsi(cpu_transcoder)) {
-		port = (cpu_transcoder == TRANSCODER_DSI_A) ?
-						PORT_A : PORT_B;
-	} else {
-		tmp = intel_de_read(dev_priv,
-				    TRANS_DDI_FUNC_CTL(cpu_transcoder));
-		if (!(tmp & TRANS_DDI_FUNC_ENABLE))
-			return;
-		if (DISPLAY_VER(dev_priv) >= 12)
-			port = TGL_TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
-		else
-			port = TRANS_DDI_FUNC_CTL_VAL_TO_PORT(tmp);
-	}
-
-	/*
-	 * Haswell has only FDI/PCH transcoder A. It is which is connected to
-	 * DDI E. So just check whether this pipe is wired to DDI E and whether
-	 * the PCH transcoder is on.
-	 */
-	if (DISPLAY_VER(dev_priv) < 9 &&
-	    (port == PORT_E) && intel_de_read(dev_priv, LPT_TRANSCONF) & TRANS_ENABLE) {
-		pipe_config->has_pch_encoder = true;
-
-		tmp = intel_de_read(dev_priv, FDI_RX_CTL(PIPE_A));
-		pipe_config->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
-					  FDI_DP_PORT_WIDTH_SHIFT) + 1;
-
-		ilk_get_fdi_m_n_config(crtc, pipe_config);
-	}
-}
-
 static bool hsw_get_pipe_config(struct intel_crtc *crtc,
 				struct intel_crtc_state *pipe_config)
 {
@@ -4561,7 +4522,6 @@ static bool hsw_get_pipe_config(struct intel_crtc *crtc,
 		pipe_config->quirks |= PIPE_CONFIG_QUIRK_BIGJOINER_SLAVE;
 	} else if (!transcoder_is_dsi(pipe_config->cpu_transcoder) ||
 		   DISPLAY_VER(dev_priv) >= 11) {
-		hsw_get_ddi_port_state(crtc, pipe_config);
 		intel_get_transcoder_timings(crtc, pipe_config);
 	}
 

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

@@ -584,6 +584,8 @@ void intel_dp_get_m_n(struct intel_crtc *crtc,
 		      struct intel_crtc_state *pipe_config);
 void intel_dp_set_m_n(const struct intel_crtc_state *crtc_state,
 		      enum link_m_n_set m_n);
+void ilk_get_fdi_m_n_config(struct intel_crtc *crtc,
+			    struct intel_crtc_state *pipe_config);
 int intel_dotclock_calculate(int link_freq, const struct intel_link_m_n *m_n);
 
 bool hsw_crtc_state_ips_capable(const struct intel_crtc_state *crtc_state);

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

@@ -366,3 +366,21 @@ void lpt_pch_enable(struct intel_atomic_state *state,
 
 	lpt_enable_pch_transcoder(dev_priv, cpu_transcoder);
 }
+
+void lpt_pch_get_config(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);
+	u32 tmp;
+
+	if ((intel_de_read(dev_priv, LPT_TRANSCONF) & TRANS_ENABLE) == 0)
+		return;
+
+	crtc_state->has_pch_encoder = true;
+
+	tmp = intel_de_read(dev_priv, FDI_RX_CTL(PIPE_A));
+	crtc_state->fdi_lanes = ((FDI_DP_PORT_WIDTH_MASK & tmp) >>
+				 FDI_DP_PORT_WIDTH_SHIFT) + 1;
+
+	ilk_get_fdi_m_n_config(crtc, crtc_state);
+}

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

@@ -18,5 +18,6 @@ void ilk_pch_enable(struct intel_atomic_state *state,
 void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv);
 void lpt_pch_enable(struct intel_atomic_state *state,
 		    struct intel_crtc *crtc);
+void lpt_pch_get_config(struct intel_crtc_state *crtc_state);
 
 #endif

drivers/gpu/drm/i915/i915_reg.h

@@ -10212,8 +10212,6 @@ enum skl_power_gate {
 #define  TGL_TRANS_DDI_PORT_MASK	(0xf << TGL_TRANS_DDI_PORT_SHIFT)
 #define  TRANS_DDI_SELECT_PORT(x)	((x) << TRANS_DDI_PORT_SHIFT)
 #define  TGL_TRANS_DDI_SELECT_PORT(x)	(((x) + 1) << TGL_TRANS_DDI_PORT_SHIFT)
-#define  TRANS_DDI_FUNC_CTL_VAL_TO_PORT(val)	 (((val) & TRANS_DDI_PORT_MASK) >> TRANS_DDI_PORT_SHIFT)
-#define  TGL_TRANS_DDI_FUNC_CTL_VAL_TO_PORT(val) ((((val) & TGL_TRANS_DDI_PORT_MASK) >> TGL_TRANS_DDI_PORT_SHIFT) - 1)
 #define  TRANS_DDI_MODE_SELECT_MASK	(7 << 24)
 #define  TRANS_DDI_MODE_SELECT_HDMI	(0 << 24)
 #define  TRANS_DDI_MODE_SELECT_DVI	(1 << 24)