drm/i915/audio: fix compressed_bpp check

The early check for compressed_bpp being zero is too early, as it is hit
also when DSC is not enabled. Move the checks down to where the values
are actually needed. This is a paranoid check for a situation that
should not happen, so we don't really care about handling it gracefully
apart from not oopsing.

Fixes: 48b8b04c ("drm/i915/display: Enable DP Display Audio WA")
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1750
Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Cc: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200420131632.23283-1-jani.nikula@intel.com

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

@@ -542,6 +542,10 @@ static unsigned int get_hblank_early_enable_config(struct intel_encoder *encoder
 		    h_active, crtc_state->port_clock, crtc_state->lane_count,
 		    vdsc_bpp, cdclk);
 
+	if (WARN_ON(!crtc_state->port_clock || !crtc_state->lane_count ||
+		    !crtc_state->dsc.compressed_bpp || !i915->cdclk.hw.cdclk))
+		return 0;
+
 	link_clks_available = ((((h_total - h_active) *
 			       ((crtc_state->port_clock * ROUNDING_FACTOR) /
 				pixel_clk)) / ROUNDING_FACTOR) - 28);
@@ -597,21 +601,12 @@ static void enable_audio_dsc_wa(struct intel_encoder *encoder,
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	enum pipe pipe = crtc->pipe;
-	unsigned int hblank_early_prog, samples_room, h_active;
+	unsigned int hblank_early_prog, samples_room;
 	unsigned int val;
 
 	if (INTEL_GEN(i915) < 11)
 		return;
 
-	h_active = crtc_state->hw.adjusted_mode.hdisplay;
-
-	if (!(h_active && crtc_state->port_clock && crtc_state->lane_count &&
-	      crtc_state->dsc.compressed_bpp && i915->cdclk.hw.cdclk)) {
-		drm_err(&i915->drm, "Null Params rcvd for hblank early enabling\n");
-		WARN_ON(1);
-		return;
-	}
-
 	val = intel_de_read(i915, AUD_CONFIG_BE);
 
 	if (INTEL_GEN(i915) == 11)