[Intel-gfx] [PATCH 13/15] drm/i915/audio: Split "ELD valid" vs. audio PD on hsw+

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

On the older platforms the audio presence detect bit is in
the port register, so it gets written outside audio codec hooks
and is this separate from the ELD valid toggling. Split the
operations into two steps on hsw+ to be more consistent with
both the other platforms and the spec. Also according to the
spec we might need some vblank waits between the two which
definitely needs them done separately.

Cc: Chaitanya Kumar Borah <chaitanya.kumar.borah at intel.com>
Cc: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Cc: Takashi Iwai <tiwai at suse.de>
Reviewed-by: Jani Nikula <jani.nikula at intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_audio.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
index 9ba1351f2c6d..cbc5615f43bf 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.c
+++ b/drivers/gpu/drm/i915/display/intel_audio.c
@@ -481,9 +481,12 @@ static void hsw_audio_codec_disable(struct intel_encoder *encoder,
 		     (intel_crtc_has_dp_encoder(old_crtc_state) ?
 		      AUD_CONFIG_N_VALUE_INDEX : 0));
 
-	/* Disable audio presence detect, invalidate ELD */
+	/* Invalidate ELD */
+	intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD,
+		     AUDIO_ELD_VALID(cpu_transcoder), 0);
+
+	/* Disable audio presence detect */
 	intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD,
-		     AUDIO_ELD_VALID(cpu_transcoder) |
 		     AUDIO_OUTPUT_ENABLE(cpu_transcoder), 0);
 
 	mutex_unlock(&i915->display.audio.mutex);
@@ -614,10 +617,13 @@ static void hsw_audio_codec_enable(struct intel_encoder *encoder,
 	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP))
 		enable_audio_dsc_wa(encoder, crtc_state);
 
-	/* Enable audio presence detect, invalidate ELD */
+	/* Enable audio presence detect */
 	intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD,
-		     AUDIO_ELD_VALID(cpu_transcoder),
-		     AUDIO_OUTPUT_ENABLE(cpu_transcoder));
+		     0, AUDIO_OUTPUT_ENABLE(cpu_transcoder));
+
+	/* Invalidate ELD */
+	intel_de_rmw(i915, HSW_AUD_PIN_ELD_CP_VLD,
+		     AUDIO_ELD_VALID(cpu_transcoder), 0);
 
 	/*
 	 * FIXME: We're supposed to wait for vblank here, but we have vblanks
-- 
2.37.4