[PATCH 2/2] drm/bridge: it6505: Don't reject audio hw_params without an encoder

[Daniel Golle]

it6505_audio_setup_hw_params() returns -ENODEV when the bridge is not
attached to a DRM encoder. Now that it6505 registers an hdmi-audio-codec,
this callback runs whenever a stream is configured on the I2S DAI it is
wired to, including when that DAI is shared with another codec. On
mt8186-corsola the speaker amplifier (rt1019) and it6505 share I2S3, so
when the it6505 DP output has no display attached (bridge.encoder is
NULL) the -ENODEV propagates up through dpcm_be_dai_hw_params() and tears
down the whole backend, breaking speaker playback.

A codec must not fail hw_params on a shared DAI just because its own sink
is absent; the actual output is already gated by it6505->powered. Return
0 so the shared link can be configured.

Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 698ae01b3a47..e88960c82a23 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2979,7 +2979,7 @@ static int it6505_audio_setup_hw_params(struct it6505 *it6505,
 			     params->cea.channels);
 
 	if (!it6505->bridge.encoder)
-		return -ENODEV;
+		return 0;
 
 	if (params->cea.channels <= 1 || params->cea.channels > 8) {
 		DRM_DEV_DEBUG_DRIVER(dev, "channel number: %d not support",
-- 
2.55.0