From 2cae8e028ecb44003f607584e014c15a2f415e8a Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 2 Nov 2016 21:38:34 +0000 Subject: [PATCH] drm/i2c: tda998x: avoid race when programming audio Avoid a race between programming audio and an in-progress mode set. A mode set is complex, and disables the ability to send infoframes to the sink, and is disruptive to audio - we have to mute the audio FIFO while doing a mode set. If an attempt is made to start up the audio side, we will undo the audio FIFO mute before the mode set has completed. Move the lock so that we prevent audio interfering with an in-progress mode set. Tested-by: Jon Medhurst Acked-by: Jon Medhurst Tested-by: Jyri Sarha Signed-off-by: Russell King --- drivers/gpu/drm/i2c/tda998x_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c index 422d63d..dd183ce 100644 --- a/drivers/gpu/drm/i2c/tda998x_drv.c +++ b/drivers/gpu/drm/i2c/tda998x_drv.c @@ -971,6 +971,8 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, div = 3; } + mutex_lock(&priv->audio_mutex); + /* mute the audio FIFO: */ reg_set(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_RST_FIFO); @@ -1064,8 +1066,6 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder, /* must be last register set: */ reg_write(priv, REG_TBG_CNTRL_0, 0); - mutex_lock(&priv->audio_mutex); - priv->tmds_clock = adjusted_mode->clock; /* Only setup the info frames if the sink is HDMI */ -- 2.7.4