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drm/i2c: tda998x: avoid race when programming audio

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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 <tixy@linaro.org>
Acked-by: Jon Medhurst <tixy@linaro.org>
Tested-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King 2016-11-02 21:38:34 +00:00
parent 319e658c78
commit 2cae8e028e
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i2c/tda998x_drv.c
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@ -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 */