summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i2c
diff options
context:
space:
mode:
authorRussell King <rmk+kernel@armlinux.org.uk>2016-10-23 13:32:43 +0300
committerRussell King <rmk+kernel@armlinux.org.uk>2016-11-18 03:00:40 +0300
commit319e658c78befa51557f4d18a4092a04984290d4 (patch)
treebc155a65a2afe31ed3558e49f7e33f332f3d2fa8 /drivers/gpu/drm/i2c
parent6d30c0f728cac32ce8bf3d48ef6df485e0c641f1 (diff)
downloadlinux-319e658c78befa51557f4d18a4092a04984290d4.tar.xz
drm/i2c: tda998x: avoid racy access to mode clock
Avoid a racy access to the mode clock by storing the current mode clock during a mode set under the audio mutex. This allows us to access it from the audio path in a safe way. 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>
Diffstat (limited to 'drivers/gpu/drm/i2c')
-rw-r--r--drivers/gpu/drm/i2c/tda998x_drv.c25
1 files changed, 11 insertions, 14 deletions
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 9184487b10ad..422d63d5fb75 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -47,6 +47,7 @@ struct tda998x_priv {
u8 vip_cntrl_0;
u8 vip_cntrl_1;
u8 vip_cntrl_2;
+ unsigned long tmds_clock;
struct tda998x_audio_params audio_params;
struct platform_device *audio_pdev;
@@ -713,8 +714,7 @@ static void tda998x_audio_mute(struct tda998x_priv *priv, bool on)
static int
tda998x_configure_audio(struct tda998x_priv *priv,
- struct tda998x_audio_params *params,
- unsigned mode_clock)
+ struct tda998x_audio_params *params)
{
u8 buf[6], clksel_aip, clksel_fs, cts_n, adiv;
u32 n;
@@ -771,7 +771,7 @@ tda998x_configure_audio(struct tda998x_priv *priv,
* assume 100MHz requires larger divider.
*/
adiv = AUDIO_DIV_SERCLK_8;
- if (mode_clock > 100000)
+ if (priv->tmds_clock > 100000)
adiv++; /* AUDIO_DIV_SERCLK_16 */
/* S/PDIF asks for a larger divider */
@@ -1064,6 +1064,10 @@ 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 */
if (priv->is_hdmi_sink) {
/* We need to turn HDMI HDCP stuff on to get audio through */
@@ -1074,13 +1078,11 @@ tda998x_encoder_mode_set(struct drm_encoder *encoder,
tda998x_write_avi(priv, adjusted_mode);
- mutex_lock(&priv->audio_mutex);
if (priv->audio_params.format != AFMT_UNUSED)
- tda998x_configure_audio(priv,
- &priv->audio_params,
- adjusted_mode->clock);
- mutex_unlock(&priv->audio_mutex);
+ tda998x_configure_audio(priv, &priv->audio_params);
}
+
+ mutex_unlock(&priv->audio_mutex);
}
static enum drm_connector_status
@@ -1226,9 +1228,6 @@ static int tda998x_audio_hw_params(struct device *dev, void *data,
.cea = params->cea,
};
- if (!priv->encoder.crtc)
- return -ENODEV;
-
memcpy(audio.status, params->iec.status,
min(sizeof(audio.status), sizeof(params->iec.status)));
@@ -1264,9 +1263,7 @@ static int tda998x_audio_hw_params(struct device *dev, void *data,
}
mutex_lock(&priv->audio_mutex);
- ret = tda998x_configure_audio(priv,
- &audio,
- priv->encoder.crtc->hwmode.clock);
+ ret = tda998x_configure_audio(priv, &audio);
if (ret == 0)
priv->audio_params = audio;