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drm: tda998x: Protect the page register 

As the HDMI registers of the TDA998x chips are accessed by pages,
the page register must be protected.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Jean-Francois Moine 2014-11-29 08:30:51 +01:00 committed by Russell King
parent f114040e3e
commit ed9a84262a
1 changed files with 20 additions and 5 deletions
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25
drivers/gpu/drm/i2c/tda998x_drv.c
View File

@ -32,6 +32,7 @@
struct tda998x_priv {
struct i2c_client *cec;
struct i2c_client *hdmi;
struct mutex mutex;
uint16_t rev;
uint8_t current_page;
int dpms;
@ -402,9 +403,10 @@ reg_read_range(struct tda998x_priv *priv, uint16_t reg, char *buf, int cnt)
uint8_t addr = REG2ADDR(reg);
int ret;
mutex_lock(&priv->mutex);
ret = set_page(priv, reg);
if (ret < 0)
return ret;
goto out;
ret = i2c_master_send(client, &addr, sizeof(addr));
if (ret < 0)
@ -414,10 +416,12 @@ reg_read_range(struct tda998x_priv *priv, uint16_t reg, char *buf, int cnt)
if (ret < 0)
goto fail;
return ret;
goto out;
fail:
dev_err(&client->dev, "Error %d reading from 0x%x\n", ret, reg);
out:
mutex_unlock(&priv->mutex);
return ret;
}
@ -431,13 +435,16 @@ reg_write_range(struct tda998x_priv *priv, uint16_t reg, uint8_t *p, int cnt)
buf[0] = REG2ADDR(reg);
memcpy(&buf[1], p, cnt);
mutex_lock(&priv->mutex);
ret = set_page(priv, reg);
if (ret < 0)
return;
goto out;
ret = i2c_master_send(client, buf, cnt + 1);
if (ret < 0)
dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
mutex_unlock(&priv->mutex);
}
static int
@ -459,13 +466,16 @@ reg_write(struct tda998x_priv *priv, uint16_t reg, uint8_t val)
uint8_t buf[] = {REG2ADDR(reg), val};
int ret;
mutex_lock(&priv->mutex);
ret = set_page(priv, reg);
if (ret < 0)
return;
goto out;
ret = i2c_master_send(client, buf, sizeof(buf));
if (ret < 0)
dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
mutex_unlock(&priv->mutex);
}
static void
@ -475,13 +485,16 @@ reg_write16(struct tda998x_priv *priv, uint16_t reg, uint16_t val)
uint8_t buf[] = {REG2ADDR(reg), val >> 8, val};
int ret;
mutex_lock(&priv->mutex);
ret = set_page(priv, reg);
if (ret < 0)
return;
goto out;
ret = i2c_master_send(client, buf, sizeof(buf));
if (ret < 0)
dev_err(&client->dev, "Error %d writing to 0x%x\n", ret, reg);
out:
mutex_unlock(&priv->mutex);
}
static void
@ -1268,6 +1281,8 @@ static int tda998x_create(struct i2c_client *client, struct tda998x_priv *priv)
priv->dpms = DRM_MODE_DPMS_OFF;
mutex_init(&priv->mutex); /* protect the page access */
/* wake up the device: */
cec_write(priv, REG_CEC_ENAMODS,
CEC_ENAMODS_EN_RXSENS | CEC_ENAMODS_EN_HDMI);