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[media] xc4000: handle dib0700 broken i2c stretching

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It was confirmed by DibCom that i2c stretching is broken in the i2c master
on the dib7700.  So we need to put a hack into the xc4000 driver to not
complain in certain very specific cases where we know i2c stretching occurs.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Devin Heitmueller 2009-10-04 23:09:18 -03:00 committed by Mauro Carvalho Chehab
parent 8583fc834e
commit 799ed11afe
1 changed files with 29 additions and 5 deletions
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34
drivers/media/common/tuners/xc4000.c
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@ -89,6 +89,7 @@ struct xc4000_priv {
struct firmware_properties cur_fw;
__u16 hwmodel;
__u16 hwvers;
u8 ignore_i2c_write_errors;
};
/* Misc Defines */
@ -255,8 +256,15 @@ static int xc_send_i2c_data(struct xc4000_priv *priv, u8 *buf, int len)
struct i2c_msg msg = { .addr = priv->i2c_props.addr,
.flags = 0, .buf = buf, .len = len };
if (i2c_transfer(priv->i2c_props.adap, &msg, 1) != 1) {
printk(KERN_ERR "xc4000: I2C write failed (len=%i)\n", len);
return XC_RESULT_I2C_WRITE_FAILURE;
if (priv->ignore_i2c_write_errors == 0) {
printk(KERN_ERR "xc4000: I2C write failed (len=%i)\n",
len);
if (len == 4) {
printk("bytes %02x %02x %02x %02x\n", buf[0],
buf[1], buf[2], buf[3]);
}
return XC_RESULT_I2C_WRITE_FAILURE;
}
}
return XC_RESULT_SUCCESS;
}
@ -371,10 +379,15 @@ static int xc_SetTVStandard(struct xc4000_priv *priv,
__func__,
XC4000_Standard[priv->video_standard].Name);
/* Don't complain when the request fails because of i2c stretching */
priv->ignore_i2c_write_errors = 1;
ret = xc_write_reg(priv, XREG_VIDEO_MODE, VideoMode);
if (ret == XC_RESULT_SUCCESS)
ret = xc_write_reg(priv, XREG_AUDIO_MODE, AudioMode);
priv->ignore_i2c_write_errors = 0;
return ret;
}
@ -506,10 +519,16 @@ static u16 WaitForLock(struct xc4000_priv *priv)
static int xc_tune_channel(struct xc4000_priv *priv, u32 freq_hz, int mode)
{
int found = 0;
int result = 0;
dprintk(1, "%s(%u)\n", __func__, freq_hz);
if (xc_set_RF_frequency(priv, freq_hz) != XC_RESULT_SUCCESS)
/* Don't complain when the request fails because of i2c stretching */
priv->ignore_i2c_write_errors = 1;
result = xc_set_RF_frequency(priv, freq_hz);
priv->ignore_i2c_write_errors = 0;
if (result != XC_RESULT_SUCCESS)
return 0;
if (mode == XC_TUNE_ANALOG) {
@ -721,8 +740,13 @@ static int load_firmware(struct dvb_frontend *fe, unsigned int type,
p = priv->firm[pos].ptr;
printk("firmware length = %d\n", priv->firm[pos].size);
/* Don't complain when the request fails because of i2c stretching */
priv->ignore_i2c_write_errors = 1;
rc = xc_load_i2c_sequence(fe, p);
priv->ignore_i2c_write_errors = 0;
return rc;
}
@ -954,7 +978,7 @@ static int check_firmware(struct dvb_frontend *fe, unsigned int type,
int rc = 0, is_retry = 0;
u16 version, hwmodel;
v4l2_std_id std0;
u8 hw_major, hw_minor, fw_major, fw_minor;
u8 hw_major, hw_minor, fw_major, fw_minor;
dprintk(1, "%s called\n", __func__);
@ -1071,7 +1095,7 @@ skip_std_specific:
check_device:
rc = xc4000_readreg(priv, XREG_PRODUCT_ID, &hwmodel);
if (xc_get_version(priv, &hw_major, &hw_minor, &fw_major,
if (xc_get_version(priv, &hw_major, &hw_minor, &fw_major,
&fw_minor) != XC_RESULT_SUCCESS) {
printk("Unable to read tuner registers.\n");
goto fail;