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[media] saa7134: fix warm Medion 7134 EEPROM read 

When saa7134 module driving a Medion 7134 card is reloaded reads of this
card EEPROM (required for automatic detection of tuner model) will be
corrupted due to I2C gate in DVB-T demod being left closed.
This sometimes also happens on first saa7134 module load after a warm
reboot.

Fix this by opening this I2C gate before doing EEPROM read during i2c
initialization.

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Maciej S. Szmigiero 2016-07-02 20:27:46 -03:00 committed by Mauro Carvalho Chehab
parent 5fa88151ec
commit 5a91206ff0
1 changed files with 31 additions and 0 deletions
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31
drivers/media/pci/saa7134/saa7134-i2c.c
View File

@ -355,12 +355,43 @@ static struct i2c_client saa7134_client_template = {
/* ----------------------------------------------------------- */
/* On Medion 7134 reading EEPROM needs DVB-T demod i2c gate open */
static void saa7134_i2c_eeprom_md7134_gate(struct saa7134_dev *dev)
{
u8 subaddr = 0x7, dmdregval;
u8 data[2];
int ret;
struct i2c_msg i2cgatemsg_r[] = { {.addr = 0x08, .flags = 0,
.buf = &subaddr, .len = 1},
{.addr = 0x08,
.flags = I2C_M_RD,
.buf = &dmdregval, .len = 1}
};
struct i2c_msg i2cgatemsg_w[] = { {.addr = 0x08, .flags = 0,
.buf = data, .len = 2} };
ret = i2c_transfer(&dev->i2c_adap, i2cgatemsg_r, 2);
if ((ret == 2) && (dmdregval & 0x2)) {
pr_debug("%s: DVB-T demod i2c gate was left closed\n",
dev->name);
data[0] = subaddr;
data[1] = (dmdregval & ~0x2);
if (i2c_transfer(&dev->i2c_adap, i2cgatemsg_w, 1) != 1)
pr_err("%s: EEPROM i2c gate open failure\n",
dev->name);
}
}
static int
saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
{
unsigned char buf;
int i,err;
if (dev->board == SAA7134_BOARD_MD7134)
saa7134_i2c_eeprom_md7134_gate(dev);
dev->i2c_client.addr = 0xa0 >> 1;
buf = 0;
if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {