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Commit 5a91206f authored by Maciej S. Szmigiero's avatar Maciej S. Szmigiero Committed by Mauro Carvalho Chehab
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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: default avatarMaciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 5fa88151

drivers/media/pci/saa7134/saa7134-i2c.c

+31 −0
Original line number Diff line number Diff line
@@ -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))) {