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| author | Maciej S. Szmigiero <mail@maciej.szmigiero.name> | 2016-07-03 02:27:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-15 12:57:50 +0300 |
| commit | 52b9815d37fca7d87fc1ff44b4916b4804c8383d (patch) | |
| tree | 96796e16c36fe2689a031312cb86559224ad1fab | |
| parent | 646b65808b0da1fb2f72daf4dabdd9bc8e398f49 (diff) | |
| download | linux-52b9815d37fca7d87fc1ff44b4916b4804c8383d.tar.xz | |
saa7134: fix warm Medion 7134 EEPROM read
commit 5a91206ff0d0548939f3e85a65fb76b400fb0e89 upstream.
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>
Cc: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/media/pci/saa7134/saa7134-i2c.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/media/pci/saa7134/saa7134-i2c.c b/drivers/media/pci/saa7134/saa7134-i2c.c index 8ef6399d794f..bc957528f69f 100644 --- a/drivers/media/pci/saa7134/saa7134-i2c.c +++ b/drivers/media/pci/saa7134/saa7134-i2c.c @@ -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))) { |