From c1849372a68145b277c917fb5db8fb3f0a50e11e Mon Sep 17 00:00:00 2001 From: "Maciej S. Szmigiero" Date: Tue, 20 Aug 2019 19:05:54 -0300 Subject: [PATCH] media: saa7134: keep demod i2c gate closed on Medion 7134 Medion 7134 has two i2c eeproms on the same i2c bus sharing the same bus addresses: the first one for SAA7134 chip config and the second one behind TDA10046 DVB-T demod chip i2c gate storing its firmware. The TV tuner on this board is not behind this i2c gate. Due to the bus conflict described above, the card PCI SVID / SSID sometimes gets garbled after a reboot, which makes it necessary to specify the card model manually as an insmod option in order for it to be detected reliably. To avoid this, let's just leave the gate permanently closed so the eeprom chips won't clash. The demod firmware load is done with its i2c gate closed anyway so it is not affected by this change. Signed-off-by: Maciej S. Szmigiero Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/pci/saa7134/saa7134-dvb.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/media/pci/saa7134/saa7134-dvb.c b/drivers/media/pci/saa7134/saa7134-dvb.c index eb8377a..f359cd5 100644 --- a/drivers/media/pci/saa7134/saa7134-dvb.c +++ b/drivers/media/pci/saa7134/saa7134-dvb.c @@ -1264,6 +1264,20 @@ static int dvb_init(struct saa7134_dev *dev) &medion_cardbus, &dev->i2c_adap); if (fe0->dvb.frontend) { + /* + * The TV tuner on this board is actually NOT + * behind the demod i2c gate. + * However, the demod EEPROM is indeed there and it + * conflicts with the SAA7134 chip config EEPROM + * if the i2c gate is open (since they have same + * bus addresses) resulting in card PCI SVID / SSID + * being garbage after a reboot from time to time. + * + * Let's just leave the gate permanently closed - + * saa7134_i2c_eeprom_md7134_gate() will close it for + * us at probe time if it was open for some reason. + */ + fe0->dvb.frontend->ops.i2c_gate_ctrl = NULL; dvb_attach(simple_tuner_attach, fe0->dvb.frontend, &dev->i2c_adap, medion_cardbus.tuner_address, TUNER_PHILIPS_FMD1216ME_MK3); -- 2.7.4