diff options
| author | Brad Love <brad@nextdimension.cc> | 2019-11-14 21:03:57 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-04-21 16:45:44 +0200 |
| commit | e955f959ac52e145f27ff2be9078b646d0352af0 (patch) | |
| tree | 51ff37a74b6d562cabbac54d51842c5bf0b3934c /drivers/media/tuners | |
| parent | 5741f4affb694653c2cec3d75aa4dd56cae2175b (diff) | |
| download | linux-e955f959ac52e145f27ff2be9078b646d0352af0.tar.gz | |
media: si2157: Better check for running tuner in init
Getting the Xtal trim property to check if running is less error prone. Reset if_frequency if state is unknown. Replaces the previous "garbage check". Signed-off-by: Brad Love <brad@nextdimension.cc> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/tuners')
| -rw-r--r-- | drivers/media/tuners/si2157.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c index 69c625eaee25..e1e23e78fd19 100644 --- a/drivers/media/tuners/si2157.c +++ b/drivers/media/tuners/si2157.c @@ -81,24 +81,23 @@ static int si2157_init(struct dvb_frontend *fe) struct si2157_cmd cmd; const struct firmware *fw; const char *fw_name; - unsigned int uitmp, chip_id; + unsigned int chip_id, xtal_trim; dev_dbg(&client->dev, "\n"); - /* Returned IF frequency is garbage when firmware is not running */ - memcpy(cmd.args, "\x15\x00\x06\x07", 4); + /* Try to get Xtal trim property, to verify tuner still running */ + memcpy(cmd.args, "\x15\x00\x04\x02", 4); cmd.wlen = 4; cmd.rlen = 4; ret = si2157_cmd_execute(client, &cmd); - if (ret) - goto err; - uitmp = cmd.args[2] << 0 | cmd.args[3] << 8; - dev_dbg(&client->dev, "if_frequency kHz=%u\n", uitmp); + xtal_trim = cmd.args[2] | (cmd.args[3] << 8); - if (uitmp == dev->if_frequency / 1000) + if (ret == 0 && xtal_trim < 16) goto warm; + dev->if_frequency = 0; /* we no longer know current tuner state */ + /* power up */ if (dev->chiptype == SI2157_CHIPTYPE_SI2146) { memcpy(cmd.args, "\xc0\x05\x01\x00\x00\x0b\x00\x00\x01", 9); |