diff options
| author | Manu Abraham <abraham.manu@gmail.com> | 2010-02-13 17:06:14 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-05-18 00:46:51 -0300 |
| commit | c8382c8e3295a1c85975c1898410f4d103650e4a (patch) | |
| tree | add5d11bc6bc59b5919c6280963a2060b28bc52c /drivers/media/dvb/frontends/stv090x.c | |
| parent | 5817ea0c83665dbc117cb7ca637202da0fb1abce (diff) | |
V4L/DVB: stv090x: Add some notes about the internal tuner I/O control
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/frontends/stv090x.c')
| -rw-r--r-- | drivers/media/dvb/frontends/stv090x.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/stv090x.c b/drivers/media/dvb/frontends/stv090x.c index a461fdff2c9..425e7a43ae1 100644 --- a/drivers/media/dvb/frontends/stv090x.c +++ b/drivers/media/dvb/frontends/stv090x.c @@ -758,6 +758,15 @@ static int stv090x_i2c_gate_ctrl(struct stv090x_state *state, int enable) { u32 reg; + /* + * NOTE! A lock is used as a FSM to control the state in which + * access is serialized between two tuners on the same demod. + * This has nothing to do with a lock to protect a critical section + * which may in some other cases be confused with protecting I/O + * access to the demodulator gate. + * In case of any error, the lock is unlocked and exit within the + * relevant operations themselves. + */ if (enable) mutex_lock(&state->internal->tuner_lock); |