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author | Manu Abraham <abraham.manu@gmail.com> | 2010-02-13 20:06:14 (GMT) |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-05-18 03:46:51 (GMT) |
commit | c8382c8e3295a1c85975c1898410f4d103650e4a (patch) | |
tree | add5d11bc6bc59b5919c6280963a2060b28bc52c | |
parent | 5817ea0c83665dbc117cb7ca637202da0fb1abce (diff) | |
download | linux-fsl-qoriq-c8382c8e3295a1c85975c1898410f4d103650e4a.tar.xz |
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>
-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 a461fdf..425e7a4 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); |