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>
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@ -758,6 +758,15 @@ static int stv090x_i2c_gate_ctrl(struct stv090x_state *state, int enable)
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{
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u32 reg;
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/*
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* NOTE! A lock is used as a FSM to control the state in which
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* access is serialized between two tuners on the same demod.
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* This has nothing to do with a lock to protect a critical section
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* which may in some other cases be confused with protecting I/O
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* access to the demodulator gate.
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* In case of any error, the lock is unlocked and exit within the
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* relevant operations themselves.
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*/
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if (enable)
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mutex_lock(&state->internal->tuner_lock);
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