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V4L/DVB (13331): mxl5005s: provide ability to override QAM gain for HVR-1600
The HVR-1600 doesn't use the standard mechanism for computing the gain when in QAM mode, instead always forcing it to be 0x02. Provide the ability to override the algorithm on a per-board basis. This change results in an improvement of 0.4-0.6 dB for QAM tuning. This work was sponsored by ONELAN Limited. Cc: Steven Toth <stoth@kernellabs.com> Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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3 changed files with 9 additions and 1 deletions
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@ -2789,7 +2789,10 @@ static u16 MXL_TuneRF(struct dvb_frontend *fe, u32 RF_Freq)
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/* add for 2.6.5 Special setting for QAM */
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/* add for 2.6.5 Special setting for QAM */
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if (state->Mod_Type == MXL_QAM) {
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if (state->Mod_Type == MXL_QAM) {
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if (state->RF_IN < 680000000)
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if (state->config->qam_gain != 0)
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status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN,
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state->config->qam_gain);
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else if (state->RF_IN < 680000000)
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status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN, 3);
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status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN, 3);
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else
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else
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status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN, 2);
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status += MXL_ControlWrite(fe, RFSYN_CHP_GAIN, 2);
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@ -108,6 +108,10 @@ struct mxl5005s_config {
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#define MXL_LOW_IF 1
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#define MXL_LOW_IF 1
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u8 if_mode;
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u8 if_mode;
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/* Some boards need to override the built-in logic for determining
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the gain when in QAM mode (the HVR-1600 is one such case) */
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u8 qam_gain;
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/* Stuff I don't know what to do with */
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/* Stuff I don't know what to do with */
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u8 AgcMasterByte;
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u8 AgcMasterByte;
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};
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};
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@ -61,6 +61,7 @@ static struct mxl5005s_config hauppauge_hvr1600_tuner = {
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.top = MXL5005S_TOP_25P2,
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.top = MXL5005S_TOP_25P2,
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.mod_mode = MXL_DIGITAL_MODE,
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.mod_mode = MXL_DIGITAL_MODE,
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.if_mode = MXL_ZERO_IF,
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.if_mode = MXL_ZERO_IF,
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.qam_gain = 0x02,
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.AgcMasterByte = 0x00,
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.AgcMasterByte = 0x00,
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};
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};
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