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rda5802: document some registers

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This information is available in the RDA5802N or RDA5807 datasheet. I suspect
that register SYSCONFIG6 is not actually used by the tuner. Based on an
obscure statement in the datasheet, I guess SYSCONFIG5 is a frequency in Khz
called freq_direct that offsets the lower band frequency (56/67 MHz) but
1) it is not enabled (FREQ_MODE=0) and 2) it is not clear if this offset is
really just to avoid interference (ie the RF and IF are simply shifted by this
amount) or an actual offset.

Change-Id: Ia469f5370aee7c8c3390324d0cef1193c64df755
This commit is contained in:
Amaury Pouly 2017-11-09 23:01:24 +01:00 • committed by Solomon Peachy
parent 977308c95c
commit d22bb548b2
1 changed files with 7 additions and 7 deletions
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14
firmware/drivers/tuner/rda5802.c
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@ -48,9 +48,9 @@
#define SYSCONFIG1 0x4
#define SYSCONFIG2 0x5
#define SYSCONFIG3 0x6
#define SYSCONFIG4 0x7 /* undocumented */
#define SYSCONFIG5 0x8 /* undocumented */
#define SYSCONFIG6 0x9 /* undocumented */
#define SYSCONFIG4 0x7
#define SYSCONFIG5 0x8
#define SYSCONFIG6 0x9 /* suspected not to exists */
#define READCHAN 0xA
#define STATUSRSSI 0xB
@ -81,7 +81,7 @@
/* SYSCONFIG1 (0x4) */
#define SYSCONFIG1_DE (0x1 << 11)
#define SYSCONFIG1_SOFTMUTE_EN (0x1 << 9)
#define SYSCONFIG1_SOFTMUTE_EN (0x1 << 9)
/* SYSCONFIG2 (0x5) */
#define SYSCONFIG2_VOLUME (0xF << 0)
@ -105,9 +105,9 @@ static uint16_t cache[16] = {
[SYSCONFIG1] = 0x0200, /* SYSCONFIG1_SOFTMUTE_EN */
[SYSCONFIG2] = 0x867F, /* INT_MODE (def), SEEKTH=1100b, LNA_PORT_SEL=LNAN,
LNA_ICSEL=3.0mA, VOLUME=max */
[SYSCONFIG3] = 0x8000, /* I2S slave mode */
[SYSCONFIG4] = 0x4712, /* undocumented, affects stereo blend */
[SYSCONFIG5] = 0x5EC6, /* undocumented */
[SYSCONFIG3] = 0x8000, /* RSVD */
[SYSCONFIG4] = 0x4712, /* TH_SOFRBLEND=34dB, 65M_50M MODE=65~76MHz, RSVD, SEEK_TH_OLD=4, SOFTBLEND_EN */
[SYSCONFIG5] = 0x5EC6, /* FREQ_DIRECT=24262kHz (unused) */
[SYSCONFIG6] = 0x0000 /* undocumented */
};