diff options
Diffstat (limited to 'drivers/media/video/cx88/cx88-tvaudio.c')
| -rw-r--r-- | drivers/media/video/cx88/cx88-tvaudio.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c index 1cc2d286a1cb..76e5c78d8ae4 100644 --- a/drivers/media/video/cx88/cx88-tvaudio.c +++ b/drivers/media/video/cx88/cx88-tvaudio.c @@ -36,7 +36,6 @@ */ #include <linux/module.h> -#include <linux/moduleparam.h> #include <linux/errno.h> #include <linux/freezer.h> #include <linux/kernel.h> @@ -62,6 +61,10 @@ static unsigned int always_analog = 0; module_param(always_analog,int,0644); MODULE_PARM_DESC(always_analog,"force analog audio out"); +static unsigned int radio_deemphasis = 0; +module_param(radio_deemphasis,int,0644); +MODULE_PARM_DESC(radio_deemphasis, "Radio deemphasis time constant, " + "0=None, 1=50us (elsewhere), 2=75us (USA)"); #define dprintk(fmt, arg...) if (audio_debug) \ printk(KERN_DEBUG "%s/0: " fmt, core->name , ## arg) @@ -140,7 +143,7 @@ static void set_audio_finish(struct cx88_core *core, u32 ctl) cx_write(AUD_RATE_THRES_DMD, 0x000000C0); cx88_start_audio_dma(core); - if (cx88_boards[core->board].mpeg & CX88_MPEG_BLACKBIRD) { + if (core->board.mpeg & CX88_MPEG_BLACKBIRD) { cx_write(AUD_I2SINPUTCNTL, 4); cx_write(AUD_BAUDRATE, 1); /* 'pass-thru mode': this enables the i2s output to the mpeg encoder */ @@ -149,7 +152,7 @@ static void set_audio_finish(struct cx88_core *core, u32 ctl) cx_write(AUD_I2SCNTL, 0); /* cx_write(AUD_APB_IN_RATE_ADJ, 0); */ } - if ((always_analog) || (!(cx88_boards[core->board].mpeg & CX88_MPEG_BLACKBIRD))) { + if ((always_analog) || (!(core->board.mpeg & CX88_MPEG_BLACKBIRD))) { ctl |= EN_DAC_ENABLE; cx_write(AUD_CTL, ctl); } @@ -678,6 +681,10 @@ static void set_audio_standard_FM(struct cx88_core *core, }; /* It is enough to leave default values? */ + /* No, it's not! The deemphasis registers are reset to the 75us + * values by default. Analyzing the spectrum of the decoded audio + * reveals that "no deemphasis" is the same as 75 us, while the 50 us + * setting results in less deemphasis. */ static const struct rlist fm_no_deemph[] = { {AUD_POLYPH80SCALEFAC, 0x0003}, @@ -688,6 +695,7 @@ static void set_audio_standard_FM(struct cx88_core *core, set_audio_start(core, SEL_FMRADIO); switch (deemph) { + default: case FM_NO_DEEMPH: set_audio_registers(core, fm_no_deemph); break; @@ -757,7 +765,7 @@ void cx88_set_tvaudio(struct cx88_core *core) set_audio_standard_EIAJ(core); break; case WW_FM: - set_audio_standard_FM(core, FM_NO_DEEMPH); + set_audio_standard_FM(core, radio_deemphasis); break; case WW_NONE: default: @@ -790,9 +798,9 @@ void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t) core->astat = reg; /* TODO - Reading from AUD_STATUS is not enough - for auto-detecting sap/dual-fm/nicam. - Add some code here later. + Reading from AUD_STATUS is not enough + for auto-detecting sap/dual-fm/nicam. + Add some code here later. */ return; |