Em Sun, 22 Dec 2013 15:17:46 +0100
Frank Schäfer <fschaefer....@googlemail.com> escreveu:
> The audio configuration in chip config register 0x00 and eeprom are always
> consistent. But currently the audio configuration #defines for the chip config
> register say 0x20 means 3 sample rates and 0x30 5 sample rates, while the
> eeprom
> info output says 0x20 means 1 sample rate and 0x30 3 sample rates.
>
> I've checked the datasheet excerpts I have and it seems that the meaning of
> these bits is different for em2820/40 (1 and 3 sample rates) and em2860+
> (3 and 5 smaple rates).
> I have also checked my Hauppauge WinTV USB 2 (em2840) and the chip/eeprom
> audio config 0x20 matches the sample rates reproted by the USB device
> descriptor (32k only).
>
> Signed-off-by: Frank Schäfer <fschaefer....@googlemail.com>
> ---
> drivers/media/usb/em28xx/em28xx-core.c | 24 +++++++++++++-----------
> drivers/media/usb/em28xx/em28xx-i2c.c | 10 ++++++++--
> drivers/media/usb/em28xx/em28xx-reg.h | 10 ++++++----
> drivers/media/usb/em28xx/em28xx.h | 3 +--
> 4 Dateien geändert, 28 Zeilen hinzugefügt(+), 19 Zeilen entfernt(-)
>
> diff --git a/drivers/media/usb/em28xx/em28xx-core.c
> b/drivers/media/usb/em28xx/em28xx-core.c
> index f6076a5..192b657 100644
> --- a/drivers/media/usb/em28xx/em28xx-core.c
> +++ b/drivers/media/usb/em28xx/em28xx-core.c
> @@ -525,17 +525,19 @@ int em28xx_audio_setup(struct em28xx *dev)
> dev->has_alsa_audio = false;
> dev->audio_mode.has_audio = false;
> return 0;
> - } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
> - EM28XX_CHIPCFG_I2S_3_SAMPRATES) {
> - em28xx_info("I2S Audio (3 sample rates)\n");
> - dev->audio_mode.i2s_3rates = 1;
> - } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
> - EM28XX_CHIPCFG_I2S_5_SAMPRATES) {
> - em28xx_info("I2S Audio (5 sample rates)\n");
> - dev->audio_mode.i2s_5rates = 1;
> - }
> -
> - if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
> + } else if ((cfg & EM28XX_CHIPCFG_AUDIOMASK) != EM28XX_CHIPCFG_AC97) {
> + if (dev->chip_id < CHIP_ID_EM2860 &&
> + (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
> + EM2820_CHIPCFG_I2S_1_SAMPRATE)
> + dev->audio_mode.i2s_samplerates = 1;
No need to store it at all, as, at least currently, this is not used
anywhere.
This patch could be useful if we could use this to improve em28xx-audio.c.
Otherwise, I would just drop the code that checks it, eventually
just keeping the registers at em28xx-reg.h
> + else if (dev->chip_id >= CHIP_ID_EM2860 &&
> + (cfg & EM28XX_CHIPCFG_AUDIOMASK) ==
> + EM2860_CHIPCFG_I2S_5_SAMPRATES)
> + dev->audio_mode.i2s_samplerates = 5;
> + else
> + dev->audio_mode.i2s_samplerates = 3;
> + em28xx_info("I2S Audio (%d sample rate(s))\n",
> + dev->audio_mode.i2s_samplerates);
> /* Skip the code that does AC97 vendor detection */
> dev->audio_mode.ac97 = EM28XX_NO_AC97;
> goto init_audio;
> diff --git a/drivers/media/usb/em28xx/em28xx-i2c.c
> b/drivers/media/usb/em28xx/em28xx-i2c.c
> index c4ff973..f2d5f8a 100644
> --- a/drivers/media/usb/em28xx/em28xx-i2c.c
> +++ b/drivers/media/usb/em28xx/em28xx-i2c.c
> @@ -736,10 +736,16 @@ static int em28xx_i2c_eeprom(struct em28xx *dev,
> unsigned bus,
> em28xx_info("\tAC97 audio (5 sample rates)\n");
> break;
> case 2:
> - em28xx_info("\tI2S audio, sample rate=32k\n");
> + if (dev->chip_id < CHIP_ID_EM2860)
> + em28xx_info("\tI2S audio, sample rate=32k\n");
> + else
> + em28xx_info("\tI2S audio, 3 sample rates\n");
> break;
> case 3:
> - em28xx_info("\tI2S audio, 3 sample rates\n");
> + if (dev->chip_id < CHIP_ID_EM2860)
> + em28xx_info("\tI2S audio, 3 sample rates\n");
> + else
> + em28xx_info("\tI2S audio, 5 sample rates\n");
> break;
> }
>
> diff --git a/drivers/media/usb/em28xx/em28xx-reg.h
> b/drivers/media/usb/em28xx/em28xx-reg.h
> index b769ceb..311fb34 100644
> --- a/drivers/media/usb/em28xx/em28xx-reg.h
> +++ b/drivers/media/usb/em28xx/em28xx-reg.h
> @@ -25,10 +25,12 @@
> #define EM28XX_R00_CHIPCFG 0x00
>
> /* em28xx Chip Configuration 0x00 */
> -#define EM28XX_CHIPCFG_VENDOR_AUDIO 0x80
> -#define EM28XX_CHIPCFG_I2S_VOLUME_CAPABLE 0x40
> -#define EM28XX_CHIPCFG_I2S_5_SAMPRATES 0x30
> -#define EM28XX_CHIPCFG_I2S_3_SAMPRATES 0x20
> +#define EM2860_CHIPCFG_VENDOR_AUDIO 0x80
> +#define EM2860_CHIPCFG_I2S_VOLUME_CAPABLE 0x40
> +#define EM2820_CHIPCFG_I2S_3_SAMPRATES 0x30
> +#define EM2860_CHIPCFG_I2S_5_SAMPRATES 0x30
> +#define EM2820_CHIPCFG_I2S_1_SAMPRATE 0x20
> +#define EM2860_CHIPCFG_I2S_3_SAMPRATES 0x20
> #define EM28XX_CHIPCFG_AC97 0x10
> #define EM28XX_CHIPCFG_AUDIOMASK 0x30
>
> diff --git a/drivers/media/usb/em28xx/em28xx.h
> b/drivers/media/usb/em28xx/em28xx.h
> index 191ef35..4d8c7d2 100644
> --- a/drivers/media/usb/em28xx/em28xx.h
> +++ b/drivers/media/usb/em28xx/em28xx.h
> @@ -292,8 +292,7 @@ struct em28xx_audio_mode {
>
> unsigned int has_audio:1;
>
> - unsigned int i2s_3rates:1;
> - unsigned int i2s_5rates:1;
> + u8 i2s_samplerates;
> };
>
> /* em28xx has two audio inputs: tuner and line in.
--
Cheers,
Mauro
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