linux-kernel - Re: [PATCH] ALSA: Don't cold reset AC97 codecs in some ICH chipsets

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Date:	Wed, 28 Jan 2009 16:20:12 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: Don't cold reset AC97 codecs in some ICH chipsets

At Wed, 28 Jan 2009 12:40:42 -0200,
Thadeu Lima de Souza Cascardo wrote:
> 
> Check in a quirk list if it should do cold reset when AC97 power saving
> is enabled. Some devices do not resume properly when cold reset,
> although power saving works OK.
> 
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>

Thanks, applied now.

... and soon I found a build error when CONFIG_SND_AC97_POWERSAVE=n.
Fixed, too :)


Takashi

> ---
>  sound/pci/intel8x0.c |   68 ++++++++++++++++++++++++++++++++++++++-----------
>  1 files changed, 52 insertions(+), 16 deletions(-)
> 
> diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
> index 19d3391..b37bd26 100644
> --- a/sound/pci/intel8x0.c
> +++ b/sound/pci/intel8x0.c
> @@ -2287,23 +2287,23 @@ static void do_ali_reset(struct intel8x0 *chip)
>  	iputdword(chip, ICHREG(ALI_INTERRUPTSR), 0x00000000);
>  }
>  
> -static int snd_intel8x0_ich_chip_init(struct intel8x0 *chip, int probing)
> -{
> -	unsigned long end_time;
> -	unsigned int cnt, status, nstatus;
> -	
> -	/* put logic to right state */
> -	/* first clear status bits */
> -	status = ICH_RCS | ICH_MCINT | ICH_POINT | ICH_PIINT;
> -	if (chip->device_type == DEVICE_NFORCE)
> -		status |= ICH_NVSPINT;
> -	cnt = igetdword(chip, ICHREG(GLOB_STA));
> -	iputdword(chip, ICHREG(GLOB_STA), cnt & status);
> +#ifdef CONFIG_SND_AC97_POWER_SAVE
> +static struct snd_pci_quirk ich_chip_reset_mode[] = {
> +	SND_PCI_QUIRK(0x1014, 0x051f, "Thinkpad R32", 1),
> +	{ } /* end */
> +};
>  
> +static int snd_intel8x0_ich_chip_cold_reset(struct intel8x0 *chip)
> +{
> +	unsigned int cnt;
>  	/* ACLink on, 2 channels */
> +
> +	if (snd_pci_quirk_lookup(chip->pci, ich_chip_reset_mode))
> +		return -EIO;
> +
>  	cnt = igetdword(chip, ICHREG(GLOB_CNT));
>  	cnt &= ~(ICH_ACLINK | ICH_PCM_246_MASK);
> -#ifdef CONFIG_SND_AC97_POWER_SAVE
> +
>  	/* do cold reset - the full ac97 powerdown may leave the controller
>  	 * in a warm state but actually it cannot communicate with the codec.
>  	 */
> @@ -2312,22 +2312,58 @@ static int snd_intel8x0_ich_chip_init(struct intel8x0 *chip, int probing)
>  	udelay(10);
>  	iputdword(chip, ICHREG(GLOB_CNT), cnt | ICH_AC97COLD);
>  	msleep(1);
> +	return 0;
> +}
> +#define snd_intel8x0_ich_chip_can_cold_reset(chip) \
> +	(!snd_pci_quirk_lookup(chip->pci, ich_chip_reset_mode))
>  #else
> +#define snd_intel8x0_ich_chip_cold_reset(x) do { } while (0)
> +#define snd_intel8x0_ich_chip_can_cold_reset(chip) (0)
> +#endif
> +
> +static int snd_intel8x0_ich_chip_reset(struct intel8x0 *chip)
> +{
> +	unsigned long end_time;
> +	unsigned int cnt;
> +	/* ACLink on, 2 channels */
> +	cnt = igetdword(chip, ICHREG(GLOB_CNT));
> +	cnt &= ~(ICH_ACLINK | ICH_PCM_246_MASK);
>  	/* finish cold or do warm reset */
>  	cnt |= (cnt & ICH_AC97COLD) == 0 ? ICH_AC97COLD : ICH_AC97WARM;
>  	iputdword(chip, ICHREG(GLOB_CNT), cnt);
>  	end_time = (jiffies + (HZ / 4)) + 1;
>  	do {
>  		if ((igetdword(chip, ICHREG(GLOB_CNT)) & ICH_AC97WARM) == 0)
> -			goto __ok;
> +			return 0;
>  		schedule_timeout_uninterruptible(1);
>  	} while (time_after_eq(end_time, jiffies));
>  	snd_printk(KERN_ERR "AC'97 warm reset still in progress? [0x%x]\n",
>  		   igetdword(chip, ICHREG(GLOB_CNT)));
>  	return -EIO;
> +}
> +
> +static int snd_intel8x0_ich_chip_init(struct intel8x0 *chip, int probing)
> +{
> +	unsigned long end_time;
> +	unsigned int status, nstatus;
> +	unsigned int cnt;
> +	int err;
> +
> +	/* put logic to right state */
> +	/* first clear status bits */
> +	status = ICH_RCS | ICH_MCINT | ICH_POINT | ICH_PIINT;
> +	if (chip->device_type == DEVICE_NFORCE)
> +		status |= ICH_NVSPINT;
> +	cnt = igetdword(chip, ICHREG(GLOB_STA));
> +	iputdword(chip, ICHREG(GLOB_STA), cnt & status);
> +
> +	if (snd_intel8x0_ich_chip_can_cold_reset(chip))
> +		err = snd_intel8x0_ich_chip_cold_reset(chip);
> +	else
> +		err = snd_intel8x0_ich_chip_reset(chip);
> +	if (err < 0)
> +		return err;
>  
> -      __ok:
> -#endif
>  	if (probing) {
>  		/* wait for any codec ready status.
>  		 * Once it becomes ready it should remain ready
> -- 
> 1.6.0.6
> 
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