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

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Message-ID: <s5hbptrws77.wl%tiwai@suse.de>
Date:	Wed, 28 Jan 2009 13:06:20 +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 08:02:36 -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 for the patch.
We can go better further with this patch now :)

The logic is basically fine, but just a few comments...

> diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
> index 19d3391..69b3ed8 100644
> --- a/sound/pci/intel8x0.c
> +++ b/sound/pci/intel8x0.c
...
> +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;

I feel it isn't intuitive to return -EIO here.
It'd be more straightforward to call snd_intel8x0_ich_chip_reset()
from here?

	if (snd_pci_quirk_lookup(chip->pci, ich_chip_reset_mode))
		return snd_intl8x0_ich_chip_reset(chip);


> +	if (snd_intel8x0_ich_chip_cold_reset(chip) < 0)
> +		if ((err = snd_intel8x0_ich_chip_reset(chip)) < 0)
> +			return err;

Please make the change checkpatch-clean.

Could you fix and repost?


thanks,

Takashi
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