linux-kernel - Re: [PATCH] ALSA: usb-audio: disable 96khz support for HUAWEI USB-C HEADSET

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Date:   Tue, 10 Nov 2020 09:12:28 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Macpaul Lin <macpaul.lin@...iatek.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alexander Tsoy <alexander@...y.me>,
        Nicola Lunghi <nick83ola@...il.com>,
        Christopher Swenson <swenson@...nson.io>,
        Nick Kossifidis <mickflemm@...il.com>,
        <alsa-devel@...a-project.org>, Ainge Hsu <ainge.hsu@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
        Macpaul Lin <macpaul@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] ALSA: usb-audio: disable 96khz support for HUAWEI USB-C HEADSET

On Tue, 10 Nov 2020 09:04:03 +0100,
Macpaul Lin wrote:
> 
> The HUAWEI USB-C headset (VID:0x12d1, PID:0x3a07) reported it supports
> 96khz. However there will be some random issue under 96khz.
> Not sure if there is any alternate setting could be applied.
> Hence 48khz is suggested to be applied at this moment.
> 
> Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
> Signed-off-by: Eddie Hung <eddie.hung@...iatek.com>
> ---
>  sound/usb/format.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/sound/usb/format.c b/sound/usb/format.c
> index 1b28d01..6f6e79b 100644
> --- a/sound/usb/format.c
> +++ b/sound/usb/format.c
> @@ -217,6 +217,11 @@ static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audiof
>  			    (chip->usb_id == USB_ID(0x041e, 0x4064) ||
>  			     chip->usb_id == USB_ID(0x041e, 0x4068)))
>  				rate = 8000;
> +			/* Huawei headset can't support 96kHz fully */
> +			if (rate == 96000 &&
> +			    chip->usb_id == USB_ID(0x12d1, 0x3a07) &&
> +			    le16_to_cpu(udev->descriptor.bcdDevice) == 0x49)

This causes the compile error due to the unknown udev.
Is this bcdDevice check mandatory?


thanks,

Takashi