linux-kernel - RE: [PATCH] ALSA: pcm: fix incorrect hw

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Message-ID: <BN6PR1101MB21327687327440F1DB7CB75F97BD0@BN6PR1101MB2132.namprd11.prod.outlook.com>
Date:   Fri, 15 May 2020 09:04:15 +0000
From:   "Lu, Brent" <brent.lu@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "Jaroslav Kysela" <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Baolin Wang <baolin.wang@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Richard Fontana <rfontana@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        paulhsia <paulhsia@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ALSA: pcm: fix incorrect hw_base increase

> 
> Is this a bugfix needed for older kernels as well?  When did this issue show
> up?
> 
> thanks,
> 
> greg k-h

It happens when DMA stop moving data from host to DSP/DAI for a long time
(> half of buffer time). I know host driver should do something about it. But if
not, the HWSYNC will keep increasing the hw_base and hw_ptr and confuses
user space program.

Regards,
Brent