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Fri, 15 May 2020 09:04:16 +0000 From: "Lu, Brent" To: Greg Kroah-Hartman CC: "alsa-devel@alsa-project.org" , "Jaroslav Kysela" , Takashi Iwai , Baolin Wang , Arnd Bergmann , Richard Fontana , Thomas Gleixner , paulhsia , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH] ALSA: pcm: fix incorrect hw_base increase Thread-Topic: [PATCH] ALSA: pcm: fix incorrect hw_base increase Thread-Index: AQHWKm+bGJ7M/VYc4UytQzlLp6XFraiouVwAgAAfc8A= Date: Fri, 15 May 2020 09:04:15 +0000 Message-ID: References: <1589515779-20987-1-git-send-email-brent.lu@intel.com> <20200515070446.GA1226131@kroah.com> In-Reply-To: <20200515070446.GA1226131@kroah.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.2.0.6 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: linuxfoundation.org; dkim=none (message not signed) header.d=none;linuxfoundation.org; dmarc=none action=none header.from=intel.com; x-originating-ip: [1.164.110.62] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 94f696e1-0b2b-410d-6009-08d7f8aef1dd x-ms-traffictypediagnostic: BN6PR1101MB2147: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; 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x-ms-exchange-antispam-messagedata: bg8FhlfOu2UPD/y9ho7y6eewyP40nU60o1z7uYVdSwZbHMCEJGoKRPV4tdE5Vyo4yaJ1vxyXIP/JapXS356LH7PZrca52BNHwCbBID+QJyoQqmLw84NhVPZ59eRqQpn4WOReI7NYiaOP/SO1olC3rimgqgifgU7RY99hioIGa9T1XlXULZMjWCYivA+jZyMEoVazunPZa3aS4cqlTi9tvqS1fjLEaXEngUR3d53XjQYLsUY/L1vXyjYxyFg5KdGxQdKSHtnF3Ru2x/pgIv7kx6LdPne9HCkTgoPrdNYm1hekqBIxe1MZOzOe0rY+nfbOTHrKGw9cMd6OFI7UdBqOkKs5MfJ29iBHfxWHj+c1zqdntM9u1+v6DIimfmpDRwxCfsxwYFvV0B2akTkvIDOkGJV1PQnw1X+/P6Skk3pPcNDryzz33TPSihmjyQTifIW/vusa+fvqNeazK+7I9w2SE5chxeYKIhPd39XUUs/ccDk= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 94f696e1-0b2b-410d-6009-08d7f8aef1dd X-MS-Exchange-CrossTenant-originalarrivaltime: 15 May 2020 09:04:16.0420 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 7kU9Fk+jMguDL7aR0SRVu5UJVuK1HLGRZdLhZtwgTfjCQhZ2w8fW1uda1feyxQUTSzZ4Ei7FanMyvrCDcn/Z5A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR1101MB2147 X-OriginatorOrg: intel.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >=20 > Is this a bugfix needed for older kernels as well? When did this issue s= how > up? >=20 > thanks, >=20 > 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. B= ut if not, the HWSYNC will keep increasing the hw_base and hw_ptr and confuses user space program. Regards, Brent