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Wed, 9 Dec 2020 01:47:06 +0000 Received: from CO1PR11MB5026.namprd11.prod.outlook.com ([fe80::4820:6e90:3d0e:3b5f]) by CO1PR11MB5026.namprd11.prod.outlook.com ([fe80::4820:6e90:3d0e:3b5f%4]) with mapi id 15.20.3632.018; Wed, 9 Dec 2020 01:47:06 +0000 From: "Sia, Jee Heng" To: Andy Shevchenko CC: "vkoul@kernel.org" , "Eugeniy.Paltsev@synopsys.com" , "robh+dt@kernel.org" , "dmaengine@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" Subject: RE: [PATCH v5 16/16] dmaengine: dw-axi-dmac: Virtually split the linked-list Thread-Topic: [PATCH v5 16/16] dmaengine: dw-axi-dmac: Virtually split the linked-list Thread-Index: AQHWwYJ+glIrRaUQ5Ui4w1NZjWNA3anuFftA Date: Wed, 9 Dec 2020 01:47:06 +0000 Message-ID: References: <20201123023452.7894-1-jee.heng.sia@intel.com> <20201123023452.7894-17-jee.heng.sia@intel.com> <20201123102256.GV4077@smile.fi.intel.com> In-Reply-To: <20201123102256.GV4077@smile.fi.intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 authentication-results: linux.intel.com; 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x-ms-exchange-antispam-messagedata: =?us-ascii?Q?UZv21fH2LR9azKAZgMFp3qW9k8eay3lG+DfQwe1x4+Rw3CnXq/M96boyUYsM?= =?us-ascii?Q?hx3bhhahCqFqueBaHl4SnzbXEGoGt7/Ui81h4rmge+LZrKHEEFky78/ScGL0?= =?us-ascii?Q?lpniPlHtE98zkrO5TtJSC1DF4kNoovafz+EHbH8iDGVGmY9rkKphkNba6x1y?= =?us-ascii?Q?ni+GiVPdBBRg8ZqQm/kT5XosMzF+QhZJ4vQ9ap4KkU+TDL+4LMCE9MM1l91n?= =?us-ascii?Q?E/G2+F8rm7lHu/A2QjJ1fUINb9KzDoBu9QGx51ypiFCxzGoN+psa81OLOCpC?= =?us-ascii?Q?gDW79/+TfkLcNwqhhOum6MHTNqo/FjJJP1+FSEGn9AeBiIAy+z6SNG7OaPy6?= =?us-ascii?Q?KL7Hf5eYbO1JaViDV1i19CT+wDp34lfvpzhCGCJbLXhY+bpOOoADGJ8s9RqQ?= =?us-ascii?Q?jQtgq2sTc2xJojyvbaO4+E3S366nvsDPHtak+pU3AdScxm7WFtWn5+I15zpr?= =?us-ascii?Q?xxpQRD6cHe0HS1qu5A3rP/cFFTJ1QBAjFqQqEg/ZWdtDmk75MwsOn1kp+mEJ?= =?us-ascii?Q?kRDgFYcTPRrX0M+ib0Et51QrfAPXx0PT1tDBrIRn/yW0+rSj4sbWAkDldQv0?= =?us-ascii?Q?3YLdOpZNlGtsLJtWOhfae+zeQEGN4kZwhe4A9qWqElBFITmLt8rtDlWl7nkc?= =?us-ascii?Q?t1cMI4F1NNCszXncMB0ag4gQKQ83YaT9JcgCwsLMm0oPM6bPMEWmp1l7P5qo?= =?us-ascii?Q?V6u7eSERKwDvrvGTUx+UIK+lydmrF+8ObYcTVcEpito3qK/e3xeEgD2vL25E?= =?us-ascii?Q?AVc2X2NOiwUZE9YJhKPP0o6QvYtLlA2/c3ZbO9Q/PXC62xFL6lk22mq/Db6T?= =?us-ascii?Q?a4kiE7XGLOL/0q7rwIQS/PcfRc78rjKkWQid6wJZ7kVZ1TunbaTZFBcvOLii?= =?us-ascii?Q?PU/9j2vQtEyaguh2BQTqQPhmVw/FfwRBQYAu3mIF3G8/m8Gx7a49A3eHyDJb?= =?us-ascii?Q?W1lrFy94Y1ALkyWtBbZVqjAbJ6dV/Rg00UvBFb6PabA=3D?= 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-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: CO1PR11MB5026.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 20525c49-5097-4c4a-7ad6-08d89be455d3 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Dec 2020 01:47:06.6731 (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: 7C9HyEF87MpewIpvc/hCkXf3uv48Ek5EnDkwvBbAQ79YcZUjI1kz3pqEQ7NW4p0jdYTXTSSWfb6Sp1p/frCumg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1101MB2159 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > -----Original Message----- > From: Andy Shevchenko > Sent: 23 November 2020 6:23 PM > To: Sia, Jee Heng > Cc: vkoul@kernel.org; Eugeniy.Paltsev@synopsys.com; > robh+dt@kernel.org; dmaengine@vger.kernel.org; linux- > kernel@vger.kernel.org; devicetree@vger.kernel.org > Subject: Re: [PATCH v5 16/16] dmaengine: dw-axi-dmac: Virtually split > the linked-list >=20 > On Mon, Nov 23, 2020 at 10:34:52AM +0800, Sia Jee Heng wrote: > > AxiDMA driver exposed the dma_set_max_seg_size() to the > DMAENGINE. > > It shall helps the DMA clients to create size-optimized linked-list > > for the controller. > > > > However, there are certain situations where DMA client might not be > > abled to benefit from the dma_get_max_seg_size() if the segment > size > > can't meet the nature of the DMA client's operation. > > > > In the case of ALSA operation, ALSA application and driver expecting > > to run in a period of larger than 10ms regardless of the bit depth. > > With this large period, there is a strong request to split the > > linked-list in the AxiDMA driver. >=20 > I'm wondering why ASoC generic code can't use DMA channel and > device capabilities and prepare SG list with all limitations taken into > account. [>>] There is no further comment to split the linked-list in DMA, I assume = we can proceed with this patch. [>>] The RFC patch is submitted at below link and you are in the thread. [>>] https://lore.kernel.org/alsa-devel/CO1PR11MB5026545F07968DBC5386CF45DA= CD0@CO1PR11MB5026.namprd11.prod.outlook.com/T/#u >=20 >=20 > -- > With Best Regards, > Andy Shevchenko >=20