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Tue, 4 Aug 2020 04:33:31 +0000 From: "Lu, Brent" To: Takashi Iwai Subject: RE: [PATCH v3 2/2] ASoC: Intel: Add period size constraint on strago board Thread-Topic: [PATCH v3 2/2] ASoC: Intel: Add period size constraint on strago board Thread-Index: AQHWZzZzIgMFwAI7HkKT1/DPVspAl6khsDgAgAFDasCAAAm3gIADX8DAgAAlz4CAABcIUIAABbiAgACx9iA= Date: Tue, 4 Aug 2020 04:33:31 +0000 Message-ID: References: <1596020585-11517-1-git-send-email-brent.lu@intel.com> <1596198365-10105-1-git-send-email-brent.lu@intel.com> <1596198365-10105-3-git-send-email-brent.lu@intel.com> <63bca214-3434-16c6-1b60-adf323aec554@linux.intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.5.1.3 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: suse.de; dkim=none (message not signed) header.d=none;suse.de; dmarc=none action=none header.from=intel.com; x-originating-ip: [220.136.119.29] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b18be5fb-4a2d-4dda-db95-08d8382f8acf x-ms-traffictypediagnostic: DM6PR11MB3561: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7219; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR11MB3642.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b18be5fb-4a2d-4dda-db95-08d8382f8acf X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Aug 2020 04:33:31.4652 (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: YBH4EFAZuP30c2WlNZwnksGOUZw+20rEDvxzQehiE2geQtA3RoMUuVltTWOqWxSosgmFlhCCoGKRpLpIMjA/zw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB3561 X-OriginatorOrg: intel.com Cc: Guennadi Liakhovetski , "alsa-devel@alsa-project.org" , Kai Vehmanen , Kuninori Morimoto , "linux-kernel@vger.kernel.org" , "yuhsuan@google.com" , Takashi Iwai , Jie Yang , "Rojewski, Cezary" , Pierre-Louis Bossart , Liam Girdwood , Sam McNally , Mark Brown , Ranjani Sridharan , Daniel Stuart , Andy Shevchenko , Yu-Hsuan Hsu , Damian van Soelen X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" >=20 > For avoid further misunderstanding: it's fine that CRAS *uses* such a sho= rt > period. It's often required for achieving a short latency. >=20 > However, the question is whether the driver can set *only* this value for > making it working. IOW, if we don't have this constraint, what actually > happens? If the driver gives the period size alignment, wouldn't CRAS > choose 240? It won't. Without the constraint it becomes 432. Actually CRAS does not set period size specifically so the value depends on the constraint rules. [ 52.011146] sound pcmC1D0p: hw_param [ 52.011152] sound pcmC1D0p: ACCESS 0x1 [ 52.011155] sound pcmC1D0p: FORMAT 0x4 [ 52.011158] sound pcmC1D0p: SUBFORMAT 0x1 [ 52.011161] sound pcmC1D0p: SAMPLE_BITS [16:16] [ 52.011164] sound pcmC1D0p: FRAME_BITS [32:32] [ 52.011167] sound pcmC1D0p: CHANNELS [2:2] [ 52.011170] sound pcmC1D0p: RATE [48000:48000] [ 52.011173] sound pcmC1D0p: PERIOD_TIME [9000:9000] [ 52.011176] sound pcmC1D0p: PERIOD_SIZE [432:432] [ 52.011179] sound pcmC1D0p: PERIOD_BYTES [1728:1728] [ 52.011182] sound pcmC1D0p: PERIODS [474:474] [ 52.011185] sound pcmC1D0p: BUFFER_TIME [4266000:4266000] [ 52.011188] sound pcmC1D0p: BUFFER_SIZE [204768:204768] [ 52.011191] sound pcmC1D0p: BUFFER_BYTES [819072:819072] [ 52.011194] sound pcmC1D0p: TICK_TIME [0:0] Regards, Brent >=20 >=20 > Takashi