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dkim=none (message not signed) header.d=none;dmarc=fail action=oreject header.from=opensource.cirrus.com; Received-SPF: Fail (protection.outlook.com: domain of opensource.cirrus.com does not designate 84.19.233.75 as permitted sender) receiver=protection.outlook.com; client-ip=84.19.233.75; helo=edirelay1.ad.cirrus.com; Received: from edirelay1.ad.cirrus.com (84.19.233.75) by BL6PEPF0001AB76.mail.protection.outlook.com (10.167.242.169) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9611.8 via Frontend Transport; Wed, 11 Feb 2026 10:41:31 +0000 Received: from ediswmail9.ad.cirrus.com (ediswmail9.ad.cirrus.com [198.61.86.93]) by edirelay1.ad.cirrus.com (Postfix) with ESMTPS id DDD2D40654A; Wed, 11 Feb 2026 10:41:30 +0000 (UTC) Received: from [198.90.208.24] (ediswws06.ad.cirrus.com [198.90.208.24]) by ediswmail9.ad.cirrus.com (Postfix) with ESMTPSA id CA990820259; Wed, 11 Feb 2026 10:41:30 +0000 (UTC) Message-ID: <286c2158-5f53-42a2-a04d-e9bed3e7acf0@opensource.cirrus.com> Date: Wed, 11 Feb 2026 10:41:30 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 RESEND] SoundWire: Allow Prepare command for Simplified_CP_SM To: Pierre-Louis Bossart , "Holalu Yogendra, Niranjan" , "linux-sound@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "yung-chuan.liao@linux.intel.com" Cc: "broonie@kernel.org" , "ckeepax@opensource.cirrus.com" , "shumingf@realtek.com" , "lgirdwood@gmail.com" , "ranjani.sridharan@linux.intel.com" , "cezary.rojewski@intel.com" , "peter.ujfalusi@linux.intel.com" , "kai.vehmanen@linux.intel.com" , "vkoul@kernel.org" , "Ding, Shenghao" , "Xu, Baojun" , "Kasargod, Sandeep" References: <20260209070905.10749-1-niranjan.hy@ti.com> <97872c17-73c9-4484-9f8e-373ed9a59a25@linux.dev> <87773927e37c4d70862c5f047431c7b0@ti.com> <5066fa12-3ac1-4619-8fbe-62d61f9d446c@opensource.cirrus.com> <5c8a4d68-0f43-40d1-971f-7d1f4f55eb5c@linux.dev> Content-Language: en-GB From: Richard Fitzgerald In-Reply-To: <5c8a4d68-0f43-40d1-971f-7d1f4f55eb5c@linux.dev> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: GEuzL6RQQyO7a93OQvwFmyJG6nKR6vauRqi4UfmkswPR9nTYYwctIxkedloNzhAudSj0vYOYlswzUI/ZXwrTh9lErtPHwAfrs0Hje4C8/edXBKPLk/bmwfEojopQfLBA0SgT7nxJKNM4hWzM6hm4LlQdAU6wXw55A2Bgc66kzn+1VozOqRsvJFXmKG9Pm74rPh3I6SaUhDd2+pf8s5PQ7EsU5UOFdZgXhv634o8gWFdmWIM1YDckWOzEqXdK0Vg6L9ognwa9DP4WOif1wk7KnUO026IjHV7KvOwCHU7CT6dRwEKjOtqZwOGGBqDdGXxW85/dz1YtalE/spIx14vJlPRL6RQSJIb38ZxlHzzvhy+idSa1AAXoSYPXcm04CN6VSA3oBv9gl2tmt/kSdg8oRRRfk4jV9RF2HL6nuvWNwoMDoALfh2FpWvmMHAWdsNJv X-OriginatorOrg: opensource.cirrus.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Feb 2026 10:41:31.7358 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 260dafe8-4ea1-4615-f9f0-08de695a1ee3 X-MS-Exchange-CrossTenant-Id: bec09025-e5bc-40d1-a355-8e955c307de8 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=bec09025-e5bc-40d1-a355-8e955c307de8;Ip=[84.19.233.75];Helo=[edirelay1.ad.cirrus.com] X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: TreatMessagesAsInternal-BL6PEPF0001AB76.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA3PR19MB8664 X-Authority-Analysis: v=2.4 cv=YeOwJgRf c=1 sm=1 tr=0 ts=698c5cdf cx=c_pps a=xYKeb6kGun7gsC6lRUWGfA==:117 a=h1hSm8JtM9GN1ddwPAif2w==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s63m1ICgrNkA:10 a=RWc_ulEos4gA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=NEAV23lmAAAA:8 a=yd2tc_xMkHaqBMvAfikA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: hCCI-4_RbJdjfAw0N67wbdygD7pgeELU X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjExMDA4NyBTYWx0ZWRfXx1DDuQoZ27is BR68VejxlbmOcHHpSS83MTHCnfjufKU72uAk8R6KRhxPF+nAC43ArlHBTQHQ7b/omy3WhBtQMI9 s3lQOu2qg3vf36OJd++R/5aEdSSVR116tSAzFuBwdRdMkfyGRnbqHXedzMK+WLPhTpp49uXqyDc YjqFwfIBma96PopB12EHs52C+f/CqUqGMOn3NlcHupW3JTGSQ3tyVT/41vMgmneQgMSiOzoGS0d g2G1SPYJb1RmDAU93b1Wodlq2CXDIiRfvBgfajHDlcJWpw7pPeDg2+3q8kat9Y4L1tC4unnhnOp CVs305WzkWN/bWMVWbkc7Ar2LYN8QE4Y4p6nr89tyJGJDNmHsWkUNF8d8rzQzn1Y0P2wO39vRUD VL6Msana/QcRS2cPX47j8LYFEDvR235x2LPGnHNy4qGT+Lsk9Gjbw8k5bbOVDbiMO3N69seRUhy trXmiU8lNXyN8j87J8g== X-Proofpoint-GUID: hCCI-4_RbJdjfAw0N67wbdygD7pgeELU X-Proofpoint-Spam-Reason: safe On 10/02/2026 8:28 pm, Pierre-Louis Bossart wrote: > On 2/10/26 18:29, Richard Fitzgerald wrote: >> On 10/02/2026 5:04 pm, Pierre-Louis Bossart wrote: >>> On 2/10/26 12:08, Holalu Yogendra, Niranjan wrote: >>>>> On 2/9/26 20:13, Pierre-Louis Bossart wrote: >>>>> Subject: Re: [PATCH v1 RESEND] SoundWire: Allow Prepare >>>>> command for Simplified_CP_SM >>>>> >>>>> On 2/9/26 08: 09, Niranjan H Y wrote: >>>>>> In TI device implementations, we've found that some devices with >>>>>> Simplified_CP_SM still benefit from receiving the Prepare command. >>>>> It would also be good to clarify when the device is actually prepared after the >>>>> bits are set, if the implementation cannot guarantee that the prepared status is >>>>> reached by the end of the frame where the write occurs, then it's definitively >>>>> NOT a Simplified_CP_SM. >>>>> >>>>> What happens is the simple_ch_prep_sm bit is not set for those devices, and >>>>> the regular state machine is used instead? Is anything broken? >>>> >>>> We need to use the same BIOS between Windows and Linux. The BIOS configures >>>> the device as Simplified_CP_SM. The device also expects the Prepare bits to be >>>> set. If the device is configured as generic CP_SM, the status "Port Ready" >>>> bits will not be updated and we end up with port prepare fail errors. >>> >>> Are you referring to the DPN_IntStat::PortReady bit? IOW do the errors during prepare happen because the interrupt is not generated? >>> >>> If that is the case, then you should be aware of the thread "soundwire: stream: Prepare ports in parallel to reduce stream start latency", where it was agreed that the use of the PortReady interrupt is broken. We do need to move to a different code where we have a polling loop on the DPN_PrepareStatus::NotFinished bits. >> >> I made a patch to poll for DP prepare finished, instead of using the >> interrupt. I haven't sent that patch because this TI patch changes the >> same function. I was waiting for this one to be merged and then I would >> rebase onto that. >> >> Draft review of polled DP prepare: >> https://github.com/thesofproject/linux/pull/5649 > > IMHO it makes more sense to fix first a conceptual issue, and then add whatever is needed for a specific vendor. > The second part could be a quirk to use the regular state machine, or this additional write if that's not enough. > Ok. I'll watch this thread. Let me know if you want me to send my patch and TI rebase onto it. If I could get some confirmation on that draft Github pull that it doesn't break anything, that would be helpful.