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Tue, 19 Aug 2025 06:59:56 +0000 Date: Tue, 19 Aug 2025 08:59:50 +0200 From: Alexander Wilhelm To: Baochen Qiang Cc: Jeff Johnson , ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: ath12k: REO status on PPC does not work Message-ID: References: Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/2.1.4 (2021-12-11) X-ClientProxiedBy: GV2PEPF00007572.SWEP280.PROD.OUTLOOK.COM (2603:10a6:158:401::3eb) To FRWP192MB2997.EURP192.PROD.OUTLOOK.COM (2603:10a6:d10:17c::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: FRWP192MB2997:EE_|AM7P192MB0578:EE_ X-MS-Office365-Filtering-Correlation-Id: 03810c6f-619a-49f0-c64f-08dddeee0187 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?utf-8?B?NXp4MHBEd1hVRlpUdVZmRFgxWVhjQmZQeUp5OGd2V2hTOWd2aElmcGtwS0Z6?= =?utf-8?B?TzFLb21hNzhhcXM5bGVodTJ6U3J0Qm9QancwRDA2eHhNYmZJSTZ5cjM2UzVZ?= =?utf-8?B?L20xYzREc0t0dGV5VUtHL05VQk80MDFwelFPUTdwdkhYd2JJdkpaNmlXREFw?= =?utf-8?B?RkN2YTNSckRxYXZGMkRYZW11dXpzZ3RpVG1rdnVWd2RIOFUvc3U5cDRiQnZ3?= =?utf-8?B?RFFXMzA2QWRtakhISElpYWx5R2RpR0VZYXhkT0x6cTltdWpsR2xwaW5XT0lv?= =?utf-8?B?OURuQjhKa2s4cTZtK3NwejM5Z2Vab2xiNHZIVThFQ1l0UnpyMkJ6UWpSbnAy?= =?utf-8?B?OVVrS2UxUnlmZS9Ga2ZXV2J3WHpMNEsvTGxLNTNkekMrK3lxOW9NZXQ0aUxS?= =?utf-8?B?cURZZXdWT0RFTUp2Z2t3NnM2NW5qWDBubFRRdTVxZUpzRjUxREtQVW9tMG5B?= =?utf-8?B?QWdHcU80TVlQMUlrU2RscVpnam5zZUxPN0FYUXBWTjdDaHZSMkJqendjUjEr?= =?utf-8?B?RnBXWU1WNnV5YjFrc2FQT0R4R2RqdzFsUHBQY0J4dENOcm52LzFtLzZKTUNy?= =?utf-8?B?eEcrTlBYc3YwUnZnWXErRDFyNERqblNnY0w5TGdabFBFbGdCdUZCSVFPTUZG?= =?utf-8?B?MVVjMldUczFMU3Z6ai9Eak90VFZLUmEwZ1ZTRWVtcnRIeEYwNVpYc3h2TUk0?= =?utf-8?B?ZjQ4WGhpeVpQeElQT0h3enFqcUlCSk5UMENEZ3d4cWFkNzlIWG9sOGtRN2pr?= =?utf-8?B?bHRNV3VWV3VSZnMxbEJsbGdMcWc0dGhqRE8wU21WZ3ROVXpRd3dYVVVXTjha?= =?utf-8?B?dk4vQnVwUkFqR256S0hRd3lCLzFyeXA4RkdwU3Vrb3RZZy90UEpFSWwreERK?= =?utf-8?B?SjdsZjErdUg3cXJOVGlUemYvWHJQYmFoN1pQRy94bkFqSzF2STluSzVWSWcx?= =?utf-8?B?cGxZdXRiZVdIamdrV0V5ZUpsTDdHLzB3anBWMUlrVFVxL0lXdnJ2SEtFQlpp?= =?utf-8?B?MW9SUlJqb0g3U2hvbjRsV09hMlFJM0dNZVM4aTFnd0J1MzJwRWxtUUJyK2to?= =?utf-8?B?QWEwZVBaeE1jNTVKTW5wdmpDUDRDR0J0ZVFSZ3VDT0d5VSs4OUttRlIrN3Zv?= =?utf-8?B?eFk1dkI4bWdsZnNCclBUQmZHdEVjd3l5enFYK3RqUmpUdFRlSW44d3JWQXhj?= =?utf-8?B?OUxxdExjbzBRZjAzK0xrWGRQcURSdEYzLzdodWFwRFVPVy9KZlFOdjF2dk8r?= =?utf-8?B?Z2pWcXdnZmg0SDBhUXg2aGV4YXp0aWVETFJUbXFDdDVjcTR1cnZ4QWx6dHdx?= =?utf-8?B?WGZkQWhXYlNCdWRwdjI2WnNsRkV5YWRrYW1RU09LMTlqYmxkcGNaaFFzcFYz?= =?utf-8?B?S1pBZnN1c2ZONzB4ZVJrdlE1eC9GWW5kQzlMYS9ZSndReGYwWmpzVStwaUZz?= =?utf-8?B?RnZwYnNKbDUyakM4VUc1QUJZSllSODRuMkZUWk1OeTU4L1Q3L2Rnc2c5eEZD?= =?utf-8?B?N3NSV0VaT1hqTlZTL002NExTKzkvb1pZR0p2OEl1VEp3Rlg4dzdrMldaeGps?= =?utf-8?B?OUppRDF2NGNudFNtWGE5OTgzb2VIayt6blZrOTFNdGVPT1YvV3E4THl1NWxN?= =?utf-8?B?K3FkdUw0YjBwYzVoRmpHUmI1emMwTFlWNUdzMjduZTdnc2ZmMVJtQkJQYTZO?= =?utf-8?B?K1hIR2lzaUNsd3pUcGRwbWRFWE5JMEtMWWpVN1BjVzdKRFFFaWE5aWgxZ3hq?= =?utf-8?B?V0hCM3M1NkhjNGkvZzR4b2Irc0FOZkNVSGNFWm5hc09wcXRsZ1Y2MTE5TnM3?= =?utf-8?B?NmlZMFJuTHJVRHRvRFc5NVhTeFNuOHlaZkRNQVN4YmJTWkFOR01FMTIzdHN1?= =?utf-8?B?YTlmV3pNTDlEbHpKNSs5SWxUQmx6RCtIY3diSW5ubWFXM3VFaXg2VzBUczZ4?= =?utf-8?Q?iEOmWr6A6HE=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:FRWP192MB2997.EURP192.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(13230040)(376014)(1800799024)(366016);DIR:OUT;SFP:1102; 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X-MS-Exchange-CrossPremises-SCL: 1 X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: AM7P192MB0578.EURP192.PROD.OUTLOOK.COM X-Proofpoint-GUID: sqMzz6jJIky1tPEk3Jo8ddCLB8GqT0q1 X-Proofpoint-ORIG-GUID: sqMzz6jJIky1tPEk3Jo8ddCLB8GqT0q1 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODE5MDA2NSBTYWx0ZWRfX8Sq0lr+yBbCG pF4xa5QMt0XPDdLvrbVzyaPGf11ee0BU09qaAm7owZ72sq2hOVxKpN2G7xQzgwJh/1e0O8+m52E 3Mg+R1kcHUSECSxfOFYRb3Rtx3Fh7ab5+DOT9pyGoskpLvDp4nOUJCBo2bOk7pq4vAsekKp6Ivb QOYM8qyan+WL4dTUmCX6SA/crpja31BFU8fmwPf0dlDzUg25aZ+vTIUQEao5E5QtdnKDAdPZz8n 4T/0YtqEmsyVGnBynzFjNpghmHXTU8s0w+2xiyhyYBsw9lhMyZXNWsvKaK3LVAyllHGKTgYtz84 mnt/plvtaOV7mzcePtYlyZTDPGBntuF0/ZvGv9q8CK9tKPyjuqZ3z0Dr55/rEGPaQ/qCFJJzH2E UvoJVBDJHnq6Im9aRTawL1A5pJhi3w== X-Authority-Analysis: v=2.4 cv=K6B73yWI c=1 sm=1 tr=0 ts=68a420ee cx=c_pps a=7npOGqyay3yyVygbfyT32Q==:117 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=8gLI3H-aZtYA:10 a=P3XI3Sk0-mpVhaV6S1kA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250819_000015_849987_5699F80A X-CRM114-Status: GOOD ( 20.87 ) X-BeenThere: ath12k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "ath12k" Errors-To: ath12k-bounces+ath12k=archiver.kernel.org@lists.infradead.org Am Tue, Aug 19, 2025 at 02:38:38PM +0800 schrieb Baochen Qiang: > > > On 8/15/2025 4:13 PM, Alexander Wilhelm wrote: > > Hello devs, > > > > I'm currently working on getting the 'ath12k' driver running on a big endian > > PowerPC platform and have encountered the following issue. > > > > In the function 'ath12k_dp_rx_process_reo_status', the REO status is determined > > by inspecting memory that the hardware has previously written via DMA. > > Specifically, during the call to 'ath12k_hal_srng_access_begin', the driver > > reads the value of 'hp_addr' for the destination ring (in my case, always with > > ID 21). On the big endian platform, this value is consistently 0, which prevents > > the REO status from being updated. > > This does not seem an endian issue to me, because either of them we should get a value > other than 0. Really? I always assumed the value remains 0 until the firmware writes something to memory and moves the head pointer of the SRNG ring buffer. By the way, I've already implemented the missing endianness conversions for reading from and writing to ring buffer pointers like this one: hp = le32_to_cpu(*srng->u.dst_ring.hp_addr); > > Interestingly, DMA read/write accesses work fine for other rings, just not for > > this one. What makes the REO status ring so special? I couldn’t find anything in > > the initialization routine that would explain the difference. > > > > Could anyone give me a hint on what I should be looking for? > > > > > What hardware are you using? WCN7850 or QCN9274? I'm using QCN9274-based dualmac modules. Best regards Alexander Wilhelm