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Fri, 15 Aug 2025 08:13:08 +0000 Date: Fri, 15 Aug 2025 10:13:00 +0200 From: Alexander Wilhelm To: Jeff Johnson Cc: ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Subject: ath12k: REO status on PPC does not work Message-ID: Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/2.1.4 (2021-12-11) X-ClientProxiedBy: GVYP280CA0036.SWEP280.PROD.OUTLOOK.COM (2603:10a6:150:f9::13) To FRWP192MB2997.EURP192.PROD.OUTLOOK.COM (2603:10a6:d10:17c::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: FRWP192MB2997:EE_|GV1P192MB2540:EE_ X-MS-Office365-Filtering-Correlation-Id: d3bbe468-addb-42ac-37e1-08dddbd39174 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?TUxjRE9yU1c0Y0FCWEMzaS9RUGlrclFHekppZWRZREN1SktQOFVhcWRWT3JQ?= =?utf-8?B?OThycjN4N2syWHFITlhzUXR5WjAwek90cUU0WHJoTCtIeEF4Y2dQaGlKbERF?= =?utf-8?B?eTE3b2w4aHZLcDRwcHJaZHcvckxKY1pUNHozU1ZyZG9yUTlVUmVGaDQ4SmdO?= =?utf-8?B?QlJWYmNZRXY0WTZVOCtuWmVvTy82MEVaMkhxL0R6MXdJbTcxZjEvc2lCbXla?= =?utf-8?B?b2J2YWxyck5YUXNKOEc2eU4wM0hIWlpyMlVYMTlMdkVNZFpxWTBveWxCUDNW?= =?utf-8?B?bFViclRYdHV4clVqV3huODRPbjBRbFBEcHVFZ0R5VUZPb3dYMDBnRllvMUpT?= =?utf-8?B?dEJGYWFPRHQxT2dMb01Md3RIcGtPSHVFTmE2Y1Z6R3pFY3lCWTA4ZUhYbllI?= =?utf-8?B?R0NHYlhJcDVoQUJveldxd1FxVVdqQ0hHYXgxZ0E0WktKY2FDeXJ6QlJTZUxn?= =?utf-8?B?V1FsZjE3U04yMmM4WHBjOWNaK3hNeEN2eVJra3FVOCtlSTdVdWlHdkYrMy9C?= =?utf-8?B?QW1aQmVZTTdzVWVzV0wvREM1SE1ZNVI2SlJhVUM1YXdTQjFFbWFiVDd0Y0ZG?= =?utf-8?B?bWxDeS9STHE1MkM3YXFQTFNsak52VlVmUm1SVzZWQitHakgrUGJJMVJ0R25h?= =?utf-8?B?eFNPaTFhU2k5WWlUNWgwelMrRzdFSDNMYkZtdGRJVU05a2x0c2FuR1Z3d25J?= =?utf-8?B?NmczdlJtWGdRKytVbXoxMnhjZlYxc3pocXRscitNelJaMnA0WGpCK0hEeis0?= =?utf-8?B?ekxKKzgzUEswSlNnYmU5TENlV3BuQ1g1a2QrQ1pSREtVOWpWWnBHZlVnRG5u?= =?utf-8?B?dXpJL2tHUDdVRXo1YWFqWW5uMUJOVXlGRXc2UlZSOUNha2M3ZlA5bktxWmRR?= =?utf-8?B?bGxuZm1Fb1g5dFEzcncxZE1CZ3ZXdEEweVhsM0JDQ2ZZWEhNOGxSVndaUzI5?= =?utf-8?B?a001MTh3ZXg5ODBSS3Z0dmgxSnVGemFMbW8xQWtkSUxUMDFXUmJHVExEVmxW?= =?utf-8?B?WTVYOUs1Z01UNXRUK3FCdlhOQ2dNaWxpeUxVQzUxRWhmdDdvcmJKUzN5M2hk?= =?utf-8?B?aXlRR0FiNmhleVEzNkVYY2U2VXdDbm1VWnJMSDZ1dkF2ZklWVGtrZENwL1pw?= =?utf-8?B?V1lnTTNna0JzbXlrUmpQeHYrTUQ1b05FWWovbFkwWHdEbUY1YkxsbVpzaDRU?= =?utf-8?B?NWRMM1Y3djk5TnMxRVZ2S1BLQmdBR205R3dpdlRmenlXRXVhNFFtWFJCUzhU?= =?utf-8?B?RktwdThFL1BiUmhaRllZUEJCRVM0RXYxekI1eHdiL1RvdVYrbzAxSlBRUXN0?= =?utf-8?B?aE5FYmNKTzUvR2kxOTVocUZPbEdUWmg5QWwrdFdKaU51bHdNNllCaXhTcjg0?= =?utf-8?B?WTVWMzVhZmYzZHc1QzhpSVF3cXNjazRlODhpbXF5ZUxqVTNBMnkzRW5GbXVh?= =?utf-8?B?TjNiVzV1NTN0azJzWnNwQTRiVXZFV0puSDMyalJHQmJrWU5MUW1jS1dBYlVv?= =?utf-8?B?RWFENmhpQy9vbzhVRmJ6VWRqVlZoY1BrVlZaSG43S1pjaUZjWFQ2NG1wa3VE?= =?utf-8?B?SkpDR2NSQjBSQy8yUGs1bmN0TFMxN2ZRem1iTkxOMWUwYVlFQ28rS2NVdnJj?= =?utf-8?B?aEpvS0IxQzdTTG83NFMydjhDeWYrLzNWbmpmemRxamxqVG5iZy9sVlNBSU1r?= =?utf-8?B?MXVLUDRkTC9yMFNVa2RnTmVhY3lCZDRNcm1WZ1NUV1I5NTJUdytVdDl4dVBy?= =?utf-8?B?YVZPc2ROeWNwQWw2OEd0b0VaZ25JOTF3OFlZblQzRDhPNnJpMzBzZ2JHQ0JY?= =?utf-8?B?ejhkY0RiVHYvQTFVSE1uTkx5RUdWNC9uVm9RVjRuN0hYYXRCRHpBRklIcmZn?= =?utf-8?B?RVZ2Y2lxazN4UkVzdC9GL2xNNUVGMGZKa0RVcUxOSEJOSEplV09scSt0S3pi?= =?utf-8?Q?qRxbaCcLBUc=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)(366016)(1800799024)(376014);DIR:OUT;SFP:1102; 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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 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. 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? Best regards Alexander Wilhelm