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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-b472d76f9d5sm9646108a12.45.2025.08.18.23.38.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Aug 2025 23:38:43 -0700 (PDT) Message-ID: Date: Tue, 19 Aug 2025 14:38:38 +0800 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: ath12k: REO status on PPC does not work To: Alexander Wilhelm , Jeff Johnson Cc: ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org References: Content-Language: en-US From: Baochen Qiang In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=Sdn3duRu c=1 sm=1 tr=0 ts=68a41bf5 cx=c_pps a=Qgeoaf8Lrialg5Z894R3/Q==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=HThdk4v1ZfnwiNzKKCMA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=x9snwWr2DeNwDh03kgHS:22 X-Proofpoint-ORIG-GUID: 9OEdh6XW0SqXcB0Eq1wfVchBPGSeb9d9 X-Proofpoint-GUID: 9OEdh6XW0SqXcB0Eq1wfVchBPGSeb9d9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODE2MDA0MiBTYWx0ZWRfX0i89U6lMrRUG Yp37XShJlu82cHhctKLbEw0gN3Bg2ZPJ/bVXYBMfNwcvF2W5Y/9H4sykC26sTuVmv1GgnIDXtIB qJww437jQcYiHOgUsjupBreqhHqJlhfnpfQK25RQ3sVdS+QKh1Ho8iVnlJM34Zox7m/h4vPvurW X25lFlczuMEax2EZ5cIq8HOIRotZ//lm+1mkPdzsP+WjNEPsDtQ12EciWrgZ+rELImCkcm3bacZ mqJqyxoMj8/0o40cec/PSPyE6N4YEX7IxHMVljCnaj1zV2McPV3GUjT39iU5AwtyKdcGDlxH+GL rdxHu/KIZqaIqf1qUlnkqDRkEYC1Hd3NjxA1Qf24nplcItdVaj9J3RjB7WXHx7DLhX1CFKhvMM8 S8BwTaOO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-19_01,2025-08-14_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 spamscore=0 adultscore=0 malwarescore=0 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508160042 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. > > 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? > Best regards > Alexander Wilhelm >