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Mon, 14 Jul 2025 09:57:44 +0000 Date: Mon, 14 Jul 2025 11:57:39 +0200 From: Alexander Wilhelm To: Jeff Johnson Cc: ath12k@lists.infradead.org, linux-wireless@vger.kernel.org Subject: ath12k: hal_reo_dest_ring on PowerPC? 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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 trying to bring up the ath12k driver on big endian PPC platform. Currently I'm stuck and need your help. In the function _ath12k_dp_rx_process_ inside _dp_rx.c_ the _desc_va_ is extraced as the following: desc_va = ((u64)le32_to_cpu(desc->buf_va_hi) << 32 | le32_to_cpu(desc->buf_va_lo)); desc_info = (struct ath12k_rx_desc_info *)((unsigned long)desc_va); As you can see the _buf_va_hi_ and _buf_va_lo_ are swapped on big endian since the data type is __le32. However that swap leads to kernel panic on my machine. The entire _struct hal_reo_dest_ring_ consists only of little endian member values and it seems to be correct. Therefore I assume the values are already set wrong earlier, but I cannot find a place in a source code where they are set. Can someone explain to me how and where those values are set, so I can fix the problem? Best regards Alexander Wilhelm