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Thu, 13 Aug 2026 23:37:16 -0700 (PDT) From: Mehmet Fide To: Ping-Ke Shih Cc: Bitterblue Smith , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Mehmet Fide Subject: Re: [PATCH rtw-next v3] wifi: rtw88: usb: route bmc frames via the high queue only for DTIM delivery Date: Fri, 14 Aug 2026 08:37:14 +0200 Message-ID: <20260814063714.2480456-1-mehmet.fide@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260814053426.2473247-1-mehmet.fide@gmail.com> References: <20260814053426.2473247-1-mehmet.fide@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Mehmet Fide Hello Ping-Ke, One more data point that may be useful for the firmware side, separate from this patch. While comparing against the vendor driver I noticed a difference in how MORE_DATA is terminated. rtw88 sets the bit on every high queue frame (rtw_tx_fill_tx_desc(): more_data = qsel == TX_DESC_QSEL_HIGH), including the last one. The vendor driver releases the high queue as an explicit batch and sets mdata = 1 on all frames of the batch except the final one, which carries 0 (chk_bmc_sleepq_hdl() in core/rtw_mlme_ext.c of the 88x2bu source). On both RTL8822BU and RTL8821CU I measured the high queue draining at roughly 3 frames per DTIM with BIT_TCR_UPDATE_HGQMD set, instead of the whole buffered burst, so the burst fetch of 076f786a0ae1 does not seem to engage on these chips. A never-terminated MORE_DATA chain is my best guess for why, but that is a guess; whether the hardware needs the 0 to conclude a burst is something only the firmware documentation can answer. Thanks, Mehmet