From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail26.static.mailgun.info ([104.130.122.26]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ivfFm-0005oR-RW for ath10k@lists.infradead.org; Sun, 26 Jan 2020 10:34:56 +0000 MIME-Version: 1.0 Subject: Re: [PATCH, v4] Revert "ath10k: fix DMA related firmware crashes on multiple devices" From: Kalle Valo In-Reply-To: <1578976521-6104-1-git-send-email-zhichen@codeaurora.org> References: <1578976521-6104-1-git-send-email-zhichen@codeaurora.org> Message-Id: <20200126103452.C3709C43383@smtp.codeaurora.org> Date: Sun, 26 Jan 2020 10:34:52 +0000 (UTC) List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "ath10k" Errors-To: ath10k-bounces+kvalo=adurom.com@lists.infradead.org To: Zhi Chen Cc: linux-wireless@vger.kernel.org, ath10k@lists.infradead.org Zhi Chen wrote: > This reverts commit 76d164f582150fd0259ec0fcbc485470bcd8033e. > PCIe hung issue was observed on multiple platforms. The issue was reproduced > when DUT was configured as AP and associated with 50+ STAs. > > For QCA9984/QCA9888, the DMA_BURST_SIZE register controls the AXI burst size > of the RD/WR access to the HOST MEM. > 0 - No split , RAW read/write transfer size from MAC is put out on bus > as burst length > 1 - Split at 256 byte boundary > 2,3 - Reserved > > With PCIe protocol analyzer, we can see DMA Read crossing 4KB boundary when > issue happened. It broke PCIe spec and caused PCIe stuck. So revert > the default value from 0 to 1. > > Tested: IPQ8064 + QCA9984 with firmware 10.4-3.10-00047 > QCS404 + QCA9984 with firmware 10.4-3.9.0.2--00044 > Synaptics AS370 + QCA9888 with firmware 10.4-3.9.0.2--00040 > > Signed-off-by: Zhi Chen > Signed-off-by: Kalle Valo Patch applied to ath-next branch of ath.git, thanks. a1769bb68a85 Revert "ath10k: fix DMA related firmware crashes on multiple devices" -- https://patchwork.kernel.org/patch/11331293/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k