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([2001:470:42c4:101:428a:c1ef:eb45:32d8]) by smtp.gmail.com with ESMTPSA id m10-20020a92caca000000b003426356a35asm4354941ilq.0.2023.09.05.13.24.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Sep 2023 13:24:52 -0700 (PDT) Message-ID: <74c93380-2f2a-f42d-027a-8c827e794812@gmail.com> Date: Tue, 5 Sep 2023 14:24:50 -0600 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v6 2/5] PCI: brcmstb: Configure HW CLKREQ# mode appropriate for downstream device Content-Language: en-US To: Jim Quinlan , linux-pci@vger.kernel.org, Nicolas Saenz Julienne , Bjorn Helgaas , Lorenzo Pieralisi , Cyril Brulebois , Phil Elwell , bcm-kernel-feedback-list@broadcom.com Cc: Florian Fainelli , Jim Quinlan , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=c5=84ski?= , Rob Herring , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , open list References: <20230623144100.34196-1-james.quinlan@broadcom.com> <20230623144100.34196-3-james.quinlan@broadcom.com> From: Sam Edwards In-Reply-To: <20230623144100.34196-3-james.quinlan@broadcom.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230905_132456_879834_A93C42CE X-CRM114-Status: GOOD ( 10.56 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/23/23 08:40, Jim Quinlan wrote: Hi Jim, As I understand, the issue that this patch fixes can be difficult to trigger reliably. So I'll report that the abort occurs 100% of the time on a Compute Module 4, installed in slot 3 of a Turing Pi 2 cluster board, when a bootloader (U-Boot, in my case) is in the boot path. The third slot of the TP2 board connects to an ASM1061 chip with the CLKREQ# line left floating. I do not know why the bootloader is necessary for the crash to occur; I suspect it's timing-related. With this patch applied to my kernel, my observed crash rate goes from 100% to 0%, so: > Signed-off-by: Jim Quinlan > Tested-by: Florian Fainelli > Tested-by: Cyril Brulebois Tested-by: Sam Edwards Many thanks, Sam _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel