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Mon, 28 Sep 2026 02:08:19 -0700 (PDT) X-Received: by 2002:a05:6a00:1494:b0:880:f76a:baa9 with SMTP id d2e1a72fcca58-880f76acb72mr5441983b3a.14.1790586498695; Mon, 28 Sep 2026 02:08:18 -0700 (PDT) Received: from [10.218.31.237] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-883218be96bsm1273172b3a.52.2026.09.28.02.08.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Sep 2026 02:08:18 -0700 (PDT) Message-ID: Date: Mon, 28 Sep 2026 14:38:14 +0530 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: [PATCH RESEND] dmaengine: qcom: bam_dma: Defer IRQ trigger type to device tree From: Vishnu Santhosh To: Frank Li Cc: Vinod Koul , Frank Li , Andy Gross , linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, Deepak Kumar Singh References: <20260717-qcom-bam-dma-irq-trigger-v1-1-6405eac86f00@oss.qualcomm.com> <64fc0855-3dd5-4668-9d4d-bd82be246de8@oss.qualcomm.com> Content-Language: en-US In-Reply-To: <64fc0855-3dd5-4668-9d4d-bd82be246de8@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=VvS2kO2n c=1 sm=1 tr=0 ts=6aba2e84 cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=P-IC7800AAAA:8 a=EUspDBNiAAAA:8 a=-r3nWBXi7OZqocfuUhQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 a=d3PnA9EDa4IxuAV0gXij:22 X-Proofpoint-GUID: x-wu4MdSzJRDsNcL6mgRc1C3AWRr3Qyt X-Proofpoint-ORIG-GUID: x-wu4MdSzJRDsNcL6mgRc1C3AWRr3Qyt X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTI4MDAzNiBTYWx0ZWRfX41moFPJ3y8wP DCrzTCQlfi8gSWYOSuPmL66aRYpQArIDMunqvNnwaiQvHM6DWz9ZkQkP1oH5x7/FAaAEHhCHdjD bTt8RDB5qOBtrvSQu8xprFxu4i+w1ePGFe6/smQ433lsSglE+uX19InWMOoWcbC6UiMuecTUYXV 6hU8BKSRC0PPNbZlN6lJcP8ZxySW9ToLYNdvwlYmTujWpJKsG1WG/5UJTAvsTwLyWj24HhLiYQC DHvZnfLiCKQzVqCM3T7RY3w6XLJCWWuTbPFqLJEjFpsh7HEWDAhXigd2Qv2KAQzWyKL2jYq806r pOu/aFu+ny6BQfj9OX8RjuPdufcs/fAHwV7p05EDmb6p5BHpxHXi3369YcDElRXSPVRGINstnFF ATSG02sNxYhlpaYBkpbeWZ2JPrFPftxXzO5MvwIsQiNHcfCT3c5DR/aEZ8mGwyqPkpvKPFxy5Ck 7kveINx4xI6m45GuKeg== X-Proofpoint-Spam-Info: AW1haW4tMjYwOTI4MDAzNiBTYWx0ZWRfX6qsccSXz+LFr M8W+PqrHKeVn/3ih68Sfd5F5K+RdnERM4yRH9uuEQ81aKZBbbKyI0intEbb6XaTNkU+M8Q1qXmK zYyxnZOf05xczXHhh4NrQBsVUeL5iGM= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-28_01,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 clxscore=1015 priorityscore=1501 spamscore=0 malwarescore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609280036 Hi Frank, On 16-09-2026 08:30 pm, Vishnu Santhosh wrote: > > On 15-09-2026 07:36 pm, Frank Li wrote: >> On Fri, Jul 17, 2026 at 10:30:28AM +0530, Vishnu Santhosh wrote: >>> The driver hardcodes IRQF_TRIGGER_HIGH when registering the BAM >>> interrupt, which overrides the trigger type specified in the device >>> tree. On Qualcomm Shikra SoC, the A2 BAM signals an edge interrupt >>> to the apps processor; registering it as level-high causes the >>> interrupt to not fire, resulting in missed DMA completions. >>> >>> Use IRQF_TRIGGER_NONE instead, which causes the kernel to use the >>> trigger type already configured by platform_get_irq() when it parsed >>> the device tree interrupts property. This makes the driver >>> platform-agnostic. >> where show this? can you point me doc or code? >> >> Frank > > Hi Frank, > > The BAM driver obtains the IRQ through platform_get_irq(): > > bdev->irq = platform_get_irq(pdev, 0); > > in > https://elixir.bootlin.com/linux/v7.3-rc3/source/drivers/dma/qcom/bam_dma.c#L1270 > > It then registers the same IRQ with: > > ret = devm_request_irq(bdev->dev, bdev->irq, bam_dma_irq, >                          IRQF_TRIGGER_HIGH, "bam_dma", bdev); > > in > https://elixir.bootlin.com/linux/v7.3-rc3/source/drivers/dma/qcom/bam_dma.c#L1335 > > The comment above IRQF_TRIGGER_NONE in include/linux/interrupt.h > states that when no trigger flag is specified, the interrupt uses the > trigger type already > configured by the machine or firmware. > > https://elixir.bootlin.com/linux/v7.3-rc3/source/include/linux/interrupt.h#L25 > > > Therefore, IRQF_TRIGGER_HIGH overrides the trigger type associated > with the IRQ during > DT/IRQ-domain mapping, while IRQF_TRIGGER_NONE preserves it. > > The Shikra DTS which is still under review describes the BAM interrupt > as edge-triggered: > > interrupts = ; > > This driver change is needed so that the DT-specified trigger type > remains effective once > the Shikra DTS change is accepted. > > > Thanks, > Vishnu > Gentle ping on this patch. Please let me know if any other information to be shared from my side. Thanks, Vishnu > >> >>> Fixes: e7c0fe2a5c84 ("dmaengine: add Qualcomm BAM dma driver") >>> Co-developed-by: Deepak Kumar Singh >>> Signed-off-by: Deepak Kumar Singh >>> Signed-off-by: Vishnu Santhosh >>> --- >>>   drivers/dma/qcom/bam_dma.c | 2 +- >>>   1 file changed, 1 insertion(+), 1 deletion(-) >>> >>> diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c >>> index >>> 19116295f8325767a0d97a7848077885b118241c..6c3e2ca8a572fd04c925de0adbd5cc0616b361ef >>> 100644 >>> --- a/drivers/dma/qcom/bam_dma.c >>> +++ b/drivers/dma/qcom/bam_dma.c >>> @@ -1303,7 +1303,7 @@ static int bam_dma_probe(struct >>> platform_device *pdev) >>>           bam_channel_init(bdev, &bdev->channels[i], i); >>> >>>       ret = devm_request_irq(bdev->dev, bdev->irq, bam_dma_irq, >>> -            IRQF_TRIGGER_HIGH, "bam_dma", bdev); >>> +            IRQF_TRIGGER_NONE, "bam_dma", bdev); >>>       if (ret) >>>           goto err_bam_channel_exit; >>> >>> >>> --- >>> base-commit: e43ffb69e0438cddd72aaa30898b4dc446f664f8 >>> change-id: 20260601-qcom-bam-dma-irq-trigger-0366e7e86f17 >>> >>> Best regards, >>> -- >>> Vishnu Santhosh >>>