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Wed, 01 Oct 2025 02:35:15 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHYUv/Dm0XesDSTyHwQm2dVe57hhTs7K33D3ebSSuW0U2zhQHMjz1FXWOI+Y+NBaNAKCKO4DQ== X-Received: by 2002:a17:903:2384:b0:26c:3e5d:43b6 with SMTP id d9443c01a7336-28e7f2f4ef0mr36260875ad.32.1759311315356; Wed, 01 Oct 2025 02:35:15 -0700 (PDT) Received: from [10.217.219.207] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-27ed671d8c6sm181633145ad.56.2025.10.01.02.35.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Oct 2025 02:35:15 -0700 (PDT) Message-ID: <32fd77a1-f352-4f82-be18-c978fabac280@oss.qualcomm.com> Date: Wed, 1 Oct 2025 15:05:09 +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 v8 2/2] i2c: i2c-qcom-geni: Add Block event interrupt support To: Jyothi Kumar Seerapu , Vinod Koul , Viken Dadhaniya , Andi Shyti , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= Cc: linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, quic_vtanuku@quicinc.com References: <20250925120035.2844283-1-jyothi.seerapu@oss.qualcomm.com> <20250925120035.2844283-3-jyothi.seerapu@oss.qualcomm.com> Content-Language: en-US From: Mukesh Savaliya In-Reply-To: <20250925120035.2844283-3-jyothi.seerapu@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: C4XYLrhZirwW4rxZBAM18bKihcTkpJn0 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTI3MDAxNyBTYWx0ZWRfX1/vWCt2Wa6q8 0rOrT9VRlRmGWuvDTm8w/Inkula0MRkJu593gh8VRzHqXgoXW9apK8O0OE6zzsFNPkxU/2jsRtE msCkg/jVFeegnuW5jOQUhCNMlcejyj1jeQOuU9UhUHv7kTQneagFV5enAdIa7+ibJLgGgBfhIxX BtTzQkKkv/LPRmZHiWukqXaBebZ8yeT4+R1WJ6/h49vR2RRUCcb2t2gwC9XciYeQ5YYejtro/L5 avIlOaBPdcW34YelngIbOLHnVW+sxZfUJA2hWxunySi09N7pOSJN9qYXEmPYvyKGJ4nwTNOM6z1 U2GzEYfQ6nsIjM0/yaj1fwjgacdklkfjD+/YzEbahHffydD2G65laM82OVBfABZQvw4lM8qFVTo ZxBvPihDEHo7V33qOJJ8DxVR1/xQSQ== X-Authority-Analysis: v=2.4 cv=IeiKmGqa c=1 sm=1 tr=0 ts=68dcf5da cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=x6icFKpwvdMA:10 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=fvgdV2PV7z-sFcuOFeoA:9 a=QEXdDO2ut3YA:10 a=GvdueXVYPmCkWapjIL-Q:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-ORIG-GUID: C4XYLrhZirwW4rxZBAM18bKihcTkpJn0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-01_02,2025-09-29_04,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 suspectscore=0 spamscore=0 adultscore=0 impostorscore=0 phishscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2509150000 definitions=main-2509270017 On 9/25/2025 5:30 PM, Jyothi Kumar Seerapu wrote: > From: Jyothi Kumar Seerapu > > The I2C driver gets an interrupt upon transfer completion. > When handling multiple messages in a single transfer, this > results in N interrupts for N messages, leading to significant > software interrupt latency. > > To mitigate this latency, utilize Block Event Interrupt (BEI) > mechanism. Enabling BEI instructs the hardware to prevent interrupt > generation and BEI is disabled when an interrupt is necessary. > > Large I2C transfer can be divided into chunks of messages internally. > Interrupts are not expected for the messages for which BEI bit set, > only the last message triggers an interrupt, indicating the completion of > N messages. This BEI mechanism enhances overall transfer efficiency. > > BEI optimizations are currently implemented for I2C write transfers only, > as there is no use case for multiple I2C read messages in a single transfer > at this time. > > Signed-off-by: Jyothi Kumar Seerapu > --- > Acked-by: Mukesh Savaliya