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Tue, 03 Nov 2026 03:35:36 -0800 (PST) Received: from [10.217.219.98] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2eb39052effsm39802075ad.3.2026.11.03.03.35.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Nov 2026 03:35:35 -0800 (PST) Message-ID: <0b80b85a-5a56-475d-9dde-0d554f8ec8aa@oss.qualcomm.com> Date: Tue, 3 Nov 2026 17:05:31 +0530 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 2/3] i2c: qcom-geni: Add bus recovery support for FIFO mode To: Aniket Randive , Vinod Koul , Frank Li , Viken Dadhaniya , Andi Shyti Cc: naresh.maramaina@oss.qualcomm.com, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org References: <20261103-20260826_aniket_randive_oss_qualcomm_com-v4-0-59b3ce96dc4b@oss.qualcomm.com> <20261103-20260826_aniket_randive_oss_qualcomm_com-v4-2-59b3ce96dc4b@oss.qualcomm.com> Content-Language: en-US From: Mukesh Savaliya In-Reply-To: <20261103-20260826_aniket_randive_oss_qualcomm_com-v4-2-59b3ce96dc4b@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYxMTAzMDA0NiBTYWx0ZWRfX7uageh/Kvueq ZdpFnaa0lBvhaWf5aT+PaXB+H8428GSV283rBRbWHpqaA0Hp3Banhb5EzRf2l8xo6UQPRl2PDRu ukGopieKdz17fmwWRhPEJttiqnPVyq4= X-Proofpoint-ORIG-GUID: qNb9Jq1aWOxjJexPifrDUJ84yeqvpZsH X-Authority-Analysis: v=2.4 cv=F73C5ahN c=1 sm=1 tr=0 ts=6ae9c70a cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=kinZEuG-tb8UP0AvViIA:9 a=QEXdDO2ut3YA:10 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-GUID: qNb9Jq1aWOxjJexPifrDUJ84yeqvpZsH X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTAzMDA0NiBTYWx0ZWRfX7VhMYvveBEOA WBGBQ/duAAB5ShX5GCjU9pWf1HKWrczezJcW6aBOngbk1CZLz2Weq9K8uYxnN1sChhqxCqrmgY9 Zt9hc51TRwpnQBCb/xfVZBIlTtL+so65flJXb8/SXgFqwryrfB6B/zhIiwOPkZpkCnti19QNFUs /vEgz7G3I80FhlgFq9hlRG3xr1yjKtxgDotj6A8ZxkdDw9VRatWsqQRWE0plTTPKAwf9nzsB5Y4 l/wibgm851Lfb3VubNnPHG2cuTtSYGNAIrWWg8eEL00fzSMQWnSOiKcbfwq7I1dNqVme6sPy9C2 eFpZ+ooSh7CyKPJpbAYezRjKtHW2f8+d1wv35m7RSROqIp8n8LIoilpgWNm7PtTd0VqoJuazFby eYmToJZM8a4zvhb7RuyvUonfSaaBw3RbxqUwkuTiqlZS3UQCVBT4CUb19I06x6JPppInUFhTg/c fzQoV1AA51e3+8E/5kQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-03_02,2026-11-02_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 clxscore=1015 impostorscore=0 adultscore=0 suspectscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611030046 On 11/3/2026 2:26 PM, Aniket Randive wrote: > I2C transfers in FIFO mode can fail with -EPROTO, -ETIMEDOUT or > -EAGAIN when a target holds SDA low, leaving the bus stuck and > preventing subsequent transactions. > > Add bus recovery support using the I2C_BUS_CLEAR and I2C_STOP_ON_BUS > hardware opcodes to restore the bus to an idle state. Check the SDA > line state through SE_GENI_IOS.RX_DATA_IN and skip recovery when the > bus is already free. Trigger recovery automatically from > geni_i2c_xfer() on -EPROTO, -ETIMEDOUT and -EAGAIN (arbitration-lost) > errors, and register the recovery callback through i2c_bus_recovery_info > to allow recovery via i2c_recover_bus(). > > Use the adapter timeout for recovery commands. Configure the serial clock > and bus timing after runtime resume so direct calls to i2c_recover_bus() > do not depend on an earlier transfer having configured them. > > This adds bus recovery support for FIFO mode only. > > Signed-off-by: Aniket Randive > --- Reviewed-by: Mukesh Kumar Savaliya