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Tue, 03 Nov 2026 02:00:16 -0800 (PST) Received: from [10.217.219.98] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2eced9d14c5sm7467525ad.74.2026.11.03.02.00.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Nov 2026 02:00:16 -0800 (PST) Message-ID: <08bb4de0-dc94-4c4f-8d1a-ad3a4fce86bb@oss.qualcomm.com> Date: Tue, 3 Nov 2026 15:30:12 +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 1/3] dmaengine: qcom: gpi: Add I2C bus recovery opcode support 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-v4-1-59b3ce96dc4b@oss.qualcomm.com> Content-Language: en-US From: Mukesh Savaliya In-Reply-To: <20261103-20260826_aniket_randive_oss_qualcomm_com-v4-1-59b3ce96dc4b@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: IVD8n04-B66u-ngeydj0PTMaywUgI5Js X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTAzMDAzOSBTYWx0ZWRfX6+ioO9AvX3mx 66iunQD+turJKm0+2p7fBQVkqmVS8Uvo/p8Mm8UnSai4hK5zh39rKqDhSf6sX7q8HOMsuiibA18 4rO6DskfIjCtiJScOnMTVqcH1E6FdgB+lOSobtFQU58LB5Xm14lpyvLyl2DWd+21WToDmBa/fIH EYCLlIbJT+5GUW1BPkZCIQUNcYaSbMASFN8wDzIidyMioRJodr/OLQV8lbPSNVwV45ibhK6gWDV TQ4UbgrOOFDwS2eyimmCJY31LtPx0RnzmNlvryQ7hOdA6+Itc1Z3YRjcnV8QB81uaQrmWONxtdQ fkR6XlIRqFeiqi7t8x4orJxHTPA0Xu26SqhRZRpfTeRo2ltkTJBqpsN5Dcmp37KLkHbXO6OCh7M tDAfnGYJZLFLyX288DRmTZmB01dk41pRb125wfnPrbkSYFTsPWT5kqxyKQZHPCz0PKH2Ok5m/Xr T905eEKJ2stg8DMnWeQ== X-Authority-Analysis: v=2.4 cv=VoG2kO2n c=1 sm=1 tr=0 ts=6ae9b0b2 cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=ue_Pd434T0zeNjF84AEA:9 a=QEXdDO2ut3YA:10 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-GUID: IVD8n04-B66u-ngeydj0PTMaywUgI5Js X-Proofpoint-Spam-Info: AW1haW4tMjYxMTAzMDAzOSBTYWx0ZWRfX3jQnP2peK64D nGSZ57OP/Qrz2X/j49xKOHVbTD5cBsrM8El3C6IysHh2/K0E8kXpAdX8YqZj51Jm0WAeQWlXHN+ H6lLm4gwO9Y+Bwo0B6L0KdIxe2xpZQo= 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_01,2026-11-02_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 spamscore=0 bulkscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 impostorscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611030039 On 11/3/2026 2:26 PM, Aniket Randive wrote: > The I2C_BUS_CLEAR and I2C_STOP_ON_BUS GENI sequencer opcodes release a > stuck I2C bus, but the GPI DMA driver has no way to emit these > zero-payload control commands, so an I2C controller using GPI DMA > cannot recover the bus. > > Add I2C_BUS_CLEAR and I2C_STOP_ON_BUS to enum i2c_op so I2C drivers can > request them through gpi_i2c_config.op. Handle them in > gpi_create_i2c_tre() by emitting a CONFIG TRE (when set_config is set) > followed by a GO TRE with IEOT set and no DMA TRE, and reserve the > matching number of ring entries in gpi_prep_slave_sg(). > > Signed-off-by: Aniket Randive > --- Reviewed-by: Mukesh Kumar Savaliya