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Wed, 29 Jul 2026 04:11:57 -0700 (PDT) X-Received: by 2002:a05:622a:15d5:b0:51b:ff78:f229 with SMTP id d75a77b69052e-529d6feaeabmr53202011cf.5.1785323516876; Wed, 29 Jul 2026 04:11:56 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1f83cde4dbsm101887966b.15.2026.07.29.04.11.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Jul 2026 04:11:56 -0700 (PDT) Message-ID: Date: Wed, 29 Jul 2026 13:11:53 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6/8] platform: arm64: qcom-hamoa-ec: Retry I2C transfers on NACK To: Anvesh Jain P , Sibi Sankar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Hans de Goede , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Bryan O'Donoghue , Bjorn Andersson , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org References: <20260728-ec_add_more_commands-v1-0-771abd65ee1a@oss.qualcomm.com> <20260728-ec_add_more_commands-v1-6-771abd65ee1a@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260728-ec_add_more_commands-v1-6-771abd65ee1a@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI5MDA5MiBTYWx0ZWRfXwL8nCyFM+LFG CMzJ+0JEhU3C+kuAWXYzPQDmf+/lXt5Ps3XUCsq5R0/sHea769ePAE8eK8oSPV/433BZ94cqj6v InSLi7WUJJTnfTjRld/moza/YjLSa07Ks77R8w16c3MfPo44lpF1DFzkBUu74NhX/HN4OtQi748 TCtlpXZQtXq+kBLcloADVO7vkKUtnI9j0bwQwJ0pah/rdfG1HQ/sfEJybrZicRZ+CCt2ZJgjpg4 6zNNV5ZRNcBnRa/EjsNJP+/U7asU2fJW9mrF7S73KADG93vz0KWXkqmVyfUPoPrF8v+dnC2eGKQ vpBNwRdCcNLQe/EV12ZCar6mAz7TU00B+fOgGnwrURK9Iwq2SIQq1/8ZxcI71FarwefgXENriwJ cTlZCMX0hksmUlgeYW8l5FHkrgX9R62KJdaxV7IXM1CemPi64xxT22piAukTmBoivtxlRAUtg7L ZuMLQCGL+LZTeBPtljg== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI5MDA5MiBTYWx0ZWRfX49Xn/0sft03Z RazPid4mpt7sp1gJeiV4tMM7oNKbrs1n6bpNXv66VojIkZnvIp4cc/YeLiPycoXkH3GpCh5N3PA 3qKvszERfPs2rPMqcNqQVhgJ5SgqJUM= X-Proofpoint-ORIG-GUID: CPWLYYp3ooKjKkTJJDIb0VPI9G-eHK4- X-Authority-Analysis: v=2.4 cv=Ap/eGu9P c=1 sm=1 tr=0 ts=6a69dffe cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=EUspDBNiAAAA:8 a=czGEQ3qvJAC79WJ7zqIA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-GUID: CPWLYYp3ooKjKkTJJDIb0VPI9G-eHK4- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-29_04,2026-07-28_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 adultscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 bulkscore=0 malwarescore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607290092 On 7/28/26 7:44 PM, Anvesh Jain P wrote: > The EC firmware NACKs the bus instead of clock-stretching while it is > busy servicing internal work (e.g. right after boot, when it is also > emitting a burst of SCI events). A transfer issued in that window fails > with -ENXIO even though the EC is otherwise healthy. > > This isn't visible with the smbus-only command set used previously; it > surfaced while stress-testing the new fan LUT command on Hamoa, which > issues raw i2c_transfer() calls more aggressively and is thus more > likely to land in the NACK window right after boot or during an SCI > event burst. > > Retry qcom_ec_write() and qcom_ec_read() a bounded number of times with > a short delay when the EC NACKs the transfer, before giving up. > > Signed-off-by: Anvesh Jain P > --- [...] > enum qcom_ec_sci_events { > EC_FAN1_STATUS_CHANGE_EVT = 0x30, > EC_FAN2_STATUS_CHANGE_EVT, > @@ -233,11 +245,20 @@ static int qcom_ec_write(struct qcom_ec *ec, u8 cmd, const u8 *data, size_t len) > msg.buf[0] = cmd; > memcpy(&msg.buf[1], data, len); > > - ret = i2c_transfer(ec->client->adapter, &msg, 1); > + for (int i = 0; i < EC_I2C_NACK_MAX_ATTEMPTS; i++) { > + ret = i2c_transfer(ec->client->adapter, &msg, 1); > + ret = ret == 1 ? 0 : (ret < 0 ? ret : -EIO); Please break this monster up. I know it already exists in-tree, but since you're moving it around, we might as well. Konrad