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Wed, 15 Jul 2026 05:22:32 -0700 (PDT) X-Received: by 2002:a05:620a:458a:b0:92e:46cd:7299 with SMTP id af79cd13be357-92ef2c7f24fmr1309032085a.8.1784118152346; Wed, 15 Jul 2026 05:22:32 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c168744bdddsm15401266b.48.2026.07.15.05.22.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 15 Jul 2026 05:22:31 -0700 (PDT) Message-ID: Date: Wed, 15 Jul 2026 14:22:27 +0200 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 2/4] dmaengine: qcom: gpi: Add lock/unlock TREs for multi-owner I2C transfers To: Mukesh Kumar Savaliya , viken.dadhaniya@oss.qualcomm.com, andi.shyti@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, vkoul@kernel.org, Frank.Li@kernel.org, andersson@kernel.org, konradybcio@kernel.org, dmitry.baryshkov@oss.qualcomm.com, linmq006@gmail.com, quic_jseerapu@quicinc.com, zhengxingda@iscas.ac.cn, kees@kernel.org, agross@kernel.org, linux-arm-msm@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Cc: krzysztof.kozlowski@oss.qualcomm.com, bartosz.golaszewski@oss.qualcomm.com, bjorn.andersson@oss.qualcomm.com References: <20260708051023.2872304-1-mukesh.savaliya@oss.qualcomm.com> <20260708051023.2872304-3-mukesh.savaliya@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260708051023.2872304-3-mukesh.savaliya@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=TMF1jVla c=1 sm=1 tr=0 ts=6a577b8a cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=EUspDBNiAAAA:8 a=s1zqTiH2bahLR0COYxoA:9 a=QEXdDO2ut3YA:10 a=zgiPjhLxNE0A:10 a=ZXulRonScM0A:10 a=zZCYzV9kfG8A:10 a=NFOGd7dJGGMPyQGDc5-O:22 X-Proofpoint-GUID: awUSHGwWrBkA5TJ0JKFwxOAvM5tOnz89 X-Proofpoint-ORIG-GUID: awUSHGwWrBkA5TJ0JKFwxOAvM5tOnz89 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE1MDEyMiBTYWx0ZWRfX0dCPigQ3Zmht Bb5MpKwL9nIV/zBAtj5gxK56atWMYNqCM5vTi7f4K3Hqs5iOl2kJaSieCMAPTI9byYdGPy23Olc mtqf+UUROX1mKLRanD9mPtW4t+zDU8E= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE1MDEyMiBTYWx0ZWRfX0NK+gXawgd/D I7g9iGJ70e9+hh8FAX0uJk+qH6ChzhjFSGiU9K4x4KtVDR0ElvloBDL0U2IDXhGQixN6i9bcOdZ b/W4LVRhnHRvUjb72T2v1oqbHs7HT5xTLVa3H8G8tdJRCwNIj6bKHxJ3FiWoZaz6HIhKVYME4PY G0TOagDbwnZPqSiQb7nudjUvsy+bePhnh/cTVG+phedQRznveeGYJmaJH54ki8TbetwT5Z0JVDq lJk83ONt12tRa1rBIogceccfkv1LyYB3EmpaXLvOl0/6U6hcg2IUw4BRCKqsRZ4Fb+9kfS0UBMM q2yF6DMnL6iW+zvGjgUVdoytCIzfmVeklu1X1eahMLmgp7f8CZDFN2ROTuPRiOiNVxTM4ft+XqV G+d2lPLHQm9XSSoZyhFS3Ql+3GPQZv16CFVfwBerI79q9sTxXW8D1cHBBTYKqu42/vr/+d2kX19 KnAAoIencr66/zJ0oOA== 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=2026-07-15_02,2026-07-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 adultscore=0 phishscore=0 suspectscore=0 impostorscore=0 priorityscore=1501 bulkscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607150122 On 7/8/26 7:10 AM, Mukesh Kumar Savaliya wrote: > Some platforms use a QUP-based I2C controller in a configuration where the > controller is shared with another system processor (described in DT using > qcom,qup-multi-owner). In such setups, GPI hardware lock/unlock TREs can be > used to serialize access to the controller. > > Add support to emit lock and unlock TREs around I2C transfers and increase > the maximum TRE count to account for the additional elements. > > Also simplify the client interface by replacing multiple boolean fields > (shared flag and message position tracking) with a single lock_action > selector (acquire/release/none), as the GPI driver only needs to know > whether to emit lock/unlock TREs for a given transfer. > > Signed-off-by: Mukesh Kumar Savaliya > --- Acked-by: Konrad Dybcio Konrad