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Tue, 16 Jun 2026 03:52:53 -0700 (PDT) X-Received: by 2002:a05:620a:1791:b0:915:8055:3f9f with SMTP id af79cd13be357-9161bcdbce5mr1719228485a.6.1781607172664; Tue, 16 Jun 2026 03:52:52 -0700 (PDT) Received: from [192.168.120.170] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bfdb7b6dbd7sm615295866b.29.2026.06.16.03.52.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Jun 2026 03:52:51 -0700 (PDT) Message-ID: <1b30fd97-b298-435d-83a4-944e536bc8d4@oss.qualcomm.com> Date: Tue, 16 Jun 2026 12:52:48 +0200 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 04/12] clk: qcom: gcc-mdm9607: Fix BIMC PLL definition To: Stephan Gerhold , Taniya Das Cc: Bjorn Andersson , Michael Turquette , Stephen Boyd , Georgi Djakov , Shawn Guo , Bryan O'Donoghue , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org References: <20260609-qcom-clk-mdm9607-fixes-v1-0-5e9717faf842@linaro.org> <20260609-qcom-clk-mdm9607-fixes-v1-4-5e9717faf842@linaro.org> <022fb465-df10-4d95-a05c-1ff8e59558c1@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=SoCgLvO0 c=1 sm=1 tr=0 ts=6a312b06 cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=Uo6mbPUbqXj1CD9ImokA:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-GUID: Eg-uPTAOv0ebYRkYscXra8BHe4au7UA5 X-Proofpoint-ORIG-GUID: Eg-uPTAOv0ebYRkYscXra8BHe4au7UA5 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE2MDExMCBTYWx0ZWRfX4wngccxFFqD/ 3GbMOwOK9pvMfCdOOLM+m3PAZMd4RZm+XHPPRbzZ13HQ3+0Fi/HA4qfz8HJzOViaeuakqLHZ2qE wgfzPjfqkDyYsrefkeWkltYTBrbDTmIILt2yG3cauCkZv9IaHiwx2lL9BrTVHTsq8UE9tb7OdR3 iRa4jZFn3GQB5bmxNEcqvtUEA5nGG0XovDX8EJJGKwft86PNtSsgH98NbKJa4pkqVuEOuZcjJbN iLBBymVLAp7EBLls8AjIzRScFDYMSmvrQwgFpBZWAs2gvSB8RWHpRgPsDdo1ly8iIsBYD2qcYb4 5NYUN23oTK5g0H0c71pusdpbA/FkXOH+qawKDk/X4norAV0ZROwcefpAV4IBCn2z2wKFjiBOuI+ L9v7dq0Ohx++NJn2nOPdjKYdkyBICkc4IjWjp/3JUThfzajBUOQCB9dGi1QaYAFT4/KuayOPXs0 xSv8Q03VdQGDt4mcXbg== X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE2MDExMCBTYWx0ZWRfX753htEEEkUEi vBTnKAa2JBHmWpi5z49GvYLV9jmPsoFlWxprcXxagV+YVlBIyb+Gdu1sGh9pUHwWFD7ZP1OrSJ/ jq2PEMFLVnSm5pP/9hAx7S39FLWgsSM= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-16_03,2026-06-15_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 clxscore=1015 spamscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606040000 definitions=main-2606160110 On 6/10/26 7:58 PM, Stephan Gerhold wrote: > On Wed, Jun 10, 2026 at 10:43:12PM +0530, Taniya Das wrote: >> On 6/9/2026 7:44 PM, Stephan Gerhold wrote: >>> The gcc-mdm9607 driver was originally based on gcc-msm8916, but a closer >>> match nowadays is gcc-msm8909. Looking at the differences between >>> gcc-mdm9607 and gcc-msm8909, there is quite some confusion around the >>> definitions for the BIMC PLL. >>> >>> It turns out the BIMC PLL on MDM9607 is actually an Alpha PLL just like on >>> MSM8909. We can vote for it using BIT(2), which explains why BIT(3) was >>> used for GPLL2. >> >> BIMC PLL is never controlled from High Level OS (APSS). These are >> controlled by other subsystems and voting should be via the ICC for BW >> requirements. >> > > The driver doesn't really control the BIMC PLL here, the PLL is defined > with fixed/shared/read-only ops so it mostly just exists to model the > clock tree properly and have the clock rate readable for the PLL itself > and any downstream consumers. > > There are multiple drivers that do it like this (e.g. gcc-msm8916, > gcc-msm8939), is there a reason why we should drop this? My fear is that the kernel may have stale data at any point.. perhaps unless we set CLK_GET_RATE_NOCACHE? Konrad