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Wed, 02 Sep 2026 03:37:07 -0700 (PDT) X-Received: by 2002:a05:620a:4001:b0:939:216c:59dd with SMTP id af79cd13be357-939610194bbmr236832785a.4.1788345427214; Wed, 02 Sep 2026 03:37:07 -0700 (PDT) Received: from [192.168.202.12] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c25cffc5d85sm109338866b.1.2026.09.02.03.37.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Sep 2026 03:37:06 -0700 (PDT) Message-ID: Date: Wed, 2 Sep 2026 12:37:04 +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] clk: qcom: camcc-sdm845/670: Raise CSIPHY timer clock limit To: david@ixit.cz, Bjorn Andersson , Stephen Boyd , Brian Masney , Jerome Brunet , Bryan O'Donoghue , Vladimir Zapolskiy , Loic Poulain , Mauro Carvalho Chehab Cc: linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, phone-devel@vger.kernel.org References: <20260822-csiphy-sdm845-limits-v1-1-d360bf7cd38f@ixit.cz> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260822-csiphy-sdm845-limits-v1-1-d360bf7cd38f@ixit.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTAyMDA5MyBTYWx0ZWRfX+esoM90sIKY8 mR50nBhQjiuWkah+dnZ9kxB7FYdFG72soldPzn/qqiDd7Ej/6nSXO2kfKkqQQrC2CF/QckL9yZ6 Qp8VYdQK8tshsbTgf7Fc6xqtuu0da0xiacv7LI9mE0DK0b9+poUAbRkbu6/PxgSu9ZSUEefdjdm lvsW0KMFp6tZVg/Isl8xRvg9rlkg9BndaepASIc0fIB/KjulROk2bSsjSt8UV+RcRChDj4GNFjG hohGLGz4J5vkDpW+44ATk7xjEFlEHk0PQl+cUAQ0dJGgSFNhwkoBn1SakfE2/zCTOgrZq9PcpYo /zWYQA2B/IMCJuQZXUBcwNcev09MV9OAEjy6hYSKsmHO35WxxATSPgsRaJs3lSYXZkvYWDXjG52 2nwJeFh1dZcXIn2jo6w1W5gtbbCLEFmgrwDIXqm4c2rM77SBoLlJ/t1tc38fv7oS0Q6AVL8trUN Kha7/r6iInj3jG8542w== X-Proofpoint-GUID: i_KwK7O4dFQj9Wvkvo9x23_WtGKBLmG2 X-Authority-Analysis: v=2.4 cv=D8N37PRj c=1 sm=1 tr=0 ts=6a97fc54 cx=c_pps a=hnmNkyzTK/kJ09Xio7VxxA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=9zb2tplEqV-KQ8uyg_IA:9 a=QEXdDO2ut3YA:10 a=PEH46H7Ffwr30OY-TuGO:22 X-Proofpoint-ORIG-GUID: i_KwK7O4dFQj9Wvkvo9x23_WtGKBLmG2 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAyMDA5MyBTYWx0ZWRfX6TTM1391v/UB WaELJEVdIuFkVAo6ssY+Iwh9p51GVVr8we8qjctOqz8DtYrKdbpTEdHLYZnXgQTaZeTUo1bY/mt nPp17FEv6moKz+QAc5q3fn8lMu0037g= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-02_02,2026-09-01_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 lowpriorityscore=0 spamscore=0 phishscore=0 adultscore=0 malwarescore=0 clxscore=1015 impostorscore=0 priorityscore=1501 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609020093 On 8/22/26 4:25 AM, David Heidelberg via B4 Relay wrote: > From: David Heidelberg > > The sdm845 CSIPHY timer clock only listed up to 269.33 MHz, capping the > supported CSI link frequency at roughly 1.07 GHz > (CSIPHY timer = link_freq / 4). The Samsung S5K2X7SP camera runs at a > 1.15 GHz link frequency, so camss rejected powering up the > pipeline with 'Pixel clock is too high for CSIPHY'. > > Add a 288 MHz entry to the shared camcc CSIPHY timer frequency table > (PLL1 VCO 1152 MHz, well within range) and add a 400 MHz entry to the > sdm845 CSIPHY timer clock_rate tables. The camss min_rate check now > passes and the timer clock rounds to 288 MHz, matching the ~287.5 MHz > required by the 1.15 GHz link. > > Assisted-by: tencent:hy3 > Signed-off-by: David Heidelberg > --- > Tested on SHIFT 6MQ with next-20260820. Is that what happens on downstream for this device too? Is there a chance the sensor link frequency can be lowered? Generally the latest clock plan for SDM845 says that 269.333 MHz is a maximum, with the RPMHPD running at TURBO.. I would assume that while the PLL rate stays the same, the downstream branches and RCGs may not have been validated to properly function at these freqs Konrad