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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-38a5d0726fbsm4218881fa.41.2026.03.10.03.36.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Mar 2026 03:36:29 -0700 (PDT) Message-ID: <2f4e4cc7-2600-482e-88d9-d4b20d328a72@oss.qualcomm.com> Date: Tue, 10 Mar 2026 11:36:26 +0100 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] arm64: dts: qcom: hamoa: Fix OPP tables for all DisplayPort controllers To: Abel Vesa , Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Rajendra Nayak , Abel Vesa , Sibi Sankar , Jagadeesh Kona , Taniya Das Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Dmitry Baryshkov References: <20260309-hamoa-fix-dp3-opp-table-v1-1-1a8141d71f9f@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260309-hamoa-fix-dp3-opp-table-v1-1-1a8141d71f9f@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=Rcmdyltv c=1 sm=1 tr=0 ts=69aff42f cx=c_pps a=DUEm7b3gzWu7BqY5nP7+9g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=eVDm5Lje-WuPLjdxqx0A:9 a=QEXdDO2ut3YA:10 a=-aSRE8QhW-JAV6biHavz:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzEwMDA5MCBTYWx0ZWRfX0mh9unm46y+P DmmDUXBKoXwEcI8UsWNgmZe/JNNjmLn3hNeDm4Qeqer/CeHNH9MouqZa75xh+fFSq8OaKPyloPB CPvQ17+Q+Go0xQ/gNRuycc5Di6eKNRttcY4/Sv/AfvV6L1RitCFfZwL5vvYaqs25GVY6KfXx1JJ dlfmmA/RDvM2zKWkyxZopic4WB3cbnepCpo2oxEyS28I+CTWXoDPLGttoq9BfBBAXCj7IG+9zed iM/uwvsTMijJyu8wS7AphCBRb2hCf+iPXgl8dtwwcGYu/WQisw5zBQJ3Ap346Z4nqWRsxf0JwyA +GcT9tKlK/Krj5iIkUqSB14LV9hfOi/eb2qA0NQywTc4amM4zDPCJQpvGGhoabO8JJLG8D41olL plDOWaMsedoGMuuimg4VifKlinKcgaHSODSPiwTv8nHgsvXHdXXEDV7XvQkD0m4ieuZ7KY/gmZQ 1AQfbQ0nDwOYOmY5/lA== X-Proofpoint-GUID: IZWDQiZbJ55YC5IG2Fhcz4zQah-U7T39 X-Proofpoint-ORIG-GUID: IZWDQiZbJ55YC5IG2Fhcz4zQah-U7T39 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-10_02,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 suspectscore=0 spamscore=0 priorityscore=1501 impostorscore=0 clxscore=1015 bulkscore=0 phishscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603100090 On 3/9/26 3:44 PM, Abel Vesa wrote: > According to internal documentation, the corners specific for each rate > from the DP link clock are: > - LOWSVS_D1 -> 19.2 MHz > - LOWSVS -> 270 MHz > - SVS -> 540 MHz (594 MHz in case of DP3) This discrepancy sounds a little odd.. can we get some confirmation that it's intended and not an internal copypasta? (+Jagadeesh, Taniya) FWIW DP3 is not USB4- or MST-capable so it may as well be > - SVS_L1 -> 594 MHz > - NOM -> 810 MHz > - NOM_L1 -> 810 MHz > - TURBO -> 810 MHz > > So fix all tables for each of the four controllers according to the > documentation. It sounds like a good move to instead keep only a single table for DP012 and a separate one for DP3 if it's really different > The 19.2 @ LOWSVS_D1 isn't needed as the controller will select 162 MHz > for RBR, which falls under the 270 MHz and it will vote for that LOWSVS > in that case. Even though the Linux OPP framework agrees with that sentiment today (it will set the correct rate via clk APIs and the correct rpmh vote for a rate that's >= 162), I have mixed feelings about relying on that Konrad