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Wed, 11 Nov 2026 05:54:59 -0800 (PST) Received: from [192.168.1.110] ([178.197.218.7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4ba01fe2c5asm217004135e9.5.2026.11.11.05.54.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Nov 2026 05:54:58 -0800 (PST) Message-ID: <8a557bae-42ae-42bd-a149-cf854b7af9d5@oss.qualcomm.com> Date: Wed, 11 Nov 2026 14:54:54 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional To: Maxime Ripard Cc: Dmitry Baryshkov , Neil Armstrong , Jessica Zhang , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Joel Selvaraj , Jagan Teki , Ondrej Jirman , Javier Martinez Canillas , Michael Trimarchi , Michael Tretter , Cristian Cozzolino , Sumit Semwal , Ryan Brue , Nickolay Goppen , Robert Chiras , Alexander Koskovich , Marijn Suijten , Geert Uytterhoeven , Magnus Damm , Chris Morgan , Barnabas Czeman , Heiko Stuebner , Luca Weiss , Arpit Saini , Michael Walle , Ritesh Kumar , Sebastian Reichel , Konrad Dybcio , Svyatoslav Ryhel , Danila Tikhonov , Jens Reidel , Michael Srba , Shawn Guo , Alexandre Mergnat , Alexander Baransky , Abhinav Kumar , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Romain TISSERAND References: <20261111110338.81717-2-krzysztof.kozlowski@oss.qualcomm.com> <43373a9e-9ff3-4641-b961-b63f4de21cb9@oss.qualcomm.com> <0f2c0eae-ed05-41a2-8688-e4b6fe1b7ff3@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTExMDA1NSBTYWx0ZWRfX0tLx2PBDCvD5 GpHvDAnOBD1IzV5FmgAL474sximMGyWUdKGWuzsnxmQdnnQoDGs8FfAEZKkQcnZSX+wOxsLXWxh zay0c9+mCGgnJr8AI83vzKjeu3ElRWogNcnr0X4RwamqRoJBtFAmFSRmKkjGNLk55s4iyJfKVTB qtgABy5QYWxYOTvPGER2Lcv1tUX55B2cWkzr6SLGritwx3XsvOfUtgtCRe2TiqLZ45WioC2AcRz nQOxo8XG88jef5VKNKOOFxiZWofYWwsNBDwFdlR283vGQjxyAbMztReYaBo57hV8Kh9VzIKVTWu uUAh0CZX78Gr5A2O2cn8x2eGqUyP+TkUVb9N0qWUjDYhAAsNGkHISRBtRPUT+D0iKwwUnukIKOV +APOvdVnmHtHnKY7mBHKA2BwkgRMB4G1RrDULDsL6tZpuwl/aZX88S9Twz5eDBvfqm4JhkH5ma3 6alBQ/DRXxugZdNGwrA== X-Authority-Analysis: v=2.4 cv=cJl1IVeN c=1 sm=1 tr=0 ts=6af473b4 cx=c_pps a=UbhLPJ621ZpgOD2l3yZY1w==:117 a=uyPgTw0bjBTS2cVxpiNm5w==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=24t1FKQVs-zwlIjxmd8A:9 a=QEXdDO2ut3YA:10 a=TOPH6uDL9cOC6tEoww4z:22 X-Proofpoint-GUID: YRbXnHtSORKlL1Mjrk9mi1M_jqPRHhRO X-Proofpoint-ORIG-GUID: YRbXnHtSORKlL1Mjrk9mi1M_jqPRHhRO X-Proofpoint-Spam-Info: AW1haW4tMjYxMTExMDA1NSBTYWx0ZWRfX7XuOn1SQ6AOL tJMRHx8aiIL2H7tUb9O2aDM34LlekAoj8xX7aIO51HEIur0vdeRRC7/vr/nY7l6Lg8Fiq3f9bI7 WQeyTDISvzT9R8kE1FuPafJpn8Yd1Xc= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-11_02,2026-11-11_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 malwarescore=0 phishscore=0 suspectscore=0 priorityscore=1501 spamscore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611110055 On 11/11/2026 14:52, Maxime Ripard wrote: > On Wed, Nov 11, 2026 at 01:44:23PM +0100, Krzysztof Kozlowski wrote: >> On 11/11/2026 13:37, Dmitry Baryshkov wrote: >>> On Wed, Nov 11, 2026 at 01:31:39PM +0100, Krzysztof Kozlowski wrote: >>>> On 11/11/2026 13:30, Krzysztof Kozlowski wrote: >>>>> On 11/11/2026 12:13, Maxime Ripard wrote: >>>>>> On Wed, Nov 11, 2026 at 12:03:39PM +0100, Krzysztof Kozlowski wrote: >>>>>>> DSI panels can be placed under DSI bus directly and many Linux DRM >>>>>>> drivers will work fine with it: mipi_dsi_host_register() adds device for >>>>>>> such panel and DRM driver does not use OF graph to configure lanes. >>>>>> >>>>>> That's not true. We do use the endpoints to configure the lanes through >>>>>> the data-lanes property. See drm_of_get_data_lanes* >>>>> >>>>> Some drivers use endpoints, some not. As discussed on other thread, >>>>> there are more than which do not. >>>> >>>> "there are more than one which do not." >>> >>> Which means that those should be fixed. We have legacy cases where the >>> drivers assumed that, but we should not target legacy. >> >> These legacy drivers work fine for 10 or 15 years, like Exynos. >> >> You can improve them, for sure, but if no one does that then requiring a >> graph is a mistake there, from the panel point of view. > > At the very least the commit log needs some work then, because the > situation you describe in it is simply wrong, and quite different to the > situation you then described. Commit msg said: "many Linux DRM drivers will work fine with it" So many->some? Is this the only problem? What else is not described in commit msg? Best regards, Krzysztof