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Thu, 13 Aug 2026 05:24:31 -0700 (PDT) Received: from hu-anantiwa-hyd.qualcomm.com ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d37c49cc32sm8602385ad.63.2026.08.13.05.24.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Aug 2026 05:24:31 -0700 (PDT) Date: Thu, 13 Aug 2026 17:54:25 +0530 From: Anand Tiwari To: Dmitry Baryshkov Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, venkata.valluru@oss.qualcomm.com, vishnu.saini@oss.qualcomm.com, Jessica Zhang Subject: Re: [PATCH 1/2] arm64: dts: qcom: hamoa-iot-evk: Add eDP display overlay Message-ID: References: <20260806-edp_overlay_for-next-v1-0-c3aebbc81f38@oss.qualcomm.com> <20260806-edp_overlay_for-next-v1-1-c3aebbc81f38@oss.qualcomm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-GUID: EcQBlM4JWiV-1nHZgItthNfDlpwYDujV X-Authority-Analysis: v=2.4 cv=M7J97Sws c=1 sm=1 tr=0 ts=6a7db781 cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=kj9zAlcOel0A:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_glEPmIy2e8OvE2BGh3C:22 a=VwQbUJbxAAAA:8 a=6pqXqY8CpGGeIA0puCUA:9 a=CjuIK1q_8ugA:10 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwODEzMDA4NyBTYWx0ZWRfXwn7d9r5lJ+2h LSbFe1fc7KXI6c0tPduzIGc/FNxJirNmQRRNmdRyOEL4jYQhvSMfeiQHERtzIDcC+oPHE8JxdQ1 yMs2SIVDLVnnl2MSnxfkYdzzPMJ5bkc= X-Proofpoint-ORIG-GUID: EcQBlM4JWiV-1nHZgItthNfDlpwYDujV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODEzMDA4NyBTYWx0ZWRfX3PalsGzENcTm anBOyBlejTjJWA7mRc3TKFqGN5G6xwHfVwvbfPdrb96+nxuiD63cfzWolj3N4gsFWEUFw/Nkzoq ky8e5Pz1gl0wK9jxWlG3FB7aEMqugNvcTUqaTEtB62idkc4lB1BxWaodssd9TdYflSdIHugpGNo AjJtfPr885GXiVjE1HMF/ppO5+Xk4vDOyzeu9y347xeWj6G/puVxoV6pFntElV6xmQg4PO+fw/i PJfwMleRdi63gxaOk9NRLvCeGahSQ6d77NBRfpqJqmQpNA6puG0G3KReY4zyft4xYTzXXehVZXS 83wAE8TzigcPAAG0H2stP7mshJF04IkghsYOcryY3tpzzEY9o3w+9MbeCz7jAGTddJtTdkMlroR YawQ791aJLZHUexqJQ7ZbyM0ZCCulhWRbCKJZx5LEhBagGcVAQSz6sY94R4lNV6t8EwuIiWTuy/ WXGQQv9IuuDJwFO8OOw== 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=2026-08-13_04,2026-08-12_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 clxscore=1015 spamscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 suspectscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608130087 On Mon, Aug 10, 2026 at 12:04:21PM +0300, Dmitry Baryshkov wrote: > On Fri, Aug 07, 2026 at 03:30:13PM +0530, Anand Tiwari wrote: > > On Thu, Aug 06, 2026 at 07:05:37PM -0500, Bjorn Andersson wrote: > > > On Thu, Aug 06, 2026 at 10:01:20PM +0530, Anand Tiwari wrote: > > > > Move the eDP panel configuration and related power, backlight, and pinctrl > > > > nodes into a separate overlay. Keep the base DTB suitable for headless > > > > variants and provide a composite DTB for headed variants. > > > > > > To quote: > > > https://docs.kernel.org/process/submitting-patches.html#describe-your-changes > > > > > > """ > > > Describe your problem. Whether your patch is a one-line bug fix or 5000 > > > lines of a new feature, there must be an underlying problem that > > > motivated you to do this work. Convince the reviewer that there is a > > > problem worth fixing and that it makes sense for them to read past the > > > first paragraph. > > > """ > > > > > > In fact, I'm not even able to guess what the problem you're fixing here. > > > > > > Regards, > > > Bjorn > > > > > > > The problem is that the base device trees currently describe the eDP > > display hardware unconditionally. However, Hamoa and Purwa IoT EVKs > > are also available in headless variants without an eDP panel. > > > > With current base DTBs, headless variants are not stable where eDP panel is not > > physically connected with board and userspace is trying to use it. > > Please define "are not stable" I did not see any crash in this case but in the absence of physical panel logs are flooded with errors, userspace is trying to commit the frames since connector status is always connected: " [ 23.499621] panel-simple-dp-aux aux-aea0000.displayport-controller: Prepare timeout after 5 tries [ 23.508763] panel-simple-dp-aux aux-aea0000.displayport-controller: Couldn't power on panel to ID it; using conservative timings: -110 [ 52.143157] [drm:dpu_kms_wait_for_commit_done:525] [dpu error]wait for commit done returned -110 [ 52.175662] [drm:dpu_encoder_frame_done_timeout:2733] [dpu error]enc40 frame done timeout [ 55.351084] [drm:dpu_encoder_helper_report_irq_timeout [msm]] *ERROR* irq timeout id=40, intf_mode=INTF_MODE_VIDEO intf=5 wb=-1, pp=0, intr=0 " Another issue On Ubuntu with Gnome Desktop is: Display's connected with other DP ports are only showing backlight since login UI picked eDP panel connector which is not physically connected. > > > This series fixes the inaccurate hardware description by keeping the > > base DTBs limited to hardware common to both variants and moving the > > eDP-specific nodes into separate overlays. The base DTB can therefore > > be used for headless variants, while the overlay is selected for > > headed variants. > > -- > With best wishes > Dmitry