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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b734fb12c87sm1327055666b.31.2025.11.18.04.26.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 18 Nov 2025 04:26:19 -0800 (PST) Message-ID: <5c1948b7-aa3b-4c60-acf7-64a138450d57@oss.qualcomm.com> Date: Tue, 18 Nov 2025 13:26:17 +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 RFC] arm64: dts: qcom: sdm845: add framebuffer reserved memory To: david@ixit.cz, Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Casey Connolly References: <20251117-commonize-framebuffer-v1-1-e4c099b383c9@ixit.cz> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20251117-commonize-framebuffer-v1-1-e4c099b383c9@ixit.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTE4MDA5OSBTYWx0ZWRfX/1QwMCU85KhR 39jL/vOY56EU/zQWLObur/tecBDpCFErcU5TQlq+4Aig73DN9BSCchpK2xBWsHhBWFxDzPDQ0FO 4MxDW20t0DWNC+PXJmlSDLTjf232eMG1Jsfutqq6iMqx8a0UQQJXQUjbby0pphSq+MUn/SBBHTK PlW5tU17D+4p12O9k6D0C+xiHCTSJBvshhNOXVJpRnGd3xUT/f4RAPEAXEGsXflKEKYqX3HKZ8B LMV0a6rnQL1OyZkLRLdLimqjCnXKjUwvQUvNn1/JHdo36FcGIKvbSj8uoZBDmRqXaTWdabHdDsp oHoWOg0RJeRpQLn35xpIGOskT+4X3tnpXTrEp8u0auPYa6CtKlKIttQZjPPcxSZY90ZsXqBRls/ PrDKYZwJ7rovXHIpOrjIK6zcLAnz7w== X-Proofpoint-GUID: nAkncPB2JLt2TQuM53gcrwmOL-q9CzoA X-Proofpoint-ORIG-GUID: nAkncPB2JLt2TQuM53gcrwmOL-q9CzoA X-Authority-Analysis: v=2.4 cv=FtIIPmrq c=1 sm=1 tr=0 ts=691c65ed cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=KKAkSRfTAAAA:8 a=bYlG0dqZ5eHFlp2z8s0A:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 a=cvBusfyB2V15izCimMoJ:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-17_04,2025-11-13_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 priorityscore=1501 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511180099 On 11/17/25 1:27 PM, David Heidelberg via B4 Relay wrote: > From: Casey Connolly > > Stick it with the other default reserved regions, all sdm845 devices > use this address except for cheza. > > Signed-off-by: Casey Connolly > Signed-off-by: David Heidelberg > --- > What do you think about this proposed change? > > I assume QCOM recommends or by default use the default memory region, > but as can be seen on cheza or sdm850, it seems that vendor can customize > the region, thus it's not guranteed to have it always on the same address. > > There are two approaches I see: > 1. keep as is defined in each device-tree frambuffer node > 2. commonize frambuffer node to sdm845.dtsi and in case of exception > remove the node and definite it in device-tree. Generally this carveout is useful only if you use the bootloader- initiated framebuffer. Post that, drm/msm allocates its own Konrad