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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b935ab1552csm479120966b.13.2026.03.02.07.57.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Mar 2026 07:57:56 -0800 (PST) Message-ID: Date: Mon, 2 Mar 2026 16:57:52 +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: deliberations about the future of mdp5 (was: Re: [PATCH 1/2] drm/msm/dpu: fix mismatch between power and frequency) To: Dmitry Baryshkov Cc: yuanjiey , robin.clark@oss.qualcomm.com, lumag@kernel.org, abhinav.kumar@linux.dev, jesszhan0024@gmail.com, sean@poorly.run, marijn.suijten@somainline.org, airlied@gmail.com, simona@ffwll.ch, krzysztof.kozlowski@linaro.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, tingwei.zhang@oss.qualcomm.com, aiqun.yu@oss.qualcomm.com, yongxing.mou@oss.qualcomm.com, Stephan Gerhold , Nikita Travkin References: <4g6fyehdc3fejx3pzeysmghigazfei3jz2vmnvxrnqkkbtbxdb@bdlcddxlvbhl> <5wbvy257s553jyqzgqacfxhbeqgkrqui2yspqwjh2iyiz6ljoy@olo4l2kbrcjm> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <5wbvy257s553jyqzgqacfxhbeqgkrqui2yspqwjh2iyiz6ljoy@olo4l2kbrcjm> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDEzMyBTYWx0ZWRfX66ax5ViPjlic pyF7in/PKF4qkFUd1tNknASG6GYLUJR5pnUEkXn4xF5ls3VgBo845eo7Tv3Yt+/NXEWPuDehPI0 mhV3zisZ1yFnOz4fxqcpRscxEsC1c2je0HE2JNzRCh2DlcF3z5pl0D2iI4Q2yucddkCJ8QdKwW0 ICezr1DinTrEndklMPpF/gI7RlXlRHWSaMAaau2hr/agz1Ro4tugPNn8EZk51g2ouSmcGNmZ4mj Q6dk8VcnMlYKLwzszc2VYT+Noui1NS4wy3o3mq3AJk58hH6M8k8jee8H+LOjT9gAnoGXZFQevEz FZICTFY1iZxYNPR39rzSAV8JZ+bubGDwP/NqMHncdE3UeNEv6uUEPpkYLg5Rzns7grBJn3jT/oE IAZY7heNe7p1MkLuXZ+1tg75ckY0o5RkP2M22ClA6X2cl+zhY7TFVvMdfmvLTEVTSrXHa+mQQc0 5TMwSGnZzn1HlnIw/+A== X-Authority-Analysis: v=2.4 cv=TNhIilla c=1 sm=1 tr=0 ts=69a5b386 cx=c_pps a=qKBjSQ1v91RyAK45QCPf5w==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=xg0hYumib2hcNOQJ:21 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=pGLkceISAAAA:8 a=yKqxEvMnOuzkX6i4LBQA:9 a=QEXdDO2ut3YA:10 a=NFOGd7dJGGMPyQGDc5-O:22 X-Proofpoint-ORIG-GUID: RQ8id6RC2bHjZvfTVy4PTslmGJWcVas3 X-Proofpoint-GUID: RQ8id6RC2bHjZvfTVy4PTslmGJWcVas3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-02_03,2026-03-02_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 bulkscore=0 lowpriorityscore=0 malwarescore=0 spamscore=0 phishscore=0 suspectscore=0 impostorscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603020133 On 3/2/26 3:27 PM, Dmitry Baryshkov wrote: > On Mon, Mar 02, 2026 at 02:46:33PM +0100, Konrad Dybcio wrote: >> On 3/2/26 2:28 PM, Dmitry Baryshkov wrote: >>> On Mon, Mar 02, 2026 at 11:41:59AM +0100, Konrad Dybcio wrote: >>>> On 2/27/26 8:05 PM, Dmitry Baryshkov wrote: >>>>> On Fri, Feb 27, 2026 at 12:34:04PM +0100, Konrad Dybcio wrote: >>>>>> On 2/27/26 4:48 AM, Dmitry Baryshkov wrote: >>>>>>> On Thu, Feb 26, 2026 at 02:35:52PM +0100, Konrad Dybcio wrote: >>>>>>>> On 1/12/26 9:25 AM, yuanjiey wrote: >>>>>>>>> On Mon, Jan 12, 2026 at 09:38:41AM +0200, Dmitry Baryshkov wrote: >>>>>>>>>> On Mon, 12 Jan 2026 at 08:23, yuanjiey wrote: >>>>>>>>>>> >>>>>>>>>>> On Fri, Jan 09, 2026 at 05:22:37PM +0200, Dmitry Baryshkov wrote: >>>>>>>>>>>> On Fri, Jan 09, 2026 at 04:38:07PM +0800, yuanjie yang wrote: >>>>>>>>>>>>> From: Yuanjie Yang >> >> [...] >> >>> >>>> >>>>> 1.1 - MSM8x26 >>>>> Probably Luca can better comment on it. Should be doable, but I >>>>> don't see upstream devices using display on it. >>>> >>>> Because there's no iommu support for these >>> >>> I promised to put it on my todo list, but the list is very long. >>> >>>> >>>>> 1.2 - MSM8974 >>>>> I think it also had issues, no IOMMU support in upstream, etc. >>>>> 1.3 - APQ8084 >>>>> Had hw issues, no testing base, no MDSS in upstream DT >>>>> 1.6 - MSM8916 / MSM8939 >>>>> Can be done, low-hanging fruit for testing >>>>> 1.7 - MSM8996 >>>>> Supported in DPU >>>>> 1.8 - MSM8936 >>>>> No upsteram testing base >>>> >>>> 8936 is 39 with some CPUs fused off (unless you have info suggesting >>>> otherwise) >>> >>> Hmm, you added 8x36 to mdp5_cfg.c, stating it is 1.8. See commit >>> 81c4389e4835 ("drm/msm/mdp5: Add MDP5 configuration for MSM8x36.") >>> Author: Konrad Dybcio >>> >>> Please remove it from the mdp5_cfg to avoid confusion. >> >> v1.6 is strictly for 8916. 8936/39 both use v1.8. > > I tend to agree with you. It's interesting that core list doesn't (and > likely is wrong). > >> >>>>> 1.9 - MSM8994 >>>>> No upstream testing base, no MDSS in upstream DT, normal CURSOR planes >>>>> 1.10 - MSM8992 >>>>> Even less testing base, no MDSS in upstream DT, normal CURSOR planes >>>>> 1.11 - MSM8956 / 76 >>>>> No complete display configurations upstream >>>> >>>> +Marijn, is your computer museum still running? >>> >>> Should we open a Qualcomm Virtual Museum? >> >> Maybe someone has a drawer full of QSD8250s! > > Only APQ8060 here, but it's not even online after the reorg. > > Anyway, I assume that we have something alive and kicking for: > - 1.1, 8226 (currently unusable, no IOMMU) > - 1.2, 8974 (currently unusable, no IOMMU) > - 1.6, 8916 > - 1.8, 8939 > - 1.9, 8994 (almost dead, I'd say) > - 1.10, 8992 (almost dead, I'd say) My estimates for 8992/4 would be just a dozen or less enthusiasts, at most a couple dozen. The platform is in a tragic/borderline unsupported state upstream today and little effort has been seen to fix it, would probably need to come from us anyway, with essentially a re-bring-up.. Plus those have no IOMMU either (same camp as 74) and even if they did, I reckon any users would be happier to run the actually-maintained codebase. I think I may have a partially-ported 94 branch somewhere on some SSD.. Definitely more of a 'weekend project' type thing and shouldn't be considered a blocker. > - 1.11, 8956/76 > > It seems we can ignore (or drop) apq8084 (no activity since Dec 2019). > > Already in DPU: > - 1.7, 8996 > - 1.14, 8937 > - 1.15, 8917 > - 1.16, 8953 > > Which means: > - port 8916, copy for 8939 / 8956/76 and hope it works I suppose it's not a high priority for you. Maybe some 8916 enthusiast (+CC a couple) would like to try? (context: DPU1 support) Konrad > - add LM-cursor support > - deprecate mdp5, possibly moving it to EXPERT > - add 8226 / 8974 once we have IOMMU > - drop mdp5 >