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Wed, 19 Aug 2026 07:40:31 -0700 (PDT) X-Received: by 2002:a05:622a:2cd:b0:52d:9a83:4187 with SMTP id d75a77b69052e-52dd4dcf390mr38627581cf.0.1787150431215; Wed, 19 Aug 2026 07:40:31 -0700 (PDT) Received: from [192.168.120.193] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c243c38b029sm86575866b.47.2026.08.19.07.40.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Aug 2026 07:40:30 -0700 (PDT) Message-ID: Date: Wed, 19 Aug 2026 16:40:27 +0200 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/15] accel/qda: Qualcomm DSP Accelerator driver To: rob.clark@oss.qualcomm.com, Krzysztof Kozlowski Cc: Ekansh Gupta , Oded Gabbay , Jonathan Corbet , Shuah Khan , Randy Dunlap , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Bharath Kumar , Chenna Kesava Raju , srinivas.kandagatla@oss.qualcomm.com, dmitry.baryshkov@oss.qualcomm.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-arm-msm@vger.kernel.org, llvm@lists.linux.dev, iommu@lists.linux.dev, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org References: <20260817-qda-v2-v2-0-69a02e9090d4@oss.qualcomm.com> <3322b42b-3755-45ec-ad55-345125f0d488@kernel.org> <10349e29-b583-403f-a89a-9a00c73666bc@oss.qualcomm.com> <87dca76c-851e-4cc3-ab91-68949d283b79@kernel.org> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwODE5MDExNCBTYWx0ZWRfXxTNSbMl03sab 0bnwQnsovGnO/jTJtkeicWMggcx7byYVgIQHOqIvYfYKvntu83Rx8gmenvXJ/NL7SfKPg7jjtV1 83iZsW9L6bPkXDIGWmLgAYx9CMby/wQ= X-Authority-Analysis: v=2.4 cv=H5PrBeYi c=1 sm=1 tr=0 ts=6a85c060 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=DxY1U69r6NhVaGGOtf0A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 X-Proofpoint-ORIG-GUID: phRwayhB-jehFujYVDWieP4MuLFUDPqk X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE5MDExNCBTYWx0ZWRfX2MCYtdUrwcn2 Dh2hG4mog/OlXjCZ21ZHr5uRdMt0P6IhII9+VkiRWH1gJl3D/yq182Gw0hfswkuMYcAUHMUK/oB GwSxS5U0lnU0O2BWx7EmgNd91jNmYkeIo6s2A8pqLOKK/2O7EjsFx6bQDx11BxdonzWbJ8JeTY9 WU9sRc8rSxYJwMdJlyFst5qbf5RmtzSYBF0RL4i+BDGS6jebvNSLrLoTe3c6t/WqaXR1pzaq6Vk nZxbnm2QLfd1UwDt6gbdiuYZSZvgmfR2mmzS1QgYnd6eMb2mVH0DI4/81qvZDKTZ2qseVT8O+8d DgC6IhKqiiGLdeQF9B4NZrjeGRkFaB02mXbgE4VTNDJk+Oi+VOnIH2sBpApnmqgdYhsVYHPkw9/ RWWT0ip3BVU+g5T8VBzC1MrdP9otVQIgCIz7h9CLDyp44Puolm4UIszGq5GUGz+pQmMmvq8f4c1 YXxR4xaR1lykpON0rTg== X-Proofpoint-GUID: phRwayhB-jehFujYVDWieP4MuLFUDPqk 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=2026-08-19_04,2026-08-19_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 priorityscore=1501 bulkscore=0 impostorscore=0 adultscore=0 suspectscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608190114 On 8/19/26 4:38 PM, Rob Clark wrote: > On Wed, Aug 19, 2026 at 7:21 AM Krzysztof Kozlowski wrote: >> >> On 19/08/2026 15:26, Ekansh Gupta wrote: >>> On 19-08-2026 00:43, Krzysztof Kozlowski wrote: >>>> On 17/08/2026 06:47, Ekansh Gupta wrote: >>>>> This patch series introduces the Qualcomm DSP Accelerator (QDA) driver, >>>>> a DRM-based accelerator driver for Qualcomm DSPs. The driver provides a >>>>> standardized interface for offloading computational tasks to DSPs found >>>>> on Qualcomm SoCs, supporting all DSP domains. >>>>> >>>>> The QDA driver implements the FastRPC protocol over the DRM accel >>>>> subsystem. It uses the same device-tree node structure as the existing >>>>> fastrpc driver in drivers/misc/. The approach for binding the QDA driver >>>>> to device-tree nodes while coexisting with the fastrpc driver is an open >>>>> item described below. >>>> >>>> No. Grow/replace/improve existing driver instead of coming with a duplicate. >>>> >>>> That's a standard upstream requirement, basically given on every >>>> upstreaming guide. >>>> >>>> Please watch old talk from Greg - "I Don’t Want Your Code!". >>> Posted discussion threads here[1]. Would seek comments from Dmitry, >>> Srini as well. >>> >>> [1] >>> https://lore.kernel.org/all/3476b5c3-7983-4994-a901-3d7d8bd75255@oss.qualcomm.com/ >> >> The rest of the comments is still valid even if you did not acknowledge >> them. >> >> Anyway, regarding above - again, watch the talk from Greg. >> >> You have ONE driver. Not two. > > Long term, moving to the common driver framework (which did not exist > when fastrpc was first created) seems like a good thing. But does > that not allow for some transition period? How can we get from here > to there without otherwise breaking userspace? Is there some other > precedent elsewhere in other driver subsystems? > > I suppose drm exposing legacy fbdev on top of drm drivers is _sort of_ > a precedent if you squint a bit? I'm not really familiar enough to > say if that would be reasonable/possible in this case. Also, venus/iris, mdp5/dpu1 Konrad