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Mon, 02 Mar 2026 00:43:35 -0800 (PST) X-Received: by 2002:a17:903:2352:b0:2ae:4a4e:1e25 with SMTP id d9443c01a7336-2ae4a4e1f37mr39247665ad.25.1772441014848; Mon, 02 Mar 2026 00:43:34 -0800 (PST) Received: from [10.206.99.28] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ae5276097asm23725485ad.34.2026.03.02.00.43.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Mar 2026 00:43:34 -0800 (PST) Message-ID: <9eb6d9a3-268b-4dee-9fab-ec59322e8a3b@oss.qualcomm.com> Date: Mon, 2 Mar 2026 14:13:26 +0530 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 00/18] accel/qda: Introduce Qualcomm DSP Accelerator driver To: Trilok Soni , Oded Gabbay , Jonathan Corbet , Shuah Khan , Joerg Roedel , Will Deacon , Robin Murphy , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= Cc: dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, iommu@lists.linux.dev, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, Srinivas Kandagatla , Dmitry Baryshkov , Bharath Kumar , Chenna Kesava Raju References: <20260224-qda-firstpost-v1-0-fe46a9c1a046@oss.qualcomm.com> Content-Language: en-US From: Ekansh Gupta In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: 1go5Fk_WaSPHT-oGydDRQtzFxuS46wbP X-Proofpoint-GUID: 1go5Fk_WaSPHT-oGydDRQtzFxuS46wbP X-Authority-Analysis: v=2.4 cv=FaA6BZ+6 c=1 sm=1 tr=0 ts=69a54db8 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=AnEmtbbmQWdTvrL9bUcA:9 a=QEXdDO2ut3YA:10 a=0lgtpPvCYYIA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDA3NiBTYWx0ZWRfXzNsdGrE6Qy5g 0qsXXRbvfHZ6H5YBRleRibE9wO1Y7Gl6VVqmWmj6AM7CJz4KYFHrHCNjCfh2c+bbtEhUTcdURD9 gwyjL3hEAZfIS+HuSQXVDtM7PjCPxOUfWpRX2iy8yKKLkhiUx0fUVVlccYE/DbpYHPtqiG6nvq8 LJh+hPiaSnA3rsc4vQ4ksjXBrNZTuUM69s1hP4Beq4NXbxqlgon4ov0DMR+5CcD6w5sFLLRJ/nU zS4hg+viSTUSFhyNk04+XeZnt/nxH+GMnVC3RjMm6vHKg8lpIhfyOg3bDzyl3kmALrIMEuaG5R2 63kfiSYXbHGCy2ms8RVm23NPV289/JULTSOmKO9Wm0nrnHq5ctNMoqSEXxvK1r1mypHEOLf3eHQ 4UDTmZcV6pfNNLo56ZGNCNdQYCHR0nirHh2V1Vu8McOPUBql+EoDkryZn5lZMUMsMXw4jwt5u3o HpjznDLK9MRL4dVcWXw== 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_02,2026-02-27_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 bulkscore=0 adultscore=0 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603020076 On 2/24/2026 9:09 AM, Trilok Soni wrote: > On 2/23/2026 11:08 AM, Ekansh Gupta wrote: >> * Userspace Interface: While the driver provides a new DRM-based UAPI, >> the underlying FastRPC protocol and DSP firmware interface remain >> compatible. This ensures that DSP firmware and libraries continue to >> work without modification. > > This is not very clear and it is not explained properly in the 1st patch > where you document this driver. It doesn't talk about how older > UAPI based application will still work without any change > or recompilation. I prefer the same old binary to work w/ the new > DRM based interface without any changes (I don't know how that will be possible) > OR if recompilation + linking is needed then you need to provide the wrapper library. I'll add more details for this based on the discussion for compat driver. > > ---Trilok Soni