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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b935ae60c16sm461969766b.38.2026.03.02.03.58.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Mar 2026 03:58:44 -0800 (PST) Message-ID: <385d044c-29ef-44c2-9faa-0c306af44772@oss.qualcomm.com> Date: Mon, 2 Mar 2026 12:58:42 +0100 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 0/7] drm/msm/dpu: simplify VBIF handling To: Dmitry Baryshkov , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20260227-drop-vbif-nrt-v1-0-2b97d0438182@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260227-drop-vbif-nrt-v1-0-2b97d0438182@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDA5OSBTYWx0ZWRfX7e6j8kXPSi8+ jPZbZ5TvuV3p82+rwDFylhdyWmVCU1CA0xcna5mbyc5JsoOyZuLnMoS0bytHxabQNt6vNSfNn1i oClolbt1hEpqE+X3Cnf0oqcRAQFRGEmQYQOOms6ttfx4/QGStz44C1pe7UKgDEj4BlTjmK0pG7R wGA645y3k2vkmvhPkx2Zp/yqIUNZe62MoI4uVArAj34eesJcf5biPtmEcfJRJLxwUSROnzs+GmA nhUHnLB4qglCXGHCPZYjepo/csZunTsCanvU/JMEQ14gUQ63EhHIIaIF7kDfkIYL6hebYpNWiLI gSolcyDga+JwwU8sSqRXvAPUcZ/1Vo1xdaWl7b1j/zeR/rVIHG0XkK4jz4GBdUbYknkQ8JGSj5R Q1m1LSu0yVkRTZxmrPG1eG3Rhon1pQWW/Jeey5ICcUb93TFiVL6X5ZQl9gEPta/m0xEIv8wesxY pRS2aMAr2XVJUvnAXxQ== X-Authority-Analysis: v=2.4 cv=TNhIilla c=1 sm=1 tr=0 ts=69a57b76 cx=c_pps a=HLyN3IcIa5EE8TELMZ618Q==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=plQLfFj-HSFRXCTsVOsA:9 a=QEXdDO2ut3YA:10 a=bTQJ7kPSJx9SKPbeHEYW:22 X-Proofpoint-ORIG-GUID: yxpuHJCE5Db5pwvGstIxMc7LPy61npfC X-Proofpoint-GUID: yxpuHJCE5Db5pwvGstIxMc7LPy61npfC 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_03,2026-02-27_03,2025-10-01_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-2603020099 On 2/27/26 7:36 PM, Dmitry Baryshkov wrote: > Once Konrad asked, what is the use for VBIF_NRT. Answering to his > question revealed that it's not actually used by the DPU driver. > > There are two VBIF interfaces two memory, VBIF_RT and VBIF_NRT with > VBIF_NRT being used only for the offscreen rotator, a separate block > performing writeback operation with the optional 90 degree rotation. > This block will require a separate isntance of the DPU driver, and it is > not supported at this point. (in case someone interested is reading this - patches welcome!) > The only exception to that rule is MSM8996, where VBIF_NRT has also been > used for outputting all writeback data. The DPU driver don't support WB > on that platform and most likely will not in the close feature. Unfortunately, it seems that way. Fortunately, it seems like it's indeed isolated to MSM8996. This patchset is tearing out a lot of abstraction (which would only be useful for that SoC though) - if someone decides to work on it, do you think this should be effectively reverted, or should the NRT VBIF be instantiated in some other, more locallized way? Konrad