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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-kernel@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-GUID: ByvfxvXPEVOF3Va4JRbew6AIKGZ045Hc X-Authority-Analysis: v=2.4 cv=S83UAYsP c=1 sm=1 tr=0 ts=69a57b76 cx=c_pps a=UgVkIMxJMSkC9lv97toC5g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=plQLfFj-HSFRXCTsVOsA:9 a=QEXdDO2ut3YA:10 a=1HOtulTD9v-eNWfpl4qZ:22 X-Proofpoint-ORIG-GUID: ByvfxvXPEVOF3Va4JRbew6AIKGZ045Hc X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDA5OSBTYWx0ZWRfXxpAtI+hDIKdi ffuld5RV+H1oPQj12CY2zpsXktf/KBDx4KGFcFfDS2umRNF88p6eGymPTxf88gNjesR7+Z4f7QU 3HTimjzPEtAjnK5BAa/oQMjn8ilLHGlymRLAqZVZCyQHgfcvyla+4963Zk40usR63oaNKN5yfvR B6qMJFrlS6JmTxYzlDN3KIGiqF6VhIMd4eTOjuh0PUehJ7VTY3E1tkHEbhllfBq9+tWbrCqzdHv bHBA53b5cBdQJ+SLWOYOHbsZnE0g6gR4dP3TSvXVqxW4ll0NRVO32muc0gK49nVahSrnWSAXcgC rwYuyBGi/Vxyxpzbf4r4qawg65Dud5TQi0KdDm4DLNYBwoDj4esz0fElZfsaQ4pio0qzr+Z75nZ uPFJOzAwJYH97GNbBHIvrK5/2nwB6UHHQdwBcdPF6ObWuIOjeBliWxs/8LgHqBKAqZwizrDK0uD TJPvVFtyys4YzwsYWDg== 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 suspectscore=0 clxscore=1015 malwarescore=0 lowpriorityscore=0 adultscore=0 phishscore=0 spamscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 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