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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b935a597d02sm468049066b.0.2026.03.02.04.45.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Mar 2026 04:45:41 -0800 (PST) Message-ID: Date: Mon, 2 Mar 2026 13:45:39 +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-Spam-Details-Enc: AW1haW4tMjYwMzAyMDEwNyBTYWx0ZWRfXxbR5O6J87LqD VD5hwXrLdb1lIj5aSudN4eDpJjDGTpuGmTzkfGBescXUjptYnFGkw16tnqVGmEAEnw0GtOYb8uN clo8VAcWXgHCsTuUwEOlqh/ZKRQ6zsfi1rhW3/a6VufKoi5WQKdKsIlJhR1jncGVJUcQWqxnVfC XrPv1OtYiJoztKn5DNeivc7H8yTilWrxP2JwxZ3l38ZE9qKaxxfagPxrFIr3QIbYGebSWBF4/Pq vlvl/0usnqzKg1Jp2Dw/Lh079rt9xyXZHxJbKQh22JHceOq78doazrxRzmhdKfE8nZBUGuVeBoT ubfKCGGuDuSB4vQfqNTCHtfp/5FKpTAkuuzCMadxmytOAZWk4qIJHhWvIY45PlngkdZ257EJ4qZ F5DTiOn1c5CE5um8TjmnGi6oXv9mBaq4CuaiaK2T8SlrtOHmK4CR1zUv+c7qPWZ1H/euQ/RYM6F T73LeulyXpvf14WAkfQ== X-Authority-Analysis: v=2.4 cv=TNhIilla c=1 sm=1 tr=0 ts=69a58677 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=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=TmkEJ0c5ACjQ8L-i1cIA:9 a=QEXdDO2ut3YA:10 a=1HOtulTD9v-eNWfpl4qZ:22 X-Proofpoint-ORIG-GUID: wRiXAZmrjjZCtzRFXVBKJ8S4EsKbBxSo X-Proofpoint-GUID: wRiXAZmrjjZCtzRFXVBKJ8S4EsKbBxSo 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-2603020107 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. > > 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. > > The missing features don't match the extra complexity required to > support two VBIF interfaces, so drop the second one and all the options > to support it. > > Signed-off-by: Dmitry Baryshkov > --- This leaves a trailing 'bool is_rt' in struct dpu_vbif_set_qos_params. I'm not sure whether/if we're going to use that specific set of functions with rotator support, but we should probably retain (and at some point recheck) the dpu_vbif_cfg->qos_nrt_tbl data that the catalog houses Konrad