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Mon, 26 Oct 2026 02:13:39 -0700 (PDT) Received: from [192.168.226.26] ([178.235.128.140]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c46bd66bd3asm295841466b.56.2026.10.26.02.13.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 26 Oct 2026 02:13:38 -0700 (PDT) Message-ID: Date: Mon, 26 Oct 2026 10:13:34 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 05/10] drm/msm/dpu: clear the CWB blocks left by a previous reservation To: Dmitry Baryshkov , Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Antonino Maniscalco , Kalyan Thota , Federico Amedeo Izzo , Helen Koike , Vignesh Raman , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20261024-fd-kms-fix-smmu-v5-0-a5b0b284aead@oss.qualcomm.com> <20261024-fd-kms-fix-smmu-v5-5-a5b0b284aead@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20261024-fd-kms-fix-smmu-v5-5-a5b0b284aead@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=G7GJgNk5 c=1 sm=1 tr=0 ts=6adf19c4 cx=c_pps a=wEM5vcRIz55oU/E2lInRtA==:117 a=PRfkaYvzSr8QmIIGAkY2Sg==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=xIhFS8ZktLuDZ2I-VrQA:9 a=QEXdDO2ut3YA:10 a=OIgjcC2v60KrkQgK7BGD:22 X-Proofpoint-ORIG-GUID: VgdhQ6ocfIMwQHzmTlesfI1_BEMQGm8m X-Proofpoint-Spam-Info: AW1haW4tMjYxMDI2MDAzNiBTYWx0ZWRfX6a5iIc0T9jFu 5OEa/Pb6rxM7gqpcEJ6vk1MeBVeTau75bkHrPrAzOqsMzh0mhyKYMjzjXLqw5ep+sOEmog+xLE/ 8GTAThQ0FOcYg0f7ueu+P/XypllT4qA= X-Proofpoint-GUID: VgdhQ6ocfIMwQHzmTlesfI1_BEMQGm8m X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDI2MDAzNiBTYWx0ZWRfX9JThoNp79CWt MXiBYFHHyd3TCoyi9r0BBcHWu6dh06JZr0JQ51tVq/tL8unnHksPx1ML9z5x1sp1CkYmUG9BphA 7MCFFCAFYNUXshPSMpaIqXx384uF6hPX6B/I4HIC/GONM0RpyijxS8ITQnOjE45zsE2BPpP/+Ja /poVtv/FqD+ChSpUT+Z94BNWxvUmbk+vv1b6aVvfGNIgyPOsr6ro/0PRFqifrdlTCPXqf4OYcym ewgCrz6y+H9XkgOZ7nzatPCE4NNUDjdG6rn+Xwykq2UGbhX5Bk7zR88B5AiXQ2txaqYYv0CMtgK v5t66kCYvI/fGO3BgJ9ThV09rfuFOGZLlwQxCNdyZGDcgCRoRcVuhbPKUAzor/mCQOBnb50hz72 zRx39XRDCjSdVfTUgLyINBlbQHvoDjKjaX4F7O9r/EUeKjeOP87tfY2i0y1TfNPjMphfTNsPtoN WhUIUK4hC9ia5k/ldmw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-10-26_01,2026-10-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 priorityscore=1501 suspectscore=0 bulkscore=0 phishscore=0 spamscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610190000 definitions=main-2610260036 On 10/24/26 1:25 AM, Dmitry Baryshkov wrote: > dpu_encoder_virt_atomic_mode_set() only writes the first num_cwb entries > of dpu_enc->hw_cwb[], and not at all when the encoder is not the > writeback of a clone, so a modeset which drops the clone, or reserves > fewer CWB blocks, keeps the pointers from the previous reservation. > dpu_encoder_helper_phys_setup_cwb() then walks every non-NULL entry: it > programs a CWB mux the crtc no longer owns, and looks its pingpong up past > the pingpongs actually assigned, in the uninitialised part of rt_pp_list[]. > > Store NULL for the entries which have no CWB block, as is done for the > pingpongs. > > Fixes: 5008375443ed ("drm/msm/dpu: Reserve resources for CWB") > Assisted-by: LLM > Signed-off-by: Dmitry Baryshkov > --- Acked-by: Konrad Dybcio Konrad