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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5d99046ddabsm573823a12.68.2025.01.09.05.18.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jan 2025 05:18:35 -0800 (PST) Message-ID: Date: Thu, 9 Jan 2025 14:18:31 +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 v4 4/7] drm/msm/adreno: Add module param to disable ACD To: Akhil P Oommen , Rob Clark , Sean Paul , Konrad Dybcio , Abhinav Kumar , Dmitry Baryshkov , Marijn Suijten , David Airlie , Simona Vetter , Viresh Kumar , Nishanth Menon , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Maya Matuszczyk Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org References: <20250109-gpu-acd-v4-0-08a5efaf4a23@quicinc.com> <20250109-gpu-acd-v4-4-08a5efaf4a23@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20250109-gpu-acd-v4-4-08a5efaf4a23@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: r1TkXYychh76mY0d7tsDCTidBdIP-ai_ X-Proofpoint-ORIG-GUID: r1TkXYychh76mY0d7tsDCTidBdIP-ai_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 bulkscore=0 mlxlogscore=999 clxscore=1015 priorityscore=1501 lowpriorityscore=0 malwarescore=0 mlxscore=0 spamscore=0 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501090105 On 8.01.2025 9:40 PM, Akhil P Oommen wrote: > Add a module param to disable ACD which will help to quickly rule it > out for any GPU issues. > > Signed-off-by: Akhil P Oommen > --- > drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 7 +++++++ > drivers/gpu/drm/msm/adreno/adreno_device.c | 4 ++++ > 2 files changed, 11 insertions(+) > > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c > index 1f213a0fc61b..ce08eed572c8 100644 > --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c > @@ -1475,6 +1475,13 @@ static int a6xx_gmu_acd_probe(struct a6xx_gmu *gmu) > struct adreno_gpu *adreno_gpu = &a6xx_gpu->base; > struct msm_gpu *gpu = &adreno_gpu->base; > int ret, i, cmd_idx = 0; > + extern bool disable_acd; > + > + /* Skip ACD probe if requested via module param */ > + if (disable_acd) { > + DRM_DEV_ERROR(gmu->dev, "Skipping GPU ACD probe\n"); > + return 0; > + } > > cmd->version = 1; > cmd->stride = 1; > diff --git a/drivers/gpu/drm/msm/adreno/adreno_device.c b/drivers/gpu/drm/msm/adreno/adreno_device.c > index 236b25c094cd..f4552b8c6767 100644 > --- a/drivers/gpu/drm/msm/adreno/adreno_device.c > +++ b/drivers/gpu/drm/msm/adreno/adreno_device.c > @@ -24,6 +24,10 @@ int enable_preemption = -1; > MODULE_PARM_DESC(enable_preemption, "Enable preemption (A7xx only) (1=on , 0=disable, -1=auto (default))"); > module_param(enable_preemption, int, 0600); > > +bool disable_acd; > +MODULE_PARM_DESC(disable_acd, "Forcefully disable GPU ACD"); > +module_param_unsafe(disable_acd, bool, 0600); IIUC 0600 makes it sysfs-writeable, which we don't want, as it takes effect during probe (meaning booting with =0 and writing 1 later on has no effect) Konrad