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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ba4517ec776sm1140081466b.16.2026.04.27.06.13.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Apr 2026 06:13:36 -0700 (PDT) Message-ID: Date: Mon, 27 Apr 2026 15:13:32 +0200 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 v2 1/6] clk: qcom: gdsc: Add custom disable callback for GX GDSC To: Taniya Das , Bjorn Andersson , Michael Turquette , Stephen Boyd , Abel Vesa , Rob Clark , Sean Paul , Konrad Dybcio , Akhil P Oommen , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Marijn Suijten , David Airlie , Simona Vetter Cc: Ajit Pandey , Imran Shaik , Jagadeesh Kona , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org References: <20260427-gfx-clk-fixes-v2-0-797e54b3d464@oss.qualcomm.com> <20260427-gfx-clk-fixes-v2-1-797e54b3d464@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260427-gfx-clk-fixes-v2-1-797e54b3d464@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI3MDE0MCBTYWx0ZWRfX6NqeJ5BmtnJl 9fQcI4v7OPvkus5l/LjlGzlqYBbhAp/XkxQRGl23lSKzXbohR6udw8C45IMNtadqtrqA9flWK+A GS081QGFjRXzVtnxvnG4NcXqxPlL0q3B483DbOe/gFCfdg/UP2GemydUiD4mAzs3dwgPEOb8kL4 kY0K1KkoDFzbhSO99kAjy6Gkbq7XagYafmTkuhdnOQZdhM48vqm0uUYbek18+q3spKO/0L17CHd pn3XajEYoDopgoYwdFldSEhwFoVC2+CMoXy5zqLR73lF1JGBo6AWBIBi+E0ldUkJxtTqe0CeqPm tXozkqan+A3EsywPpw7xTIvjzrJcAjrPFAnnsQxdDkE2jktmaiFgGvUo4EH/qB+yuo68A92hs8z fuQSVFweJmnfuCO/BUZ+Rx+8kgAmjzAia93W8Z2efK2WD4iKHsVCA8zV5y7sbeAaMQGTAHgq1xO dymbn3K6g++BWwi8LuQ== X-Authority-Analysis: v=2.4 cv=V69NF+ni c=1 sm=1 tr=0 ts=69ef6103 cx=c_pps a=wuOIiItHwq1biOnFUQQHKA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=aB4qEwVHbqlS5mOuu88A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=XD7yVLdPMpWraOa8Un9W:22 X-Proofpoint-GUID: oTBLOfpHcvggz0jg91JGbviljSCwkMd3 X-Proofpoint-ORIG-GUID: oTBLOfpHcvggz0jg91JGbviljSCwkMd3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-27_04,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 suspectscore=0 adultscore=0 spamscore=0 phishscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604270140 On 4/27/26 8:38 AM, Taniya Das wrote: > From: Jagadeesh Kona > > The GX GDSC is a special power domain that should only be disabled > by OS during GMU recovery. In all other scenarios, the GMU firmware > is responsible for handling its disable sequence, and OS must not > interfere. > > During the resume_noirq() phase of system resume, the GenPD framework > enables all power domains and later disables them in the complete() > phase if there are no active votes from OS. This behavior can > incorrectly disable the GX GDSC while the GMU firmware is still using > it. > > To prevent this, implement a custom disable callback for GX GDSC that > relies on GenPD’s synced_poweroff flag. The GMU driver sets this flag > only during recovery, allowing OS to explicitly disable GX GDSC in > hardware in that case. In all other situations, the disable callback > will avoid touching GX GDSC hardware. > > Signed-off-by: Jagadeesh Kona > Signed-off-by: Taniya Das > --- Reviewed-by: Konrad Dybcio Konrad