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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-672c4d69708sm7043728a12.28.2026.04.27.06.14.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Apr 2026 06:14:33 -0700 (PDT) Message-ID: <0314b78c-cd96-473e-aad8-6977b47cf1f0@oss.qualcomm.com> Date: Mon, 27 Apr 2026 15:14:30 +0200 Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/6] clk: qcom: gxclkctl: Remove GX/GMxC rail votes to align with IFPC 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-v2-4-797e54b3d464@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260427-gfx-clk-fixes-v2-4-797e54b3d464@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=aqCCzyZV c=1 sm=1 tr=0 ts=69ef613b cx=c_pps a=1Os3MKEOqt8YzSjcPV0cFA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=IGZpXzwkV2I0bIdW4VsA:9 a=QEXdDO2ut3YA:10 a=hhpmQAJR8DioWGSBphRh:22 X-Proofpoint-GUID: FTB9XyCxpbA7UsMP1f-LhWMqYQ21AwXp X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI3MDE0MCBTYWx0ZWRfXybyv6XWepU94 Q3dw8GbGKbqhBlzgr1OER2rlVgOH41waukYnL7yTBE0RBneixZraimEIzMVWJcdfNnJAIbxiOW2 ouYVuaqSjTHzvjp5N4njLPmIX15pHAd2GUvvArHt/FjGW2/ohUqEWfNuur+3WbnoYJsNuiKcrp/ mFW24Ul5dn3b1wKUj2rJ/lAeGuRF0oP/t5mjQzRa6RWOc9gf0acjo3VhrVCpI5d3Q8E9gwlPtje WhjEUtSsJwA2iIvUCHdmsXKpUAoWQkawp4hIOo3oo3OYn6cBoU532s/V62HvwE25nP8VRzWqei5 e3nDHRX5gLc+dlFVHlDcBymcmDbraaY6bzfL+YuZgpPdvI0sQvsli9NPDD8HpTQIszmxzbqumRC Irtv9VpEbcWOu7jD84CHOLCiukTDPLwZuFnr7uzMUKSBk+ypKgETVIgdOmMC7AfVVV+YaCsDk+D ShdXWTmGBHGBiv9+ZTg== X-Proofpoint-ORIG-GUID: FTB9XyCxpbA7UsMP1f-LhWMqYQ21AwXp 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 priorityscore=1501 impostorscore=0 phishscore=0 spamscore=0 adultscore=0 suspectscore=0 malwarescore=0 bulkscore=0 clxscore=1015 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: > The GX GDSC control is handled through a dedicated clock controller, > and the enable/disable sequencing depends on correct rail voting. > The driver votes for the GX/GMxC rails and CX GDSC before toggling > the GX GDSC. Currently, during GMU runtime PM resume, rails remain > enabled due to upstream votes propagated via RPM-enabled devlinks > and explicit pm_runtime votes on GX GDSC. > > This is not an expected behaviour of IFPC(Inter Frame Power Collapse) > requirements of GPU as GMU firmware is expected to control these rails, > except during the GPU/GMU recovery via the OS and that is where the GX > GDSC should be voting for the rails (GX/GMxC and CX GDSC) before > toggling the GX GDSC. > > Thus, disable runtime PM after successfully registering the clock > controller. > > Signed-off-by: Taniya Das > --- Reviewed-by: Konrad Dybcio Konrad