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Tue, 23 Jun 2026 04:31:53 -0700 (PDT) X-Received: by 2002:a05:6102:dcd:b0:631:2dc6:2f5c with SMTP id ada2fe7eead31-72a19f9bac9mr10458247137.0.1782214313240; Tue, 23 Jun 2026 04:31:53 -0700 (PDT) Received: from [192.168.1.110] ([178.197.218.240]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49249238bfbsm309629475e9.5.2026.06.23.04.31.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Jun 2026 04:31:52 -0700 (PDT) Message-ID: Date: Tue, 23 Jun 2026 13:31:49 +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] arm64: dts: qcom: eliza: Fix disp_cc_mdss_mdp_clk_src RCG stall on Eliza EVK To: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260623112755.317180-2-krzysztof.kozlowski@oss.qualcomm.com> From: Krzysztof Kozlowski Content-Language: en-US In-Reply-To: <20260623112755.317180-2-krzysztof.kozlowski@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjIzMDA5NCBTYWx0ZWRfXwouNmr+RNLnO YbdJuEjF/9v5UoJaN4mRE6AbuVhQzNlXRJyofckkKwiwVFbZYJfIbfg6IeXWmuKna7mdbIJ4/6r 471kFte72V/fruaiH5SeD0MdWzrMo/JsKIGRE0HpdvXglc4NAMTuWdBDmfTKYnPna/W9ezFASAD 6xGENuvWmNBiNbzlkWPaqjLmS2QChuDe/cULUf8NjZ9CoPPPOBUYJPqGf/G3PGfRBmsy5Vp4O7z g4tyc7h5JkUjMOkcQH/X4WIgx/rZKoSeplX6Abov05ni/X2GP1RRpkXi5DMhsyq4/hQKwJ0dczF TEpc615T7THeOO2eDGQmuLtYhpRM5/GkEX4TkYJlcy9psmnv4VofZta7XBP0I9yD/CDx+lS4DSt i9SYEjSBzE7qWFf58/LytTDozjQsZauddBr0qz9/PxUU7XrLBUbtbXHekSHhqdofzSxT6QWvESK OGTB4zb+gcFExg0a1XA== X-Proofpoint-GUID: SassMT1MZ3lPVOchcCzpMriNDKF65iw4 X-Authority-Analysis: v=2.4 cv=SoKgLvO0 c=1 sm=1 tr=0 ts=6a3a6eaa cx=c_pps a=P2rfLEam3zuxRRdjJWA2cw==:117 a=qMZSjPy+XpteAuilWfML4g==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yx91gb_oNiZeI1HMLzn7:22 a=EUspDBNiAAAA:8 a=pX4Y2oqsHS_uD1ZpdeUA:9 a=QEXdDO2ut3YA:10 a=ODZdjJIeia2B_SHc_B0f:22 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjIzMDA5NCBTYWx0ZWRfX9fNjreiFkAKT Ln0+gPcc8YvaOOhgX2qMMbdtJrirJRcJNFVrmpQUPZXIcZoqLniX5P+QSWnCuzHR9CF2ieJXpCl y4fXP5u3IEl6Z0KDzDvH8k7Gm72flzE= X-Proofpoint-ORIG-GUID: SassMT1MZ3lPVOchcCzpMriNDKF65iw4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-23_02,2026-06-23_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 spamscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 clxscore=1015 adultscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606230094 On 23/06/2026 13:27, Krzysztof Kozlowski wrote: > Eliza EVK (eliza-cqs-evk.dts) does not have display enabled, however its > Display Clock Controller is enabled and references parent clocks from > DSI PHYs. Devices which in base DTSI do not have all required resources > available (e.g. because they are simply disabled), should not be enabled > in the first place. > > Having DISPCC enabled without DSI PHYs causes clock reparenting issues > and warning on Eliza EVK: > > disp_cc_mdss_mdp_clk_src: rcg didn't update its configuration. > WARNING: drivers/clk/qcom/clk-rcg2.c:136 at update_config+0xd4/0xe4, CPU#1: udevd/273 > ... > update_config (drivers/clk/qcom/clk-rcg2.c:136 (discriminator 2)) (P) > clk_rcg2_shared_disable (drivers/clk/qcom/clk-rcg2.c:1471) > clk_rcg2_shared_init (drivers/clk/qcom/clk-rcg2.c:1540) > __clk_register (drivers/clk/clk.c:3959 drivers/clk/clk.c:4368) > devm_clk_hw_register (drivers/clk/clk.c:4448 (discriminator 1) drivers/clk/clk.c:4672 (discriminator 1)) > devm_clk_register_regmap (drivers/clk/qcom/clk-regmap.c:104) > qcom_cc_really_probe (drivers/clk/qcom/common.c:418) > qcom_cc_probe (drivers/clk/qcom/common.c:445) > disp_cc_eliza_probe (dispcc-eliza.c:?) dispcc_eliza > platform_probe (drivers/base/platform.c:1432) > > Signed-off-by: Krzysztof Kozlowski > --- > arch/arm64/boot/dts/qcom/eliza-mtp.dts | 4 ++++ > arch/arm64/boot/dts/qcom/eliza.dtsi | 1 + > 2 files changed, 5 insertions(+) I should call it RFC, because this feels like a band-aid and should be fixed in clock drivers maybe. Eventually DISPCC should be enabled on Eliza EVK for HDMI, but DSI PHY will stay disabled. Best regards, Krzysztof