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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b972de4847asm53985566b.21.2026.03.11.06.32.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 11 Mar 2026 06:32:44 -0700 (PDT) Message-ID: Date: Wed, 11 Mar 2026 14:32:42 +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] clk: qcom: dispcc-sc8280xp: Don't park mdp_clk_src at registration time To: Pengyu Luo Cc: Bjorn Andersson , Michael Turquette , Stephen Boyd , linux-arm-msm@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260303150152.90685-1-mitltlatltl@gmail.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: NPiHPYsyX1jXIqrG8iu-hbgTZezGbxk7 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzExMDExNCBTYWx0ZWRfX6S5Aiwtmb/6i 6j9o7mXCHKK0dLYlAe9zBpTKb8hTlliJ4Y8C/Qfo+4eTDZ8XCrHZTcGjDqfsA2OS3jAKdNOxrdd WKhSysnY6bVCFR9u8nmzDfp5/MTnuaLlJBdmOgAFQyzY0yJr5m6F7pyg6FwH9xtfT6nJWCv8iQS iMVoyg6txpH3MtWZTgfs2UkgghEX9K2mWkXpO1rKTobsxI3FibiU2w9yBp3Cz1Kz+wHFPro59MM l9WjTHI3LzSsfalOoq/gb2L5e98cUkJX2YtNKvy/AV553ul09DN2giZ7DfgbKEiJL3j1EG1jWfP 3Jo0VHYyFIX+/kbyr+RETr5+5wkUprQ+RxuSOinszDdI5s9V063q6VoPzhG7w88SeJwpQMpP2R2 0FxSTlkf+CGRQArSNH17o5PtrnrPPKgimceTBRjtzaiiAFhFRd70PG1bv2SgoaEO7exe56nC3rf F60J2hh6M5ynKc/RXVg== X-Authority-Analysis: v=2.4 cv=FMMWBuos c=1 sm=1 tr=0 ts=69b16efe cx=c_pps a=P2rfLEam3zuxRRdjJWA2cw==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=EUspDBNiAAAA:8 a=pPfQ2pD1zekkjLI5SAYA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ODZdjJIeia2B_SHc_B0f:22 X-Proofpoint-ORIG-GUID: NPiHPYsyX1jXIqrG8iu-hbgTZezGbxk7 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=2026-03-11_01,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 adultscore=0 clxscore=1015 impostorscore=0 suspectscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603110114 On 3/4/26 12:54 PM, Pengyu Luo wrote: > On Wed, Mar 4, 2026 at 7:20 PM Konrad Dybcio > wrote: >> >> On 3/3/26 4:01 PM, Pengyu Luo wrote: >>> Parking disp{0,1}_cc_mdss_mdp_clk_src clk broke simplefb on HUAWEI >>> Gaokun3, the image will stuck at grey for seconds until msm takes >>> over framebuffer. Use clk_rcg2_shared_no_init_park_ops to skip it. >> >> Do you have clk_ignore_unused/pd_ignore_unused in your cmdline? >> > > Yes, always. > >> The sc8280xp-huawei-gaokun3.dts references no clocks in the simplefb >> node, so if you're unlucky with timing, this is ""expected behavior"" >> > > On gaokun, if simplefb holds the mdp clk, there will not be the early > framebuffer, I can't see it. After seconds, msm initialized, the > display would show logs. I'm going to assume you don't have efifb. Is there a chance it's because simplefb is waiting for dispcc to probe, and by the time that happens, msm probes right away? i.e. it seems like something like https://lore.kernel.org/lkml/20220806163255.10404-1-markuss.broks@gmail.com/ would be better suited if you want to get logs early *and* you have a panel driver that works anyway > > Once I owned another sc8280xp device(Ntmer TW220 aka robo & kala), dsi > didn't work at that time, to bring up the simplefb, the clk must be > held and no parking. gaokun3 always requires no parking only. > > BTW, I can see this grey flash without simplefb too. On x13s, if > building msm as a module and not putting the module into the initial > ramdisk, what happens? Do you mean that in conjunction with dispcc-sc8280xp present in initramfs? Konrad