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[144.178.202.142]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6b7c1e49be0sm968246a12.0.2026.11.13.05.27.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Nov 2026 05:27:03 -0800 (PST) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Fri, 13 Nov 2026 14:27:01 +0100 Message-Id: From: "Luca Weiss" To: "Val Packett" , "Luca Weiss" , "Bjorn Andersson" , "Konrad Dybcio" , "Abel Vesa" , "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "Dmitry Baryshkov" Cc: <~postmarketos/upstreaming@lists.sr.ht>, , , , Subject: Re: [PATCH 4/4] arm64: dts: qcom: sm7225-fairphone-fp4: Wire up PM6150L LCDB X-Mailer: aerc 0.22.0-0-gc2f86b7abde3-dirty References: <20261113-lcdb-enablement-v1-0-1dc40b49ed82@fairphone.com> <20261113-lcdb-enablement-v1-4-1dc40b49ed82@fairphone.com> In-Reply-To: On Fri Nov 13, 2026 at 2:09 PM CET, Val Packett wrote: > > On 11/13/26 9:59 AM, Luca Weiss wrote: >> On Fri Nov 13, 2026 at 9:16 AM CET, Luca Weiss wrote: >>> Since Linux has gained LCDB support now, wire up the LCDB regulators so >>> we can turn them off and on as desired. >> Actually after some more testing with extra patches, it seems that on >> FP4 the touchscreen stays dead after toggling the lcdb regulator, while >> on FP3 it works perfectly fine. >> >> So please ignore this specific patch for now, I will figure out what the >> problem is and re-submit. All the other patches in the series are still >> good to go in! > > Your touchscreen needs to be a drm panel follower and/or reference the=20 > same supplies as well :) Most modern touch controllers are part of the=20 > same physical DDIC as the actual display side Yep, I assumed the same. Probably need to resend the init sequence [0] after power cycle, when the panel is back on again, to get everything running again. [0] https://lore.kernel.org/linux-arm-msm/20260821-fp4-hx83112a-v1-2-474941= bd8860@fairphone.com/ hx83112a_init() Fairphone 3 should be a similar setup (FP3: hx83112b, FP4: hx83112a) but apparently the hx83112b doesn't need any sort of init to start sending touch inputs compared to hx83112a. Regards Luca