From patchwork Sat Jan 9 13:29:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 12008291 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5864BC433E9 for ; Sat, 9 Jan 2021 13:31:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 264C923A60 for ; Sat, 9 Jan 2021 13:31:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726511AbhAINb0 (ORCPT ); Sat, 9 Jan 2021 08:31:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32822 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726523AbhAINb0 (ORCPT ); Sat, 9 Jan 2021 08:31:26 -0500 Received: from relay03.th.seeweb.it (relay03.th.seeweb.it [IPv6:2001:4b7a:2000:18::164]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60855C061786 for ; Sat, 9 Jan 2021 05:30:42 -0800 (PST) Received: from IcarusMOD.eternityproject.eu (unknown [2.237.20.237]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by m-r1.th.seeweb.it (Postfix) with ESMTPSA id A3A781F557; Sat, 9 Jan 2021 14:29:43 +0100 (CET) From: AngeloGioacchino Del Regno To: linux-arm-msm@vger.kernel.org Cc: agross@kernel.org, bjorn.andersson@linaro.org, lgirdwood@gmail.com, broonie@kernel.org, robh+dt@kernel.org, sumit.semwal@linaro.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, phone-devel@vger.kernel.org, konrad.dybcio@somainline.org, marijn.suijten@somainline.org, martin.botka@somainline.org, AngeloGioacchino Del Regno Subject: [PATCH 0/7] Really implement Qualcomm LAB/IBB regulators Date: Sat, 9 Jan 2021 14:29:14 +0100 Message-Id: <20210109132921.140932-1-angelogioacchino.delregno@somainline.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Okay, the title may be a little "aggressive"? However, the qcom-labibb driver wasn't really .. doing much. The current form of this driver is only taking care of enabling or disabling the regulators, which is pretty useless if they were not pre-set from the bootloader, which sets them only if continuous splash is enabled. Moreover, some bootloaders are setting a higher voltage and/or a higher current limit compared to what's actually required by the attached hardware (which is, in 99.9% of the cases, a display) and this produces a higher power consumption, higher heat output and a risk of actually burning the display if kept up for a very long time: for example, this is true on at least some Sony Xperia MSM8998 (Yoshino platform) and especially on some Sony Xperia SDM845 (Tama platform) smartphones. In any case, the main reason why this change was necessary for us is that, during the bringup of Sony Xperia MSM8998 phones, we had an issue with the bootloader not turning on the display and not setting the lab and ibb regulators before booting the kernel, making it impossible to powerup the display. With this said, this patchset enables setting voltage, current limiting, overcurrent and short-circuit protection.. and others, on the LAB/IBB regulators. Each commit in this patch series provides as many informations as possible about what's going on and testing methodology. AngeloGioacchino Del Regno (7): regulator: qcom-labibb: Implement voltage selector ops regulator: qcom-labibb: Implement current limiting regulator: qcom-labibb: Implement pull-down, softstart, active discharge dt-bindings: regulator: qcom-labibb: Document soft start properties regulator: qcom-labibb: Implement short-circuit and over-current IRQs dt-bindings: regulator: qcom-labibb: Document SCP/OCP interrupts arm64: dts: pmi8998: Add the right interrupts for LAB/IBB SCP and OCP .../regulator/qcom-labibb-regulator.yaml | 28 +- arch/arm64/boot/dts/qcom/pmi8998.dtsi | 8 +- drivers/regulator/qcom-labibb-regulator.c | 636 +++++++++++++++++- 3 files changed, 660 insertions(+), 12 deletions(-)