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[68.46.10.116]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8caf9ee9fbasm978632285a.39.2026.02.09.21.40.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Feb 2026 21:40:58 -0800 (PST) From: Adam Ford To: linux-mediatek@lists.infradead.org Cc: angelogioacchino.delregno@collabora.com, Adam Ford , Michael Turquette , Stephen Boyd , Matthias Brugger , Ulf Hansson , Liam Girdwood , Mark Brown , Laura Nao , =?UTF-8?q?N=C3=ADcolas=20F=2E=20R=2E=20A=2E=20Prado?= , linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org Subject: [PATCH 4/5] regulator: mt6363: Fix interrmittent timeout Date: Mon, 9 Feb 2026 23:37:04 -0600 Message-ID: <20260210053708.17239-4-aford173@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260210053708.17239-1-aford173@gmail.com> References: <20260210053708.17239-1-aford173@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260209_214100_310072_698031EE X-CRM114-Status: GOOD ( 14.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Sometimes, the mt6363 regulator would fail to initialize and return with a TIMEOUT error, so add an extra instruction to wake up the bus before issuing the commands. Fixes: 3c36965df808 ("regulator: Add support for MediaTek MT6363 SPMI PMIC Regulators") Signed-off-by: Adam Ford --- drivers/regulator/mt6363-regulator.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/regulator/mt6363-regulator.c b/drivers/regulator/mt6363-regulator.c index e0fbf92e7685..03af5fa53600 100644 --- a/drivers/regulator/mt6363-regulator.c +++ b/drivers/regulator/mt6363-regulator.c @@ -861,7 +861,7 @@ static int mt6363_regulator_probe(struct platform_device *pdev) struct irq_domain *domain; struct irq_fwspec fwspec; struct spmi_device *sdev; - int i, ret; + int i, ret, val; config.regmap = mt6363_spmi_register_regmap(dev); if (IS_ERR(config.regmap)) @@ -870,6 +870,13 @@ static int mt6363_regulator_probe(struct platform_device *pdev) config.dev = dev; sdev = to_spmi_device(dev->parent); + /* + * The first read may fail if the bootloader sets sleep mode: wake up + * this PMIC with W/R on the SPMI bus and ignore the first result. + * This matches the MT6373 driver behavior. + */ + regmap_read(config.regmap, MT6363_TOP_TRAP, &val); + interrupt_parent = of_irq_find_parent(dev->of_node); if (!interrupt_parent) return dev_err_probe(dev, -EINVAL, "Cannot find IRQ parent\n"); -- 2.51.0