From patchwork Wed Jan 27 17:11:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Hunter X-Patchwork-Id: 12050597 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 70765C4332B for ; Wed, 27 Jan 2021 17:14:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2BF3164DA0 for ; Wed, 27 Jan 2021 17:14:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234286AbhA0ROK (ORCPT ); Wed, 27 Jan 2021 12:14:10 -0500 Received: from hqnvemgate25.nvidia.com ([216.228.121.64]:17623 "EHLO hqnvemgate25.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234152AbhA0RMJ (ORCPT ); Wed, 27 Jan 2021 12:12:09 -0500 Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Wed, 27 Jan 2021 09:11:25 -0800 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 27 Jan 2021 17:11:25 +0000 Received: from moonraker.nvidia.com (172.20.145.6) by mail.nvidia.com (172.20.187.15) with Microsoft SMTP Server id 15.0.1473.3 via Frontend Transport; Wed, 27 Jan 2021 17:11:23 +0000 From: Jon Hunter To: Peter De Schrijver , Michael Turquette , Stephen Boyd , Thierry Reding CC: , , Jon Hunter Subject: [PATCH] clk: tegra: clk-dfll: Verify regulator vsel values are valid Date: Wed, 27 Jan 2021 17:11:21 +0000 Message-ID: <20210127171121.322765-1-jonathanh@nvidia.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1611767485; bh=URvrDgporW+3OSixaQLjcd3wnqEV05uMiHjiwxC8n7k=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:MIME-Version: X-NVConfidentiality:Content-Transfer-Encoding:Content-Type; b=KY6QDP5aT4GsdCRoRbs+l6wWM3bN7wS0V/Q+hJ/fu2VLuQfqkdf4RRNyEX3JO+6uI gRVsKAqaF0is0XZjxyGB3ysoDMdUQ+HdocV68CS9nRDntpO1DvyY+eTUmAIe3DWqxr Juzwcs5clENVxwvGh5Za5LHwbER5u2lJ09Unkp46ap+jEY5vI+PKqlthgbuHXYBvi0 wkMj7YwKWkth5fa3fRo1rE9nEst0O0HFblRaNFh/BOjVLF/MOCVOC1aZVy0iIc9Ww7 4SH2OYIC2EJ/sWdEowe6pKSzo6j1LgNvmo5EulGNQq0Cyu3++ij25y1KugaGIlTTw7 vIaYCDl+C0PUg== Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The regulator function, regulator_list_hardware_vsel(), may return an negative error code on failure. The Tegra DFLL driver does not check to see if the value returned by this function is an error. Fix this by updating the DFLL driver to check if the value returned by regulator_list_hardware_vsel() is an error and if an error does occur propagate the error. Signed-off-by: Jon Hunter Acked-by: Thierry Reding --- drivers/clk/tegra/clk-dfll.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-) diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c index a5f526bb0483..709fb1fe7073 100644 --- a/drivers/clk/tegra/clk-dfll.c +++ b/drivers/clk/tegra/clk-dfll.c @@ -672,10 +672,9 @@ static int dfll_force_output(struct tegra_dfll *td, unsigned int out_sel) * Load the voltage-to-PMIC register value lookup table into the DFLL * IP block memory. Look-up tables can be loaded at any time. */ -static void dfll_load_i2c_lut(struct tegra_dfll *td) +static int dfll_load_i2c_lut(struct tegra_dfll *td) { - int i, lut_index; - u32 val; + int i, lut_index, val; for (i = 0; i < MAX_DFLL_VOLTAGES; i++) { if (i < td->lut_min) @@ -687,10 +686,15 @@ static void dfll_load_i2c_lut(struct tegra_dfll *td) val = regulator_list_hardware_vsel(td->vdd_reg, td->lut[lut_index]); + if (val < 0) + return val; + __raw_writel(val, td->lut_base + i * 4); } dfll_i2c_wmb(td); + + return 0; } /** @@ -737,9 +741,10 @@ static void dfll_init_i2c_if(struct tegra_dfll *td) * disable the I2C command output to the PMIC, set safe voltage and * output limits, and disable and clear limit interrupts. */ -static void dfll_init_out_if(struct tegra_dfll *td) +static int dfll_init_out_if(struct tegra_dfll *td) { u32 val; + int ret; td->lut_min = td->lut_bottom; td->lut_max = td->lut_size - 1; @@ -773,9 +778,14 @@ static void dfll_init_out_if(struct tegra_dfll *td) dfll_force_output(td, vsel); } } else { - dfll_load_i2c_lut(td); + ret = dfll_load_i2c_lut(td); + if (ret < 0) + return ret; + dfll_init_i2c_if(td); } + + return 0; } /* @@ -1497,12 +1507,17 @@ static int dfll_init(struct tegra_dfll *td) dfll_set_open_loop_config(td); - dfll_init_out_if(td); + ret = dfll_init_out_if(td); pm_runtime_put_sync(td->dev); + if (ret < 0) + goto disable_rpm; + return 0; +disable_rpm: + pm_runtime_disable(td->dev); di_err2: clk_unprepare(td->soc_clk); di_err1: @@ -1547,6 +1562,7 @@ EXPORT_SYMBOL(tegra_dfll_suspend); int tegra_dfll_resume(struct device *dev) { struct tegra_dfll *td = dev_get_drvdata(dev); + int ret; reset_control_deassert(td->dvco_rst); @@ -1560,11 +1576,11 @@ int tegra_dfll_resume(struct device *dev) dfll_set_open_loop_config(td); - dfll_init_out_if(td); + ret = dfll_init_out_if(td); pm_runtime_put_sync(td->dev); - return 0; + return ret; } EXPORT_SYMBOL(tegra_dfll_resume);