From patchwork Thu Aug 4 14:38:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 12936448 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B59EC25B07 for ; Thu, 4 Aug 2022 14:39:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240084AbiHDOjx (ORCPT ); Thu, 4 Aug 2022 10:39:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239924AbiHDOjh (ORCPT ); Thu, 4 Aug 2022 10:39:37 -0400 Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7ECD501A9 for ; Thu, 4 Aug 2022 07:39:31 -0700 (PDT) Received: by mail-pf1-x429.google.com with SMTP id z187so9623218pfb.12 for ; Thu, 04 Aug 2022 07:39:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=eqpuB/jZzr6RZg9MRH4VQT6RcEmZ2WxwGiLdN4NtIg4=; b=evryTDQOO0HgjyAOUk7ubNrfNSGdkhoTL9o+GwIA/OY2hY+51Vj6trYOWxPbPml4FT rw9PKgSLcUoxCoT9TO13RHS09VL6LyK+mQWk3vhspjXMvgg7lc90ilqNvrtMSLhZl4Nj X1qeLbUpaXlwz6DeNwYCPuZGQ5yXzp18XZzuo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=eqpuB/jZzr6RZg9MRH4VQT6RcEmZ2WxwGiLdN4NtIg4=; b=CJRRcT7L6/bRiJAKRDX78G0Nk7IspOP6EpSL/LsiiM3tiAT8KEoi+rrsUZvdVXq4vW F+0JNpy3z0rEyB7cqQ3SAWOM89U3+eXqHpfbAYyHm29bfgwCh/h/EJ2MlQkhg/d4gUEh hWmfPpBIJsk3jyLgBCfJQrESPkjXPfJCvAtKOI1MEXf9bxeIENYolEK3E6SFi6k5IBfR sLMKagKk89RqC+0dGD15Mqtn3ulxJKI6PgXrhEjPnyiarzZJrQcJph0DujQ721lrnXyL vcCCjujQJT7vTK7NQJNOEKkzIzKC3MgwCAvkAujDF7vW04anXB/azNClHVjuegjsvBmU bCtg== X-Gm-Message-State: ACgBeo0/uKdFxeE54BSEMgaGoLCpTx/H9e+ZW0QuyjD2H11RM7qXkD9a xKvvGHhLxAv+Q9ecQd7o8tKP0Q== X-Google-Smtp-Source: AA6agR7Vaijl6KTd0e85hYD7XDfBZESwSM8wGKiYzx4xW6HUQmtTu+dDVpncWOtNc9BzWoeu3QXNSg== X-Received: by 2002:a63:87:0:b0:419:f2d0:1e3b with SMTP id 129-20020a630087000000b00419f2d01e3bmr1963782pga.234.1659623970813; Thu, 04 Aug 2022 07:39:30 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:201:aa71:2553:6f54:5cb1]) by smtp.gmail.com with ESMTPSA id h7-20020a170902680700b0016a111c83cdsm1075071plk.119.2022.08.04.07.39.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Aug 2022 07:39:30 -0700 (PDT) From: Douglas Anderson To: Rob Clark , Abhinav Kumar , Dmitry Baryshkov Cc: Mark Brown , linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Douglas Anderson , Daniel Vetter , David Airlie , Jonathan Marek , Rajeev Nandan , Sean Paul , Stephen Boyd , Vladimir Lypak , linux-kernel@vger.kernel.org Subject: [PATCH v4 6/6] drm/msm/dsi: Improve dsi_phy_driver_probe() probe error handling Date: Thu, 4 Aug 2022 07:38:53 -0700 Message-Id: <20220804073608.v4.6.I969118a35934a0e5007fe4f80e3e28e9c0b7602a@changeid> X-Mailer: git-send-email 2.37.1.455.g008518b4e5-goog In-Reply-To: <20220804143854.1544395-1-dianders@chromium.org> References: <20220804143854.1544395-1-dianders@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The dsi_phy_driver_probe() function has a "goto fail" for no reason. Change it to just always return directly when it sees an error. Make this simpler by leveraging dev_err_probe() which is designed to make code like this shorter / simpler. NOTE: as part of this, we now pass through error codes directly from msm_ioremap_size() rather than translating to -ENOMEM. This changed mostly because it's much more convenient when using dev_err_probe() and also it's usually encouraged not to hide error codes like the old code was doing unless there is a good reason. I can't see any reason why we'd need to return -ENOMEM instead of -EINVAL from the probe function. Signed-off-by: Douglas Anderson Reviewed-by: Dmitry Baryshkov Reviewed-by: Abhinav Kumar --- Changes in v4: - Mention error code change in commit message. Changes in v3: - ("Improve dsi_phy_driver_probe() probe error handling") new for v3. drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 74 ++++++++++----------------- 1 file changed, 27 insertions(+), 47 deletions(-) diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c index 0a00f9b73fc5..57cd525de7a1 100644 --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c @@ -621,12 +621,9 @@ static int dsi_phy_driver_probe(struct platform_device *pdev) phy->pdev = pdev; phy->id = dsi_phy_get_id(phy); - if (phy->id < 0) { - ret = phy->id; - DRM_DEV_ERROR(dev, "%s: couldn't identify PHY index, %d\n", - __func__, ret); - goto fail; - } + if (phy->id < 0) + return dev_err_probe(dev, phy->id, + "Couldn't identify PHY index\n"); phy->regulator_ldo_mode = of_property_read_bool(dev->of_node, "qcom,dsi-phy-regulator-ldo-mode"); @@ -634,88 +631,71 @@ static int dsi_phy_driver_probe(struct platform_device *pdev) phy->cphy_mode = (phy_type == PHY_TYPE_CPHY); phy->base = msm_ioremap_size(pdev, "dsi_phy", &phy->base_size); - if (IS_ERR(phy->base)) { - DRM_DEV_ERROR(dev, "%s: failed to map phy base\n", __func__); - ret = -ENOMEM; - goto fail; - } + if (IS_ERR(phy->base)) + return dev_err_probe(dev, PTR_ERR(phy->base), + "Failed to map phy base\n"); phy->pll_base = msm_ioremap_size(pdev, "dsi_pll", &phy->pll_size); - if (IS_ERR(phy->pll_base)) { - DRM_DEV_ERROR(&pdev->dev, "%s: failed to map pll base\n", __func__); - ret = -ENOMEM; - goto fail; - } + if (IS_ERR(phy->pll_base)) + return dev_err_probe(dev, PTR_ERR(phy->pll_base), + "Failed to map pll base\n"); if (phy->cfg->has_phy_lane) { phy->lane_base = msm_ioremap_size(pdev, "dsi_phy_lane", &phy->lane_size); - if (IS_ERR(phy->lane_base)) { - DRM_DEV_ERROR(&pdev->dev, "%s: failed to map phy lane base\n", __func__); - ret = -ENOMEM; - goto fail; - } + if (IS_ERR(phy->lane_base)) + return dev_err_probe(dev, PTR_ERR(phy->lane_base), + "Failed to map phy lane base\n"); } if (phy->cfg->has_phy_regulator) { phy->reg_base = msm_ioremap_size(pdev, "dsi_phy_regulator", &phy->reg_size); - if (IS_ERR(phy->reg_base)) { - DRM_DEV_ERROR(&pdev->dev, "%s: failed to map phy regulator base\n", __func__); - ret = -ENOMEM; - goto fail; - } + if (IS_ERR(phy->reg_base)) + return dev_err_probe(dev, PTR_ERR(phy->reg_base), + "Failed to map phy regulator base\n"); } if (phy->cfg->ops.parse_dt_properties) { ret = phy->cfg->ops.parse_dt_properties(phy); if (ret) - goto fail; + return ret; } ret = devm_regulator_bulk_get_const(dev, phy->cfg->num_regulators, phy->cfg->regulator_data, &phy->supplies); if (ret) - goto fail; + return ret; phy->ahb_clk = msm_clk_get(pdev, "iface"); - if (IS_ERR(phy->ahb_clk)) { - DRM_DEV_ERROR(dev, "%s: Unable to get ahb clk\n", __func__); - ret = PTR_ERR(phy->ahb_clk); - goto fail; - } + if (IS_ERR(phy->ahb_clk)) + return dev_err_probe(dev, PTR_ERR(phy->ahb_clk), + "Unable to get ahb clk\n"); /* PLL init will call into clk_register which requires * register access, so we need to enable power and ahb clock. */ ret = dsi_phy_enable_resource(phy); if (ret) - goto fail; + return ret; if (phy->cfg->ops.pll_init) { ret = phy->cfg->ops.pll_init(phy); - if (ret) { - DRM_DEV_INFO(dev, - "%s: pll init failed: %d, need separate pll clk driver\n", - __func__, ret); - goto fail; - } + if (ret) + return dev_err_probe(dev, ret, + "PLL init failed; need separate clk driver\n"); } ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, phy->provided_clocks); - if (ret) { - DRM_DEV_ERROR(dev, "%s: failed to register clk provider: %d\n", __func__, ret); - goto fail; - } + if (ret) + return dev_err_probe(dev, ret, + "Failed to register clk provider\n"); dsi_phy_disable_resource(phy); platform_set_drvdata(pdev, phy); return 0; - -fail: - return ret; } static struct platform_driver dsi_phy_platform_driver = {