From patchwork Fri Aug 24 10:27:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kiran Gunda X-Patchwork-Id: 10575131 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3687E921 for ; Fri, 24 Aug 2018 10:28:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 25DAE2C412 for ; Fri, 24 Aug 2018 10:28:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1A0E82C41D; Fri, 24 Aug 2018 10:28:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5BFEA2C412 for ; Fri, 24 Aug 2018 10:28:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727623AbeHXOCv (ORCPT ); Fri, 24 Aug 2018 10:02:51 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:49738 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726941AbeHXOCu (ORCPT ); Fri, 24 Aug 2018 10:02:50 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id E6E1D60710; Fri, 24 Aug 2018 10:28:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1535106529; bh=gVlaudLZyycc2qumeC2FrjYgWzwF8omVRpLethv/VzU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lNplrFvJtMDTiLDtjaGNsKMnuAaQbt70gmayP0fKT80G7pkhNueYDexia5INSVCQm UA93pFRW6Tt6/+MuH5O/mxv8KDo/9Z3gRXcrRAnWzC1C1hZYqC39CRQs39iZ1BiX8K 2JzoCfbNdTpI/vaSH5DsnpgXBpKsQ0OOfx4615hI= Received: from kgunda-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: kgunda@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 133F2607F7; Fri, 24 Aug 2018 10:28:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1535106525; bh=gVlaudLZyycc2qumeC2FrjYgWzwF8omVRpLethv/VzU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Eotyurwm5S+Yj66Wc/cVK5WVcIPVuEibWZGzrCvW7LjMl1TmDUcbm+di4i8qRhmrN kYgEZDP/XMmyMGHRrY33f3wdTrQl8c+TVRjQb5hGExzRFeT9c38QOKNTz8yXW52o4h yiWDU9Gvrkz3ib842emN7xM6b5gwEwjRgwAwvz74= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 133F2607F7 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=kgunda@codeaurora.org From: Kiran Gunda To: bjorn.andersson@linaro.org, jingoohan1@gmail.com, lee.jones@linaro.org, b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, daniel.thompson@linaro.org, jacek.anaszewski@gmail.com, pavel@ucw.cz, robh+dt@kernel.org, mark.rutland@arm.com, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, Kiran Gunda Subject: [PATCH V5 7/8] backlight: qcom-wled: add support for short circuit handling Date: Fri, 24 Aug 2018 15:57:46 +0530 Message-Id: <1535106467-17843-8-git-send-email-kgunda@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1535106467-17843-1-git-send-email-kgunda@codeaurora.org> References: <1535106467-17843-1-git-send-email-kgunda@codeaurora.org> Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Handle the short circuit interrupt and check if the short circuit interrupt is valid. Re-enable the module to check if it goes away. Disable the module altogether if the short circuit event persists. Signed-off-by: Kiran Gunda Reviewed-by: Bjorn Andersson --- Changes from V3: - Added Reviewed by tag. - Addressed minor comments from Vinod Changes from V4: - Changed the return value from -EINVAL to -ENXIO - Re-initializing the short_count from 0 to 1. drivers/video/backlight/qcom-wled.c | 132 ++++++++++++++++++++++++++++++++++-- 1 file changed, 128 insertions(+), 4 deletions(-) diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index 49fdd23..d891067 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -10,6 +10,9 @@ * GNU General Public License for more details. */ +#include +#include +#include #include #include #include @@ -64,6 +67,16 @@ #define WLED3_SINK_REG_STR_CABC(n) (0x66 + (n * 0x10)) #define WLED3_SINK_REG_STR_CABC_MASK BIT(7) +/* WLED4 specific control registers */ +#define WLED4_CTRL_REG_SHORT_PROTECT 0x5e +#define WLED4_CTRL_REG_SHORT_EN_MASK BIT(7) + +#define WLED4_CTRL_REG_SEC_ACCESS 0xd0 +#define WLED4_CTRL_REG_SEC_UNLOCK 0xa5 + +#define WLED4_CTRL_REG_TEST1 0xe2 +#define WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2 0x09 + /* WLED4 specific sink registers */ #define WLED4_SINK_REG_CURR_SINK 0x46 #define WLED4_SINK_REG_CURR_SINK_MASK GENMASK(7, 4) @@ -113,17 +126,23 @@ struct wled_config { bool cs_out_en; bool ext_gen; bool cabc; + bool external_pfet; }; struct wled { const char *name; struct device *dev; struct regmap *regmap; + struct mutex lock; /* Lock to avoid race from thread irq handler */ + ktime_t last_short_event; u16 ctrl_addr; u16 sink_addr; u16 max_string_count; u32 brightness; u32 max_brightness; + u32 short_count; + bool disabled_by_short; + bool has_short_detect; struct wled_config cfg; int (*wled_set_brightness)(struct wled *wled, u16 brightness); @@ -174,6 +193,9 @@ static int wled_module_enable(struct wled *wled, int val) { int rc; + if (wled->disabled_by_short) + return -ENXIO; + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + WLED_CTRL_REG_MOD_EN, WLED_CTRL_REG_MOD_EN_MASK, @@ -210,18 +232,19 @@ static int wled_update_status(struct backlight_device *bl) bl->props.state & BL_CORE_FBBLANK) brightness = 0; + mutex_lock(&wled->lock); if (brightness) { rc = wled->wled_set_brightness(wled, brightness); if (rc < 0) { dev_err(wled->dev, "wled failed to set brightness rc:%d\n", rc); - return rc; + goto unlock_mutex; } rc = wled_sync_toggle(wled); if (rc < 0) { dev_err(wled->dev, "wled sync failed rc:%d\n", rc); - return rc; + goto unlock_mutex; } } @@ -229,15 +252,61 @@ static int wled_update_status(struct backlight_device *bl) rc = wled_module_enable(wled, !!brightness); if (rc < 0) { dev_err(wled->dev, "wled enable failed rc:%d\n", rc); - return rc; + goto unlock_mutex; } } wled->brightness = brightness; +unlock_mutex: + mutex_unlock(&wled->lock); + return rc; } +#define WLED_SHORT_DLY_MS 20 +#define WLED_SHORT_CNT_MAX 5 +#define WLED_SHORT_RESET_CNT_DLY_US USEC_PER_SEC + +static irqreturn_t wled_short_irq_handler(int irq, void *_wled) +{ + struct wled *wled = _wled; + int rc; + s64 elapsed_time; + + wled->short_count++; + mutex_lock(&wled->lock); + rc = wled_module_enable(wled, false); + if (rc < 0) { + dev_err(wled->dev, "wled disable failed rc:%d\n", rc); + goto unlock_mutex; + } + + elapsed_time = ktime_us_delta(ktime_get(), + wled->last_short_event); + if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US) + wled->short_count = 1; + + if (wled->short_count > WLED_SHORT_CNT_MAX) { + dev_err(wled->dev, "Short trigged %d times, disabling WLED forever!\n", + wled->short_count); + wled->disabled_by_short = true; + goto unlock_mutex; + } + + wled->last_short_event = ktime_get(); + + msleep(WLED_SHORT_DLY_MS); + rc = wled_module_enable(wled, true); + if (rc < 0) + dev_err(wled->dev, "wled enable failed rc:%d\n", rc); + +unlock_mutex: + mutex_unlock(&wled->lock); + + return IRQ_HANDLED; +} + static int wled3_setup(struct wled *wled) { u16 addr; @@ -326,7 +395,7 @@ static int wled4_setup(struct wled *wled) int rc, temp, i, j; u16 addr; u8 sink_en = 0; - u32 sink_cfg = 0; + u32 sink_cfg; rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + WLED_CTRL_REG_OVP, @@ -348,6 +417,21 @@ static int wled4_setup(struct wled *wled) if (rc < 0) return rc; + if (wled->cfg.external_pfet) { + /* Unlock the secure register access */ + rc = regmap_write(wled->regmap, wled->ctrl_addr + + WLED4_CTRL_REG_SEC_ACCESS, + WLED4_CTRL_REG_SEC_UNLOCK); + if (rc < 0) + return rc; + + rc = regmap_write(wled->regmap, + wled->ctrl_addr + WLED4_CTRL_REG_TEST1, + WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2); + if (rc < 0) + return rc; + } + rc = regmap_read(wled->regmap, wled->sink_addr + WLED4_SINK_REG_CURR_SINK, &sink_cfg); if (rc < 0) @@ -433,6 +517,7 @@ static int wled4_setup(struct wled *wled) .num_strings = 4, .switch_freq = 11, .cabc = false, + .external_pfet = false, }; static const u32 wled3_boost_i_limit_values[] = { @@ -598,6 +683,7 @@ static int wled_configure(struct wled *wled, int version) { "qcom,cs-out", &cfg->cs_out_en, }, { "qcom,ext-gen", &cfg->ext_gen, }, { "qcom,cabc", &cfg->cabc, }, + { "qcom,external-pfet", &cfg->external_pfet, }, }; prop_addr = of_get_address(dev->of_node, 0, NULL, NULL); @@ -686,6 +772,38 @@ static int wled_configure(struct wled *wled, int version) return 0; } +static int wled_configure_short_irq(struct wled *wled, + struct platform_device *pdev) +{ + int rc, short_irq; + + if (!wled->has_short_detect) + return 0; + + rc = regmap_update_bits(wled->regmap, wled->ctrl_addr + + WLED4_CTRL_REG_SHORT_PROTECT, + WLED4_CTRL_REG_SHORT_EN_MASK, + WLED4_CTRL_REG_SHORT_EN_MASK); + if (rc < 0) + return rc; + + short_irq = platform_get_irq_byname(pdev, "short"); + if (short_irq < 0) { + dev_dbg(&pdev->dev, "short irq is not used\n"); + return 0; + } + + rc = devm_request_threaded_irq(wled->dev, short_irq, + NULL, wled_short_irq_handler, + IRQF_ONESHOT, + "wled_short_irq", wled); + if (rc < 0) + dev_err(wled->dev, "Unable to request short_irq (err:%d)\n", + rc); + + return rc; +} + static const struct backlight_ops wled_ops = { .update_status = wled_update_status, }; @@ -719,6 +837,7 @@ static int wled_probe(struct platform_device *pdev) return -ENODEV; } + mutex_init(&wled->lock); rc = wled_configure(wled, version); if (rc) return rc; @@ -733,6 +852,7 @@ static int wled_probe(struct platform_device *pdev) break; case 4: + wled->has_short_detect = true; rc = wled4_setup(wled); if (rc) { dev_err(&pdev->dev, "wled4_setup failed\n"); @@ -745,6 +865,10 @@ static int wled_probe(struct platform_device *pdev) break; } + rc = wled_configure_short_irq(wled, pdev); + if (rc < 0) + return rc; + val = WLED_DEFAULT_BRIGHTNESS; of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);