From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Thompson Subject: Re: [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling Date: Fri, 20 Jul 2018 15:07:17 +0100 Message-ID: <1a708fea-0759-fcd0-d169-a36e21c31c28@linaro.org> References: <1531131741-19971-1-git-send-email-kgunda@codeaurora.org> <1531131741-19971-8-git-send-email-kgunda@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8"; Format="flowed" Content-Transfer-Encoding: base64 Return-path: In-Reply-To: <1531131741-19971-8-git-send-email-kgunda@codeaurora.org> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Kiran Gunda , bjorn.andersson@linaro.org, jingoohan1@gmail.com, lee.jones@linaro.org, b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.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 List-Id: linux-leds@vger.kernel.org T24gMDkvMDcvMTggMTE6MjIsIEtpcmFuIEd1bmRhIHdyb3RlOgo+IEhhbmRsZSB0aGUgc2hvcnQg Y2lyY3VpdCBpbnRlcnJ1cHQgYW5kIGNoZWNrIGlmIHRoZSBzaG9ydCBjaXJjdWl0Cj4gaW50ZXJy dXB0IGlzIHZhbGlkLiBSZS1lbmFibGUgdGhlIG1vZHVsZSB0byBjaGVjayBpZiBpdCBnb2VzCj4g YXdheS4gRGlzYWJsZSB0aGUgbW9kdWxlIGFsdG9nZXRoZXIgaWYgdGhlIHNob3J0IGNpcmN1aXQg ZXZlbnQKPiBwZXJzaXN0cy4KPiAKPiBTaWduZWQtb2ZmLWJ5OiBLaXJhbiBHdW5kYSA8a2d1bmRh QGNvZGVhdXJvcmEub3JnPgo+IFJldmlld2VkLWJ5OiBCam9ybiBBbmRlcnNzb24gPGJqb3JuLmFu ZGVyc3NvbkBsaW5hcm8ub3JnPgo+IC0tLQo+IENoYW5nZXMgZnJvbSBWMzoKPiAJLSBBZGRlZCBS ZXZpZXdlZCBieSB0YWcuCj4gCS0gQWRkcmVzc2VkIG1pbm9yIGNvbW1lbnRzIGZyb20gVmlub2QK PiAKPiAgIGRyaXZlcnMvdmlkZW8vYmFja2xpZ2h0L3Fjb20td2xlZC5jIHwgMTMyICsrKysrKysr KysrKysrKysrKysrKysrKysrKysrKysrKystLQo+ICAgMSBmaWxlIGNoYW5nZWQsIDEyOCBpbnNl cnRpb25zKCspLCA0IGRlbGV0aW9ucygtKQo+IAo+IGRpZmYgLS1naXQgYS9kcml2ZXJzL3ZpZGVv L2JhY2tsaWdodC9xY29tLXdsZWQuYyBiL2RyaXZlcnMvdmlkZW8vYmFja2xpZ2h0L3Fjb20td2xl ZC5jCj4gaW5kZXggMzYyZDI1NC4uYTE0ZjFhNiAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL3ZpZGVv L2JhY2tsaWdodC9xY29tLXdsZWQuYwo+ICsrKyBiL2RyaXZlcnMvdmlkZW8vYmFja2xpZ2h0L3Fj b20td2xlZC5jCj4gQEAgLTEwLDYgKzEwLDkgQEAKPiAgICAqIEdOVSBHZW5lcmFsIFB1YmxpYyBM aWNlbnNlIGZvciBtb3JlIGRldGFpbHMuCj4gICAgKi8KPiAgIAo+ICsjaW5jbHVkZSA8bGludXgv ZGVsYXkuaD4KPiArI2luY2x1ZGUgPGxpbnV4L2ludGVycnVwdC5oPgo+ICsjaW5jbHVkZSA8bGlu dXgva3RpbWUuaD4KPiAgICNpbmNsdWRlIDxsaW51eC9rZXJuZWwuaD4KPiAgICNpbmNsdWRlIDxs aW51eC9iYWNrbGlnaHQuaD4KPiAgICNpbmNsdWRlIDxsaW51eC9tb2R1bGUuaD4KPiBAQCAtNjQs NiArNjcsMTYgQEAKPiAgICNkZWZpbmUgV0xFRDNfU0lOS19SRUdfU1RSX0NBQkMobikJCQkoMHg2 NiArIChuICogMHgxMCkpCj4gICAjZGVmaW5lICBXTEVEM19TSU5LX1JFR19TVFJfQ0FCQ19NQVNL CQkJQklUKDcpCj4gICAKPiArLyogV0xFRDQgc3BlY2lmaWMgY29udHJvbCByZWdpc3RlcnMgKi8K PiArI2RlZmluZSBXTEVENF9DVFJMX1JFR19TSE9SVF9QUk9URUNUCQkJMHg1ZQo+ICsjZGVmaW5l ICBXTEVENF9DVFJMX1JFR19TSE9SVF9FTl9NQVNLCQkJQklUKDcpCj4gKwo+ICsjZGVmaW5lIFdM RUQ0X0NUUkxfUkVHX1NFQ19BQ0NFU1MJCQkweGQwCj4gKyNkZWZpbmUgIFdMRUQ0X0NUUkxfUkVH X1NFQ19VTkxPQ0sJCQkweGE1Cj4gKwo+ICsjZGVmaW5lIFdMRUQ0X0NUUkxfUkVHX1RFU1QxCQkJ CTB4ZTIKPiArI2RlZmluZSAgV0xFRDRfQ1RSTF9SRUdfVEVTVDFfRVhUX0ZFVF9EVEVTVDIJCTB4 MDkKPiArCj4gICAvKiBXTEVENCBzcGVjaWZpYyBzaW5rIHJlZ2lzdGVycyAqLwo+ICAgI2RlZmlu ZSBXTEVENF9TSU5LX1JFR19DVVJSX1NJTksJCQkweDQ2Cj4gICAjZGVmaW5lICBXTEVENF9TSU5L X1JFR19DVVJSX1NJTktfTUFTSwkJCUdFTk1BU0soNywgNCkKPiBAQCAtMTEzLDE3ICsxMjYsMjMg QEAgc3RydWN0IHdsZWRfY29uZmlnIHsKPiAgIAlib29sIGNzX291dF9lbjsKPiAgIAlib29sIGV4 dF9nZW47Cj4gICAJYm9vbCBjYWJjOwo+ICsJYm9vbCBleHRlcm5hbF9wZmV0Owo+ICAgfTsKPiAg IAo+ICAgc3RydWN0IHdsZWQgewo+ICAgCWNvbnN0IGNoYXIgKm5hbWU7Cj4gICAJc3RydWN0IGRl dmljZSAqZGV2Owo+ICAgCXN0cnVjdCByZWdtYXAgKnJlZ21hcDsKPiArCXN0cnVjdCBtdXRleCBs b2NrOwkvKiBMb2NrIHRvIGF2b2lkIHJhY2UgZnJvbSB0aHJlYWQgaXJxIGhhbmRsZXIgKi8KPiAr CWt0aW1lX3QgbGFzdF9zaG9ydF9ldmVudDsKPiAgIAl1MTYgY3RybF9hZGRyOwo+ICAgCXUxNiBz aW5rX2FkZHI7Cj4gICAJdTE2IG1heF9zdHJpbmdfY291bnQ7Cj4gICAJdTMyIGJyaWdodG5lc3M7 Cj4gICAJdTMyIG1heF9icmlnaHRuZXNzOwo+ICsJdTMyIHNob3J0X2NvdW50Owo+ICsJYm9vbCBk aXNhYmxlZF9ieV9zaG9ydDsKPiArCWJvb2wgaGFzX3Nob3J0X2RldGVjdDsKPiAgIAo+ICAgCXN0 cnVjdCB3bGVkX2NvbmZpZyBjZmc7Cj4gICAJaW50ICgqd2xlZF9zZXRfYnJpZ2h0bmVzcykoc3Ry dWN0IHdsZWQgKndsZWQsIHUxNiBicmlnaHRuZXNzKTsKPiBAQCAtMTc0LDYgKzE5Myw5IEBAIHN0 YXRpYyBpbnQgd2xlZF9tb2R1bGVfZW5hYmxlKHN0cnVjdCB3bGVkICp3bGVkLCBpbnQgdmFsKQo+ ICAgewo+ICAgCWludCByYzsKPiAgIAo+ICsJaWYgKHdsZWQtPmRpc2FibGVkX2J5X3Nob3J0KQo+ ICsJCXJldHVybiAtRUZBVUxUOwoKRUZBVUxUIG1lYW5zIGJhZCBhZGRyZXNzIChtZW1vcnkgZmF1 bHQpLiBQZXJoYXBzIEVJTyBvciBtYXliZSBldmVuIApzb21ldGhpbmcgbW9yZSBleG90aWMgbGlr ZSBFTlhJTyBtaWdodCBiZSBtb3JlIGFwcHJvcHJpYXRlPwoKCj4gKwo+ICAgCXJjID0gcmVnbWFw X3VwZGF0ZV9iaXRzKHdsZWQtPnJlZ21hcCwgd2xlZC0+Y3RybF9hZGRyICsKPiAgIAkJCQlXTEVE X0NUUkxfUkVHX01PRF9FTiwKPiAgIAkJCQlXTEVEX0NUUkxfUkVHX01PRF9FTl9NQVNLLAo+IEBA IC0yMTAsMTggKzIzMiwxOSBAQCBzdGF0aWMgaW50IHdsZWRfdXBkYXRlX3N0YXR1cyhzdHJ1Y3Qg YmFja2xpZ2h0X2RldmljZSAqYmwpCj4gICAJICAgIGJsLT5wcm9wcy5zdGF0ZSAmIEJMX0NPUkVf RkJCTEFOSykKPiAgIAkJYnJpZ2h0bmVzcyA9IDA7Cj4gICAKPiArCW11dGV4X2xvY2soJndsZWQt PmxvY2spOwo+ICAgCWlmIChicmlnaHRuZXNzKSB7Cj4gICAJCXJjID0gd2xlZC0+d2xlZF9zZXRf YnJpZ2h0bmVzcyh3bGVkLCBicmlnaHRuZXNzKTsKPiAgIAkJaWYgKHJjIDwgMCkgewo+ICAgCQkJ ZGV2X2Vycih3bGVkLT5kZXYsICJ3bGVkIGZhaWxlZCB0byBzZXQgYnJpZ2h0bmVzcyByYzolZFxu IiwKPiAgIAkJCQlyYyk7Cj4gLQkJCXJldHVybiByYzsKPiArCQkJZ290byB1bmxvY2tfbXV0ZXg7 Cj4gICAJCX0KPiAgIAo+ICAgCQlyYyA9IHdsZWRfc3luY190b2dnbGUod2xlZCk7Cj4gICAJCWlm IChyYyA8IDApIHsKPiAgIAkJCWRldl9lcnIod2xlZC0+ZGV2LCAid2xlZCBzeW5jIGZhaWxlZCBy YzolZFxuIiwgcmMpOwo+IC0JCQlyZXR1cm4gcmM7Cj4gKwkJCWdvdG8gdW5sb2NrX211dGV4Owo+ ICAgCQl9Cj4gICAJfQo+ICAgCj4gQEAgLTIyOSwxNSArMjUyLDYxIEBAIHN0YXRpYyBpbnQgd2xl ZF91cGRhdGVfc3RhdHVzKHN0cnVjdCBiYWNrbGlnaHRfZGV2aWNlICpibCkKPiAgIAkJcmMgPSB3 bGVkX21vZHVsZV9lbmFibGUod2xlZCwgISFicmlnaHRuZXNzKTsKPiAgIAkJaWYgKHJjIDwgMCkg ewo+ICAgCQkJZGV2X2Vycih3bGVkLT5kZXYsICJ3bGVkIGVuYWJsZSBmYWlsZWQgcmM6JWRcbiIs IHJjKTsKPiAtCQkJcmV0dXJuIHJjOwo+ICsJCQlnb3RvIHVubG9ja19tdXRleDsKPiAgIAkJfQo+ ICAgCX0KPiAgIAo+ICAgCXdsZWQtPmJyaWdodG5lc3MgPSBicmlnaHRuZXNzOwo+ICAgCj4gK3Vu bG9ja19tdXRleDoKPiArCW11dGV4X3VubG9jaygmd2xlZC0+bG9jayk7Cj4gKwo+ICAgCXJldHVy biByYzsKPiAgIH0KPiAgIAo+ICsjZGVmaW5lIFdMRURfU0hPUlRfRExZX01TCQkJMjAKPiArI2Rl ZmluZSBXTEVEX1NIT1JUX0NOVF9NQVgJCQk1Cj4gKyNkZWZpbmUgV0xFRF9TSE9SVF9SRVNFVF9D TlRfRExZX1VTCQlVU0VDX1BFUl9TRUMKPiArCj4gK3N0YXRpYyBpcnFyZXR1cm5fdCB3bGVkX3No b3J0X2lycV9oYW5kbGVyKGludCBpcnEsIHZvaWQgKl93bGVkKQo+ICt7Cj4gKwlzdHJ1Y3Qgd2xl ZCAqd2xlZCA9IF93bGVkOwo+ICsJaW50IHJjOwo+ICsJczY0IGVsYXBzZWRfdGltZTsKPiArCj4g Kwl3bGVkLT5zaG9ydF9jb3VudCsrOwo+ICsJbXV0ZXhfbG9jaygmd2xlZC0+bG9jayk7Cj4gKwly YyA9IHdsZWRfbW9kdWxlX2VuYWJsZSh3bGVkLCBmYWxzZSk7Cj4gKwlpZiAocmMgPCAwKSB7Cj4g KwkJZGV2X2Vycih3bGVkLT5kZXYsICJ3bGVkIGRpc2FibGUgZmFpbGVkIHJjOiVkXG4iLCByYyk7 Cj4gKwkJZ290byB1bmxvY2tfbXV0ZXg7Cj4gKwl9Cj4gKwo+ICsJZWxhcHNlZF90aW1lID0ga3Rp bWVfdXNfZGVsdGEoa3RpbWVfZ2V0KCksCj4gKwkJCQkgICAgICB3bGVkLT5sYXN0X3Nob3J0X2V2 ZW50KTsKPiArCWlmIChlbGFwc2VkX3RpbWUgPiBXTEVEX1NIT1JUX1JFU0VUX0NOVF9ETFlfVVMp Cj4gKwkJd2xlZC0+c2hvcnRfY291bnQgPSAwOwoKU2hvdWxkbid0IHRoaXMgcmVzZXQgdG8gMSAo ZS5nLiB3ZSBoYXZlIGp1c3Qgc2VlbiBhIHNob3J0KS4KCgpEYW5pZWwuCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmRyaS1kZXZlbCBtYWlsaW5nIGxpc3QK ZHJpLWRldmVsQGxpc3RzLmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNrdG9w Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL2RyaS1kZXZlbAo= From mboxrd@z Thu Jan 1 00:00:00 1970 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=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED autolearn=ham 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 56424ECDFB8 for ; Fri, 20 Jul 2018 14:07:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EA82C206B7 for ; Fri, 20 Jul 2018 14:07:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linaro.org header.i=@linaro.org header.b="jQdy7/ki" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EA82C206B7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731678AbeGTOzt (ORCPT ); Fri, 20 Jul 2018 10:55:49 -0400 Received: from mail-wr1-f68.google.com ([209.85.221.68]:35965 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731000AbeGTOzt (ORCPT ); Fri, 20 Jul 2018 10:55:49 -0400 Received: by mail-wr1-f68.google.com with SMTP id h9-v6so11483992wro.3 for ; Fri, 20 Jul 2018 07:07:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=3aBH3Auw0nDb/jP2lXlkT5e9tLD44GenlLCmj5VqHQw=; b=jQdy7/kiGqbnV93zCW3Yf+Y8GbMt5ozKJWV7Kjx0qG5gMzOrxBhsOTU4M0ryG01JoV Cavr14LGnusNqsZonp8s9PnFvHzTupAmKVBmL21pRAhlgI74juO6J05dj9yHGoJc35B9 1qiQGvhAo62ssMle1vDiKxvFv7bs0Hw7OyDBU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=3aBH3Auw0nDb/jP2lXlkT5e9tLD44GenlLCmj5VqHQw=; b=rutnBISG6Fwk5Dkjk9tBAbJ9x9FskhryHC/Vs31hagxfdjWwIOov65VhVFjnUmLiZH MZE2aV55g92u3yNpZ7mCBuMEl73GqCJcE2uAK7jjir0T1TKXJtBW3qBMhAPF1jVEPkJb xoIOCMnOe5R2zhVblelqOGJzbhCSh2BibPUTS958WmUfvRc1tBf5J/SPxgLD+jr70CgT LI3TgTgXmekcLQjElegPh1DUDofo6Dgf/EagAg4qgNh0xPgE3YSyR4wTBanIqqaCYkdk 2vdtkiPRLfs03a1JxC6REVUXQzQu8rZtFnFOYjyx4/Ef8zX8sI4fBUW6nulHHV2YTmwH tSYA== X-Gm-Message-State: AOUpUlE0OehqOqPRvNXyL5T/9lT/CSFCmcbPSJsL/szon3P3sdYcIc6H cmiLqcetBjtRe77SSCDrsnaPNw== X-Google-Smtp-Source: AAOMgpc/YK4bb/PvFhjN5mTVO6kJSc6+XdJCuzJeG4rGgGjBm7NmZL1+U9Ugc6BFfCRycWJxoxqA5w== X-Received: by 2002:a5d:4643:: with SMTP id j3-v6mr1592938wrs.52.1532095639973; Fri, 20 Jul 2018 07:07:19 -0700 (PDT) Received: from holly.lan (cpc141214-aztw34-2-0-cust773.18-1.cable.virginm.net. [86.9.19.6]) by smtp.googlemail.com with ESMTPSA id o8-v6sm2050255wro.68.2018.07.20.07.07.18 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Jul 2018 07:07:18 -0700 (PDT) Subject: Re: [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling To: Kiran Gunda , bjorn.andersson@linaro.org, jingoohan1@gmail.com, lee.jones@linaro.org, b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.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 References: <1531131741-19971-1-git-send-email-kgunda@codeaurora.org> <1531131741-19971-8-git-send-email-kgunda@codeaurora.org> From: Daniel Thompson Message-ID: <1a708fea-0759-fcd0-d169-a36e21c31c28@linaro.org> Date: Fri, 20 Jul 2018 15:07:17 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1531131741-19971-8-git-send-email-kgunda@codeaurora.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/07/18 11:22, Kiran Gunda wrote: > 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 > > 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 362d254..a14f1a6 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 -EFAULT; EFAULT means bad address (memory fault). Perhaps EIO or maybe even something more exotic like ENXIO might be more appropriate? > + > 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 = 0; Shouldn't this reset to 1 (e.g. we have just seen a short). Daniel. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Thompson Date: Fri, 20 Jul 2018 14:07:17 +0000 Subject: Re: [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling Message-Id: <1a708fea-0759-fcd0-d169-a36e21c31c28@linaro.org> List-Id: References: <1531131741-19971-1-git-send-email-kgunda@codeaurora.org> <1531131741-19971-8-git-send-email-kgunda@codeaurora.org> In-Reply-To: <1531131741-19971-8-git-send-email-kgunda@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Kiran Gunda , bjorn.andersson@linaro.org, jingoohan1@gmail.com, lee.jones@linaro.org, b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.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 On 09/07/18 11:22, Kiran Gunda wrote: > 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 > > 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 362d254..a14f1a6 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 -EFAULT; EFAULT means bad address (memory fault). Perhaps EIO or maybe even something more exotic like ENXIO might be more appropriate? > + > 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 = 0; Shouldn't this reset to 1 (e.g. we have just seen a short). Daniel.