From patchwork Wed Oct 16 22:18:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 11194539 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3D82D139A for ; Wed, 16 Oct 2019 22:19:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2786821A4C for ; Wed, 16 Oct 2019 22:19:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388825AbfJPWT4 (ORCPT ); Wed, 16 Oct 2019 18:19:56 -0400 Received: from muru.com ([72.249.23.125]:37624 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725856AbfJPWTy (ORCPT ); Wed, 16 Oct 2019 18:19:54 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 7DD2D8107; Wed, 16 Oct 2019 22:20:19 +0000 (UTC) From: Tony Lindgren To: Sebastian Reichel Cc: linux-pm@vger.kernel.org, linux-omap@vger.kernel.org, Pavel Machek , Rob Herring , Merlijn Wajer Subject: [PATCHv2] power: supply: cpcap-charger: Limit voltage to 4.2V for battery Date: Wed, 16 Oct 2019 15:18:17 -0700 Message-Id: <20191016221817.8501-1-tony@atomide.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org There have been some cases of droid4 battery bulging that seem to be related to being left connected to the charger for several weeks. It is suspected that the 4.35V charge voltage configured for the battery is too much in the long run, so lets limit the charge voltage to 4.2V. It could also be that the batteries are just getting old. We don't really want to just change the charge voltage to 4.2V as Android may have charged the battery to 4.35V as pointed out by Pavel Machek. To add checks for battery voltage, the driver needs to understand the voltage it's charging at, and also needs to better understand it's charger state. Right now it only understands connect and disconnect, while now we need to know also a connected state but not charging. So let's add better charger state handling with help of chrgcurr2 interrupt for detecting charge full and retry, and add a check for battery voltage before we start charging. And then we finally can lower the charge voltage to 4.2V. Note that we've been using the same register values as the Android distros on droid4, so it is suspected that the same problem also exists in Android. Cc: Pavel Machek Cc: Rob Herring Reported-by: Merlijn Wajer Signed-off-by: Tony Lindgren --- If this looks OK, I would appreciate an immutable branch against v5.4-rc1 with just this patch in it for merge conflicts with v5.5 dts changes. Changes since v1: - Fix up typos noted by Pavel for 3.51V while it sould be 4.35V - Updated against v5.4-rc series instead of v5.3 as we do not want to apply this for earlier kernels automatically except maybe later on --- .../bindings/power/supply/cpcap-charger.txt | 9 +- .../arm/boot/dts/motorola-cpcap-mapphone.dtsi | 6 +- drivers/power/supply/cpcap-charger.c | 132 +++++++++++++++++- 3 files changed, 140 insertions(+), 7 deletions(-) diff --git a/Documentation/devicetree/bindings/power/supply/cpcap-charger.txt b/Documentation/devicetree/bindings/power/supply/cpcap-charger.txt --- a/Documentation/devicetree/bindings/power/supply/cpcap-charger.txt +++ b/Documentation/devicetree/bindings/power/supply/cpcap-charger.txt @@ -5,7 +5,8 @@ Required properties: - interrupts: Interrupt specifier for each name in interrupt-names - interrupt-names: Should contain the following entries: "chrg_det", "rvrs_chrg", "chrg_se1b", "se0conn", - "rvrs_mode", "chrgcurr1", "vbusvld", "battdetb" + "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld", + "battdetb" - io-channels: IIO ADC channel specifier for each name in io-channel-names - io-channel-names: Should contain the following entries: "battdetb", "battp", "vbus", "chg_isense", "batti" @@ -21,11 +22,13 @@ cpcap_charger: charger { compatible = "motorola,mapphone-cpcap-charger"; interrupts-extended = < &cpcap 13 0 &cpcap 12 0 &cpcap 29 0 &cpcap 28 0 - &cpcap 22 0 &cpcap 20 0 &cpcap 19 0 &cpcap 54 0 + &cpcap 22 0 &cpcap 21 0 &cpcap 20 0 &cpcap 19 0 + &cpcap 54 0 >; interrupt-names = "chrg_det", "rvrs_chrg", "chrg_se1b", "se0conn", - "rvrs_mode", "chrgcurr1", "vbusvld", "battdetb"; + "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld", + "battdetb"; mode-gpios = <&gpio3 29 GPIO_ACTIVE_LOW &gpio3 23 GPIO_ACTIVE_LOW>; io-channels = <&cpcap_adc 0 &cpcap_adc 1 diff --git a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi --- a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi +++ b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi @@ -43,11 +43,13 @@ compatible = "motorola,mapphone-cpcap-charger"; interrupts-extended = < &cpcap 13 0 &cpcap 12 0 &cpcap 29 0 &cpcap 28 0 - &cpcap 22 0 &cpcap 20 0 &cpcap 19 0 &cpcap 54 0 + &cpcap 22 0 &cpcap 21 0 &cpcap 20 0 &cpcap 19 0 + &cpcap 54 0 >; interrupt-names = "chrg_det", "rvrs_chrg", "chrg_se1b", "se0conn", - "rvrs_mode", "chrgcurr1", "vbusvld", "battdetb"; + "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld", + "battdetb"; mode-gpios = <&gpio3 29 GPIO_ACTIVE_LOW &gpio3 23 GPIO_ACTIVE_LOW>; io-channels = <&cpcap_adc 0 &cpcap_adc 1 diff --git a/drivers/power/supply/cpcap-charger.c b/drivers/power/supply/cpcap-charger.c --- a/drivers/power/supply/cpcap-charger.c +++ b/drivers/power/supply/cpcap-charger.c @@ -120,6 +120,13 @@ enum { CPCAP_CHARGER_IIO_NR, }; +enum { + CPCAP_CHARGER_DISCONNECTED, + CPCAP_CHARGER_DETECTING, + CPCAP_CHARGER_CHARGING, + CPCAP_CHARGER_DONE, +}; + struct cpcap_charger_ddata { struct device *dev; struct regmap *reg; @@ -138,6 +145,8 @@ struct cpcap_charger_ddata { atomic_t active; int status; + int state; + int voltage; }; struct cpcap_interrupt_desc { @@ -153,6 +162,7 @@ struct cpcap_charger_ints_state { bool chrg_se1b; bool rvrs_mode; + bool chrgcurr2; bool chrgcurr1; bool vbusvld; @@ -422,6 +432,7 @@ static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata, s->chrg_se1b = val & BIT(13); s->rvrs_mode = val & BIT(6); + s->chrgcurr2 = val & BIT(5); s->chrgcurr1 = val & BIT(4); s->vbusvld = val & BIT(3); @@ -434,6 +445,79 @@ static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata, return 0; } +static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata, + int state) +{ + const char *status; + + if (state > CPCAP_CHARGER_DONE) { + dev_warn(ddata->dev, "unknown state: %i\n", state); + + return; + } + + ddata->state = state; + + switch (state) { + case CPCAP_CHARGER_DISCONNECTED: + status = "DISCONNECTED"; + break; + case CPCAP_CHARGER_DETECTING: + status = "DETECTING"; + break; + case CPCAP_CHARGER_CHARGING: + status = "CHARGING"; + break; + case CPCAP_CHARGER_DONE: + status = "DONE"; + break; + default: + return; + } + + dev_dbg(ddata->dev, "state: %s\n", status); +} + +int cpcap_charger_voltage_to_regval(int voltage) +{ + int offset; + + switch (voltage) { + case 0 ... 4100000 - 1: + return 0; + case 4100000 ... 4200000 - 1: + offset = 1; + break; + case 4200000 ... 4300000 - 1: + offset = 0; + break; + case 4300000 ... 4380000 - 1: + offset = -1; + break; + case 4380000 ... 4440000: + offset = -2; + break; + default: + return 0; + } + + return ((voltage - 4100000) / 20000) + offset; +} + +static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata, + int state, unsigned long delay) +{ + int error; + + error = cpcap_charger_set_state(ddata, 0, 0, 0); + if (error) + return; + + cpcap_charger_update_state(ddata, state); + power_supply_changed(ddata->usb); + schedule_delayed_work(&ddata->detect_work, delay); +} + static void cpcap_usb_detect(struct work_struct *work) { struct cpcap_charger_ddata *ddata; @@ -447,24 +531,67 @@ static void cpcap_usb_detect(struct work_struct *work) if (error) return; + /* Just init the state if a charger is connected with no chrg_det set */ + if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) { + cpcap_charger_update_state(ddata, CPCAP_CHARGER_DETECTING); + + return; + } + + /* + * If battery voltage is higher than charge voltage, it may have been + * charged to 4.35V by Android. Try again in 10 minutes. + */ + if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) { + cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING, + HZ * 60 * 10); + + return; + } + + /* Throttle chrgcurr2 interrupt for charger done and retry */ + switch (ddata->state) { + case CPCAP_CHARGER_CHARGING: + if (s.chrgcurr2) + break; + if (s.chrgcurr1 && s.vbusvld) { + cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DONE, + HZ * 5); + return; + } + break; + case CPCAP_CHARGER_DONE: + if (!s.chrgcurr2) + break; + cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING, + HZ * 5); + return; + default: + break; + } + if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) && s.chrgcurr1) { int max_current; + int vchrg; if (cpcap_charger_battery_found(ddata)) max_current = CPCAP_REG_CRM_ICHRG_1A596; else max_current = CPCAP_REG_CRM_ICHRG_0A532; + vchrg = cpcap_charger_voltage_to_regval(ddata->voltage); error = cpcap_charger_set_state(ddata, - CPCAP_REG_CRM_VCHRG_4V35, + CPCAP_REG_CRM_VCHRG(vchrg), max_current, 0); if (error) goto out_err; + cpcap_charger_update_state(ddata, CPCAP_CHARGER_CHARGING); } else { error = cpcap_charger_set_state(ddata, 0, 0, 0); if (error) goto out_err; + cpcap_charger_update_state(ddata, CPCAP_CHARGER_DISCONNECTED); } power_supply_changed(ddata->usb); @@ -524,7 +651,7 @@ static const char * const cpcap_charger_irqs[] = { "chrg_det", "rvrs_chrg", /* REG_INT1 */ - "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr1", "vbusvld", + "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld", /* REG_INT_3 */ "battdetb", @@ -625,6 +752,7 @@ static int cpcap_charger_probe(struct platform_device *pdev) return -ENOMEM; ddata->dev = &pdev->dev; + ddata->voltage = 4200000; ddata->reg = dev_get_regmap(ddata->dev->parent, NULL); if (!ddata->reg)