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Wysocki" , Mika Westerberg , Mark Gross , Andy Shevchenko , Wolfram Sang , Lee Jones , Sebastian Reichel , MyungJoo Ham , Chanwoo Choi , Ard Biesheuvel , Len Brown , linux-acpi@vger.kernel.org, Yauhen Kharuzhy , Tsuchiya Yuto , Fabio Aiuto , platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org References: <20220130204557.15662-1-hdegoede@redhat.com> <20220130204557.15662-13-hdegoede@redhat.com> From: Hans de Goede In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Hi, On 1/31/22 14:48, Andy Shevchenko wrote: > On Sun, Jan 30, 2022 at 09:45:49PM +0100, Hans de Goede wrote: >> From: Yauhen Kharuzhy >> >> Add a "linux,pump-express-vbus-max" property which indicates if the Pump >> Express+ protocol should be used to increase the charging protocol. >> >> If this new property is set and a DCP charger is detected then request >> a higher charging voltage through the Pump Express+ protocol. >> >> So far this new property is only used on x86/ACPI (non devicetree) devs, >> IOW it is not used in actual devicetree files. The devicetree-bindings >> maintainers have requested properties like these to not be added to the >> devicetree-bindings, so the new property is deliberately not added >> to the existing devicetree-bindings. >> >> Changes by Hans de Goede: >> - Port to my bq25890 patch-series + various cleanups >> - Make behavior configurable through a new "linux,pump-express-vbus-max" >> device-property >> - Sleep 1 second before re-checking the Vbus voltage after requesting >> it to be raised, to ensure that the ADC has time to sampled the new Vbus >> - Add VBUSV bq25890_tables[] entry and use it in bq25890_get_vbus_voltage() >> - Tweak commit message > > ... > >> +static void bq25890_pump_express_work(struct work_struct *data) >> +{ >> + struct bq25890_device *bq = >> + container_of(data, struct bq25890_device, pump_express_work.work); >> + int voltage, i, ret; >> + >> + dev_dbg(bq->dev, "Start to request input voltage increasing\n"); >> + >> + /* Enable current pulse voltage control protocol */ >> + ret = bq25890_field_write(bq, F_PUMPX_EN, 1); >> + if (ret < 0) >> + goto error_print; >> + >> + for (i = 0; i < PUMP_EXPRESS_MAX_TRIES; i++) { > >> + voltage = bq25890_get_vbus_voltage(bq); >> + if (voltage < 0) >> + goto error_print; > > It also can be (at least in align with the rest error paths) > > ret = bq25890_get_vbus_voltage(bq); > if (ret < 0) > goto error_print; > voltage = ret; > > followed up (but not necessarily)... The suggested pattern is useful when ret needs to be set on the error-exit path, but we are not doing that here. So I prefer to just keep this as is. Regards, Hans > >> + dev_dbg(bq->dev, "input voltage = %d uV\n", voltage); >> + >> + if ((voltage + PUMP_EXPRESS_VBUS_MARGIN_uV) > >> + bq->pump_express_vbus_max) >> + break; >> + >> + ret = bq25890_field_write(bq, F_PUMPX_UP, 1); >> + if (ret < 0) >> + goto error_print; >> + >> + /* Note a single PUMPX up pulse-sequence takes 2.1s */ >> + ret = regmap_field_read_poll_timeout(bq->rmap_fields[F_PUMPX_UP], >> + ret, !ret, 100000, 3000000); >> + if (ret < 0) >> + goto error_print; >> + >> + /* Make sure ADC has sampled Vbus before checking again */ >> + msleep(1000); >> + } >> + >> + bq25890_field_write(bq, F_PUMPX_EN, 0); >> + >> + dev_info(bq->dev, "Hi-voltage charging requested, input voltage is %d mV\n", >> + voltage); > >> + return; >> +error_print: > > if (ret < 0) > > But it's up to you. > >> + dev_err(bq->dev, "Failed to request hi-voltage charging\n"); >> +} >