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[92.34.204.253]) by smtp.gmail.com with ESMTPSA id r9-20020a2e94c9000000b0024b4c2a1346sm375318ljh.123.2022.04.15.13.38.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Apr 2022 13:38:50 -0700 (PDT) From: Linus Walleij To: Sebastian Reichel , Marcus Cooper Cc: linux-pm@vger.kernel.org, Matti Vaittinen , Linus Walleij Subject: [PATCH 2/2] power: supply: ab8500: Exit maintenance if too low voltage Date: Fri, 15 Apr 2022 22:36:38 +0200 Message-Id: <20220415203638.361074-2-linus.walleij@linaro.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220415203638.361074-1-linus.walleij@linaro.org> References: <20220415203638.361074-1-linus.walleij@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The maintenance charging is supposedly designed such that the maintenance current compensates for the battery discharge curve, and as the charging progress from CC/CV -> maintenance A -> maintenance B states, we end up on a reasonable voltage to restart ordinary CC/CV charging after the safety timer at the maintenance B state exits. However: old batteries discharge quicker, and in an old battery we might not get to the expiration of the maintenance B timer before the battery is completely depleted and the system powers off with an empty battery. This is hardly the desire of anyone leaving their phone in the charger for a few days! Introduce a second clause in both maintenance states such that we exit the state and return to ordinary CC/CV charging if the voltage drops below charge_restart_voltage_uv or 95% if this is not defined for the battery. Signed-off-by: Linus Walleij --- drivers/power/supply/ab8500_chargalg.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/power/supply/ab8500_chargalg.c b/drivers/power/supply/ab8500_chargalg.c index b9622eb9fc72..1b23b5261881 100644 --- a/drivers/power/supply/ab8500_chargalg.c +++ b/drivers/power/supply/ab8500_chargalg.c @@ -1514,6 +1514,14 @@ static void ab8500_chargalg_algorithm(struct ab8500_chargalg *di) ab8500_chargalg_stop_maintenance_timer(di); ab8500_chargalg_state_to(di, STATE_MAINTENANCE_B_INIT); } + /* + * This happens if the voltage drops too quickly during + * maintenance charging, especially in older batteries. + */ + if (ab8500_chargalg_time_to_restart(di)) { + ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); + dev_info(di->dev, "restarted charging from maintenance state A - battery getting old?\n"); + } break; case STATE_MAINTENANCE_B_INIT: @@ -1538,6 +1546,14 @@ static void ab8500_chargalg_algorithm(struct ab8500_chargalg *di) ab8500_chargalg_stop_maintenance_timer(di); ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); } + /* + * This happens if the voltage drops too quickly during + * maintenance charging, especially in older batteries. + */ + if (ab8500_chargalg_time_to_restart(di)) { + ab8500_chargalg_state_to(di, STATE_NORMAL_INIT); + dev_info(di->dev, "restarted charging from maintenance state B - battery getting old?\n"); + } break; case STATE_TEMP_LOWHIGH_INIT: -- 2.35.1