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Wed, 11 Nov 2026 12:56:36 -0800 (PST) Received: from neuromancer ([75.28.21.198]) by smtp.gmail.com with ESMTPSA id 5614622812f47-56906036028sm6564231b6e.11.2026.11.11.12.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 12:56:36 -0800 (PST) From: Chris Morgan To: linux-rockchip@lists.infradead.org Cc: mfd@lists.linux.dev, linux-pm@vger.kernel.org, maccraft123mc@gmail.com, heiko@sntech.de, lee@kernel.org, sre@kernel.org, Chris Morgan , Zetarancio Subject: [PATCH V4 6/7] power: supply: rk817-charger: Clear SYS_CAN_SD reg by default Date: Wed, 11 Nov 2026 14:56:26 -0600 Message-ID: <20261111205627.56652-7-macroalpha82@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261111205627.56652-1-macroalpha82@gmail.com> References: <20261111205627.56652-1-macroalpha82@gmail.com> X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Chris Morgan The BSP driver for the rk817 charger by default clears the SYS_CAN_SD. This register tells the PMIC that the system voltage can be shut down in battery off mode. Though the BSP driver also included a way to bypass this behavior, no boards have been observed using the override. When this register is not cleared, it can result in a persistent power drain on certain devices while the device is off, as observed by users. Fixes: 11cb8da0189b ("power: supply: Add charger driver for Rockchip RK817") Signed-off-by: Chris Morgan Suggested-by: Zetarancio Acked-by: Lee Jones --- drivers/power/supply/rk817_charger.c | 9 +++++++++ include/linux/mfd/rk808.h | 1 + 2 files changed, 10 insertions(+) diff --git a/drivers/power/supply/rk817_charger.c b/drivers/power/supply/rk817_charger.c index d334941ade5c..9a8d14691f9a 100644 --- a/drivers/power/supply/rk817_charger.c +++ b/drivers/power/supply/rk817_charger.c @@ -1187,6 +1187,15 @@ static int rk817_battery_init(struct rk817_charger *charger, regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN, (0x01 << 3)); + /* + * Do not shut down the system voltage in bat_off mode. The BSP driver + * cleared this bit for all devices unless a specific device tree + * parameter was used, however I have yet to see such parameter on any + * device. + */ + regmap_clear_bits(rk808->regmap, + RK817_PMIC_CHRG_TERM, RK817_SYS_CAN_SD); + return 0; } diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h index 72419d311626..2bc58de53d82 100644 --- a/include/linux/mfd/rk808.h +++ b/include/linux/mfd/rk808.h @@ -1297,6 +1297,7 @@ enum rk809_reg_id { #define RK817_USB_ILIM_EN (0x01 << 3) #define RK817_USB_ILIM_SEL (0x07 << 0) #define RK817_PMIC_CHRG_TERM 0xe6 +#define RK817_SYS_CAN_SD (0x01 << 7) #define RK817_CHRG_TERM_ANA_DIG (0x01 << 2) #define RK817_CHRG_TERM_ANA_SEL (0x03 << 0) #define RK817_CHRG_EN (0x01 << 6) -- 2.53.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A15EF606A32E for ; 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Wed, 11 Nov 2026 12:56:36 -0800 (PST) Received: from neuromancer ([75.28.21.198]) by smtp.gmail.com with ESMTPSA id 5614622812f47-56906036028sm6564231b6e.11.2026.11.11.12.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 12:56:36 -0800 (PST) From: Chris Morgan To: linux-rockchip@lists.infradead.org Cc: mfd@lists.linux.dev, linux-pm@vger.kernel.org, maccraft123mc@gmail.com, heiko@sntech.de, lee@kernel.org, sre@kernel.org, Chris Morgan , Zetarancio Subject: [PATCH V4 6/7] power: supply: rk817-charger: Clear SYS_CAN_SD reg by default Date: Wed, 11 Nov 2026 14:56:26 -0600 Message-ID: <20261111205627.56652-7-macroalpha82@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261111205627.56652-1-macroalpha82@gmail.com> References: <20261111205627.56652-1-macroalpha82@gmail.com> X-Archived-By: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261111_125638_240726_768F51A7 X-CRM114-Status: GOOD ( 13.65 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Chris Morgan The BSP driver for the rk817 charger by default clears the SYS_CAN_SD. This register tells the PMIC that the system voltage can be shut down in battery off mode. Though the BSP driver also included a way to bypass this behavior, no boards have been observed using the override. When this register is not cleared, it can result in a persistent power drain on certain devices while the device is off, as observed by users. Fixes: 11cb8da0189b ("power: supply: Add charger driver for Rockchip RK817") Signed-off-by: Chris Morgan Suggested-by: Zetarancio Acked-by: Lee Jones --- drivers/power/supply/rk817_charger.c | 9 +++++++++ include/linux/mfd/rk808.h | 1 + 2 files changed, 10 insertions(+) diff --git a/drivers/power/supply/rk817_charger.c b/drivers/power/supply/rk817_charger.c index d334941ade5c..9a8d14691f9a 100644 --- a/drivers/power/supply/rk817_charger.c +++ b/drivers/power/supply/rk817_charger.c @@ -1187,6 +1187,15 @@ static int rk817_battery_init(struct rk817_charger *charger, regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN, (0x01 << 3)); + /* + * Do not shut down the system voltage in bat_off mode. The BSP driver + * cleared this bit for all devices unless a specific device tree + * parameter was used, however I have yet to see such parameter on any + * device. + */ + regmap_clear_bits(rk808->regmap, + RK817_PMIC_CHRG_TERM, RK817_SYS_CAN_SD); + return 0; } diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h index 72419d311626..2bc58de53d82 100644 --- a/include/linux/mfd/rk808.h +++ b/include/linux/mfd/rk808.h @@ -1297,6 +1297,7 @@ enum rk809_reg_id { #define RK817_USB_ILIM_EN (0x01 << 3) #define RK817_USB_ILIM_SEL (0x07 << 0) #define RK817_PMIC_CHRG_TERM 0xe6 +#define RK817_SYS_CAN_SD (0x01 << 7) #define RK817_CHRG_TERM_ANA_DIG (0x01 << 2) #define RK817_CHRG_TERM_ANA_SEL (0x03 << 0) #define RK817_CHRG_EN (0x01 << 6) -- 2.53.0 _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip