linux-kernel - Re: [PATCH v2] power: supply: qcom_battmgr: Ignore notifications before initialization

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Message-ID: <a5c22fd2-8967-47ad-b936-4d1fdc4ab64d@linaro.org>
Date: Fri, 12 Jan 2024 10:47:58 +0100
From: neil.armstrong@...aro.org
To: Konrad Dybcio <konrad.dybcio@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>, Sebastian Reichel <sre@...nel.org>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org, Xilin Wu <wuxilin123@...il.com>
Subject: Re: [PATCH v2] power: supply: qcom_battmgr: Ignore notifications
 before initialization

On 03/01/2024 13:36, Konrad Dybcio wrote:
> Commit b43f7ddc2b7a ("power: supply: qcom_battmgr: Register the power
> supplies after PDR is up") moved the devm_power_supply_register() calls
> so that the power supply devices are not registered before we go through
> the entire initialization sequence (power up the ADSP remote processor,
> wait for it to come online, coordinate with userspace..).
> 
> Some firmware versions (e.g. on SM8550) seem to leave battmgr at least
> partly initialized when exiting the bootloader and loading Linux. Check
> if the power supply devices are registered before consuming the battmgr
> notifications.
> 
> Fixes: b43f7ddc2b7a ("power: supply: qcom_battmgr: Register the power supplies after PDR is up")
> Reported-by: Xilin Wu <wuxilin123@...il.com>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
> Changes in v2:
> - Fix the commit title
> - Link to v1: https://lore.kernel.org/linux-arm-msm/d9cf7d9d-60d9-4637-97bf-c9840452899e@linaro.org/T/#t
> ---
>   drivers/power/supply/qcom_battmgr.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/power/supply/qcom_battmgr.c b/drivers/power/supply/qcom_battmgr.c
> index a12e2a66d516..7d85292eb839 100644
> --- a/drivers/power/supply/qcom_battmgr.c
> +++ b/drivers/power/supply/qcom_battmgr.c
> @@ -1271,6 +1271,10 @@ static void qcom_battmgr_callback(const void *data, size_t len, void *priv)
>   	struct qcom_battmgr *battmgr = priv;
>   	unsigned int opcode = le32_to_cpu(hdr->opcode);
>   
> +	/* Ignore the pings that come before Linux cleanly initializes the battmgr stack */
> +	if (!battmgr->bat_psy)
> +		return;
> +
>   	if (opcode == BATTMGR_NOTIFICATION)
>   		qcom_battmgr_notification(battmgr, data, len);
>   	else if (battmgr->variant == QCOM_BATTMGR_SC8280XP)
> 
> ---
> base-commit: 0fef202ac2f8e6d9ad21aead648278f1226b9053
> change-id: 20240103-topic-battmgr2-15c17fac6d35
> 
> Best regards,

Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8650-QRD