linux-kernel - Re: [PATCH] Revert "extcon: axp288: Redo charger type detection a couple of seconds after probe()"

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Date:   Fri, 2 Feb 2018 00:48:42 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "extcon: axp288: Redo charger type detection a
 couple of seconds after probe()"

Hi,

On 01-02-18 22:22, Chanwoo Choi wrote:
> Hi Hans,
> 
> Why don't modify the extcon-axp288.c after revert it?

Fixing the axp288 extcon code properly requires usb-role-switch support
which is not yet in the mainline kernel, I will submit the fix for it
once usb-role-switch support is in the mainline.

> Instead, you sent the patch[1].

Yes this is a preparation patch for the pending extcon-axp288 fix.

Regards,

Hans



  Are you going to send other patch for extcon-axp288.c?
> [1] [PATCH] extcon: int3496: process id-pin first so that we start with the right status
> 
> 
> On 2018년 01월 26일 02:10, Hans de Goede wrote:
>> Redoing the charger type detection to give the usb-role-switch code time
>> to properly set the role-switch is no good for mainline, since the
>> usb-role-switch code is not yet in mainline (my bad, sorry).
>>
>> Also once we've that code there are better ways to fix this which are
>> not prone to racing as doing a retry after 2 seconds is.
>>
>> This reverts commit 50082c17bb1455acacd376ae30dff92f2e1addbd.
>>
>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
>> ---
>>   drivers/extcon/extcon-axp288.c | 32 ++------------------------------
>>   1 file changed, 2 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
>> index 9abc99e8c0a5..901eddd3994b 100644
>> --- a/drivers/extcon/extcon-axp288.c
>> +++ b/drivers/extcon/extcon-axp288.c
>> @@ -1,7 +1,6 @@
>>   /*
>>    * extcon-axp288.c - X-Power AXP288 PMIC extcon cable detection driver
>>    *
>> - * Copyright (C) 2016-2017 Hans de Goede <hdegoede@...hat.com>
>>    * Copyright (C) 2015 Intel Corporation
>>    * Author: Ramakrishna Pallala <ramakrishna.pallala@...el.com>
>>    *
>> @@ -98,11 +97,9 @@ struct axp288_extcon_info {
>>   	struct device *dev;
>>   	struct regmap *regmap;
>>   	struct regmap_irq_chip_data *regmap_irqc;
>> -	struct delayed_work det_work;
>>   	int irq[EXTCON_IRQ_END];
>>   	struct extcon_dev *edev;
>>   	unsigned int previous_cable;
>> -	bool first_detect_done;
>>   };
>>   
>>   /* Power up/down reason string array */
>> @@ -140,25 +137,6 @@ static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
>>   	regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
>>   }
>>   
>> -static void axp288_chrg_detect_complete(struct axp288_extcon_info *info)
>> -{
>> -	/*
>> -	 * We depend on other drivers to do things like mux the data lines,
>> -	 * enable/disable vbus based on the id-pin, etc. Sometimes the BIOS has
>> -	 * not set these things up correctly resulting in the initial charger
>> -	 * cable type detection giving a wrong result and we end up not charging
>> -	 * or charging at only 0.5A.
>> -	 *
>> -	 * So we schedule a second cable type detection after 2 seconds to
>> -	 * give the other drivers time to load and do their thing.
>> -	 */
>> -	if (!info->first_detect_done) {
>> -		queue_delayed_work(system_wq, &info->det_work,
>> -				   msecs_to_jiffies(2000));
>> -		info->first_detect_done = true;
>> -	}
>> -}
>> -
>>   static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
>>   {
>>   	int ret, stat, cfg, pwr_stat;
>> @@ -223,8 +201,6 @@ static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
>>   		info->previous_cable = cable;
>>   	}
>>   
>> -	axp288_chrg_detect_complete(info);
>> -
>>   	return 0;
>>   
>>   dev_det_ret:
>> @@ -246,11 +222,8 @@ static irqreturn_t axp288_extcon_isr(int irq, void *data)
>>   	return IRQ_HANDLED;
>>   }
>>   
>> -static void axp288_extcon_det_work(struct work_struct *work)
>> +static void axp288_extcon_enable(struct axp288_extcon_info *info)
>>   {
>> -	struct axp288_extcon_info *info =
>> -		container_of(work, struct axp288_extcon_info, det_work.work);
>> -
>>   	regmap_update_bits(info->regmap, AXP288_BC_GLOBAL_REG,
>>   						BC_GLOBAL_RUN, 0);
>>   	/* Enable the charger detection logic */
>> @@ -272,7 +245,6 @@ static int axp288_extcon_probe(struct platform_device *pdev)
>>   	info->regmap = axp20x->regmap;
>>   	info->regmap_irqc = axp20x->regmap_irqc;
>>   	info->previous_cable = EXTCON_NONE;
>> -	INIT_DELAYED_WORK(&info->det_work, axp288_extcon_det_work);
>>   
>>   	platform_set_drvdata(pdev, info);
>>   
>> @@ -315,7 +287,7 @@ static int axp288_extcon_probe(struct platform_device *pdev)
>>   	}
>>   
>>   	/* Start charger cable type detection */
>> -	queue_delayed_work(system_wq, &info->det_work, 0);
>> +	axp288_extcon_enable(info);
>>   
>>   	return 0;
>>   }
>>
>