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Date: Thu, 27 Sep 2012 17:52:23 -0700
From: Anton Vorontsov <anton.vorontsov@...aro.org>
To: mathieu.poirier@...aro.org
Cc: linux-kernel@...r.kernel.org, dwmw2@...radead.org
Subject: Re: [PATCH 39/57] power: ab8500_charger: Prevent auto drop of VBUS
On Tue, Sep 25, 2012 at 10:12:36AM -0600, mathieu.poirier@...aro.org wrote:
> From: Martin Sjoblom <martin.w.sjoblom@...ricsson.com>
>
> Do not set higher current in stepping functionality if VBUS is dropping.
> After VBUS has dropped try to set current once again. If dropping again
> then we have found the maximum capability of the charger.
>
> Signed-off-by: Martin Sjoblom <martin.w.sjoblom@...ricsson.com>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Reviewed-by: Per FORLIN <per.forlin@...ricsson.com>
> ---
> drivers/power/ab8500_charger.c | 166 ++++++++++++++++++++++++++++------------
> 1 files changed, 117 insertions(+), 49 deletions(-)
>
> diff --git a/drivers/power/ab8500_charger.c b/drivers/power/ab8500_charger.c
> index ebeb068..18931e4 100644
> --- a/drivers/power/ab8500_charger.c
> +++ b/drivers/power/ab8500_charger.c
> @@ -55,6 +55,7 @@
> #define MAIN_CH_INPUT_CURR_SHIFT 4
> #define VBUS_IN_CURR_LIM_SHIFT 4
> #define AUTO_VBUS_IN_CURR_LIM_SHIFT 4
> +#define VBUS_IN_CURR_LIM_RETRY_SET_TIME 30 /* seconds */
>
> #define LED_INDICATOR_PWM_ENA 0x01
> #define LED_INDICATOR_PWM_DIS 0x00
> @@ -199,10 +200,15 @@ struct ab8500_charger_usb_state {
> spinlock_t usb_lock;
> };
>
> +struct ab8500_charger_max_usb_in_curr {
> + int usb_type_max;
> + int set_max;
> + int calculated_max;
> +};
[...]
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> - di->is_usb_host = true;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
It seems that you introduced struct max_usb_in_curr for no obvious
reason.
Because of this, there are a lot of churn, and much much longer lines all
over, which hurts readability.
Why not just introduce a usb_curr_set_max and usb_curr_calc_max in di->?
Or something alike, or make things shorter in general, somehow. E.g., why
do you have to repeat usb_? And why repeat max?
struct ab8500_chg_max_usb_in_curr {
int type;
int set;
int calc;
};
This would be at least shorter and still understandable in a context. But
again, I guess we don't need this new struct -- you don't pass it anywhere
anyway.
> di->is_aca_rid = 0;
> break;
> case USB_STAT_HOST_CHG_HS_CHIRP:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> - di->is_usb_host = true;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
> di->is_aca_rid = 0;
> break;
> case USB_STAT_HOST_CHG_HS:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> - di->is_usb_host = true;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
> di->is_aca_rid = 0;
> break;
> case USB_STAT_ACA_RID_C_HS:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P9;
> - di->is_usb_host = false;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
> di->is_aca_rid = 0;
> break;
> case USB_STAT_ACA_RID_A:
> @@ -690,8 +696,7 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
> * can consume (900mA). Closest level is 500mA
> */
> dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> - di->is_usb_host = false;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
> di->is_aca_rid = 1;
> break;
> case USB_STAT_ACA_RID_B:
> @@ -699,38 +704,35 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
> * Dedicated charger level minus 120mA (20mA for ACA and
> * 100mA for potential accessory). Closest level is 1300mA
> */
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P3;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
> dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
> - di->max_usb_in_curr);
> - di->is_usb_host = false;
> + di->max_usb_in_curr.usb_type_max);
> di->is_aca_rid = 1;
> break;
> case USB_STAT_HOST_CHG_NM:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> - di->is_usb_host = true;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
> di->is_aca_rid = 0;
> break;
> case USB_STAT_DEDICATED_CHG:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
> - di->is_usb_host = false;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
> di->is_aca_rid = 0;
> break;
> case USB_STAT_ACA_RID_C_HS_CHIRP:
> case USB_STAT_ACA_RID_C_NM:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
> - di->is_usb_host = false;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
> di->is_aca_rid = 1;
> break;
> case USB_STAT_NOT_CONFIGURED:
> if (di->vbus_detected) {
> di->usb_device_is_unrecognised = true;
> dev_dbg(di->dev, "USB Type - Legacy charger.\n");
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
> + di->max_usb_in_curr.usb_type_max =
> + USB_CH_IP_CUR_LVL_1P5;
> break;
> }
> case USB_STAT_HM_IDGND:
> dev_err(di->dev, "USB Type - Charging not allowed\n");
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
> ret = -ENXIO;
> break;
> case USB_STAT_RESERVED:
> @@ -743,9 +745,11 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
> }
> if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
> dev_dbg(di->dev, "USB Type - Charging not allowed\n");
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
> + di->max_usb_in_curr.usb_type_max =
> + USB_CH_IP_CUR_LVL_0P05;
> dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
> - link_status, di->max_usb_in_curr);
> + link_status,
> + di->max_usb_in_curr.usb_type_max);
> ret = -ENXIO;
> break;
> }
> @@ -754,23 +758,24 @@ static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
> case USB_STAT_CARKIT_2:
> case USB_STAT_ACA_DOCK_CHARGER:
> case USB_STAT_CHARGER_LINE_1:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
> dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
> - di->max_usb_in_curr);
> + di->max_usb_in_curr.usb_type_max);
> case USB_STAT_NOT_VALID_LINK:
> dev_err(di->dev, "USB Type invalid - try charging anyway\n");
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
> break;
>
> default:
> dev_err(di->dev, "USB Type - Unknown\n");
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
> ret = -ENXIO;
> break;
> };
>
> + di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
> dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
> - link_status, di->max_usb_in_curr);
> + link_status, di->max_usb_in_curr.set_max);
>
> return ret;
> }
> @@ -1074,28 +1079,48 @@ static int ab8500_vbus_in_curr_to_regval(int curr)
> */
> static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
> {
> + int ret = 0;
> switch (di->usb_state.usb_current) {
> case 100:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P09;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
> break;
> case 200:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P19;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
> break;
> case 300:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P29;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
> break;
> case 400:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P38;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
> break;
> case 500:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
> break;
> default:
> - di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
> - return -1;
> + di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
> + ret = -EPERM;
> break;
> };
> - return 0;
> + di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
> + return ret;
> +}
> +
> +/**
> + * ab8500_charger_check_continue_stepping() - Check to allow stepping
> + * @di: pointer to the ab8500_charger structure
> + * @reg: select what charger register to check
> + *
> + * Check if current stepping should be allowed to continue.
> + * Checks if charger source has not collapsed. If it has, further stepping
> + * is not allowed.
> + */
> +static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
> + int reg)
> +{
> + if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
> + return !di->flags.vbus_drop_end;
> + else
> + return true;
No need for else.
> }
>
> /**
> @@ -1220,7 +1245,8 @@ static int ab8500_charger_set_current(struct ab8500_charger *di,
> usleep_range(step_udelay, step_udelay * 2);
> }
> } else {
> - for (i = prev_curr_index + 1; i <= curr_index; i++) {
> + bool allow = true;
Needs empty line here.
> + for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
> dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
> (u8) i << shift_value, reg);
> ret = abx500_set_register_interruptible(di->dev,
> @@ -1231,6 +1257,8 @@ static int ab8500_charger_set_current(struct ab8500_charger *di,
> }
> if (i != curr_index)
> usleep_range(step_udelay, step_udelay * 2);
> +
> + allow = ab8500_charger_check_continue_stepping(di, reg);
> }
> }
>
> @@ -1255,6 +1283,8 @@ static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
>
> /* We should always use to lowest current limit */
> min_value = min(di->bat->chg_params->usb_curr_max, ich_in);
> + if (di->max_usb_in_curr.set_max > 0)
> + min_value = min(di->max_usb_in_curr.set_max, min_value);
>
> switch (min_value) {
> case 100:
> @@ -1609,7 +1639,7 @@ static int ab8500_charger_usb_en(struct ux500_charger *charger,
>
> /* USBChInputCurr: current that can be drawn from the usb */
> ret = ab8500_charger_set_vbus_in_curr(di,
> - di->max_usb_in_curr);
> + di->max_usb_in_curr.usb_type_max);
> if (ret) {
> dev_err(di->dev, "setting USBChInputCurr failed\n");
> return ret;
> @@ -1943,10 +1973,12 @@ static void ab8500_charger_check_vbat_work(struct work_struct *work)
> (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
> di->vbat > VBAT_TRESH_IP_CUR_RED))) {
>
> - dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
> - " old: %d\n", di->max_usb_in_curr, di->vbat,
> - di->old_vbat);
> - ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
> + dev_dbg(di->dev, "Vbat did cross threshold, curr: %d,",
> + di->max_usb_in_curr.usb_type_max);
> + dev_dbg(di->dev, " new: %d, old: %d\n",
> + di->vbat, di->old_vbat);
> + ab8500_charger_set_vbus_in_curr(di,
> + di->max_usb_in_curr.usb_type_max);
> power_supply_changed(&di->usb_chg.psy);
> }
>
> @@ -2224,7 +2256,8 @@ static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
>
> /* Update maximum input current if USB enumeration is not detected */
> if (!di->usb.charger_online) {
> - ret = ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
> + ret = ab8500_charger_set_vbus_in_curr(di,
> + di->max_usb_in_curr.usb_type_max);
> if (ret)
> return;
> }
> @@ -2403,7 +2436,7 @@ static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
> if (!ab8500_charger_get_usb_cur(di)) {
> /* Update maximum input current */
> ret = ab8500_charger_set_vbus_in_curr(di,
> - di->max_usb_in_curr);
> + di->max_usb_in_curr.usb_type_max);
> if (ret)
> return;
>
> @@ -2617,15 +2650,45 @@ static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
> {
> struct ab8500_charger *di = container_of(work,
> struct ab8500_charger, vbus_drop_end_work.work);
> + int ret;
> + u8 reg_value;
>
> di->flags.vbus_drop_end = false;
>
> /* Reset the drop counter */
> abx500_set_register_interruptible(di->dev,
> AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
> + ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
> + AB8500_CH_USBCH_STAT2_REG,
> + ®_value);
> + if (ret < 0) {
> + dev_err(di->dev, "%s ab8500 read failed\n", __func__);
> + } else {
> + int curr = ab8500_charger_vbus_in_curr_map[
> + reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
empty line needed.
> + if (di->max_usb_in_curr.calculated_max != curr) {
> + /* USB source is collapsing */
> + di->max_usb_in_curr.calculated_max = curr;
> + dev_dbg(di->dev,
> + "VBUS input current limiting to %d mA\n",
> + di->max_usb_in_curr.calculated_max);
> + } else {
> + /*
> + * USB source can not give more than this amount.
> + * Taking more will collapse the source.
> + */
> + di->max_usb_in_curr.set_max =
> + di->max_usb_in_curr.calculated_max;
> + dev_dbg(di->dev,
> + "VBUS input current limited to %d mA\n",
> + di->max_usb_in_curr.set_max);
> + return;
> + }
> + }
>
> if (di->usb.charger_connected)
> - ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
> + ab8500_charger_set_vbus_in_curr(di,
> + di->max_usb_in_curr.usb_type_max);
> }
>
> /**
> @@ -2779,8 +2842,13 @@ static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
>
> dev_dbg(di->dev, "VBUS charger drop ended\n");
> di->flags.vbus_drop_end = true;
> +
> + /*
> + * VBUS might have dropped due to bad connection.
> + * Schedule a new input limit set to the value SW requests.
> + */
> queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
> - round_jiffies(30 * HZ));
> + round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
>
> return IRQ_HANDLED;
> }
> --
> 1.7.5.4
>
>
--
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