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Date: Fri, 09 Oct 2009 18:55:03 +0300
From: Roger Quadros <ext-roger.quadros@...ia.com>
To: Samuel Ortiz <sameo@...ux.intel.com>
CC: ext Roger Quadros <quadros.roger@...il.com>,
"tony@...mide.com" <tony@...mide.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
"Balbi Felipe (Nokia-D/Helsinki)" <felipe.balbi@...ia.com>,
Felipe Contreras <felipe.contreras@...il.com>,
jouni.hogander@...ia.com
Subject: Re: [PATCH v2] twl4030: Fix boot with twl4030 usb transceiver enabled
Hi,
I just observed that this patch does not work as intended with 2.6.31.3
It seems that twl4030_usb_probe() and hence twl4030_usb_ldo_init() is called
before the required regulators have been 'linked' to the device in
twl4030-core.c, thus causing regulator_get(twl->dev, "usb3v1"); to fail, and the
boot lockup
Isn't there a better way to avoid such a situation?
cheers,
-roger
ext Roger Quadros wrote:
> Hi Samuel,
>
> What is the status of this patch?
> Without this patch we are unable to boot on systems using musb usb controller.
>
> cheers,
> -roger.
>
> On Thu, Oct 1, 2009 at 11:25 AM, Roger Quadros
> <ext-roger.quadros@...ia.com> wrote:
>> The usb regulator supplies (usb1v5, usb1v8 & usb3v1) must be available
>> before adding the twl4030_usb child, else twl4030_usb_ldo_init() will
>> always fail thus causing boot lock-up.
>>
>> This patch fixes boot on OMAP systems using the twl4030 usb transceiver.
>> CONFIG_TWL4030_USB=y
>>
>> Signed-off-by: Roger Quadros <ext-roger.quadros@...ia.com>
>> ---
>> drivers/mfd/twl4030-core.c | 89 ++++++++++++++++++++++---------------------
>> 1 files changed, 46 insertions(+), 43 deletions(-)
>>
>> diff --git a/drivers/mfd/twl4030-core.c b/drivers/mfd/twl4030-core.c
>> index e424cf6..e832e97 100644
>> --- a/drivers/mfd/twl4030-core.c
>> +++ b/drivers/mfd/twl4030-core.c
>> @@ -480,7 +480,6 @@ static int
>> add_children(struct twl4030_platform_data *pdata, unsigned long features)
>> {
>> struct device *child;
>> - struct device *usb_transceiver = NULL;
>>
>> if (twl_has_bci() && pdata->bci && !(features & TPS_SUBSET)) {
>> child = add_child(3, "twl4030_bci",
>> @@ -532,16 +531,61 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
>> }
>>
>> if (twl_has_usb() && pdata->usb) {
>> +
>> + static struct regulator_consumer_supply usb1v5 = {
>> + .supply = "usb1v5",
>> + };
>> + static struct regulator_consumer_supply usb1v8 = {
>> + .supply = "usb1v8",
>> + };
>> + static struct regulator_consumer_supply usb3v1 = {
>> + .supply = "usb3v1",
>> + };
>> +
>> + /* First add the regulators so that they can be used by transceiver */
>> + if (twl_has_regulator()) {
>> + /* this is a template that gets copied */
>> + struct regulator_init_data usb_fixed = {
>> + .constraints.valid_modes_mask =
>> + REGULATOR_MODE_NORMAL
>> + | REGULATOR_MODE_STANDBY,
>> + .constraints.valid_ops_mask =
>> + REGULATOR_CHANGE_MODE
>> + | REGULATOR_CHANGE_STATUS,
>> + };
>> +
>> + child = add_regulator_linked(TWL4030_REG_VUSB1V5,
>> + &usb_fixed, &usb1v5, 1);
>> + if (IS_ERR(child))
>> + return PTR_ERR(child);
>> +
>> + child = add_regulator_linked(TWL4030_REG_VUSB1V8,
>> + &usb_fixed, &usb1v8, 1);
>> + if (IS_ERR(child))
>> + return PTR_ERR(child);
>> +
>> + child = add_regulator_linked(TWL4030_REG_VUSB3V1,
>> + &usb_fixed, &usb3v1, 1);
>> + if (IS_ERR(child))
>> + return PTR_ERR(child);
>> +
>> + }
>> +
>> child = add_child(0, "twl4030_usb",
>> pdata->usb, sizeof(*pdata->usb),
>> true,
>> /* irq0 = USB_PRES, irq1 = USB */
>> pdata->irq_base + 8 + 2, pdata->irq_base + 4);
>> +
>> if (IS_ERR(child))
>> return PTR_ERR(child);
>>
>> /* we need to connect regulators to this transceiver */
>> - usb_transceiver = child;
>> + if (twl_has_regulator() && child) {
>> + usb1v5.dev = child;
>> + usb1v8.dev = child;
>> + usb3v1.dev = child;
>> + }
>> }
>>
>> if (twl_has_watchdog()) {
>> @@ -580,47 +624,6 @@ add_children(struct twl4030_platform_data *pdata, unsigned long features)
>> return PTR_ERR(child);
>> }
>>
>> - if (twl_has_regulator() && usb_transceiver) {
>> - static struct regulator_consumer_supply usb1v5 = {
>> - .supply = "usb1v5",
>> - };
>> - static struct regulator_consumer_supply usb1v8 = {
>> - .supply = "usb1v8",
>> - };
>> - static struct regulator_consumer_supply usb3v1 = {
>> - .supply = "usb3v1",
>> - };
>> -
>> - /* this is a template that gets copied */
>> - struct regulator_init_data usb_fixed = {
>> - .constraints.valid_modes_mask =
>> - REGULATOR_MODE_NORMAL
>> - | REGULATOR_MODE_STANDBY,
>> - .constraints.valid_ops_mask =
>> - REGULATOR_CHANGE_MODE
>> - | REGULATOR_CHANGE_STATUS,
>> - };
>> -
>> - usb1v5.dev = usb_transceiver;
>> - usb1v8.dev = usb_transceiver;
>> - usb3v1.dev = usb_transceiver;
>> -
>> - child = add_regulator_linked(TWL4030_REG_VUSB1V5, &usb_fixed,
>> - &usb1v5, 1);
>> - if (IS_ERR(child))
>> - return PTR_ERR(child);
>> -
>> - child = add_regulator_linked(TWL4030_REG_VUSB1V8, &usb_fixed,
>> - &usb1v8, 1);
>> - if (IS_ERR(child))
>> - return PTR_ERR(child);
>> -
>> - child = add_regulator_linked(TWL4030_REG_VUSB3V1, &usb_fixed,
>> - &usb3v1, 1);
>> - if (IS_ERR(child))
>> - return PTR_ERR(child);
>> - }
>> -
>> /* maybe add LDOs that are omitted on cost-reduced parts */
>> if (twl_has_regulator() && !(features & TPS_SUBSET)) {
>> child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2);
>> --
>> 1.6.0.4
>>
>> --
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