From: mkl@pengutronix.de (Marc Kleine-Budde)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v12 10/13] usb: chipidea: add wait vbus lower than OTGSC_BSV before role starts
Date: Thu, 11 Jul 2013 11:31:46 +0200 [thread overview]
Message-ID: <51DE7B82.4030402@pengutronix.de> (raw)
In-Reply-To: <20130711092535.GA11728@nchen-desktop>
On 07/11/2013 11:25 AM, Peter Chen wrote:
> On Thu, Jul 11, 2013 at 09:24:56AM +0200, Marc Kleine-Budde wrote:
>> On 07/11/2013 08:27 AM, Peter Chen wrote:
>>> When the gadget role starts, we need to make sure the vbus is lower
>>> than OTGSC_BSV, or there will be an vbus interrupt since we use
>>> B_SESSION_VALID as vbus interrupt to indicate connect and disconnect.
>>> When the host role starts, it may not be useful to wait vbus to lower
>>> than OTGSC_BSV, but it can indicate some hardware problems like the
>>> vbus is still higher than OTGSC_BSV after we disconnect to host some
>>> time later (500 jiffies currently), which is obvious not correct.
>>
>> Jiffies ist not constant. I think you have to specify the timeout in
>> fractions of HZ. The system ticks with HZ jiffies per second. So a
>> timeout of 500ms is "HZ / 2".
>
> Thanks, I will use msecs_to_jiffies.
even better.
>
>>> +/**
>>> + * hw_wait_reg: wait the register value
>>> + *
>>> + * Sometimes, it needs to wait register value before going on.
>>> + * Eg, when switch to device mode, the vbus value should be lower
>>> + * than OTGSC_BSV before connects to host.
>>> + *
>>> + * @ci: the controller
>>> + * @reg: register index
>>> + * @mask: mast bit
>>> + * @value: the bit value to wait
>>> + * @timeout: timeout to indicate an error
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>
>> Better: timeout in jiffies
>>
>
> As I will use msecs_to_jiffies, @timeout: timeout in millisecond.
Good idea - you might want to use timeout_ms.
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
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next prev parent reply other threads:[~2013-07-11 9:31 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-11 6:27 [PATCH v12 00/13] Add tested id switch and vbus connect detect support for Chipidea Peter Chen
2013-07-11 6:27 ` [PATCH v12 01/13] usb: chipidea: add vbus regulator control Peter Chen
2013-07-11 6:27 ` [PATCH v12 02/13] usb: chipidea: imx: remove vbus regulator operation Peter Chen
2013-07-11 6:37 ` Sascha Hauer
2013-07-11 6:55 ` Peter Chen
2013-07-11 6:27 ` [PATCH v12 03/13] usb: chipidea: udc: otg_set_peripheral is useless for some chipidea users Peter Chen
2013-07-11 6:27 ` [PATCH v12 04/13] usb: chipidea: otg: Add otg file used to access otgsc Peter Chen
2013-07-11 6:27 ` [PATCH v12 05/13] usb: chipidea: Add role init and destory APIs Peter Chen
2013-07-11 6:27 ` [PATCH v12 06/13] usb: chipidea: add otg_cap attribute for otg capable Peter Chen
2013-07-11 15:36 ` Marek Vasut
2013-07-12 2:58 ` Peter Chen
2013-07-12 3:54 ` Marek Vasut
2013-07-12 8:12 ` Alexander Shishkin
2013-07-12 8:25 ` Peter Chen
2013-07-12 9:42 ` Alexander Shishkin
2013-07-12 10:16 ` Peter Chen
2013-07-16 9:45 ` Peter Chen
2013-07-11 6:27 ` [PATCH v12 07/13] usb: chipidea: disable all interrupts and clear all interrupts status Peter Chen
2013-07-11 6:27 ` [PATCH v12 08/13] usb: chipidea: move otg relate things to otg file Peter Chen
2013-07-11 6:27 ` [PATCH v12 09/13] usb: chipidea: add vbus interrupt handler Peter Chen
2013-07-11 6:27 ` [PATCH v12 10/13] usb: chipidea: add wait vbus lower than OTGSC_BSV before role starts Peter Chen
2013-07-11 7:24 ` Marc Kleine-Budde
2013-07-11 9:25 ` Peter Chen
2013-07-11 9:31 ` Marc Kleine-Budde [this message]
2013-07-11 6:27 ` [PATCH v12 11/13] usb: chipidea: udc: misuse flag CI_HDRC_REGS_SHARED and CI_HDRC_PULLUP_ON_VBUS Peter Chen
2013-07-11 6:27 ` [PATCH v12 12/13] usb: chipidea: udc: .pullup is valid when vbus is on at CI_HDRC_PULLUP_ON_VBUS Peter Chen
2013-07-11 6:27 ` [PATCH v12 13/13] usb: chipidea: udc: fix the oops when plugs in usb cable after rmmod gadget Peter Chen
2013-07-11 17:57 ` [PATCH v12 00/13] Add tested id switch and vbus connect detect support for Chipidea Marek Vasut
2013-07-12 3:12 ` Peter Chen
2013-07-12 4:04 ` Marek Vasut
2013-07-12 8:26 ` Peter Chen
2013-07-12 13:18 ` Marek Vasut
2013-07-13 0:36 ` Chen Peter-B29397
2013-07-16 9:43 ` Peter Chen
2013-07-22 1:15 ` Marek Vasut
2013-07-22 1:21 ` Peter Chen
2013-07-22 1:40 ` Marek Vasut
2013-07-22 1:53 ` Peter Chen
2013-07-25 5:55 ` Marek Vasut
2013-07-25 5:58 ` Peter Chen
2013-07-25 12:36 ` Marek Vasut
2013-07-19 14:11 ` Fabio Estevam
2013-07-25 6:05 ` Marek Vasut
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