From: Andreas Kemnade <andreas@kemnade.info>
To: Tony Lindgren <tony@atomide.com>
Cc: "H. Nikolaus Schaller" <hns@goldelico.com>,
Bin Liu <b-liu@ti.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linux USB Mailing List <linux-usb@vger.kernel.org>,
linux-omap <linux-omap@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Discussions about the Letux Kernel
<letux-kernel@openphoenux.org>
Subject: Re: [Letux-kernel] [PATCH v2] musb: omap2430: do not assume balanced enable()/disable()
Date: Thu, 4 Aug 2016 18:31:29 +0200 [thread overview]
Message-ID: <20160804183129.2e0cac71@aktux> (raw)
In-Reply-To: <20160804142919.GG28140@atomide.com>
Hi,
On Thu, 4 Aug 2016 07:29:19 -0700
Tony Lindgren <tony@atomide.com> wrote:
> Hi,
>
> * H. Nikolaus Schaller <hns@goldelico.com> [160803 10:07]:
> > All this prevents detection of cable plugin-events and VBUS
> > measurement and setting OTG_EN before charging is attempted.
>
> So I gave this patch a try but it now blocks all deeper SoC idle
> states as the PHY stays active. I think the real fix is to make
> sure the charger behaves independent of the USB PHY state. So
> probably this needs to be fixed in phy-twl4030-usb.c and
> twl4030_charger.c instead. Now it sounds like we're also shutting
> down the charger with the USB PHY.
>
Then there is another power management issue. The patch is not about
fixing every pm issue in musb. That is not only about charging, it is
about enabling/disabling() the phy unbalanced:
Again what happens here without the patch:
musb will be initialized:
omap2430_musb_disable()
calls phy_power_off(), phy will be disabled,
phy->power_count goes to -1.
gadget driver is loaded.
musb_start() is called
omap2430_musb_enable() is called
calls phy_power_on(),
phy->power_count goes to 0,
phy is not powered on because power_count != 1
-> no gadget working, no charging.
Regards
Andreas
next prev parent reply other threads:[~2016-08-04 16:31 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-03 15:38 [PATCH v2] musb: omap2430: do not assume balanced enable()/disable() Andreas Kemnade
2016-08-03 17:07 ` [Letux-kernel] " H. Nikolaus Schaller
2016-08-04 14:29 ` Tony Lindgren
2016-08-04 14:49 ` H. Nikolaus Schaller
2016-08-04 15:01 ` Tony Lindgren
2016-08-04 20:59 ` Andreas Kemnade
2016-08-04 16:31 ` Andreas Kemnade [this message]
2016-08-04 16:44 ` Andreas Kemnade
2016-08-05 13:55 ` Tony Lindgren
2016-08-05 15:20 ` Andreas Kemnade
2016-08-06 6:21 ` Tony Lindgren
2016-08-09 5:35 ` Andreas Kemnade
2016-08-11 18:25 ` Tony Lindgren
2016-09-09 19:27 ` [v2] " Laurent Pinchart
2016-09-09 20:08 ` Tony Lindgren
2016-09-09 20:21 ` Laurent Pinchart
2016-09-09 20:40 ` Andreas Kemnade
2016-09-09 20:55 ` Tony Lindgren
2016-09-09 20:51 ` Tony Lindgren
2016-09-09 21:22 ` Andreas Kemnade
2016-09-09 21:33 ` Tony Lindgren
2016-09-09 23:40 ` Tony Lindgren
2016-09-10 11:27 ` Andreas Kemnade
2016-09-10 13:07 ` Tony Lindgren
2016-09-11 9:06 ` Laurent Pinchart
2016-09-12 14:35 ` Tony Lindgren
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