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From: "Heiko Stübner" <heiko@sntech.de>
To: Frank Wang <frank.wang@rock-chips.com>
Cc: dianders@chromium.org, linux@roeck-us.net, groeck@chromium.org,
	jwerner@chromium.org, kishon@ti.com, robh+dt@kernel.org,
	pawel.moll@arm.com, mark.rutland@arm.com,
	ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-usb@vger.kernel.org, linux-rockchip@lists.infradead.org,
	xzy.xu@rock-chips.com, kever.yang@rock-chips.com,
	huangtao@rock-chips.com, william.wu@rock-chips.com
Subject: Re: [PATCH v5 2/2] phy: rockchip-inno-usb2: add a new driver for Rockchip usb2phy
Date: Wed, 15 Jun 2016 11:04:20 +0200	[thread overview]
Message-ID: <20086422.3ieDmpZrvB@diego> (raw)
In-Reply-To: <44bb6bf0-cf86-c440-665a-b0d441ce4427@rock-chips.com>

Hi Frank,

Am Mittwoch, 15. Juni 2016, 11:23:26 schrieb Frank Wang:
> On 2016/6/14 21:27, Heiko Stübner wrote:
> > Am Montag, 13. Juni 2016, 10:10:10 schrieb Frank Wang:
> >> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
> >> than rk3288 and before, and most of phy-related registers are also
> >> different from the past, so a new phy driver is required necessarily.
> >> 
> >> Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
> >> ---
> >> 
> >> Changes in v5:
> >>   - Added 'reg' in the data block to match the different phy-blocks in
> >>   dt.
> >> 
> >> Changes in v4:
> >>   - Removed some processes related to 'vbus_host-supply'.
> >> 
> >> Changes in v3:
> >>   - Resolved the mapping defect between fixed value in driver and the
> >> 
> >> property in devicetree.
> >> 
> >>   - Optimized 480m output clock register function.
> >>   - Code cleanup.
> >> 
> >> Changes in v2:
> >>   - Changed vbus_host operation from gpio to regulator in *_probe.
> >>   - Improved the fault treatment relate to 480m clock register.
> >>   - Cleaned up some meaningless codes in *_clk480m_disable.
> >>   - made more clear the comment of *_sm_work.
> >>   
> >>   drivers/phy/Kconfig                  |    7 +
> >>   drivers/phy/Makefile                 |    1 +
> >>   drivers/phy/phy-rockchip-inno-usb2.c |  645
> >> 
> >> ++++++++++++++++++++++++++++++++++ 3 files changed, 653 insertions(+)
> >> 
> >> [...]
> >> 
> >> +
> >> +static int rockchip_usb2phy_exit(struct phy *phy)
> >> +{
> >> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> >> +
> >> 
> > 	if (!rport->port_cfg)
> > 	
> > 		return 0;
> >> 
> >> +	if (rport->port_id == USB2PHY_PORT_HOST)
> >> +		cancel_delayed_work_sync(&rport->sm_work);
> >> +
> > 
> > you will also need to resume the port here, if it is suspended at this
> > point, as phy_power_off gets called after phy_exit and would probably
> > produce clk enable/disable mismatches otherwise.
> 
> Hmm, from my personal point of view, when canceling sm_work here, it may
> not cause the port goes to suspend, isn't it? besides, clk only prepared
> in *_usb2phy_resume(), and unprepared in *_usb2phy_suspend(), so if we
> resume port here,  the prepare_count of clk will be increased again, I
> am afraid this is not correct, and am I wrong? would you like to tell me
> more details?

usb2phy_resume gets called both initially through phy_power_on as well.
So it's on but through the first scheduled work call, might get suspended when 
nothing is connected. (clk_enable and clk_disable will run).
If nothing is connected on unload phy_power_off will get called while the 
clock actually is still disabled.

So I think it's either resuming on exit, or at least making sure to do nothing 
in that case in the phy_power_off callback of the driver.

  reply	other threads:[~2016-06-15  9:04 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-13  2:10 [PATCH v5 0/2] Add a new Rockchip usb2 phy driver Frank Wang
2016-06-13  2:10 ` [PATCH v5 1/2] Documentation: bindings: add DT documentation for Rockchip USB2PHY Frank Wang
2016-06-13  8:38   ` Heiko Stübner
2016-06-14 13:28     ` Heiko Stübner
2016-06-15  1:24       ` Frank Wang
2016-06-14 22:26   ` Rob Herring
2016-06-13  2:10 ` [PATCH v5 2/2] phy: rockchip-inno-usb2: add a new driver for Rockchip usb2phy Frank Wang
2016-06-14 13:27   ` Heiko Stübner
2016-06-14 13:50     ` Guenter Roeck
2016-06-14 14:00       ` Heiko Stübner
2016-06-15  1:14         ` Frank Wang
2016-06-15 15:47           ` Guenter Roeck
2016-06-16  1:47             ` Frank Wang
2016-06-16 13:12               ` Guenter Roeck
2016-06-17  0:57                 ` Frank Wang
2016-06-15  3:23     ` Frank Wang
2016-06-15  9:04       ` Heiko Stübner [this message]
2016-06-15 10:58         ` Frank Wang
2016-06-15 18:49           ` Heiko Stübner
2016-06-14 14:52   ` Guenter Roeck
2016-06-14 15:20     ` Heiko Stübner
2016-06-17 11:54   ` Kishon Vijay Abraham I
2016-06-17 16:46     ` Heiko Stübner
2016-06-29 14:14       ` Kishon Vijay Abraham I
2016-06-29 14:27         ` Heiko Stuebner

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