Hi Frank,
Am Mittwoch, 15. Juni 2016, 18:58:43 schrieb Frank Wang:
> On 2016/6/15 17:04, Heiko Stübner wrote:
> > 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@xxxxxxxxxxxxxx>
> >>>> ---
> >>>>
> >>>> 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.
>
> Well, I got what you mean. I saw phy_power_on() gets called twice at
> ehci/ohci driver probe time, one is at pdata->power_on(); another is at
> usb_add_hcd(), so after that, the power_count of phy increases to two.
> however, when ehci/ohci driver goes to suspend, there is only once to
> call phy_power_off(), and the power_count of phy decreases to 1, so our
> usb2phy_resume() could not be invoked :-) .
>
> If so, is it still need to care it?
You should never have to rely on oddities in other drivers :-)
> How about use suspended member of
> rockchip_usb2phy_port as a conditional to check in *_usb2phy_suspend(),
> if necessary.
That looks also sane and should work.
Heiko
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