On Mon 11 Oct 08:24 PDT 2021, khs...@codeaurora.org wrote: > On 2021-10-08 09:44, Bjorn Andersson wrote: > > On Fri 08 Oct 09:07 PDT 2021, khs...@codeaurora.org wrote: > > > > > On 2021-10-07 15:34, Stephen Boyd wrote: > > > > Quoting khs...@codeaurora.org (2021-10-07 13:28:12) > > > > > On 2021-10-07 13:06, Bjorn Andersson wrote: > > > > > > On Thu 07 Oct 12:51 PDT 2021, khs...@codeaurora.org wrote: > > > > > > > > > > > >> On 2021-10-06 10:31, Bjorn Andersson wrote: > > > > > >> > On Wed 06 Oct 08:37 PDT 2021, khs...@codeaurora.org wrote: > > > > > >> > > > > > > >> > > On 2021-10-05 19:10, Bjorn Andersson wrote: > > > > > >> > > > On Tue 05 Oct 16:04 PDT 2021, khs...@codeaurora.org wrote: > > > > > >> > > > > > > > > >> > > > > On 2021-10-05 15:36, Stephen Boyd wrote: > > > > > >> > > > > > Quoting Bjorn Andersson (2021-10-05 14:40:38) > > > > > >> > > > > > > On Tue 05 Oct 11:45 PDT 2021, Stephen Boyd wrote: > > > > > >> > > > > > > > > > > > >> > > > > > > > Quoting Bjorn Andersson (2021-10-04 19:37:50) > > > > > >> > > > > > > > > Found in the middle of a patch from Sankeerth was > > > > > >> > > > > > > > > the reduction of the > > > > > >> > > > > > > > > INIT_SETUP timeout from 10s to 100ms. Upon > > > > > >> > > > > > > > > INIT_SETUP timeout the host > > > > > >> > > > > > > > > is initalized and HPD interrupt start to be > > > > > >> > > > > > > > > serviced, so in the case of > > > > > >> > > > > > > > > eDP this reduction improves the user experience > > > > > >> > > > > > > > > dramatically - i.e. > > > > > >> > > > > > > > > removes 9.9s of bland screen time at boot. > > > > > >> > > > > > > > > > > > > > >> > > > > > > > > Suggested-by: Sankeerth Billakanti > > > > > >> > > > > > > > > <sbill...@codeaurora.org> > > > > > >> > > > > > > > > Signed-off-by: Bjorn Andersson > > > > > >> > > > > > > > > <bjorn.anders...@linaro.org> > > > > > >> > > > > > > > > --- > > > > > >> > > > > > > > > > > > > >> > > > > > > > Any Fixes tag? BTW, the delay design is pretty > > > > > >> > > > > > > > convoluted. I had to go > > > > > >> > > > > > > > re-read the code a couple times to understand that > > > > > >> > > > > > > > it's waiting 100ms > > > > > >> > > > > > > > times the 'delay' number. Whaaaaat? > > > > > >> > > > > > > > > > > > > >> > > > > > > > > > > > >> > > > > > > I assume you're happy with the current 10s delay on > > > > > >> > > > > > > the current > > > > > >> > > > > > > devices, so I don't think we should push for this to > > > > > >> > > > > > > be backported. > > > > > >> > > > > > > I have no need for it to be backported on my side at > > > > > >> > > > > > > least. > > > > > >> > > > > > > > > > > > >> > > > > > > > > > > >> > > > > > Sure. Fixes tag != backported to stable trees but it is > > > > > >> > > > > > close. > > > > > >> > > > > > > > > > > >> > > > > > > > Reviewed-by: Stephen Boyd <swb...@chromium.org> > > > > > >> > > > > > > > > > > > >> > > > > dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 1); <== to 100ms > > > > > >> > > > > > > > > > >> > > > > This patch will prevent usb3 from working due to dp driver > > > > > >> > > > > initialize phy > > > > > >> > > > > earlier than usb3 which cause timeout error at power up > > > > > >> > > > > usb3 phy > > > > > >> > > > > when both > > > > > >> > > > > edp and dp are enabled. > > > > > >> > > > > > > > > >> > > > Can you please help me understand what you mean here, I use > > > > > >> > > > this on my > > > > > >> > > > sc8180x with both eDP and USB-C/DP right now. What is it > > > > > >> > > > that doesn't > > > > > >> > > > work? Or am I just lucky in some race condition? > > > > > >> > > > > > > > > >> > > > Thanks, > > > > > >> > > > Bjorn > > > > > >> > > > > > > > > >> > > The problem is seen at sc7280. > > > > > >> > > Apple dongle have both hdmi and usb port. > > > > > >> > > plug Apple dongle into type-c, then plug DP into apple's hdmi > > > > > >> > > port > > > > > >> > > and usb > > > > > >> > > mouse into apple's usb port. > > > > > >> > > If edp enabled at this time, then usb mouse will not work due > > > > > >> > > to > > > > > >> > > timeout at > > > > > >> > > phy power up. > > > > > >> > > > > > > > >> > > > > > > >> > Okay, so you're saying that if the DP driver invokes > > > > > >> > phy_power_on() > > > > > >> > before the USB driver does, USB initialization fails (or at > > > > > >> > least USB > > > > > >> > doesn't work)? > > > > > >> > > > > > >> if dp driver call qcom_qmp_phy_init() before usb3 call > > > > > >> qcom_qmp_phy_init(), > > > > > >> usb3 driver will timeout at readl_poll_timeout(status, val, (val & > > > > > >> mask) == > > > > > >> ready, 10, PHY_INIT_COMPLETE_TIMEOUT) of qcom_qmp_phy_power_on(). > > > > > > > > > > > > Thanks, I will try to reproduce this on my side. So the 10 seconds > > > > > > here > > > > > > is strictly to give good enough time for the dwc3 driver to probe... > > > > > > > > > > > > Any idea why you're saying that this is specific to sc7280, what > > > > > > changed > > > > > > from sc7180? > > > > > > > > > > I did not have sc7180 with edp before so that i am not sure it will > > > > > happen on sc7180 or not. > > > > > The usb3 does not work when both edp and dp enabled I just seen at > > > > > sc7280. > > > > > Current at sc7280 EC is not boot up correctly when system power up. > > > > > I have to manual reboot EC from linux kernel shell before DP/usb3 can > > > > > work. > > > > > I am not sure this contribute to this problem or not. > > > > > > > > > > > > > Can you make the usb driver into a module and only load that module > > > > later in boot after the DP driver calls qcom_qmp_phy_init()? That would > > > > be an easy way to move usb probe after DP probe and expose this problem. > > > > > > we need usb calls qcom_qmp_phy_init() before dp. > > > > Why? > I do not know the details. > But I did see below scenario, > > if dp driver call qcom_qmp_phy_init() before usb3 call > qcom_qmp_phy_init(), > usb3 driver will timeout at readl_poll_timeout(status, val, (val & > mask) == > ready, 10, PHY_INIT_COMPLETE_TIMEOUT) of qcom_qmp_phy_power_on().
Sounds like a bug in the QMP driver, something that could easily be reproduced by waiting for DP to be up before we bring up USB - either by chance, or following Stephen's suggestion on purpose. Someone will have to look into this, so that we don't need a 10 second workaround in the (e)DP driver. Regards, Bjorn
