| Message ID | 20221206-dwc2-gadget-dual-role-v2-2-0de821615dd3@theobroma-systems.com |
|---|---|
| State | New |
| Headers | show |
| Series | usb: dwc2: fix USB peripheral role in dual-role mode on PX30 | expand |
Hi Minas, On 12/20/22 07:02, Minas Harutyunyan wrote: > Hi Quentin, > > On 12/16/2022 8:29 PM, Quentin Schulz <foss+kernel@0leil.net> wrote: >> From: Quentin Schulz <foss+kernel@0leil.net> >> Sent: Friday, December 16, 2022 8:29 PM >> To: Minas Harutyunyan <hminas@synopsys.com>; Greg Kroah-Hartman >> <gregkh@linuxfoundation.org> >> Cc: Quentin Schulz <foss+kernel@0leil.net>; linux-usb@vger.kernel.org; >> linux-kernel@vger.kernel.org; Bin Yang <yangbin@rock-chips.com>; Quentin >> Schulz <quentin.schulz@theobroma-systems.com> >> Subject: [PATCH v2 2/2] usb: dwc2: prevent core PHY initialization on >> Rockchip >> >> From: Quentin Schulz <quentin.schulz@theobroma-systems.com> >> >> In Rockchip vendor kernel, the core PHY initialization is disabled with the >> following justification: >> >> The usb phys need to be controlled dynamically on some Rockchip SoCs. >> So set the new HCD flag which prevents USB core from trying to manage our >> phys. >> >> This is required to get USB gadget working in dual-role mode on Ringneck >> PX30 SoM on a Haikou Devkit. >> >> Cc: Bin Yang <yangbin@rock-chips.com> >> Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com> >> --- >> drivers/usb/dwc2/params.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c index >> 9ed9fd956940..9095437b3236 100644 >> --- a/drivers/usb/dwc2/params.c >> +++ b/drivers/usb/dwc2/params.c >> @@ -117,6 +117,7 @@ static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg) >> p->lpm_clock_gating = false; >> p->besl = false; >> p->hird_threshold_en = false; >> + p->hcd_skip_phy_initialization = 1; > > I'm not familiar with all "rk" platforms, but are you sure that > p->hcd_skip_phy_initialization = 1 required for all of them? > No I am not. This is however applied to all devices (even non-Rockchip ones) in Rockchip vendor kernel. I could check on an RK3368 since we have a module available for that, but I don't have access to any other Rockchip platform. From a quick grep, the following seems to be susceptible to this change: rk3128 rv1108 rk3288 rk3036 rk3228-evb rk3229 rk3066a rk3188 rk3328 px30 rk3308 rk3368 Cheers, Quentin
diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c index 9ed9fd956940..9095437b3236 100644 --- a/drivers/usb/dwc2/params.c +++ b/drivers/usb/dwc2/params.c @@ -117,6 +117,7 @@ static void dwc2_set_rk_params(struct dwc2_hsotg *hsotg) p->lpm_clock_gating = false; p->besl = false; p->hird_threshold_en = false; + p->hcd_skip_phy_initialization = 1; } static void dwc2_set_ltq_params(struct dwc2_hsotg *hsotg)