| Message ID | 20241001-am62-lpm-usb-v1-1-9916b71165f7@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | usb: dwc3: core: Fix system suspend on TI AM62 platforms | expand |
Hi, On Tue, Oct 01, 2024, Roger Quadros wrote: > Since commit 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init"), > system suspend is broken on AM62 TI platforms. > > Before that commit, both DWC3_GUSB3PIPECTL_SUSPHY and DWC3_GUSB2PHYCFG_SUSPHY > bits (hence forth called 2 SUSPHY bits) were being set during core > initialization and even during core re-initialization after a system > suspend/resume. > > These bits are required to be set for system suspend/resume to work correctly > on AM62 platforms. > > Since that commit, the 2 SUSPHY bits are not set for DEVICE/OTG mode if gadget > driver is not loaded and started. > For Host mode, the 2 SUSPHY bits are set before the first system suspend but > get cleared at system resume during core re-init and are never set again. > > This patch resovles these two issues by ensuring the 2 SUSPHY bits are set > before system suspend and restored to the original state during system resume. > > Cc: stable@vger.kernel.org # v6.9+ > Fixes: 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init") > Link: https://urldefense.com/v3/__https://lore.kernel.org/all/1519dbe7-73b6-4afc-bfe3-23f4f75d772f@kernel.org/__;!!A4F2R9G_pg!ahChm4MaKd6VGYqbnM4X1_pY_jqavYDv5HvPFbmicKuhvFsBwlEFi1xO5itGuHmfjbRuUSzReJISf5-1gXpr$ > Signed-off-by: Roger Quadros <rogerq@kernel.org> > --- > drivers/usb/dwc3/core.c | 16 ++++++++++++++++ > drivers/usb/dwc3/core.h | 2 ++ > 2 files changed, 18 insertions(+) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index 9eb085f359ce..1233922d4d54 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -2336,6 +2336,9 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > u32 reg; > int i; > > + dwc->susphy_state = !!(dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)) & > + DWC3_GUSB2PHYCFG_SUSPHY); > + > switch (dwc->current_dr_role) { > case DWC3_GCTL_PRTCAP_DEVICE: > if (pm_runtime_suspended(dwc->dev)) > @@ -2387,6 +2390,11 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > break; > } > > + if (!PMSG_IS_AUTO(msg)) { > + if (!dwc->susphy_state) > + dwc3_enable_susphy(dwc, true); > + } > + > return 0; > } > > @@ -2454,6 +2462,14 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) > break; > } > > + if (!PMSG_IS_AUTO(msg)) { > + /* dwc3_core_init_for_resume() disables SUSPHY so just handle > + * the enable case > + */ Can we note that this is a particular behavior needed for AM62 here? And can we use this comment style: /* * xxxxx * xxxxx */ > + if (dwc->susphy_state) Shouldn't we check for if (!dwc->susphy_state) and clear the susphy bits? > + dwc3_enable_susphy(dwc, true); The dwc3_enable_susphy() set and clear both GUSB3PIPECTL_SUSPHY and GUSB2PHYCFG_SUSPHY, perhaps we should split that function out so we can only need to set for GUSB2PHYCFG_SUSPHY since you only track for that. > + } > + > return 0; > } > > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h > index c71240e8f7c7..b2ed5aba4c72 100644 > --- a/drivers/usb/dwc3/core.h > +++ b/drivers/usb/dwc3/core.h > @@ -1150,6 +1150,7 @@ struct dwc3_scratchpad_array { > * @sys_wakeup: set if the device may do system wakeup. > * @wakeup_configured: set if the device is configured for remote wakeup. > * @suspended: set to track suspend event due to U3/L2. > + * @susphy_state: state of DWC3_GUSB2PHYCFG_SUSPHY before PM suspend. > * @imod_interval: set the interrupt moderation interval in 250ns > * increments or 0 to disable. > * @max_cfg_eps: current max number of IN eps used across all USB configs. > @@ -1382,6 +1383,7 @@ struct dwc3 { > unsigned sys_wakeup:1; > unsigned wakeup_configured:1; > unsigned suspended:1; > + unsigned susphy_state:1; > > u16 imod_interval; > > > --- > base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc > change-id: 20240923-am62-lpm-usb-f420917bd707 > > Best regards, > -- > Roger Quadros <rogerq@kernel.org> > <rant/> While reviewing your change, I see that we misuse the dis_u2_susphy_quirk to make this property a conditional thing during suspend and resume for certain platform. That bugs me because we can't easily change it without the reported hardware to test. </rant> Thanks for the patch! BR, Thinh
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 9eb085f359ce..1233922d4d54 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2336,6 +2336,9 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) u32 reg; int i; + dwc->susphy_state = !!(dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)) & + DWC3_GUSB2PHYCFG_SUSPHY); + switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE: if (pm_runtime_suspended(dwc->dev)) @@ -2387,6 +2390,11 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) break; } + if (!PMSG_IS_AUTO(msg)) { + if (!dwc->susphy_state) + dwc3_enable_susphy(dwc, true); + } + return 0; } @@ -2454,6 +2462,14 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) break; } + if (!PMSG_IS_AUTO(msg)) { + /* dwc3_core_init_for_resume() disables SUSPHY so just handle + * the enable case + */ + if (dwc->susphy_state) + dwc3_enable_susphy(dwc, true); + } + return 0; } diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index c71240e8f7c7..b2ed5aba4c72 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1150,6 +1150,7 @@ struct dwc3_scratchpad_array { * @sys_wakeup: set if the device may do system wakeup. * @wakeup_configured: set if the device is configured for remote wakeup. * @suspended: set to track suspend event due to U3/L2. + * @susphy_state: state of DWC3_GUSB2PHYCFG_SUSPHY before PM suspend. * @imod_interval: set the interrupt moderation interval in 250ns * increments or 0 to disable. * @max_cfg_eps: current max number of IN eps used across all USB configs. @@ -1382,6 +1383,7 @@ struct dwc3 { unsigned sys_wakeup:1; unsigned wakeup_configured:1; unsigned suspended:1; + unsigned susphy_state:1; u16 imod_interval;
Since commit 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init"), system suspend is broken on AM62 TI platforms. Before that commit, both DWC3_GUSB3PIPECTL_SUSPHY and DWC3_GUSB2PHYCFG_SUSPHY bits (hence forth called 2 SUSPHY bits) were being set during core initialization and even during core re-initialization after a system suspend/resume. These bits are required to be set for system suspend/resume to work correctly on AM62 platforms. Since that commit, the 2 SUSPHY bits are not set for DEVICE/OTG mode if gadget driver is not loaded and started. For Host mode, the 2 SUSPHY bits are set before the first system suspend but get cleared at system resume during core re-init and are never set again. This patch resovles these two issues by ensuring the 2 SUSPHY bits are set before system suspend and restored to the original state during system resume. Cc: stable@vger.kernel.org # v6.9+ Fixes: 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init") Link: https://lore.kernel.org/all/1519dbe7-73b6-4afc-bfe3-23f4f75d772f@kernel.org/ Signed-off-by: Roger Quadros <rogerq@kernel.org> --- drivers/usb/dwc3/core.c | 16 ++++++++++++++++ drivers/usb/dwc3/core.h | 2 ++ 2 files changed, 18 insertions(+) --- base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc change-id: 20240923-am62-lpm-usb-f420917bd707 Best regards,