+linux-arm-msm@vger.kernel.org
Hi Roger,
On 10/11/2024, 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://lore.kernel.org/all/1519dbe7-73b6-4afc-bfe3-23f4f75d772f@kernel.org/ Signed-off-by: Roger Quadros rogerq@kernel.org Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com
Changes in v3:
- Fix single line comment style
- add DWC3_GUSB3PIPECTL_SUSPHY to documentation of susphy_state
- Added Acked-by tag
- Link to v2: https://lore.kernel.org/r/20241009-am62-lpm-usb-v2-1-da26c0cd2b1e@kernel.org
Changes in v2:
- Fix comment style
- Use both USB3 and USB2 SUSPHY bits to determine susphy_state during system suspend/resume.
- Restore SUSPHY bits at system resume regardless if it was set or cleared before system suspend.
- Link to v1: https://lore.kernel.org/r/20241001-am62-lpm-usb-v1-1-9916b71165f7@kernel.org
drivers/usb/dwc3/core.c | 19 +++++++++++++++++++ drivers/usb/dwc3/core.h | 3 +++ 2 files changed, 22 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 9eb085f359ce..ca77f0b186c4 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2336,6 +2336,11 @@ 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) ||(dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)) &DWC3_GUSB3PIPECTL_SUSPHY);
I'm running into an issue on my Pixel 6 device with this change when the dwc3-exynos device has runtime PM enabled. Basically, after the device boots up and I disconnect USB, the dwc3-exynos device enters runtime suspend followed by system suspend 15 seconds later. On system suspend, the clocks powering these dwc3 registers are off which results in an SError. I have verified that reverting this change fixes the issue.
I noticed that dwc3-qcom.c also supports runtime PM for their dwc3 device and most likely is affected by this as well. It would be great if someone with a Qualcomm device could test out dwc3 suspend as well.
Here is the crash stack:
SError Interrupt on CPU7, code 0x00000000be000011 -- SError CPU: 7 UID: 1000 PID: 5661 Comm: binder:477_1 Tainted: G W OE 6.12.0-rc3-android16-0-maybe-dirty-4k #1 0439eacb3cff642033630df7ee2e250e0625f2f0 96 irq, BUS_DATA0 group, 0x0 Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Raven DVT (DT) pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : readl+0x40/0x80 lr : readl+0x38/0x80 sp : ffffffc08baa39a0 x29: ffffffc08baa39a0 x28: ffffffd4dd140000 x27: ffffffd4dd140d70 x26: ffffffd4dd2b2000 x25: ffffff800cef2410 x24: ffffff800cef24c0 x23: ffffffd4dd24e000 x22: ffffff887df59440 x21: ffffffc085298100 x20: ffffffd4db8acf60 x19: ffffffc085298200 x18: ffffffc091b730b0 x17: 000000002a703c0b x16: 000000002a703c0b x15: 0000000000953000 x14: 0000000000000000 x13: 0000000000000030 x12: 0101010101010101 x11: 7f7f7f7f7f7fffff x10: 0000000000000000 x9 : ffffffd4dc0d7d48 x8 : 0000000000000000 x7 : 0000000000008000 x6 : 0000000000000000 x5 : 500020737562ffff x4 : 500020737562ffff x3 : ffffffd4db8acf60 x2 : ffffffd4db8a7bac x1 : ffffffc085298200 x0 : 0000000000000020 Kernel panic - not syncing: Asynchronous SError Interrupt CPU: 7 UID: 1000 PID: 5661 Comm: binder:477_1 Tainted: G W OE 6.12.0-rc3-android16-0-maybe-dirty-4k #1 0439eacb3cff642033630df7ee2e250e0625f2f0 Tainted: [W]=WARN, [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Raven DVT (DT) Call trace: dump_backtrace+0xec/0x128 show_stack+0x18/0x28 dump_stack_lvl+0x40/0x88 dump_stack+0x18/0x24 panic+0x134/0x45c nmi_panic+0x3c/0x88 arm64_serror_panic+0x64/0x8c do_serror+0xc4/0xc8 el1h_64_error_handler+0x34/0x48 el1h_64_error+0x68/0x6c readl+0x40/0x80 dwc3_suspend_common+0x34/0x454 dwc3_suspend+0x20/0x40 platform_pm_suspend+0x40/0x90 dpm_run_callback+0x60/0x250 device_suspend+0x334/0x614 dpm_suspend+0xc4/0x368 dpm_suspend_start+0x90/0x100 suspend_devices_and_enter+0x128/0xad0 pm_suspend+0x354/0x650 state_store+0x104/0x144 kobj_attr_store+0x30/0x48 sysfs_kf_write+0x54/0x6c kernfs_fop_write_iter+0x104/0x1e4 vfs_write+0x3bc/0x50c ksys_write+0x78/0xe8 __arm64_sys_write+0x1c/0x2c invoke_syscall+0x58/0x10c el0_svc_common+0xa8/0xdc do_el0_svc+0x1c/0x28 el0_svc+0x38/0x6c el0t_64_sync_handler+0x70/0xbc el0t_64_sync+0x1a8/0x1ac
Thanks, Will
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