Hi William & Chris,
On 02/11/2024 13:50, Roger Quadros wrote:
Hi William,
On 02/11/2024 01:08, William McVicker wrote:
+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.
Chris was facing another issue with this patch on Rockchip RK3566 [1]
Looks like we totally missed the runtime suspended case I'll think about a solution and send something by today.
[1] - https://lore.kernel.org/all/671bef75.050a0220.e4bcd.1821@mx.google.com/
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
Does this patch fix it for you?
From ee8b353523556a29a423261af9c15be261941ff8 Mon Sep 17 00:00:00 2001 From: Roger Quadros rogerq@kernel.org Date: Sat, 2 Nov 2024 14:14:47 +0200 Subject: [PATCH] usb: dwc3: fix fault at system suspend if device was already runtime suspended
If the device was already runtime suspended then during system suspend we cannot access the device registers else it will crash.
Cc: stable@vger.kernel.org # v5.15+ Reported-by: William McVicker willmcvicker@google.com Closes: https://lore.kernel.org/all/ZyVfcUuPq56R2m1Y@google.com Fixes: 705e3ce37bcc ("usb: dwc3: core: Fix system suspend on TI AM62 platforms") Signed-off-by: Roger Quadros rogerq@kernel.org --- drivers/usb/dwc3/core.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 427e5660f87c..4933f1b4d9c6 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -2342,10 +2342,12 @@ 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); + if (!pm_runtime_suspended(dwc->dev)) { + dwc->susphy_state = (dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)) & + DWC3_GUSB2PHYCFG_SUSPHY) || + (dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0)) & + DWC3_GUSB3PIPECTL_SUSPHY); + }
switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE:
base-commit: 4b57d665bce1306a2a887cb760aa0c0e7efb42ab