6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Roger Quadros <rogerq@xxxxxxxxxx>
[ Upstream commit 705e3ce37bccdf2ed6f848356ff355f480d51a91 ]
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@xxxxxxxxxxxxxxx # v6.9+
Fixes: 6d735722063a ("usb: dwc3: core: Prevent phy suspend during init")
Link: https://lore.kernel.org/all/1519dbe7-73b6-4afc-bfe3-23f4f75d772f@xxxxxxxxxx/
Signed-off-by: Roger Quadros <rogerq@xxxxxxxxxx>
Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Tested-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
Reviewed-by: Dhruva Gole <d-gole@xxxxxx>
Link: https://lore.kernel.org/r/20241011-am62-lpm-usb-v3-1-562d445625b5@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 af851e4e8c8a7..8cbe19574bbcb 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -2106,6 +2106,11 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
{
u32 reg;
+ 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:
if (pm_runtime_suspended(dwc->dev))
@@ -2153,6 +2158,15 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
break;
}
+ if (!PMSG_IS_AUTO(msg)) {
+ /*
+ * TI AM62 platform requires SUSPHY to be
+ * enabled for system suspend to work.
+ */
+ if (!dwc->susphy_state)
+ dwc3_enable_susphy(dwc, true);
+ }
+
return 0;
}
@@ -2215,6 +2229,11 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
break;
}
+ if (!PMSG_IS_AUTO(msg)) {
+ /* restore SUSPHY state to that before system suspend. */
+ dwc3_enable_susphy(dwc, dwc->susphy_state);
+ }
+
return 0;
}
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 420753205fafa..3325796f3cb45 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1127,6 +1127,8 @@ 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 + DWC3_GUSB3PIPECTL_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.
@@ -1351,6 +1353,7 @@ struct dwc3 {
unsigned sys_wakeup:1;
unsigned wakeup_configured:1;
unsigned suspended:1;
+ unsigned susphy_state:1;
u16 imod_interval;
--
2.43.0
