5.15-stable review patch. If anyone has any objections, please let me know.
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From: Roger Quadros rogerq@kernel.org
[ 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@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 Tested-by: Markus Schneider-Pargmann msp@baylibre.com Reviewed-by: Dhruva Gole d-gole@ti.com Link: https://lore.kernel.org/r/20241011-am62-lpm-usb-v3-1-562d445625b5@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@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 6c740dc633e7c..0ca06a3ab7179 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1796,6 +1796,11 @@ 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)) @@ -1843,6 +1848,15 @@ 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; }
@@ -1905,6 +1919,11 @@ 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 7e7820ce21bf5..3d434c110bdb6 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1085,6 +1085,8 @@ struct dwc3_scratchpad_array { * @dis_metastability_quirk: set to disable metastability quirk. * @dis_split_quirk: set to disable split boundary. * @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. @@ -1300,6 +1302,7 @@ struct dwc3 { unsigned dis_split_quirk:1; unsigned async_callbacks:1; unsigned suspended:1; + unsigned susphy_state:1;
u16 imod_interval;