The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From f88359e1588b85cf0e8209ab7d6620085f3441d9 Mon Sep 17 00:00:00 2001 From: Yu Chen <chenyu56@xxxxxxxxxx> Date: Thu, 15 Apr 2021 15:20:30 -0700 Subject: [PATCH] usb: dwc3: core: Do core softreset when switch mode From: John Stultz <john.stultz@xxxxxxxxxx> According to the programming guide, to switch mode for DRD controller, the driver needs to do the following. To switch from device to host: 1. Reset controller with GCTL.CoreSoftReset 2. Set GCTL.PrtCapDir(host mode) 3. Reset the host with USBCMD.HCRESET 4. Then follow up with the initializing host registers sequence To switch from host to device: 1. Reset controller with GCTL.CoreSoftReset 2. Set GCTL.PrtCapDir(device mode) 3. Reset the device with DCTL.CSftRst 4. Then follow up with the initializing registers sequence Currently we're missing step 1) to do GCTL.CoreSoftReset and step 3) of switching from host to device. John Stult reported a lockup issue seen with HiKey960 platform without these steps[1]. Similar issue is observed with Ferry's testing platform[2]. So, apply the required steps along with some fixes to Yu Chen's and John Stultz's version. The main fixes to their versions are the missing wait for clocks synchronization before clearing GCTL.CoreSoftReset and only apply DCTL.CSftRst when switching from host to device. [1] https://lore.kernel.org/linux-usb/20210108015115.27920-1-john.stultz@xxxxxxxxxx/ [2] https://lore.kernel.org/linux-usb/0ba7a6ba-e6a7-9cd4-0695-64fc927e01f1@xxxxxxxxx/ Fixes: 41ce1456e1db ("usb: dwc3: core: make dwc3_set_mode() work properly") Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Cc: Ferry Toth <fntoth@xxxxxxxxx> Cc: Wesley Cheng <wcheng@xxxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Tested-by: John Stultz <john.stultz@xxxxxxxxxx> Tested-by: Wesley Cheng <wcheng@xxxxxxxxxxxxxx> Signed-off-by: Yu Chen <chenyu56@xxxxxxxxxx> Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx> Signed-off-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/374440f8dcd4f06c02c2caf4b1efde86774e02d9.1618521663.git.Thinh.Nguyen@xxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 5c25e6a72dbd..2f118ad43571 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -114,6 +114,8 @@ void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode) dwc->current_dr_role = mode; } +static int dwc3_core_soft_reset(struct dwc3 *dwc); + static void __dwc3_set_mode(struct work_struct *work) { struct dwc3 *dwc = work_to_dwc(work); @@ -121,6 +123,8 @@ static void __dwc3_set_mode(struct work_struct *work) int ret; u32 reg; + mutex_lock(&dwc->mutex); + pm_runtime_get_sync(dwc->dev); if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_OTG) @@ -154,6 +158,25 @@ static void __dwc3_set_mode(struct work_struct *work) break; } + /* For DRD host or device mode only */ + if (dwc->desired_dr_role != DWC3_GCTL_PRTCAP_OTG) { + reg = dwc3_readl(dwc->regs, DWC3_GCTL); + reg |= DWC3_GCTL_CORESOFTRESET; + dwc3_writel(dwc->regs, DWC3_GCTL, reg); + + /* + * Wait for internal clocks to synchronized. DWC_usb31 and + * DWC_usb32 may need at least 50ms (less for DWC_usb3). To + * keep it consistent across different IPs, let's wait up to + * 100ms before clearing GCTL.CORESOFTRESET. + */ + msleep(100); + + reg = dwc3_readl(dwc->regs, DWC3_GCTL); + reg &= ~DWC3_GCTL_CORESOFTRESET; + dwc3_writel(dwc->regs, DWC3_GCTL, reg); + } + spin_lock_irqsave(&dwc->lock, flags); dwc3_set_prtcap(dwc, dwc->desired_dr_role); @@ -178,6 +201,8 @@ static void __dwc3_set_mode(struct work_struct *work) } break; case DWC3_GCTL_PRTCAP_DEVICE: + dwc3_core_soft_reset(dwc); + dwc3_event_buffers_setup(dwc); if (dwc->usb2_phy) @@ -200,6 +225,7 @@ static void __dwc3_set_mode(struct work_struct *work) out: pm_runtime_mark_last_busy(dwc->dev); pm_runtime_put_autosuspend(dwc->dev); + mutex_unlock(&dwc->mutex); } void dwc3_set_mode(struct dwc3 *dwc, u32 mode) @@ -1553,6 +1579,7 @@ static int dwc3_probe(struct platform_device *pdev) dwc3_cache_hwparams(dwc); spin_lock_init(&dwc->lock); + mutex_init(&dwc->mutex); pm_runtime_set_active(dev); pm_runtime_use_autosuspend(dev); diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 695ff2d791e4..7e3afa5378e8 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -13,6 +13,7 @@ #include <linux/device.h> #include <linux/spinlock.h> +#include <linux/mutex.h> #include <linux/ioport.h> #include <linux/list.h> #include <linux/bitops.h> @@ -947,6 +948,7 @@ struct dwc3_scratchpad_array { * @scratch_addr: dma address of scratchbuf * @ep0_in_setup: one control transfer is completed and enter setup phase * @lock: for synchronizing + * @mutex: for mode switching * @dev: pointer to our struct device * @sysdev: pointer to the DMA-capable device * @xhci: pointer to our xHCI child @@ -1088,6 +1090,9 @@ struct dwc3 { /* device lock */ spinlock_t lock; + /* mode switching lock */ + struct mutex mutex; + struct device *dev; struct device *sysdev;