Linux Kernels

usb: dwc2: host: add flag to reflect bus state

This change “usb: dwc2: host: add flag to reflect bus state” (commit 734643d) in Linux kernel is authored by Gregory Herrero <gregory.herrero [at] intel.com> on Tue Sep 22 15:16:39 2015 +0200.

Description of "usb: dwc2: host: add flag to reflect bus state"

The change “usb: dwc2: host: add flag to reflect bus state” introduces changes as follows.

usb: dwc2: host: add flag to reflect bus state

lx_state must be used to reflect controller power state only and not
bus state. Thus add a flag to track state during bus suspend.

Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: John Youn <johnyoun@synopsys.com>
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Linux kernel releases containing commit 734643d

The Linux kernel releases containing this commit are as follows.

Linux kernel code changes from "usb: dwc2: host: add flag to reflect bus state"

There are 6 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/usb/dwc2/core.h | 1 +
 drivers/usb/dwc2/hcd.c  | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)
 
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 1a7982dbdad5..d2115d2a3db2 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -764,6 +764,7 @@ struct dwc2_hsotg {
 	u16 frame_usecs[8];
 	u16 frame_number;
 	u16 periodic_qh_count;
+	bool bus_suspended;
 
 #ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
 #define FRAME_NUM_ARRAY_SIZE 1000
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index b929087f26f2..490ecb74382c 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -1425,6 +1425,7 @@ static void dwc2_wakeup_detected(unsigned long data)
 	dev_dbg(hsotg->dev, "Clear Resume: HPRT0=%0x\n",
 		dwc2_readl(hsotg->regs + HPRT0));
 
+	hsotg->bus_suspended = 0;
 	dwc2_hcd_rem_wakeup(hsotg);
 
 	/* Change to L0 state */
@@ -1461,8 +1462,7 @@ static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
 	hprt0 |= HPRT0_SUSP;
 	dwc2_writel(hprt0, hsotg->regs + HPRT0);
 
-	/* Update lx_state */
-	hsotg->lx_state = DWC2_L2;
+	hsotg->bus_suspended = 1;
 
 	/* Suspend the Phy Clock */
 	pcgctl = dwc2_readl(hsotg->regs + PCGCTL);
@@ -1510,6 +1510,7 @@ static void dwc2_port_resume(struct dwc2_hsotg *hsotg)
 	hprt0 = dwc2_read_hprt0(hsotg);
 	hprt0 &= ~(HPRT0_RES | HPRT0_SUSP);
 	dwc2_writel(hprt0, hsotg->regs + HPRT0);
+	hsotg->bus_suspended = 0;
 	spin_unlock_irqrestore(&hsotg->lock, flags);
 }
 

The commit for this change in Linux stable tree is 734643d (patch).

Last modified: 2020/01/11 09:49