This adjusts (micro)frame length to appropriate value thus avoiding USB devices to time out over a longer run
Signed-off-by: Nikhil Badola nikhil.badola@freescale.com --- drivers/usb/host/xhci-dwc3.c | 6 ++++++ drivers/usb/host/xhci-fsl.c | 3 +++ include/linux/usb/dwc3.h | 22 ++++++++++++++++------ 3 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c index 67147cb..c722c50 100644 --- a/drivers/usb/host/xhci-dwc3.c +++ b/drivers/usb/host/xhci-dwc3.c @@ -89,3 +89,9 @@ int dwc3_core_init(struct dwc3 *dwc3_reg)
return 0; } + +void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val) +{ + setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL | + GFLADJ_30MHZ(val)); +} diff --git a/drivers/usb/host/xhci-fsl.c b/drivers/usb/host/xhci-fsl.c index 385422a..6781b94 100644 --- a/drivers/usb/host/xhci-fsl.c +++ b/drivers/usb/host/xhci-fsl.c @@ -58,6 +58,9 @@ static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci) /* We are hard-coding DWC3 core to Host Mode */ dwc3_set_mode(fsl_xhci->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
+ /* Set GFLADJ_30MHZ as 20h as per XHCI spec default value */ + dwc3_set_fladj(fsl_xhci->dwc3_reg, GFLADJ_30MHZ_DEFAULT); + return ret; }
diff --git a/include/linux/usb/dwc3.h b/include/linux/usb/dwc3.h index ba7f314..dd934a0 100644 --- a/include/linux/usb/dwc3.h +++ b/include/linux/usb/dwc3.h @@ -109,7 +109,11 @@ struct dwc3 { /* offset: 0xC100 */
u32 g_hwparams8;
- u32 reserved4[63]; + u32 reserved4[11]; + + u32 g_fladj; + + u32 reserved5[51];
u32 d_cfg; u32 d_ctl; @@ -118,15 +122,15 @@ struct dwc3 { /* offset: 0xC100 */ u32 d_gcmdpar; u32 d_gcmd;
- u32 reserved5[2]; + u32 reserved6[2];
u32 d_alepena;
- u32 reserved6[55]; + u32 reserved7[55];
struct d_physical_endpoint d_phy_ep_cmd[32];
- u32 reserved7[128]; + u32 reserved8[128];
u32 o_cfg; u32 o_ctl; @@ -134,7 +138,7 @@ struct dwc3 { /* offset: 0xC100 */ u32 o_evten; u32 o_sts;
- u32 reserved8[3]; + u32 reserved9[3];
u32 adp_cfg; u32 adp_ctl; @@ -143,7 +147,7 @@ struct dwc3 { /* offset: 0xC100 */
u32 bc_cfg;
- u32 reserved9; + u32 reserved10;
u32 bc_evt; u32 bc_evten; @@ -191,10 +195,16 @@ struct dwc3 { /* offset: 0xC100 */ #define DWC3_DCTL_CSFTRST (1 << 30) #define DWC3_DCTL_LSFTRST (1 << 29)
+/* Global Frame Length Adjustment Register */ +#define GFLADJ_30MHZ_REG_SEL (1 << 7) +#define GFLADJ_30MHZ(n) ((n) & 0x3f) +#define GFLADJ_30MHZ_DEFAULT 0x20 + #ifdef CONFIG_USB_XHCI_DWC3 void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode); void dwc3_core_soft_reset(struct dwc3 *dwc3_reg); int dwc3_core_init(struct dwc3 *dwc3_reg); void usb_phy_reset(struct dwc3 *dwc3_reg); +void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val); #endif #endif /* __DWC3_H_ */