> -----Original Message----- > From: Changming Huang [mailto:jerry.huang@xxxxxxx] > Sent: Tuesday, December 13, 2016 5:06 PM > To: balbi@xxxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx > Cc: linux-usb@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Jerry Huang > <jerry.huang@xxxxxxx>; Rajesh Bhagat <rajesh.bhagat@xxxxxxx> > Subject: [PATCH] USB3/DWC3: Enable undefined length INCR burst type > > While enabling undefined length INCR burst type and INCR16 burst type, get > better write performance on NXP Layerscape platform: > around 3% improvement (from 364MB/s to 375MB/s). > > Signed-off-by: Changming Huang <jerry.huang@xxxxxxx> > Signed-off-by: Rajesh Bhagat <rajesh.bhagat@xxxxxxx> > --- > drivers/usb/dwc3/core.c | 6 ++++++ > drivers/usb/dwc3/core.h | 13 +++++++++++++ > 2 files changed, 19 insertions(+) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index > fea4469..0e11891 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -621,6 +621,12 @@ static int dwc3_core_init(struct dwc3 *dwc) > goto err0; > } > > + /* Enable Undefined Length INCR Burst Type and Enable INCR16 > Burst */ > + reg = dwc3_readl(dwc->regs, DWC3_GSBUSCFG0); > + reg &= ~DWC3_GSBUSCFG0_INCRBRSTMASK; > + reg |= DWC3_GSBUSCFG0_INCR16BRSTENA | > DWC3_GSBUSCFG0_INCRBRSTENA; > + dwc3_writel(dwc->regs, DWC3_GSBUSCFG0, reg); > + > /* > * Write Linux Version Code to our GUID register so it's easy to figure > * out which kernel version a bug was found. > diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index > 6b60e42..8bfdb77 100644 > --- a/drivers/usb/dwc3/core.h > +++ b/drivers/usb/dwc3/core.h > @@ -156,6 +156,19 @@ > > /* Bit fields */ > > +/* Global SoC Bus Configuration Register 0 */ > +#define DWC3_GSBUSCFG0_DATABIGEND (1 << 11) > +#define DWC3_GSBUSCFG0_DESCBIGEND (1 << 10) > +#define DWC3_GSBUSCFG0_INCR256BRSTENA (1 << 7) > +#define DWC3_GSBUSCFG0_INCR128BRSTENA (1 << 6) > +#define DWC3_GSBUSCFG0_INCR64BRSTENA (1 << 5) > +#define DWC3_GSBUSCFG0_INCR32BRSTENA (1 << 4) > +#define DWC3_GSBUSCFG0_INCR16BRSTENA (1 << 3) > +#define DWC3_GSBUSCFG0_INCR8BRSTENA (1 << 2) > +#define DWC3_GSBUSCFG0_INCR4BRSTENA (1 << 1) > +#define DWC3_GSBUSCFG0_INCRBRSTENA (1 << 0) > +#define DWC3_GSBUSCFG0_INCRBRSTMASK 0xff > + > /* Global Debug Queue/FIFO Space Available Register */ > #define DWC3_GDBGFIFOSPACE_NUM(n) ((n) & 0x1f) > #define DWC3_GDBGFIFOSPACE_TYPE(n) (((n) << 5) & 0x1e0) > -- I will split this patch to two, one is for the performance tune, the other for macro definition in header file. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
