| Message ID | 1594351856-876-1-git-send-email-chunfeng.yun@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | usb: gadget: bdc: use readl_poll_timeout() to simplify code | expand |
Quoting Chunfeng Yun (2020-07-09 20:30:56) > diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c > index 02a3a77..fa173de 100644 > --- a/drivers/usb/gadget/udc/bdc/bdc_core.c > +++ b/drivers/usb/gadget/udc/bdc/bdc_core.c > @@ -32,21 +33,14 @@ > static int poll_oip(struct bdc *bdc, int usec) Can we change usec to unsigned? Not sure why negative time is important. > { > u32 status; > - /* Poll till STS!= OIP */ > - while (usec) { > - status = bdc_readl(bdc->regs, BDC_BDCSC); > - if (BDC_CSTS(status) != BDC_OIP) { > - dev_dbg(bdc->dev, > - "poll_oip complete status=%d", > - BDC_CSTS(status)); This debug message was lost in the conversion. Any reason? > - return 0; > - } > - udelay(10); > - usec -= 10; > - } > - dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status); > + int ret; > > - return -ETIMEDOUT; > + ret = readl_poll_timeout(bdc->regs + BDC_BDCSC, status, > + (BDC_CSTS(status) != BDC_OIP), 10, usec); > + if (ret) > + dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status); Please drop "Err:" as we have kernel log levels (i.e. dev_err() used here) for that. > + > + return ret; > }
On Fri, 2020-07-10 at 16:37 -0700, Stephen Boyd wrote: > Quoting Chunfeng Yun (2020-07-09 20:30:56) > > diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c > > index 02a3a77..fa173de 100644 > > --- a/drivers/usb/gadget/udc/bdc/bdc_core.c > > +++ b/drivers/usb/gadget/udc/bdc/bdc_core.c > > @@ -32,21 +33,14 @@ > > static int poll_oip(struct bdc *bdc, int usec) > > Can we change usec to unsigned? Not sure why negative time is important. Yes, it's sensible to use unsigned. > > > { > > u32 status; > > - /* Poll till STS!= OIP */ > > - while (usec) { > > - status = bdc_readl(bdc->regs, BDC_BDCSC); > > - if (BDC_CSTS(status) != BDC_OIP) { > > - dev_dbg(bdc->dev, > > - "poll_oip complete status=%d", > > - BDC_CSTS(status)); > > This debug message was lost in the conversion. Any reason? No, will add it back > > > - return 0; > > - } > > - udelay(10); > > - usec -= 10; > > - } > > - dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status); > > + int ret; > > > > - return -ETIMEDOUT; > > + ret = readl_poll_timeout(bdc->regs + BDC_BDCSC, status, > > + (BDC_CSTS(status) != BDC_OIP), 10, usec); > > + if (ret) > > + dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status); > > Please drop "Err:" as we have kernel log levels (i.e. dev_err() used > here) for that. Ok Thanks > > > + > > + return ret; > > }
diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c index 02a3a77..fa173de 100644 --- a/drivers/usb/gadget/udc/bdc/bdc_core.c +++ b/drivers/usb/gadget/udc/bdc/bdc_core.c @@ -12,6 +12,7 @@ #include <linux/spinlock.h> #include <linux/platform_device.h> #include <linux/interrupt.h> +#include <linux/iopoll.h> #include <linux/ioport.h> #include <linux/io.h> #include <linux/list.h> @@ -32,21 +33,14 @@ static int poll_oip(struct bdc *bdc, int usec) { u32 status; - /* Poll till STS!= OIP */ - while (usec) { - status = bdc_readl(bdc->regs, BDC_BDCSC); - if (BDC_CSTS(status) != BDC_OIP) { - dev_dbg(bdc->dev, - "poll_oip complete status=%d", - BDC_CSTS(status)); - return 0; - } - udelay(10); - usec -= 10; - } - dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status); + int ret; - return -ETIMEDOUT; + ret = readl_poll_timeout(bdc->regs + BDC_BDCSC, status, + (BDC_CSTS(status) != BDC_OIP), 10, usec); + if (ret) + dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status); + + return ret; } /* Stop the BDC controller */
Use readl_poll_timeout() to poll register status Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> --- drivers/usb/gadget/udc/bdc/bdc_core.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-)