[PATCH] mtd: nand: pxa3xx: Switch FIFO draining to jiffies-based timeout
maxime.ripard at free-electrons.com
maxime.ripard at free-electrons.com
Wed Mar 4 08:18:55 PST 2015
Hi Baruch,
On Tue, Mar 03, 2015 at 12:18:46PM +0200, Baruch Siach wrote:
> Hi Maxime,
>
> On Tue, Mar 03, 2015 at 10:55:29AM +0100, Maxime Ripard wrote:
> > Now that the driver handles the FIFO draining in a threaded interrupt, we can
> > base our timeout on jiffies and sleeping, instead of using mdelay.
> >
> > Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
> > ---
> > drivers/mtd/nand/pxa3xx_nand.c | 9 ++++-----
> > 1 file changed, 4 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
> > index 3f09f2e9aeb4..1eb957c347cd 100644
> > --- a/drivers/mtd/nand/pxa3xx_nand.c
> > +++ b/drivers/mtd/nand/pxa3xx_nand.c
> > @@ -496,16 +496,15 @@ static void drain_fifo(struct pxa3xx_nand_info *info, void *data, int len)
> > while (len > 8) {
> > __raw_readsl(info->mmio_base + NDDB, data, 8);
> >
> > - for (timeout = 0;
> > - !(nand_readl(info, NDSR) & NDSR_RDDREQ);
> > - timeout++) {
> > - if (timeout >= 5) {
> > + timeout = jiffies + msecs_to_jiffies(5);
> > + while (!(nand_readl(info, NDSR) & NDSR_RDDREQ)) {
> > + if (!time_before(jiffies, timeout)) {
> > dev_err(&info->pdev->dev,
> > "Timeout on RDDREQ while draining the FIFO\n");
> > return;
> > }
> >
> > - mdelay(1);
> > + msleep(1);
> > }
>
> You may want to consider using readl_relaxed_poll_timeout() from
> linux/iopoll.h, which was introduced in v4.0-rc1.
Thanks for pointing this out.
I'll send a new version using this.
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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