* Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx> [150319 10:50]:
> On 03/19/2015 04:30 PM, Sergei Shtylyov wrote:
> >>--- a/drivers/usb/musb/musb_dsps.c
> >>+++ b/drivers/usb/musb/musb_dsps.c
> >>@@ -655,6 +655,36 @@ static int dsps_musb_reset(struct musb *musb)
> >> return !session_restart;
> >> }
> >>
> >>+/* Similar to am35x, dm81xx support only 32-bit read operation */
> >>+static void dsps_read_fifo32(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
> >>+{
> >>+ void __iomem *fifo = hw_ep->fifo;
> >>+ u32 val;
> >>+ int i;
> >>+
> >>+ /* Read for 32bit-aligned destination address */
> >>+ if (likely((0x03 & (unsigned long)dst) == 0) && len >= 4) {
> >>+ readsl(fifo, dst, len >> 2);
> >>+ dst += len & ~0x03;
> >>+ len &= 0x03;
> >>+ }
> >>+ /*
> >>+ * Now read the remaining 1 to 3 byte or complete length if
> >>+ * unaligned address.
> >>+ */
>
> > This comment seems misplaced, it belongs before the next *if*.
>
> >>+ if (len > 4) {
> >>+ for (i = 0; i < (len >> 2); i++) {
> >>+ *(u32 *)dst = musb_readl(fifo, 0);
> >>+ dst += 4;
> >>+ }
>
> > Not sure how this is different to using readsl().
>
> Ah, the default implementation of musb_readl() uses __raw_readl().
> So you'd probably want to keep this loop, not readsl() call.
Not sure I follow you here.. Also include/asm-generic/io.h readsl()
uses __raw_readl()?
It seems things work with what I posted, so a readsl() loop, then
just read the remaining 1 to 3 bytes.
Regards,
Tony
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