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FMC DEL 1ns 4cha - Software
Commit 473eead3 authored by Alessandro Rubini's avatar Alessandro Rubini
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kernel/fd-irq: trivial: better calculation and message 

Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent dd1fcc01
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Showing with 6 additions and 4 deletions
kernel/fd-irq.c
View file @ 473eead3
......@@ -72,7 +72,7 @@ int fd_read_sw_fifo(struct fd_dev *fd, struct zio_channel *chan)
/* Copy the sample to local storage */
spin_lock_irqsave(&fd->lock, flags);
i = fd->sw_fifo.tail & (fd_sw_fifo_len - 1);
i = fd->sw_fifo.tail % fd_sw_fifo_len;
t = fd->sw_fifo.t[i];
fd->sw_fifo.tail++;
spin_unlock_irqrestore(&fd->lock, flags);
......@@ -133,7 +133,7 @@ static int fd_read_hw_fifo(struct fd_dev *fd)
return -EAGAIN;
t = fd->sw_fifo.t;
t += fd->sw_fifo.head & (fd_sw_fifo_len - 1);
t += fd->sw_fifo.head % fd_sw_fifo_len;
/* Fetch the fifo entry to registers, so we can read them */
fd_writel(fd, FD_TSBR_ADVANCE_ADV, FD_REG_TSBR_ADVANCE);
......@@ -158,8 +158,10 @@ static int fd_read_hw_fifo(struct fd_dev *fd)
BUG_ON(diff < 0);
if (diff >= fd_sw_fifo_len)
dev_warn(fd->fmc->hwdev, "Fifo overlow, dropped %i samples\n",
fd_sw_fifo_len / 2);
dev_warn(fd->fmc->hwdev, "Fifo overflow: "
" dropped %i samples (%li -> %li == %li)\n",
fd_sw_fifo_len / 2,
fd->sw_fifo.tail, fd->sw_fifo.head, diff);
return 0;
}
......
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