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  1. 09 Dec, 2014 2 commits
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  23. 20 Oct, 2014 2 commits
    • Nicolas Ferre's avatar
      Merge branch 'at91-3.10-trunk/sama5d4_integration+usart' into linux-3.10-at91 · 88185d9f
      Nicolas Ferre authored 
      Conflicts:
	drivers/tty/serial/atmel_serial.c
      88185d9f
    • Cyrille Pitchen's avatar
      tty/serial: at91: fix rx ring buffer management · d5c1c999
      Cyrille Pitchen authored 
      

This patch swaps the use "tail" and "head" to fit the semantic of the linux
circular buffer documentation:
- head: the point at which the producer (the DMA controller) inserts items.
- tail: the point at which the consumer (the serial framework) finds the next
        item.

Besides the former code of the rx ring buffer didn't manage the case where
head < tail, which might lead to loss of data. To fix this bug the data are now
sent from the DMA buffer to the serial framework in two steps:
1 - First, we test if head < tail. If so, we copy the data from tail to the end
    of the DMA buffer then reset tail to zero.
2 - Finally, we copy data from tail to head then set tail to head.

In addition, since tty_insert_flip_string() may now be called twice,
atmel_flip_buffer_rx_dma() becomes less efficient than moving the calls
dma_sync_sg_for_cpu(), dma_sync_sg_for_device(), tty_insert_flip_string() and
tty_flip_buffer_push() directly into atmel_rx_from_dma().
Signed-off-by: default avatarCyrille Pitchen <cyrille.pitchen@atmel.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
      d5c1c999
  25. 17 Oct, 2014 10 commits
  27. 16 Oct, 2014 2 commits