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This patch adds dma_pause operation. This patch is based on
Muhammad Hamza Farooq's patch.
After this patch applied, an issue that the sh-sci driver with
high baud rate might cause data lost disappeared because the DMAC
is possible to transmit between [1] and [2] below, and then
the residue of [1] is not true:
In rx_timer_fn() of the sh-sci.c:
dmaengine_pause();
...
dmaengine_tx_status(); /* [1] */
...
dmaengine_terminate_all(); /* [2] */
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>