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serial: sh-sci: Switch to generic DMA residue handling 

Convert the SCI driver from the SHDMAE-specific partial DMA transfer
handling to the generic dmaengine residual data framework.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2015-08-21 20:02:45 +02:00 committed by Greg Kroah-Hartman
parent 3e14670c06
commit 565dd11aa7
2 changed files with 10 additions and 8 deletions
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2
drivers/tty/serial/Kconfig
View File

@ -743,7 +743,7 @@ config SERIAL_SH_SCI_CONSOLE
config SERIAL_SH_SCI_DMA
bool "DMA support"
depends on SERIAL_SH_SCI && SH_DMAE
depends on SERIAL_SH_SCI && DMA_ENGINE
config SERIAL_PNX8XXX
bool "Enable PNX8XXX SoCs' UART Support"

16
drivers/tty/serial/sh-sci.c
View File

@ -1438,6 +1438,8 @@ static void work_fn_rx(struct work_struct *work)
struct sci_port *s = container_of(work, struct sci_port, work_rx);
struct uart_port *port = &s->port;
struct dma_async_tx_descriptor *desc;
struct dma_tx_state state;
enum dma_status status;
int new;
if (s->active_rx == s->cookie_rx[0]) {
@ -1451,21 +1453,21 @@ static void work_fn_rx(struct work_struct *work)
}
desc = s->desc_rx[new];
if (dma_async_is_tx_complete(s->chan_rx, s->active_rx, NULL, NULL) !=
DMA_COMPLETE) {
status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state);
if (status != DMA_COMPLETE) {
/* Handle incomplete DMA receive */
struct dma_chan *chan = s->chan_rx;
struct shdma_desc *sh_desc = container_of(desc,
struct shdma_desc, async_tx);
unsigned long flags;
unsigned int read;
int count;
dmaengine_terminate_all(chan);
dev_dbg(port->dev, "Read %zu bytes with cookie %d\n",
sh_desc->partial, sh_desc->cookie);
read = sg_dma_len(&s->sg_rx[new]) - state.residue;
dev_dbg(port->dev, "Read %u bytes with cookie %d\n", read,
s->active_rx);
spin_lock_irqsave(&port->lock, flags);
count = sci_dma_rx_push(s, sh_desc->partial);
count = sci_dma_rx_push(s, read);
spin_unlock_irqrestore(&port->lock, flags);
if (count)