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serial: imx-serial - update RX error counters when DMA is used

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Update error counters when DMA is used for receiving data. Do
this by using DMA transaction error event instead error interrupts
to reduce interrupt load.

Tested-by: Peter Senna Tschudin <peter.senna@collabora.com>
Acked-by: Peter Senna Tschudin <peter.senna@collabora.com>
Signed-off-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nandor Han 2016-08-08 15:38:28 +03:00 committed by Greg Kroah-Hartman
parent 9d297239b8
commit 41d98b5da9
1 changed files with 32 additions and 0 deletions
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32
drivers/tty/serial/imx.c
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@ -704,6 +704,7 @@ out:
return IRQ_HANDLED;
}
static void clear_rx_errors(struct imx_port *sport);
static int start_rx_dma(struct imx_port *sport);
/*
* If the RXFIFO is filled with some data, and then we
@ -729,6 +730,11 @@ static void imx_dma_rxint(struct imx_port *sport)
temp &= ~(UCR2_ATEN);
writel(temp, sport->port.membase + UCR2);
/* disable the rx errors interrupts */
temp = readl(sport->port.membase + UCR4);
temp &= ~UCR4_OREN;
writel(temp, sport->port.membase + UCR4);
/* tell the DMA to receive the data. */
start_rx_dma(sport);
}
@ -961,6 +967,7 @@ static void dma_rx_callback(void *data)
if (status == DMA_ERROR) {
dev_err(sport->port.dev, "DMA transaction error.\n");
clear_rx_errors(sport);
return;
}
@ -1057,6 +1064,31 @@ static int start_rx_dma(struct imx_port *sport)
return 0;
}
static void clear_rx_errors(struct imx_port *sport)
{
unsigned int status_usr1, status_usr2;
status_usr1 = readl(sport->port.membase + USR1);
status_usr2 = readl(sport->port.membase + USR2);
if (status_usr2 & USR2_BRCD) {
sport->port.icount.brk++;
writel(USR2_BRCD, sport->port.membase + USR2);
} else if (status_usr1 & USR1_FRAMERR) {
sport->port.icount.frame++;
writel(USR1_FRAMERR, sport->port.membase + USR1);
} else if (status_usr1 & USR1_PARITYERR) {
sport->port.icount.parity++;
writel(USR1_PARITYERR, sport->port.membase + USR1);
}
if (status_usr2 & USR2_ORE) {
sport->port.icount.overrun++;
writel(USR2_ORE, sport->port.membase + USR2);
}
}
#define TXTL_DEFAULT 2 /* reset default */
#define RXTL_DEFAULT 1 /* reset default */
#define TXTL_DMA 8 /* DMA burst setting */