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serial: imx: Do not store/restore the UBRC register 

UBRC is a read-only register, so we should not store and restore it inside
imx_flush_buffer().

Reported-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fabio Estevam 2015-02-07 15:46:41 -02:00 committed by Greg Kroah-Hartman
parent 16420ad05c
commit 4f86a95d75
1 changed files with 1 additions and 3 deletions
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4
drivers/tty/serial/imx.c
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@ -1320,7 +1320,7 @@ static void imx_flush_buffer(struct uart_port *port)
struct imx_port *sport = (struct imx_port *)port;
struct scatterlist *sgl = &sport->tx_sgl[0];
unsigned long temp;
int i = 100, ubir, ubmr, ubrc, uts;
int i = 100, ubir, ubmr, uts;
if (!sport->dma_chan_tx)
return;
@ -1345,7 +1345,6 @@ static void imx_flush_buffer(struct uart_port *port)
*/
ubir = readl(sport->port.membase + UBIR);
ubmr = readl(sport->port.membase + UBMR);
ubrc = readl(sport->port.membase + UBRC);
uts = readl(sport->port.membase + IMX21_UTS);
temp = readl(sport->port.membase + UCR2);
@ -1358,7 +1357,6 @@ static void imx_flush_buffer(struct uart_port *port)
/* Restore the registers */
writel(ubir, sport->port.membase + UBIR);
writel(ubmr, sport->port.membase + UBMR);
writel(ubrc, sport->port.membase + UBRC);
writel(uts, sport->port.membase + IMX21_UTS);
}