diff options
| author | Sascha Hauer <sascha@saschahauer.de> | 2008-04-17 09:43:14 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-04-17 17:18:20 +0200 |
| commit | 0d3c3938ff9855d8996db4083efd62e86b8987eb (patch) | |
| tree | 508644741e30c68866fc414b64bb0e0eca51af03 /drivers/serial | |
| parent | [ARM] 4994/1: <IMX UART>: Move error handling into execution path (diff) | |
| download | linux-0d3c3938ff9855d8996db4083efd62e86b8987eb.tar.xz linux-0d3c3938ff9855d8996db4083efd62e86b8987eb.zip | |
[ARM] 4995/1: <IMX UART>: Do not use URXD_CHARRDY for polling
Do not use the URXD_CHARRDY bit for polling for new characters. This works
on i.MX1, but on MX31 the datasheet states that this bit should not be
used for polling. On MX27 it is even worse, here we get a bus error when
we access the read FIFO when no character is present.
Instead, use USR2_RDR (receive data ready) bit.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/imx.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c index c637ae219126..f7596641f121 100644 --- a/drivers/serial/imx.c +++ b/drivers/serial/imx.c @@ -356,10 +356,12 @@ static irqreturn_t imx_rxint(int irq, void *dev_id) spin_lock_irqsave(&sport->port.lock,flags); - while ((rx = readl(sport->port.membase + URXD0)) & URXD_CHARRDY) { + while (readl(sport->port.membase + USR2) & USR2_RDR) { flg = TTY_NORMAL; sport->port.icount.rx++; + rx = readl(sport->port.membase + URXD0); + temp = readl(sport->port.membase + USR2); if (temp & USR2_BRCD) { writel(temp | USR2_BRCD, sport->port.membase + USR2); |