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| author | Sascha Hauer <sascha@saschahauer.de> | 2008-04-17 08:43:14 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-04-17 16:18:20 +0100 |
| commit | 0d3c3938ff9855d8996db4083efd62e86b8987eb (patch) | |
| tree | 508644741e30c68866fc414b64bb0e0eca51af03 | |
| parent | 864eeed051b527c8081e2f85b51ba24823acaf71 (diff) | |
| download | linux-0d3c3938ff9855d8996db4083efd62e86b8987eb.tar.gz | |
[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>
| -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); |