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authorPaul Gortmaker <paul.gortmaker@windriver.com>2011-12-04 18:42:23 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-12-09 19:14:13 -0800
commit9deaa53ac7fa373623123aa4f18828dd62292b1a (patch)
tree938b41e9c534582f9152386ce1ee6893c3274c6b /arch/powerpc
parent86b21199fc45e0052e181fefc07c747e9dc903b3 (diff)
downloadop-kernel-dev-9deaa53ac7fa373623123aa4f18828dd62292b1a.zip
op-kernel-dev-9deaa53ac7fa373623123aa4f18828dd62292b1a.tar.gz
serial: add irq handler for Freescale 16550 errata.
Sending a break on the SOC UARTs found in some MPC83xx/85xx/86xx chips seems to cause a short lived IRQ storm (/proc/interrupts typically shows somewhere between 300 and 1500 events). Unfortunately this renders SysRQ over the serial console completely inoperable. The suggested workaround in the errata is to read the Rx register, wait one character period, and then read the Rx register again. We achieve this by tracking the old LSR value, and on the subsequent interrupt event after a break, we don't read LSR, instead we just read the RBR again and return immediately. The "fsl,ns16550" is used in the compatible field of the serial device to mark UARTs known to have this issue. Thanks to Scott Wood for providing the errata data which led to a much cleaner fix. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/legacy_serial.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/legacy_serial.c b/arch/powerpc/kernel/legacy_serial.c
index c7b5afe..3fea368 100644
--- a/arch/powerpc/kernel/legacy_serial.c
+++ b/arch/powerpc/kernel/legacy_serial.c
@@ -441,6 +441,9 @@ static void __init fixup_port_irq(int index,
return;
port->irq = virq;
+
+ if (of_device_is_compatible(np, "fsl,ns16550"))
+ port->handle_irq = fsl8250_handle_irq;
}
static void __init fixup_port_pio(int index,
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