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arm: mvebu: Reduce reg-io-width with UARTs

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Setting the reg-io-width to 1 byte represents more accurate
description of the HW.

This will fix an issue where UART driver causes kernel
panic during bootup. Gregory CLEMENT traced the issue to
autoconfig() in 8250.c, where the existence of FIFO is
checked from UART_IIR register. The register is now read as
32-bit value as the reg-io-width is set to 4-bytes. The
retuned value seems to contain bogus data for bits 31:8,
causing the issue.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Heikki Krogerus 2013-03-06 11:23:33 +01:00 committed by Jason Cooper
parent 85c0c13dcd
commit e366154f70
2 changed files with 4 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
arch/arm/boot/dts/armada-370-xp.dtsi
View file

@ -54,7 +54,7 @@ serial@d0012000 {
reg = <0xd0012000 0x100>;
reg-shift = <2>;
interrupts = <41>;
reg-io-width = <4>;
reg-io-width = <1>;
status = "disabled";
};
serial@d0012100 {
@ -62,7 +62,7 @@ serial@d0012100 {
reg = <0xd0012100 0x100>;
reg-shift = <2>;
interrupts = <42>;
reg-io-width = <4>;
reg-io-width = <1>;
status = "disabled";
};

4
arch/arm/boot/dts/armada-xp.dtsi
View file

@ -46,7 +46,7 @@ serial@d0012200 {
reg = <0xd0012200 0x100>;
reg-shift = <2>;
interrupts = <43>;
reg-io-width = <4>;
reg-io-width = <1>;
status = "disabled";
};
serial@d0012300 {
@ -54,7 +54,7 @@ serial@d0012300 {
reg = <0xd0012300 0x100>;
reg-shift = <2>;
interrupts = <44>;
reg-io-width = <4>;
reg-io-width = <1>;
status = "disabled";
};