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Commit 05911280 authored by Manuel Lauss's avatar Manuel Lauss Committed by Ralf Baechle
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MIPS: DB1200: Set Config[OD] for improved stability. 



Setting Config[OD] gets rid of a _LOT_ of spurious CPLD interrupts,
but also decreases overall performance a bit.

Signed-off-by: default avatarManuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Patchwork: https://patchwork.linux-mips.org/patch/2347/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 8b659a39

arch/mips/alchemy/common/setup.c

+2 −2
Original line number Diff line number Diff line
@@ -52,8 +52,6 @@ void __init plat_mem_setup(void) 
	/* this is faster than wasting cycles trying to approximate it */

	preset_lpj = (est_freq >> 1) / HZ;



	board_setup();  /* board specific setup */



	if (au1xxx_cpu_needs_config_od())

		/* Various early Au1xx0 errata corrected by this */

		set_c0_config(1 << 19); /* Set Config[OD] */
@@ -61,6 +59,8 @@ void __init plat_mem_setup(void) 
		/* Clear to obtain best system bus performance */

		clear_c0_config(1 << 19); /* Clear Config[OD] */



	board_setup();  /* board specific setup */



	/* IO/MEM resources. */

	set_io_port_base(0);

	ioport_resource.start = IOPORT_RESOURCE_START;

arch/mips/alchemy/devboards/db1200/setup.c

+7 −0
Original line number Diff line number Diff line
@@ -23,6 +23,13 @@ void __init board_setup(void) 
	unsigned long freq0, clksrc, div, pfc;

	unsigned short whoami;



	/* Set Config[OD] (disable overlapping bus transaction):

	 * This gets rid of a _lot_ of spurious interrupts (especially

	 * wrt. IDE); but incurs ~10% performance hit in some

	 * cpu-bound applications.

	 */

	set_c0_config(1 << 19);



	bcsr_init(DB1200_BCSR_PHYS_ADDR,

		  DB1200_BCSR_PHYS_ADDR + DB1200_BCSR_HEXLED_OFS);