From 3f40514a51b44171d274ef6a7d66dce9ae7c349d Mon Sep 17 00:00:00 2001 From: John Crispin Date: Fri, 24 May 2013 21:28:08 +0200 Subject: [PATCH 17/33] USB: MIPS: ralink: fix usb issue on mt7620 USB fails when frequency scaling is enabled. Increase the idle cpu speed when scaled. Signed-off-by: John Crispin --- arch/mips/include/asm/mach-ralink/mt7620.h | 1 + arch/mips/ralink/mt7620.c | 8 ++++++++ 2 files changed, 9 insertions(+) diff --git a/arch/mips/include/asm/mach-ralink/mt7620.h b/arch/mips/include/asm/mach-ralink/mt7620.h index 9809972..d469c69 100644 --- a/arch/mips/include/asm/mach-ralink/mt7620.h +++ b/arch/mips/include/asm/mach-ralink/mt7620.h @@ -20,6 +20,7 @@ #define SYSC_REG_CHIP_REV 0x0c #define SYSC_REG_SYSTEM_CONFIG0 0x10 #define SYSC_REG_SYSTEM_CONFIG1 0x14 +#define SYSC_REG_CPU_SYS_CLKCFG 0x3c #define SYSC_REG_CPLL_CONFIG0 0x54 #define SYSC_REG_CPLL_CONFIG1 0x58 diff --git a/arch/mips/ralink/mt7620.c b/arch/mips/ralink/mt7620.c index 96422e5..6f6b1c8 100644 --- a/arch/mips/ralink/mt7620.c +++ b/arch/mips/ralink/mt7620.c @@ -185,6 +185,14 @@ void __init ralink_clk_init(void) ralink_clk_add("10000500.uart", 40000000); ralink_clk_add("10000b00.spi", 40000000); ralink_clk_add("10000c00.uartlite", 40000000); + +#ifdef CONFIG_USB + /* + * When the CPU goes into sleep mode, the BUS clock will be too low for + * USB to function properly + */ + rt_sysc_m32(0x1f1f, 0x303, SYSC_REG_CPU_SYS_CLKCFG); +#endif } void __init ralink_of_remap(void) -- 1.7.10.4