target/linux/ramips/patches-3.8/0074-USB-MIPS-ralink-fix-usb-issue-on-mt7620.patch

   1 From 93bb6d731e96dc373b88a910ca9db66c560c8f4e Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Fri, 24 May 2013 21:28:08 +0200
   4 Subject: [PATCH 74/79] USB: MIPS: ralink: fix usb issue on mt7620
   5
   6 USB fails when frequency scaling is enabled. Increase the idle cpu speed when
   7 scaled.
   8
   9 Signed-off-by: John Crispin <blogic@openwrt.org>
  10 ---
  11  arch/mips/include/asm/mach-ralink/mt7620.h |    1 +
  12  arch/mips/ralink/mt7620.c                  |    8 ++++++++
  13  2 files changed, 9 insertions(+)
  14
  15 diff --git a/arch/mips/include/asm/mach-ralink/mt7620.h b/arch/mips/include/asm/mach-ralink/mt7620.h
  16 index 9809972..d469c69 100644
  17 --- a/arch/mips/include/asm/mach-ralink/mt7620.h
  18 +++ b/arch/mips/include/asm/mach-ralink/mt7620.h
  19 @@ -20,6 +20,7 @@
  20  #define SYSC_REG_CHIP_REV              0x0c
  21  #define SYSC_REG_SYSTEM_CONFIG0                0x10
  22  #define SYSC_REG_SYSTEM_CONFIG1                0x14
  23 +#define SYSC_REG_CPU_SYS_CLKCFG                0x3c
  24  #define SYSC_REG_CPLL_CONFIG0          0x54
  25  #define SYSC_REG_CPLL_CONFIG1          0x58
  26
  27 diff --git a/arch/mips/ralink/mt7620.c b/arch/mips/ralink/mt7620.c
  28 index 4956d96..d76eb85 100644
  29 --- a/arch/mips/ralink/mt7620.c
  30 +++ b/arch/mips/ralink/mt7620.c
  31 @@ -186,6 +186,14 @@ void __init ralink_clk_init(void)
  32         ralink_clk_add("10000500.uart", 40000000);
  33         ralink_clk_add("10000b00.spi", 40000000);
  34         ralink_clk_add("10000c00.uartlite", 40000000);
  35 +
  36 +#ifdef CONFIG_USB
  37 +       /*
  38 +        * When the CPU goes into sleep mode, the BUS clock will be too low for
  39 +        * USB to function properly
  40 +        */
  41 +       rt_sysc_m32(0x1f1f, 0x303, SYSC_REG_CPU_SYS_CLKCFG);
  42 +#endif
  43  }
  44
  45  void __init ralink_of_remap(void)
  46 --
  47 1.7.10.4
  48