recipes/linux/omap3-pandora-kernel/fix-irq33.diff

   1 From: "Nathan Monson" <nmonson@gmail.com>
   2 To: "linux-omap@vger.kernel.org List" <linux-omap@vger.kernel.org>
   3 Subject: Re: omapfb: help from userspace
   4 Cc: "TK, Pratheesh Gangadhar" <pratheesh@ti.com>
   5
   6 On Wed, Oct 8, 2008 at 11:36 AM, Nathan Monson <nmonson@gmail.com> wrote:
   7 > "Felipe Contreras" <felipe.contreras@gmail.com> writes:
   8 >> irq -33, desc: c0335cf8, depth: 0, count: 0, unhandled: 0
   9 >
  10 > On the BeagleBoard list, Pratheesh Gangadhar said that mapping I/O
  11 > regions as Strongly Ordered suppresses this problem:
  12 > http://groups.google.com/group/beagleboard/browse_thread/thread/23e1c95b4bfb09b5/70d12dca569ca503?show_docid=70d12dca569ca503
  13
  14 Pratheesh helped me make a patch against the latest linux-omap git to
  15 try this.
  16
  17 With this patch, my IRQ -33 problems with the DSP have disappeared.
  18 Before, I would end up in IRQ -33 loop after 10 invocations of the DSP
  19 Bridge 'ping.out' utility.  I just finished running it 50,000 times
  20 without error.
  21
  22 As stated before, this patch is just a workaround for testing
  23 purposes, not a fix.  Who knows what performance side effects it
  24 has...
  25
  26 ---
  27 diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h
  28 index 9eb936e..5cb4f5f 100644
  29 --- a/arch/arm/include/asm/mach/map.h
  30 +++ b/arch/arm/include/asm/mach/map.h
  31 @@ -25,6 +25,7 @@ struct map_desc {
  32  #define MT_HIGH_VECTORS                8
  33  #define MT_MEMORY              9
  34  #define MT_ROM                 10
  35 +#define MT_MEMORY_SO           11
  36
  37  #define MT_NONSHARED_DEVICE    MT_DEVICE_NONSHARED
  38  #define MT_IXP2000_DEVICE      MT_DEVICE_IXP2000
  39 diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
  40 index adbe21f..c11c0e8 100644
  41 --- a/arch/arm/mach-omap2/io.c
  42 +++ b/arch/arm/mach-omap2/io.c
  43 @@ -119,13 +119,13 @@ static struct map_desc omap34xx_io_desc[] __initdata = {
  44                 .virtual        = L3_34XX_VIRT,
  45                 .pfn            = __phys_to_pfn(L3_34XX_PHYS),
  46                 .length         = L3_34XX_SIZE,
  47 -               .type           = MT_DEVICE
  48 +               .type           = MT_MEMORY_SO
  49         },
  50         {
  51                 .virtual        = L4_34XX_VIRT,
  52                 .pfn            = __phys_to_pfn(L4_34XX_PHYS),
  53                 .length         = L4_34XX_SIZE,
  54 -               .type           = MT_DEVICE
  55 +               .type           = MT_MEMORY_SO
  56         },
  57         {
  58                 .virtual        = L4_WK_34XX_VIRT,
  59 @@ -137,19 +137,19 @@ static struct map_desc omap34xx_io_desc[] __initdata = {
  60                 .virtual        = OMAP34XX_GPMC_VIRT,
  61                 .pfn            = __phys_to_pfn(OMAP34XX_GPMC_PHYS),
  62                 .length         = OMAP34XX_GPMC_SIZE,
  63 -               .type           = MT_DEVICE
  64 +               .type           = MT_MEMORY_SO
  65         },
  66         {
  67                 .virtual        = OMAP343X_SMS_VIRT,
  68                 .pfn            = __phys_to_pfn(OMAP343X_SMS_PHYS),
  69                 .length         = OMAP343X_SMS_SIZE,
  70 -               .type           = MT_DEVICE
  71 +               .type           = MT_MEMORY_SO
  72         },
  73         {
  74                 .virtual        = OMAP343X_SDRC_VIRT,
  75                 .pfn            = __phys_to_pfn(OMAP343X_SDRC_PHYS),
  76                 .length         = OMAP343X_SDRC_SIZE,
  77 -               .type           = MT_DEVICE
  78 +               .type           = MT_MEMORY_SO
  79         },
  80         {
  81                 .virtual        = L4_PER_34XX_VIRT,
  82 @@ -161,7 +161,7 @@ static struct map_desc omap34xx_io_desc[] __initdata = {
  83                 .virtual        = L4_EMU_34XX_VIRT,
  84                 .pfn            = __phys_to_pfn(L4_EMU_34XX_PHYS),
  85                 .length         = L4_EMU_34XX_SIZE,
  86 -               .type           = MT_DEVICE
  87 +               .type           = MT_MEMORY_SO
  88         },
  89  };
  90  #endif
  91 diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
  92 index a713e40..d5f25ad 100644
  93 --- a/arch/arm/mm/mmu.c
  94 +++ b/arch/arm/mm/mmu.c
  95 @@ -245,6 +245,10 @@ static struct mem_type mem_types[] = {
  96                 .prot_sect = PMD_TYPE_SECT,
  97                 .domain    = DOMAIN_KERNEL,
  98         },
  99 +       [MT_MEMORY_SO] = {
 100 +               .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_UNCACHED,
 101 +               .domain    = DOMAIN_KERNEL,
 102 +       },
 103  };
 104
 105  const struct mem_type *get_mem_type(unsigned int type)
 106 --
 107 --
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