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From: "Nathan Monson" <nmonson@gmail.com>
To: "linux-omap@vger.kernel.org List" <linux-omap@vger.kernel.org>
Subject: Re: omapfb: help from userspace
Cc: "TK, Pratheesh Gangadhar" <pratheesh@ti.com>
On Wed, Oct 8, 2008 at 11:36 AM, Nathan Monson <nmonson@gmail.com> wrote:
> "Felipe Contreras" <felipe.contreras@gmail.com> writes:
>> irq -33, desc: c0335cf8, depth: 0, count: 0, unhandled: 0
>
> On the BeagleBoard list, Pratheesh Gangadhar said that mapping I/O
> regions as Strongly Ordered suppresses this problem:
> http://groups.google.com/group/beagleboard/browse_thread/thread/23e1c95b4bfb09b5/70d12dca569ca503?show_docid=70d12dca569ca503
Pratheesh helped me make a patch against the latest linux-omap git to
try this.
With this patch, my IRQ -33 problems with the DSP have disappeared.
Before, I would end up in IRQ -33 loop after 10 invocations of the DSP
Bridge 'ping.out' utility. I just finished running it 50,000 times
without error.
As stated before, this patch is just a workaround for testing
purposes, not a fix. Who knows what performance side effects it
has...
---
diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h
index 9eb936e..5cb4f5f 100644
--- a/arch/arm/include/asm/mach/map.h
+++ b/arch/arm/include/asm/mach/map.h
@@ -25,6 +25,7 @@ struct map_desc {
#define MT_HIGH_VECTORS 8
#define MT_MEMORY 9
#define MT_ROM 10
+#define MT_MEMORY_SO 11
#define MT_NONSHARED_DEVICE MT_DEVICE_NONSHARED
#define MT_IXP2000_DEVICE MT_DEVICE_IXP2000
diff --git a/arch/arm/mach-omap2/io.c b/arch/arm/mach-omap2/io.c
index adbe21f..c11c0e8 100644
--- a/arch/arm/mach-omap2/io.c
+++ b/arch/arm/mach-omap2/io.c
@@ -119,13 +119,13 @@ static struct map_desc omap34xx_io_desc[] __initdata = {
.virtual = L3_34XX_VIRT,
.pfn = __phys_to_pfn(L3_34XX_PHYS),
.length = L3_34XX_SIZE,
- .type = MT_DEVICE
+ .type = MT_MEMORY_SO
},
{
.virtual = L4_34XX_VIRT,
.pfn = __phys_to_pfn(L4_34XX_PHYS),
.length = L4_34XX_SIZE,
- .type = MT_DEVICE
+ .type = MT_MEMORY_SO
},
{
.virtual = L4_WK_34XX_VIRT,
@@ -137,19 +137,19 @@ static struct map_desc omap34xx_io_desc[] __initdata = {
.virtual = OMAP34XX_GPMC_VIRT,
.pfn = __phys_to_pfn(OMAP34XX_GPMC_PHYS),
.length = OMAP34XX_GPMC_SIZE,
- .type = MT_DEVICE
+ .type = MT_MEMORY_SO
},
{
.virtual = OMAP343X_SMS_VIRT,
.pfn = __phys_to_pfn(OMAP343X_SMS_PHYS),
.length = OMAP343X_SMS_SIZE,
- .type = MT_DEVICE
+ .type = MT_MEMORY_SO
},
{
.virtual = OMAP343X_SDRC_VIRT,
.pfn = __phys_to_pfn(OMAP343X_SDRC_PHYS),
.length = OMAP343X_SDRC_SIZE,
- .type = MT_DEVICE
+ .type = MT_MEMORY_SO
},
{
.virtual = L4_PER_34XX_VIRT,
@@ -161,7 +161,7 @@ static struct map_desc omap34xx_io_desc[] __initdata = {
.virtual = L4_EMU_34XX_VIRT,
.pfn = __phys_to_pfn(L4_EMU_34XX_PHYS),
.length = L4_EMU_34XX_SIZE,
- .type = MT_DEVICE
+ .type = MT_MEMORY_SO
},
};
#endif
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index a713e40..d5f25ad 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -245,6 +245,10 @@ static struct mem_type mem_types[] = {
.prot_sect = PMD_TYPE_SECT,
.domain = DOMAIN_KERNEL,
},
+ [MT_MEMORY_SO] = {
+ .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_UNCACHED,
+ .domain = DOMAIN_KERNEL,
+ },
};
const struct mem_type *get_mem_type(unsigned int type)
--
--
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