1 files changed, 101 insertions, 0 deletions

diff --git a/meta/recipes-kernel/linux/linux-omap-2.6.29/dss2/0049-DSS2-VRAM-clear-allocated-area-with-DMA.patch b/meta/recipes-kernel/linux/linux-omap-2.6.29/dss2/0049-DSS2-VRAM-clear-allocated-area-with-DMA.patch
new file mode 100644
index 0000000000..e9fc76ce15
--- /dev/null
+++ b/meta/recipes-kernel/linux/linux-omap-2.6.29/dss2/0049-DSS2-VRAM-clear-allocated-area-with-DMA.patch
@@ -0,0 +1,101 @@
+From 02034cc79f69512a6037f03ad1243c28f59fdd8a Mon Sep 17 00:00:00 2001
+From: Tomi Valkeinen <tomi.valkeinen@nokia.com>
+Date: Wed, 22 Apr 2009 10:25:20 +0300
+Subject: [PATCH] DSS2: VRAM: clear allocated area with DMA
+
+Use DMA constant fill feature to clear VRAM area when
+someone allocates it.
+---
+ arch/arm/plat-omap/vram.c |   57 +++++++++++++++++++++++++++++++++++++++++++++
+ 1 files changed, 57 insertions(+), 0 deletions(-)
+
+diff --git a/arch/arm/plat-omap/vram.c b/arch/arm/plat-omap/vram.c
+index 8e9fe77..90276ac 100644
+--- a/arch/arm/plat-omap/vram.c
++++ b/arch/arm/plat-omap/vram.c
+@@ -31,11 +31,13 @@
+ #include <linux/seq_file.h>
+ #include <linux/bootmem.h>
+ #include <linux/omapfb.h>
++#include <linux/completion.h>
+ 
+ #include <asm/setup.h>
+ 
+ #include <mach/sram.h>
+ #include <mach/vram.h>
++#include <mach/dma.h>
+ 
+ #ifdef DEBUG
+ #define DBG(format, ...) printk(KERN_DEBUG "VRAM: " format, ## __VA_ARGS__)
+@@ -276,6 +278,59 @@ int omap_vram_reserve(unsigned long paddr, size_t size)
+ }
+ EXPORT_SYMBOL(omap_vram_reserve);
+ 
++static void _omap_vram_dma_cb(int lch, u16 ch_status, void *data)
++{
++       struct completion *compl = data;
++       complete(compl);
++}
++
++static int _omap_vram_clear(u32 paddr, unsigned pages)
++{
++       struct completion compl;
++        unsigned elem_count;
++        unsigned frame_count;
++       int r;
++       int lch;
++
++       init_completion(&compl);
++
++        r = omap_request_dma(OMAP_DMA_NO_DEVICE, "VRAM DMA",
++                       _omap_vram_dma_cb,
++                        &compl, &lch);
++        if (r) {
++               pr_err("VRAM: request_dma failed for memory clear\n");
++               return -EBUSY;
++       }
++
++        elem_count = pages * PAGE_SIZE / 4;
++        frame_count = 1;
++
++        omap_set_dma_transfer_params(lch, OMAP_DMA_DATA_TYPE_S32,
++                        elem_count, frame_count,
++                        OMAP_DMA_SYNC_ELEMENT,
++                        0, 0);
++
++        omap_set_dma_dest_params(lch, 0, OMAP_DMA_AMODE_POST_INC,
++                       paddr, 0, 0);
++
++       omap_set_dma_color_mode(lch, OMAP_DMA_CONSTANT_FILL, 0x000000);
++
++        omap_start_dma(lch);
++
++       if (wait_for_completion_timeout(&compl, msecs_to_jiffies(1000)) == 0) {
++               omap_stop_dma(lch);
++               pr_err("VRAM: dma timeout while clearing memory\n");
++               r = -EIO;
++               goto err;
++       }
++
++       r = 0;
++err:
++       omap_free_dma(lch);
++
++       return r;
++}
++
+ static int _omap_vram_alloc(int mtype, unsigned pages, unsigned long *paddr)
+ {
+        struct vram_region *rm;
+@@ -313,6 +368,8 @@ found:
+ 
+                *paddr = start;
+ 
++               _omap_vram_clear(start, pages);
++
+                return 0;
+        }
+ 
+-- 
+1.5.6.5
+