lkml.org 
[lkml]   [2012]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/3] fbdev: sh_mobile_lcdc: use dma_mmap_coherent if available
Date
fb_mmap() implemented in fbmem.c uses smem_start as the physical
address of the frame buffer. In the sh_mobile_lcdc driver, the
smem_start is a dma_addr_t that is not a physical address when IOMMU is
enabled. dma_mmap_coherent() maps the address correctly. It is
available on ARM platforms.

Signed-off-by: Hideki EIRAKU <hdk@igel.co.jp>
---
drivers/video/sh_mobile_lcdcfb.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index e672698..65732c4 100644
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -1393,6 +1393,17 @@ static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
return 0;
}

+#ifdef ARCH_HAS_DMA_MMAP_COHERENT
+static int
+sh_mobile_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+ struct sh_mobile_lcdc_chan *ch = info->par;
+
+ return dma_mmap_coherent(ch->lcdc->dev, vma, ch->fb_mem,
+ ch->dma_handle, ch->fb_size);
+}
+#endif
+
static struct fb_ops sh_mobile_lcdc_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = sh_mobile_lcdc_setcolreg,
@@ -1408,6 +1419,9 @@ static struct fb_ops sh_mobile_lcdc_ops = {
.fb_release = sh_mobile_release,
.fb_check_var = sh_mobile_check_var,
.fb_set_par = sh_mobile_set_par,
+#ifdef ARCH_HAS_DMA_MMAP_COHERENT
+ .fb_mmap = sh_mobile_fb_mmap,
+#endif
};

static void
--
1.7.0.4


\
 
 \ /
  Last update: 2012-07-25 09:21    [W:0.049 / U:1.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site