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 <h...@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
--
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