fbdev: sh_mobile_lcdc: use dma_mmap_coherent

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.

Signed-off-by: Hideki EIRAKU <hdk@igel.co.jp>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index 699487c287b2..bccfd7eff39b 100644
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -1614,6 +1614,15 @@ static int sh_mobile_lcdc_overlay_blank(int blank, struct fb_info *info)
         return 1;
 }
 
+static int
+sh_mobile_lcdc_overlay_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+        struct sh_mobile_lcdc_overlay *ovl = info->par;
+
+        return dma_mmap_coherent(ovl->channel->lcdc->dev, vma, ovl->fb_mem,
+                                 ovl->dma_handle, ovl->fb_size);
+}
+
 static struct fb_ops sh_mobile_lcdc_overlay_ops = {
         .owner          = THIS_MODULE,
         .fb_read        = fb_sys_read,
@@ -1626,6 +1635,7 @@ static struct fb_ops sh_mobile_lcdc_overlay_ops = {
         .fb_ioctl       = sh_mobile_lcdc_overlay_ioctl,
         .fb_check_var   = sh_mobile_lcdc_overlay_check_var,
         .fb_set_par     = sh_mobile_lcdc_overlay_set_par,
+        .fb_mmap        = sh_mobile_lcdc_overlay_mmap,
 };
 
 static void
@@ -2093,6 +2103,15 @@ static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
         return 0;
 }
 
+static int
+sh_mobile_lcdc_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);
+}
+
 static struct fb_ops sh_mobile_lcdc_ops = {
         .owner          = THIS_MODULE,
         .fb_setcolreg   = sh_mobile_lcdc_setcolreg,
@@ -2108,6 +2127,7 @@ static struct fb_ops sh_mobile_lcdc_ops = {
         .fb_release     = sh_mobile_lcdc_release,
         .fb_check_var   = sh_mobile_lcdc_check_var,
         .fb_set_par     = sh_mobile_lcdc_set_par,
+        .fb_mmap        = sh_mobile_lcdc_mmap,
 };
 
 static void