drm/exynos: consider no iommu support to console framebuffer

Commit Message

Inki Dae Dec. 21, 2012, 8:44 a.m. UTC

This patch considers no iommu support to kernel space mapping
of console framebuffer.

Without iommu, we get physical address instead of device address
after dma_alloc_attrs function is called. So we should consider
the case without iommu when it maps console framebuffer with
kernel space.

Signed-off-by: Inki Dae <[e-mail]>
Signed-off-by: Kyungmin Park <[e-mail]>
---
 drivers/gpu/drm/exynos/exynos_drm_fbdev.c |   20 +++++++++++++++++---
 1 files changed, 17 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index f433eb7..ae0607f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -34,6 +34,7 @@ 
 #include "exynos_drm_drv.h"
 #include "exynos_drm_fb.h"
 #include "exynos_drm_gem.h"
+#include "exynos_drm_iommu.h"
 
 #define MAX_CONNECTOR		4
 #define PREFERRED_BPP		32
@@ -111,9 +112,18 @@  static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 
 	/* map pages with kernel virtual space. */
 	if (!buffer->kvaddr) {
-		unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
-		buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
+		if (is_drm_iommu_supported(dev)) {
+			unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
+
+			buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
 					pgprot_writecombine(PAGE_KERNEL));
+		} else {
+			phys_addr_t dma_addr = buffer->dma_addr;
+			if (dma_addr)
+				buffer->kvaddr = phys_to_virt(dma_addr);
+			else
+				buffer->kvaddr = (void __iomem *)NULL;
+		}
 		if (!buffer->kvaddr) {
 			DRM_ERROR("failed to map pages to kernel space.\n");
 			return -EIO;
@@ -128,8 +138,12 @@  static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
 
 	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 	fbi->screen_base = buffer->kvaddr + offset;
-	fbi->fix.smem_start = (unsigned long)
+	if (is_drm_iommu_supported(dev))
+		fbi->fix.smem_start = (unsigned long)
 			(page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
+	else
+		fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
+
 	fbi->screen_size = size;
 	fbi->fix.smem_len = size;