[PATCH V3 11/16] drm/radeon: Make radeon card usable for Loongson.

[Huacai Chen <chenhuacai@xxxxxxxxx>]

1, Handle io prot correctly for MIPS.
2, Define SAREA_MAX as the size of one page.
3, Don't use swiotlb on Loongson machines (Loonson need swioitlb, but
   when use swiotlb, GPU reset occurs at resume from suspend).

Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
Signed-off-by: Hongliang Tao <taohl@xxxxxxxxxx>
Signed-off-by: Hua Yan <yanh@xxxxxxxxxx>
Reviewed-by: Michel Dänzer <michel@xxxxxxxxxxx>
Reviewed-by: Alex Deucher <alexdeucher@xxxxxxxxx>
Reviewed-by: Lucas Stach <dev@xxxxxxxxxx>
Reviewed-by: j.glisse <j.glisse@xxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
 drivers/gpu/drm/drm_vm.c            |    2 +-
 drivers/gpu/drm/radeon/radeon_ttm.c |    6 +++---
 drivers/gpu/drm/ttm/ttm_bo_util.c   |    2 +-
 include/drm/drm_sarea.h             |    2 ++
 4 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index 961ee08..3f06166 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -62,7 +62,7 @@ static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
 		tmp = pgprot_writecombine(tmp);
 	else
 		tmp = pgprot_noncached(tmp);
-#elif defined(__sparc__) || defined(__arm__)
+#elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
 	tmp = pgprot_noncached(tmp);
 #endif
 	return tmp;
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index c94a225..f49bdd1 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -630,7 +630,7 @@ static int radeon_ttm_tt_populate(struct ttm_tt *ttm)
 	}
 #endif
 
-#ifdef CONFIG_SWIOTLB
+#if defined(CONFIG_SWIOTLB) && !defined(CONFIG_CPU_LOONGSON3)
 	if (swiotlb_nr_tbl()) {
 		return ttm_dma_populate(&gtt->ttm, rdev->dev);
 	}
@@ -676,7 +676,7 @@ static void radeon_ttm_tt_unpopulate(struct ttm_tt *ttm)
 	}
 #endif
 
-#ifdef CONFIG_SWIOTLB
+#if defined(CONFIG_SWIOTLB) && !defined(CONFIG_CPU_LOONGSON3)
 	if (swiotlb_nr_tbl()) {
 		ttm_dma_unpopulate(&gtt->ttm, rdev->dev);
 		return;
@@ -906,7 +906,7 @@ static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
 	radeon_mem_types_list[i].show = &ttm_page_alloc_debugfs;
 	radeon_mem_types_list[i].driver_features = 0;
 	radeon_mem_types_list[i++].data = NULL;
-#ifdef CONFIG_SWIOTLB
+#if defined(CONFIG_SWIOTLB) && !defined(CONFIG_CPU_LOONGSON3)
 	if (swiotlb_nr_tbl()) {
 		sprintf(radeon_mem_types_names[i], "ttm_dma_page_pool");
 		radeon_mem_types_list[i].name = radeon_mem_types_names[i];
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index f8187ea..0df71ea 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -472,7 +472,7 @@ pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
 	else
 		tmp = pgprot_noncached(tmp);
 #endif
-#if defined(__sparc__)
+#if defined(__sparc__) || defined(__mips__)
 	if (!(caching_flags & TTM_PL_FLAG_CACHED))
 		tmp = pgprot_noncached(tmp);
 #endif
diff --git a/include/drm/drm_sarea.h b/include/drm/drm_sarea.h
index ee5389d..1d1a858 100644
--- a/include/drm/drm_sarea.h
+++ b/include/drm/drm_sarea.h
@@ -37,6 +37,8 @@
 /* SAREA area needs to be at least a page */
 #if defined(__alpha__)
 #define SAREA_MAX                       0x2000U
+#elif defined(__mips__)
+#define SAREA_MAX                       0x4000U
 #elif defined(__ia64__)
 #define SAREA_MAX                       0x10000U	/* 64kB */
 #else
-- 
1.7.7.3