drm/exynos: Add fallback option to get non physically contiguous memory for fb

While trying to get boot-logo up on exynos5420 SMDK which has eDP panel
connected with resolution 2560x1600, following error occured even with
IOMMU enabled:
[0.880000] [drm:lowlevel_buffer_allocate] *ERROR* failed to allocate buffer.
[0.890000] [drm] Initialized exynos 1.0.0 20110530 on minor 0

To address the cases where physically contiguous memory MAY NOT be a
mandatory requirement for fb, the patch adds a feature to get non physically
contiguous memory for fb if physically contiguous memory allocation fails
and if IOMMU is supported.

Signed-off-by: Vikas Sajjan <vikas.sajjan@linaro.org>
Signed-off-by: Arun Kumar <arun.kk@samsung.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
index 8e60bd61137f..f82a1d4a0fcb 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -16,6 +16,7 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/exynos_drm.h>
 
 #include "exynos_drm_drv.h"
 #include "exynos_drm_fb.h"
@@ -165,8 +166,18 @@ static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 
         size = mode_cmd.pitches[0] * mode_cmd.height;
 
-        /* 0 means to allocate physically continuous memory */
-        exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
+        exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
+        /*
+         * If physically contiguous memory allocation fails and if IOMMU is
+         * supported then try to get buffer from non physically contiguous
+         * memory area.
+         */
+        if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
+                dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
+                exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
+                                                        size);
+        }
+
         if (IS_ERR(exynos_gem_obj)) {
                 ret = PTR_ERR(exynos_gem_obj);
                 goto err_release_framebuffer;