On Monday 05 of August 2013 15:14:42 Vikas Sajjan wrote:

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 case where physically continous memory MAY NOT be a mandatory requirement for fb, the patch adds a feature to get non physically continous memory for fb if IOMMU is supported and if CONTIG memory allocation fails.

Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org Signed-off-by: Arun Kumar arun.kk@samsung.com

---

changes since v1: - Modified to add the fallback patch if CONTIG alloc fails as suggested by Rob Clark robdclark@gmail.com and Tomasz Figa tomasz.figa@gmail.com.

- changed the commit message.

---

drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c index 8e60bd6..9a4b886 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" @@ -165,11 +166,21 @@ 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);

You can put the fallback here like this: if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) { /* * If IOMMU is supported then try to get buffer from * non-continous memory area */ 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;
  

And then you can leave this original check untouched, reducing the diffstat and unnecessary code indentation.

• /*
  

•  * If IOMMU is supported then try to get buffer from
  

•  * non-continous memory area
  

•  */
  

• if (is_drm_iommu_supported(dev))
  

• 	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;
  

• }
  

• dev_warn(&pdev->dev, "exynos_gem_obj for FB is allocated with\n"
  

• 		"non physically continuous memory\n");
  

Please don't split messages into multiple lines, because this makes grepping for them harder (and checkpatch complains).

Best regards, Tomasz