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Commit a1bfacf4 authored by Vikas Sajjan's avatar Vikas Sajjan Committed by Inki Dae
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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: default avatarVikas Sajjan <vikas.sajjan@linaro.org>
Signed-off-by: default avatarArun Kumar <arun.kk@samsung.com>
Reviewed-by: default avatarRob Clark <robdclark@gmail.com>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
parent 3b28802e

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

+13 −2
Original line number Diff line number Diff line
@@ -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;