[PATCH 4.2.y-ckt 107/211] drm/ast: Initialized data needed to map fbdev memory

[Kamal Mostafa]

4.2.8-ckt1 -stable review patch.  If anyone has any objections, please let me 
know.

------------------

From: Egbert Eich <e...@suse.de>

commit 28fb4cb7fa6f63dc2fbdb5f2564dcbead8e3eee0 upstream.

Due to a missing initialization there was no way to map fbdev memory.
Thus for example using the Xserver with the fbdev driver failed.
This fix adds initialization for fix.smem_start and fix.smem_len
in the fb_info structure, which fixes this problem.

Requested-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Signed-off-by: Egbert Eich <e...@suse.de>
[pulled from SuSE tree by me - airlied]
Signed-off-by: Dave Airlie <airl...@redhat.com>

Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
 drivers/gpu/drm/ast/ast_drv.h  | 1 +
 drivers/gpu/drm/ast/ast_fb.c   | 7 +++++++
 drivers/gpu/drm/ast/ast_main.c | 1 +
 drivers/gpu/drm/ast/ast_mode.c | 2 ++
 4 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index 86205a2..05f6522 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -315,6 +315,7 @@ int ast_framebuffer_init(struct drm_device *dev,
 int ast_fbdev_init(struct drm_device *dev);
 void ast_fbdev_fini(struct drm_device *dev);
 void ast_fbdev_set_suspend(struct drm_device *dev, int state);
+void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr);
 
 struct ast_bo {
        struct ttm_buffer_object bo;
diff --git a/drivers/gpu/drm/ast/ast_fb.c b/drivers/gpu/drm/ast/ast_fb.c
index ff68eef..9b71fd6 100644
--- a/drivers/gpu/drm/ast/ast_fb.c
+++ b/drivers/gpu/drm/ast/ast_fb.c
@@ -379,3 +379,10 @@ void ast_fbdev_set_suspend(struct drm_device *dev, int 
state)
 
        fb_set_suspend(ast->fbdev->helper.fbdev, state);
 }
+
+void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
+{
+       ast->fbdev->helper.fbdev->fix.smem_start =
+               ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
+       ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
+}
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 035dacc..5b5d431 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -448,6 +448,7 @@ int ast_driver_load(struct drm_device *dev, unsigned long 
flags)
        dev->mode_config.min_height = 0;
        dev->mode_config.preferred_depth = 24;
        dev->mode_config.prefer_shadow = 1;
+       dev->mode_config.fb_base = pci_resource_start(ast->dev->pdev, 0);
 
        if (ast->chip == AST2100 ||
            ast->chip == AST2200 ||
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index b7ee263..69d19f3 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -547,6 +547,8 @@ static int ast_crtc_do_set_base(struct drm_crtc *crtc,
                ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
                if (ret)
                        DRM_ERROR("failed to kmap fbcon\n");
+               else
+                       ast_fbdev_set_base(ast, gpu_addr);
        }
        ast_bo_unreserve(bo);
 
-- 
1.9.1

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