[PATCH 3.16.y-ckt 081/126] drm/ast: Initialized data needed to map fbdev memory

[Luis Henriques]

3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.

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

From: Egbert Eich <eich@xxxxxxx>

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 <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Egbert Eich <eich@xxxxxxx>
[pulled from SuSE tree by me - airlied]
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
 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 5d6a87573c33..7a49bd9fdacc 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -310,6 +310,7 @@ 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 a28640f47c27..b55b6b1c9fe2 100644
--- a/drivers/gpu/drm/ast/ast_fb.c
+++ b/drivers/gpu/drm/ast/ast_fb.c
@@ -367,3 +367,10 @@ 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 b792194e0d9c..0dfefbf929a3 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -385,6 +385,7 @@ 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 1550d80ea2bc..d7e615282d38 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -522,6 +522,8 @@ 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);
 
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