Re-send the patch to remove the unnecessary initialization and the comment
> This change implements msm drm specific fb_mmap function for fb device
> to properly map the fb address to userspace.
>
> Signed-off-by: Hai Li <hali@xxxxxxxxxxxxxx>
> Signed-off-by: Stephane Viau <sviau@xxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/msm_fbdev.c | 38
> ++++++++++++++++++++++++++++++++++++--
> 1 file changed, 36 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_fbdev.c
> b/drivers/gpu/drm/msm/msm_fbdev.c
> index a752ab8..2694e90 100644
> --- a/drivers/gpu/drm/msm/msm_fbdev.c
> +++ b/drivers/gpu/drm/msm/msm_fbdev.c
> @@ -19,6 +19,11 @@
>
> #include "drm_crtc.h"
> #include "drm_fb_helper.h"
> +#include "msm_gem.h"
> +
> +extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
> + struct vm_area_struct *vma);
> +static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct
> *vma);
>
> /*
> * fbdev funcs, to implement legacy fbdev interface on top of drm driver
> @@ -43,6 +48,7 @@ static struct fb_ops msm_fb_ops = {
> .fb_fillrect = sys_fillrect,
> .fb_copyarea = sys_copyarea,
> .fb_imageblit = sys_imageblit,
> + .fb_mmap = msm_fbdev_mmap,
>
> .fb_check_var = drm_fb_helper_check_var,
> .fb_set_par = drm_fb_helper_set_par,
> @@ -51,6 +57,31 @@ static struct fb_ops msm_fb_ops = {
> .fb_setcmap = drm_fb_helper_setcmap,
> };
>
> +static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct
> *vma)
> +{
> + struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
> + struct msm_fbdev *fbdev = to_msm_fbdev(helper);
> + struct drm_gem_object *drm_obj = fbdev->bo;
> + struct drm_device *dev = helper->dev;
> + int ret;
> +
> + if (drm_device_is_unplugged(dev))
> + return -ENODEV;
> +
> + mutex_lock(&dev->struct_mutex);
> +
> + ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
> +
> + mutex_unlock(&dev->struct_mutex);
> +
> + if (ret) {
> + pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
> + return ret;
> + }
> +
> + return msm_gem_mmap_obj(drm_obj, vma);
> +}
> +
> static int msm_fbdev_create(struct drm_fb_helper *helper,
> struct drm_fb_helper_surface_size *sizes)
> {
> @@ -104,8 +135,11 @@ static int msm_fbdev_create(struct drm_fb_helper
> *helper,
>
> mutex_lock(&dev->struct_mutex);
>
> - /* TODO implement our own fb_mmap so we don't need this: */
> - msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
> + ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
> + if (ret) {
> + dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
> + goto fail;
> + }
>
> fbi = framebuffer_alloc(0, dev->dev);
> if (!fbi) {
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
>
>
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