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drm/omapdrm: Use GEM mmap for fbdev emulation

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The fbdev emulation currently uses fbdev's default mmap code, which
has been written for I/O memory. Provide an mmap that uses GEM's mmap
infrastructure.

Utilize fine-grained fbdev macros to initialize struct fb_ops. The
macros set the read/write and the draw callbacks for DMA memory. Set
the fb_mmap callback to omapdrm's new mmap helper. Also select the
correct Kconfig token for fbdev's DMA helpers. Note that the DMA
helpers are the same as for system memory.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Cc: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230707083422.18691-10-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-07-07 10:32:00 +02:00
parent 413b75745f
commit da6eb399d4
2 changed files with 14 additions and 3 deletions
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2
drivers/gpu/drm/omapdrm/Kconfig
View File

@ -4,7 +4,7 @@ config DRM_OMAP
depends on DRM && OF
depends on ARCH_OMAP2PLUS
select DRM_KMS_HELPER
select FB_SYS_HELPERS if DRM_FBDEV_EMULATION
select FB_DMA_HELPERS if DRM_FBDEV_EMULATION
select VIDEOMODE_HELPERS
select HDMI
default n

15
drivers/gpu/drm/omapdrm/omap_fbdev.c
View File

@ -76,6 +76,15 @@ static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
return drm_fb_helper_pan_display(var, fbi);
}
static int omap_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *helper = info->par;
struct drm_framebuffer *fb = helper->fb;
struct drm_gem_object *bo = drm_gem_fb_get_obj(fb, 0);
return drm_gem_mmap_obj(bo, omap_gem_mmap_size(bo), vma);
}
static void omap_fbdev_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
@ -97,14 +106,16 @@ static void omap_fbdev_fb_destroy(struct fb_info *info)
static const struct fb_ops omap_fb_ops = {
.owner = THIS_MODULE,
FB_DEFAULT_SYS_OPS,
__FB_DEFAULT_DMA_OPS_RDWR,
.fb_check_var = drm_fb_helper_check_var,
.fb_set_par = drm_fb_helper_set_par,
.fb_setcmap = drm_fb_helper_setcmap,
.fb_blank = drm_fb_helper_blank,
.fb_pan_display = omap_fbdev_pan_display,
__FB_DEFAULT_DMA_OPS_DRAW,
.fb_ioctl = drm_fb_helper_ioctl,
.fb_destroy = omap_fbdev_fb_destroy,
.fb_mmap = omap_fbdev_fb_mmap,
.fb_destroy = omap_fbdev_fb_destroy,
};
static int omap_fbdev_create(struct drm_fb_helper *helper,