I just split out heads as a separate data structure from drm_device. I
gave this a couple of hours of testing in different configurations but
I may have missed something. Please let me know.
I probably haven't figured out all of the variables that need to be
moved from drm_device to drm_head. If anyone is interested check out
drmP.h and tell me other candidates to be moved. At least I have the
basic structure split out, moving individual variables is easy.
The three main structures:
drm_driver - one per class of cards
drm_device - one for each physical card
drm_head - one for each head on a card
Heads need to track:
minor number
proc entry - one per card or per head?
sysfs entry
For framebuffer merge they also need:
legal mode list
current mode
location of scanout buffer
size of buffer
Merging DRM and fbdev is much more complicated than I though it was.
Neither fbdev or current DRM data structures are set up for multi-head
support. Both drivers need significant rework to support multihead.
Take for example struct fb_info, half of these variable are needed for
each head and half need to be only one per card.
struct fb_info {
int node; -per card
int flags; -per card
struct fb_var_screeninfo var; -per head
struct fb_fix_screeninfo fix; -per card
struct fb_monspecs monspecs; -per head
struct fb_cursor cursor; -per head
struct work_struct queue; -per card
struct timer_list cursor_timer; -per card
struct fb_pixmap pixmap; -per card
struct fb_pixmap sprite; -per card
struct fb_cmap cmap; -per head
struct list_head modelist; -per head
struct fb_ops *fbops; -per card
char __iomem *screen_base; -per head
unsigned long screen_size; -per head
int currcon; -per head
void *pseudo_palette; -per head
u32 state; -per card
};
--
Jon Smirl
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