diff options
| -rw-r--r-- | drivers/video/sm501fb.c | 53 |
1 files changed, 42 insertions, 11 deletions
diff --git a/drivers/video/sm501fb.c b/drivers/video/sm501fb.c index b473cf665d8..f94ae84a58c 100644 --- a/drivers/video/sm501fb.c +++ b/drivers/video/sm501fb.c @@ -48,10 +48,15 @@ enum sm501_controller { HEAD_PANEL = 1, }; -/* SM501 memory address */ +/* SM501 memory address. + * + * This structure is used to track memory usage within the SM501 framebuffer + * allocation. The sm_addr field is stored as an offset as it is often used + * against both the physical and mapped addresses. + */ struct sm501_mem { unsigned long size; - unsigned long sm_addr; + unsigned long sm_addr; /* offset from base of sm501 fb. */ void __iomem *k_addr; }; @@ -142,37 +147,63 @@ static inline void sm501fb_sync_regs(struct sm501fb_info *info) static int sm501_alloc_mem(struct sm501fb_info *inf, struct sm501_mem *mem, unsigned int why, size_t size) { - unsigned int ptr = 0; - unsigned int end; + struct sm501fb_par *par; struct fb_info *fbi; + unsigned int ptr; + unsigned int end; switch (why) { case SM501_MEMF_CURSOR: ptr = inf->fbmem_len - size; - inf->fbmem_len = ptr; + inf->fbmem_len = ptr; /* adjust available memory. */ break; case SM501_MEMF_PANEL: ptr = inf->fbmem_len - size; - fbi = inf->fb[0]; + fbi = inf->fb[HEAD_CRT]; + + /* round down, some programs such as directfb do not draw + * 0,0 correctly unless the start is aligned to a page start. + */ + + if (ptr > 0) + ptr &= ~(PAGE_SIZE - 1); if (fbi && ptr < fbi->fix.smem_len) return -ENOMEM; + if (ptr < 0) + return -ENOMEM; + break; case SM501_MEMF_CRT: ptr = 0; + + /* check to see if we have panel memory allocated + * which would put an limit on available memory. */ + + fbi = inf->fb[HEAD_PANEL]; + if (fbi) { + par = fbi->par; + end = par->screen.k_addr ? par->screen.sm_addr : inf->fbmem_len; + } else + end = inf->fbmem_len; + + if ((ptr + size) > end) + return -ENOMEM; + break; case SM501_MEMF_ACCEL: - fbi = inf->fb[0]; + fbi = inf->fb[HEAD_CRT]; ptr = fbi ? fbi->fix.smem_len : 0; - fbi = inf->fb[1]; - if (fbi) - end = (fbi->fix.smem_start - inf->fbmem_res->start); - else + fbi = inf->fb[HEAD_PANEL]; + if (fbi) { + par = fbi->par; + end = par->screen.sm_addr; + } else end = inf->fbmem_len; if ((ptr + size) > end) |