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parisc: fix LMMIO mismatch between PAT length and MASK register

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The LMMIO length reported by PAT and the length given by the LBA MASK
register are not consistent. This leads e.g. to a not-working ATI FireGL
card with the radeon DRM driver since the memory can't be mapped.

Fix this by correctly adjusting the resource sizes.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # 3.10
This commit is contained in:
Helge Deller 2013-06-18 23:21:25 +02:00
parent d2b4a64671
commit dac76f1be5
1 changed files with 56 additions and 0 deletions
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56
drivers/parisc/lba_pci.c
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@ -613,6 +613,54 @@ truncate_pat_collision(struct resource *root, struct resource *new)
return 0; /* truncation successful */
}
/*
* extend_lmmio_len: extend lmmio range to maximum length
*
* This is needed at least on C8000 systems to get the ATI FireGL card
* working. On other systems we will currently not extend the lmmio space.
*/
static unsigned long
extend_lmmio_len(unsigned long start, unsigned long end, unsigned long lba_len)
{
struct resource *tmp;
pr_debug("LMMIO mismatch: PAT length = 0x%lx, MASK register = 0x%lx\n",
end - start, lba_len);
lba_len = min(lba_len+1, 256UL*1024*1024); /* limit to 256 MB */
pr_debug("LBA: lmmio_space [0x%lx-0x%lx] - original\n", start, end);
if (boot_cpu_data.cpu_type < mako) {
pr_info("LBA: Not a C8000 system - not extending LMMIO range.\n");
return end;
}
end += lba_len;
if (end < start) /* fix overflow */
end = -1ULL;
pr_debug("LBA: lmmio_space [0x%lx-0x%lx] - current\n", start, end);
/* first overlap */
for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
pr_debug("LBA: testing %pR\n", tmp);
if (tmp->start == start)
continue; /* ignore ourself */
if (tmp->end < start)
continue;
if (tmp->start > end)
continue;
if (end >= tmp->start)
end = tmp->start - 1;
}
pr_info("LBA: lmmio_space [0x%lx-0x%lx] - new\n", start, end);
/* return new end */
return end;
}
#else
#define truncate_pat_collision(r,n) (0)
#endif
@ -994,6 +1042,14 @@ lba_pat_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
case PAT_LMMIO:
/* used to fix up pre-initialized MEM BARs */
if (!lba_dev->hba.lmmio_space.flags) {
unsigned long lba_len;
lba_len = ~READ_REG32(lba_dev->hba.base_addr
+ LBA_LMMIO_MASK);
if ((p->end - p->start) != lba_len)
p->end = extend_lmmio_len(p->start,
p->end, lba_len);
sprintf(lba_dev->hba.lmmio_name,
"PCI%02x LMMIO",
(int)lba_dev->hba.bus_num.start);