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authorHelge Deller <deller@gmx.de>2013-06-18 23:21:25 +0200
committerHelge Deller <deller@gmx.de>2013-07-09 22:09:16 +0200
commitdac76f1be5beaea4af9afe85fb475c73de0b8731 (patch)
tree83112c5476a2c021a76818c172545107ac93fd03 /drivers/parisc
parentd2b4a646717153a1a180b64d4a8464054dbd700e (diff)
parisc: fix LMMIO mismatch between PAT length and MASK register
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
Diffstat (limited to 'drivers/parisc')
-rw-r--r--drivers/parisc/lba_pci.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
index 1f05913ae677..19f6f70c67d3 100644
--- a/drivers/parisc/lba_pci.c
+++ b/drivers/parisc/lba_pci.c
@@ -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);

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