On embedded systems without a BIOS, the DRAM sizing register is 0 after
the boot, and the driver thinks we have only 1 MB video memory. On such
cases, use the PCI window size for the initial size. This information
is needed only to create the I/O mapping - the driver will later detect
and configure the memory size correctly. Limit the size to 16 MB as it
should be sufficient for all supported video modes.
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
---
drivers/staging/xgifb/XGI_main_26.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/xgifb/XGI_main_26.c b/drivers/staging/xgifb/XGI_main_26.c
index 98b8b09..f775c54 100644
--- a/drivers/staging/xgifb/XGI_main_26.c
+++ b/drivers/staging/xgifb/XGI_main_26.c
@@ -6,6 +6,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/sizes.h>
#include <linux/module.h>
#ifdef CONFIG_MTRR
@@ -1470,6 +1471,9 @@ static int XGIfb_get_dram_size(struct xgifb_video_info *xgifb_info)
xgifb_reg_set(XGISR, IND_SIS_DRAM_SIZE, 0x51);
reg = xgifb_reg_get(XGISR, IND_SIS_DRAM_SIZE);
+ if (!reg)
+ return -1;
+
switch ((reg & XGI_DRAM_SIZE_MASK) >> 4) {
case XGI_DRAM_SIZE_1MB:
xgifb_info->video_size = 0x100000;
@@ -1778,10 +1782,8 @@ static int __devinit xgifb_probe(struct pci_dev *pdev,
hw_info->jChipType = xgifb_info->chip;
if (XGIfb_get_dram_size(xgifb_info)) {
- dev_err(&pdev->dev,
- "Fatal error: Unable to determine RAM size.\n");
- ret = -ENODEV;
- goto error_disable;
+ xgifb_info->video_size = min_t(unsigned long, video_size_max,
+ SZ_16M);
} else if (xgifb_info->video_size > video_size_max) {
xgifb_info->video_size = video_size_max;
}
--
1.7.2.5
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