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staging: xgifb: setup initial video RAM size for systems without BIOS 

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@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aaro Koskinen 2012-09-13 00:45:42 +03:00 committed by Greg Kroah-Hartman
parent 1839c7ebd9
commit 98f4eade14
1 changed files with 6 additions and 4 deletions
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10
drivers/staging/xgifb/XGI_main_26.c
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@ -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;
}