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>

diff --git a/drivers/staging/xgifb/XGI_main_26.c b/drivers/staging/xgifb/XGI_main_26.c
index 98b8b09..f775c54 100644 (file)
--- 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;
        }