[PATCH] stifb: detect cards in double buffer mode more reliable

[Helge Deller <deller@gmx.de>]

stifb: detect cards in double buffer mode more reliable

Visualize-EG, Graffiti and A4450A graphics cards on PARISC can
be configured in double-buffer and standard mode, but the stifb
driver supports standard mode only.
This patch detects double-buffered cards more reliable.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/drivers/video/stifb.c b/drivers/video/stifb.c
index c97709e..3fe3be5 100644
--- a/drivers/video/stifb.c
+++ b/drivers/video/stifb.c
@@ -1100,13 +1100,18 @@ stifb_init_fb(struct sti_struct *sti, int bpp_pref)
 	/* only supported cards are allowed */
 	switch (fb->id) {
 	case CRT_ID_VISUALIZE_EG:
-		/* look for a double buffering device like e.g. the 
-		   "INTERNAL_EG_DX1024" in the RDI precisionbook laptop
-		   which won't work. The same device in non-double 
-		   buffering mode returns "INTERNAL_EG_X1024". */
-		if (strstr(sti->outptr.dev_name, "EG_DX")) {
-		   printk(KERN_WARNING 
-			"stifb: ignoring '%s'. Disable double buffering in IPL menu.\n",
+		/* Visualize cards can run either in "double buffer" or 
+ 		  "standard" mode. Depending on the mode, the card reports
+		  a different device name, e.g. "INTERNAL_EG_DX1024" in double
+		  buffer mode and "INTERNAL_EG_X1024" in standard mode.
+		  Since this driver only supports standard mode, we check
+		  if the device name contains the string "DX" and tell the
+		  user how to reconfigure the card. */
+		if (strstr(sti->outptr.dev_name, "DX")) {
+		   printk(KERN_WARNING "WARNING: stifb framebuffer driver does not "
+			"support '%s' in double-buffer mode.\n"
+			KERN_WARNING "WARNING: Please disable the double-buffer mode "
+			"in IPL menu (the PARISC-BIOS).\n",
 			sti->outptr.dev_name);
 		   goto out_err0;
 		}

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