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SubjectPatch: sstfb support for interlace / doublescan modes.
Hi everyone!

This patch adds support for interlace and doublescan modes to the sstfb
(voodoo 1 /2) framebuffer driver.

I have been trying to get in touch with this driver's maintainer
(Ghozlane Toumi) for quite some time now, but I won't get any replies,
neither from the eMail-address supplied in the kernel source, nor from
another one that I found on the web. Does anybody know how he is
reachable now?

Sincerely,
Urs Ganse
--
Urs Ganse
ursg@uni.de
______________________________________________________FIDO: 2:2432/700.2
--- linux/drivers/video/sstfb.c Sat Dec 22 18:26:16 2001
+++ linux/drivers/video/sstfb.c Tue Feb 26 14:23:05 2002
@@ -5,12 +5,16 @@
*
* Created 15 Jan 2000 by Ghozlane Toumi
*
+ * NOTE: I have been unable to reach Ghozlane through the eMail-address
+ * given above for more than 3 months, same with another address of him
+ * which I found on the web. - Urs
+ *
* Contributions (and many thanks) :
*
* 03/2001 James Simmons <jsimmons@linux-fbdev.org>
* 04/2001 Paul Mundt <lethal@chaoticdreams.org>
- * 05/2001 Urs Ganse <urs.ganse@t-online.de>
- * (initial work on voodoo2 port)
+ * 05/2001 Urs Ganse <ursg@uni.de>
+ * (initial work on voodoo2 port, added interlace support)
*
*
* $Id: sstfb.c,v 1.26.4.1 2001/08/29 01:30:37 ghoz Exp $
@@ -59,6 +63,8 @@
-TODO: change struct sst_info fb_info from static to array/dynamic
TTT comments is for code i've put there for debuging the "weird peinguin
syndrome", it should disapear soon
+-FIXME: Some uninitialized variable causes sporadic crashes when setting a video
+ mode for the first time.

*
*/
@@ -208,7 +214,7 @@

/********/

-/* Interface to ze oueurld */
+/* Interface to the world */
int sstfb_init(void);
int sstfb_setup(char *options);

@@ -599,9 +605,8 @@
var->xres, var->yres);
return -EINVAL;
}
- if ((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED) {
- eprintk("Interlace non supported %#x\n",
- (var->vmode & FB_VMODE_MASK));
+ if((var->vmode & FB_VMODE_MASK) && !sst_info->is_voodoo2 ){
+ eprintk ("Interlace modes not supported on Voodoo 1 hardware.\n");
return -EINVAL;
}

@@ -615,7 +620,17 @@
par->vSyncOn = var->vsync_len;
par->vSyncOff = var->yres + var->lower_margin + var->upper_margin;
par->vBackPorch = var->upper_margin;
-
+
+ par->flags = 0;
+ if (var->vmode & FB_VMODE_INTERLACED) {
+// printk(KERN_DEBUG "sstfb: This is an interlace mode.\n");
+ par->flags|=FB_VMODE_INTERLACED;
+ }
+ if(var->vmode & FB_VMODE_DOUBLE) {
+// printk(KERN_DEBUG "sstfb: This is a doublescan mode.\n");
+ par->flags|=FB_VMODE_DOUBLE;
+ }
+
switch (var->bits_per_pixel) {
case 0 ... 16 :
par->bpp = 16;
@@ -685,7 +700,7 @@
var->lower_margin = par->vSyncOff - par->yDim - par->vBackPorch;
var->hsync_len = par->hSyncOn;
var->vsync_len = par->vSyncOn;
- var->vmode = FB_VMODE_NONINTERLACED;
+ var->vmode = par->flags;

/*
* correct the color bit fields
@@ -1375,6 +1390,17 @@
sst_write(HSYNC, (par->hSyncOff-1) << 16 | (par->hSyncOn-1));
sst_write(VSYNC, par->vSyncOff << 16 | par->vSyncOn);

+ /* Interlace or Doublescan */
+ if(par->flags & FB_VMODE_INTERLACED)
+ sst_set_bits(FBIINIT5,1>>26);
+ else
+ sst_unset_bits(FBIINIT5,1>>26);
+
+ if(par->flags & FB_VMODE_DOUBLE)
+ sst_set_bits(FBIINIT5,1>>20);
+ else
+ sst_unset_bits(FBIINIT5,1>>20);
+
fbiinit2=sst_read(FBIINIT2);
fbiinit3=sst_read(FBIINIT3);

--- linux/drivers/video/sstfb.h Sat Dec 22 18:26:21 2001
+++ linux/drivers/video/sstfb.h Tue Feb 26 13:16:01 2002
@@ -317,6 +317,7 @@
unsigned int vSyncOn;
unsigned int vSyncOff;
unsigned int vBackPorch;
+ unsigned int flags; /* Doublescan, Interlace etc. */
unsigned int freq; /* freq in picoseconds */
unsigned int tiles_in_X; /* num of tiles in X res */
};
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