[PATCH 1/6] atyfb: Add boot/module option to override composite sync

["Antonino A. Daplas" <adaplas@hotpop.com>]

  Some SPARC-based displays need the composite sync set to high.
  Since none of the entries in the default db has the composite
  sync set to high, using fb_find_mode() will produce a blank
  display.

  Add this new option to Documentation/fb/aty128fb.txt

Signed-off-by: Antonino Daplas <adaplas@pol.net>
---

Documentation/fb/aty128fb.txt  |    1 +
 drivers/video/aty/atyfb_base.c |   13 +++++++++++++
 2 files changed, 14 insertions(+)

diff -Nru a/Documentation/fb/aty128fb.txt b/Documentation/fb/aty128fb.txt
--- a/Documentation/fb/aty128fb.txt	2005-03-12 22:23:57 +08:00
+++ b/Documentation/fb/aty128fb.txt	2005-03-13 07:35:30 +08:00
@@ -54,6 +54,7 @@
 
 noaccel  - do not use acceleration engine. It is default.
 accel    - use acceleration engine. Not finished.
+comp_sync- set composite sync, 0 for low, 1 for high.
 vmode:x  - chooses PowerMacintosh video mode <x>. Depreciated.
 cmode:x  - chooses PowerMacintosh colour mode <x>. Depreciated.
 <XxX@X>  - selects startup videomode. See modedb.txt for detailed
diff -Nru a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
--- a/drivers/video/aty/atyfb_base.c	2005-03-12 23:23:49 +08:00
+++ b/drivers/video/aty/atyfb_base.c	2005-03-13 07:35:31 +08:00
@@ -307,6 +307,7 @@
 static int pll;
 static int mclk;
 static int xclk;
+static int comp_sync __initdata = -1;
 static char *mode;
 
 #ifdef CONFIG_PPC
@@ -2527,6 +2528,13 @@
 	else
 		var.accel_flags |= FB_ACCELF_TEXT;
 
+	if (comp_sync != -1) {
+		if (!comp_sync)
+			var.sync &= ~FB_SYNC_COMP_HIGH_ACT;
+		else
+			var.sync |= FB_SYNC_COMP_HIGH_ACT;
+	}
+
 	if (var.yres == var.yres_virtual) {
 		u32 videoram = (info->fix.smem_len - (PAGE_SIZE << 2));
 		var.yres_virtual = ((videoram * 8) / var.bits_per_pixel) / var.xres_virtual;
@@ -3612,6 +3620,8 @@
 			mclk = simple_strtoul(this_opt + 5, NULL, 0);
 		else if (!strncmp(this_opt, "xclk:", 5))
 			xclk = simple_strtoul(this_opt+5, NULL, 0);
+		else if (!strncmp(this_opt, "comp_sync:", 10))
+			comp_sync = simple_strtoul(this_opt+10, NULL, 0);
 #ifdef CONFIG_PPC
 		else if (!strncmp(this_opt, "vmode:", 6)) {
 			unsigned int vmode =
@@ -3701,6 +3711,9 @@
 MODULE_PARM_DESC(mclk, "int: override memory clock");
 module_param(xclk, int, 0);
 MODULE_PARM_DESC(xclk, "int: override accelerated engine clock");
+module_param(comp_sync, int, 0);
+MODULE_PARM_DESC(comp_sync,
+		 "Set composite sync signal to low (0) or high (1)");
 module_param(mode, charp, 0);
 MODULE_PARM_DESC(mode, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
 #ifdef CONFIG_MTRR




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