From: "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.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Acked-by: Alexander Kern <alex.kern@gmx.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/drivers/video/aty/atyfb_base.c | 13 +++++++++++++
1 files changed, 13 insertions(+)
diff -puN drivers/video/aty/atyfb_base.c~atyfb-add-boot-module-option-to-override-composite-sync drivers/video/aty/atyfb_base.c
--- 25/drivers/video/aty/atyfb_base.c~atyfb-add-boot-module-option-to-override-composite-sync Mon Mar 14 15:23:44 2005
+++ 25-akpm/drivers/video/aty/atyfb_base.c Mon Mar 14 15:23:44 2005
@@ -307,6 +307,7 @@ static int vram;
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 @@ static int __init aty_init(struct fb_inf
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 @@ static int __init atyfb_setup(char *opti
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_param(mclk, int, 0);
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
_