tridentfb: fix hang on Blade3D with CONFIG_CC_OPTIMIZE_FOR_SIZE

When the kernel is compiled with -Os (CONFIG_CC_OPTIMIZE_FOR_SIZE), tridentfb hangs the machine upon load with Blade3D cards unless acceleration is disabled.

This is caused by memcpy() which copies data byte-by-byte (rep movsb) when compiled with -Os. The card does not like that - it requires 32-bit access.

Use iowrite_32() instead.

---
 drivers/video/fbdev/tridentfb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 7ed9a22..7429713 100644
@@ -226,7 +226,7 @@ static void blade_image_blit(struct tridentfb_par *par, const char *data,
 	writemmr(par, DST1, point(x, y));
 	writemmr(par, DST2, point(x + w - 1, y + h - 1));
 
-	memcpy(par->io_virt + 0x10000, data, 4 * size);
+	iowrite32_rep(par->io_virt + 0x10000, data, size);
 }
 
 static void blade_copy_rect(struct tridentfb_par *par,

Ondrej Zary