Staging: udlfb: remove printk and small cleanup

Remove last remaining printk and clarify comments
Signed-off-by: Bernie Thompson <bernie@plugable.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/udlfb/udlfb.c

@@ -83,8 +83,8 @@ static struct fb_deferred_io dlfb_defio;
 #endif
 
 /*
- * Inserts a specific DisplayLink controller command into the provided
- * buffer.
+ * All DisplayLink bulk operations start with 0xAF, followed by specific code
+ * All operations are written to buffers which then later get sent to device
  */
 static char *dlfb_set_register(char *buf, u8 reg, u8 val)
 {
@@ -129,6 +129,10 @@ static char *dlfb_set_base16bpp(char *wrptr, u32 base)
 	return dlfb_set_register(wrptr, 0x22, base);
 }
 
+/*
+ * DisplayLink HW has separate 16bpp and 8bpp framebuffers.
+ * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer
+ */
 static char *dlfb_set_base8bpp(char *wrptr, u32 base)
 {
 	wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);
@@ -161,7 +165,7 @@ static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)
  * same actual count. This makes sense once you read above a couple of
  * times and think about it from a hardware perspective.
  */
-static u16 lfsr16(u16 actual_count)
+static u16 dlfb_lfsr16(u16 actual_count)
 {
 	u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */
 
@@ -180,7 +184,7 @@ static u16 lfsr16(u16 actual_count)
  */
 static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)
 {
-	return dlfb_set_register_16(wrptr, reg, lfsr16(value));
+	return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));
 }
 
 /*
@@ -292,8 +296,9 @@ static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
 	unsigned long size = vma->vm_end - vma->vm_start;
 	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 	unsigned long page, pos;
+	struct dlfb_data *dev = info->par;
 
-	printk("MMAP: %lu %u\n", offset + size, info->fix.smem_len);
+	dl_notice("MMAP: %lu %u\n", offset + size, info->fix.smem_len);
 
 	if (offset + size > info->fix.smem_len)
 		return -EINVAL;