[PATCH] atmel_lcdfb: Use spare bits in 32bpp mode as alpha channel

[PATCH] atmel_lcdfb: Use spare bits in 32bpp mode as alpha channel

[Nicolas Ferre]

From: Haavard Skinnemoen <hskinnemoen@atmel.com>

Set var->transp.offset and var->transp.length in 32bpp mode to
indicate that the 8 otherwise unused bits can be used for
transparency.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
---
  drivers/video/atmel_lcdfb.c |    5 ++++-
  1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index a05491f..bb361ab 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -221,8 +221,11 @@ static int atmel_lcdfb_check_var(struct 
fb_var_screeninfo *var,
  		var->blue.offset = 10;
  		var->red.length = var->green.length = var->blue.length = 5;
  		break;
-	case 24:
  	case 32:
+		var->transp.offset = 24;
+		var->transp.length = 8;
+		/* fall through */
+	case 24:
  		var->red.offset = 0;
  		var->green.offset = 8;
  		var->blue.offset = 16;