offb: Add palette hack for little endian

The pseudo palette color entries need to be ajusted for little endian. This patch byteswaps the values in the pseudo palette depending on the host endian order and the screen depth. Signed-off-by: Cédric Le Goater <[email protected]> Signed-off-by: Benjamin Herrenschmidt <[email protected]>
AnTAVR · Dec 10, 2013 · e1edf18 · e1edf18
1 parent 212c0cb
commit e1edf18
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/drivers/video/offb.c b/drivers/video/offb.c
@@ -91,6 +91,15 @@ extern boot_infos_t *boot_infos;
 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
 
+#define FB_RIGHT_POS(p, bpp)         (fb_be_math(p) ? 0 : (32 - (bpp)))
+
+static inline u32 offb_cmap_byteswap(struct fb_info *info, u32 value)
+{
+	u32 bpp = info->var.bits_per_pixel;
+
+	return cpu_to_be32(value) >> FB_RIGHT_POS(info, bpp);
+}
+
     /*
      *  Set a single color register. The values supplied are already
      *  rounded down to the hardware's capabilities (according to the
@@ -120,7 +129,7 @@ static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 			mask <<= info->var.transp.offset;
 			value |= mask;
 		}
-		pal[regno] = value;
+		pal[regno] = offb_cmap_byteswap(info, value);
 		return 0;
 	}