From: Robert Morell <rmorell@nvidia.com>
Date: Sat, 20 Nov 2010 02:55:51 +0000 (-0800)
Subject: video: tegra: Scale colors in pseudopalette
X-Git-Tag: firefly_0821_release~9833^2~103^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d340f9224dbf9be5d597c18222073c9d328b3473;p=firefly-linux-kernel-4.4.55.git

video: tegra: Scale colors in pseudopalette

This fixes incorrect colors drawn by clients such as fbconsole.  As
described by skeletonfb's fb_setcolreg: "The values supplied have a 16
bit magnitude which needs to be scaled in this function for the
hardware."

Tested with both r8g8b8 and r5g6b5 pixel depths and fbconsole.

Change-Id: Ie3c3579502ddab8843a8a4dc7049c6efaa5d0ac1
Signed-off-by: Robert Morell <rmorell@nvidia.com>
Acked-by: Erik Gilling <konkers@android.com>
---

diff --git a/drivers/video/tegra/fb.c b/drivers/video/tegra/fb.c
index 15a4f5b472a8..cc26c5977a20 100644
--- a/drivers/video/tegra/fb.c
+++ b/drivers/video/tegra/fb.c
@@ -198,6 +198,10 @@ static int tegra_fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 		if (regno >= 16)
 			return -EINVAL;
 
+		red = (red >> (16 - info->var.red.length));
+		green = (green >> (16 - info->var.green.length));
+		blue = (blue >> (16 - info->var.blue.length));
+
 		v = (red << var->red.offset) |
 			(green << var->green.offset) |
 			(blue << var->blue.offset);