linux-kernel - [PATCH 04/10] video: fbdev: atari: Fix ext

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Date:   Mon, 11 Jul 2022 17:50:28 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Helge Deller <deller@....de>
Cc:     Michael Schmitz <schmitzmic@...il.com>,
        Jonathan Corbet <corbet@....net>, linux-fbdev@...r.kernel.org,
        linux-doc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 04/10] video: fbdev: atari: Fix ext_setcolreg()

The red, green, and blue color values are 16-bit, while the external
graphics hardware registers are 8-bit.
Add the missing conversion from 16-bit to 8-bit.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
Untested due to lack of hardware.
---
 drivers/video/fbdev/atafb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/video/fbdev/atafb.c b/drivers/video/fbdev/atafb.c
index 39c3b860a797d4bc..a36cd8f1f4200dd5 100644
--- a/drivers/video/fbdev/atafb.c
+++ b/drivers/video/fbdev/atafb.c
@@ -2206,6 +2206,10 @@ static int ext_setcolreg(unsigned int regno, unsigned int red,
 	if (regno > 255)
 		return 1;
 
+	red >>= 8;
+	green >>= 8;
+	blue >>= 8;
+
 	switch (external_card_type) {
 	case IS_VGA:
 		OUTB(0x3c8, regno);
-- 
2.25.1