linux-kernel - [PATCH 4/5] viafb: fix IGA1 modesetting on VX900

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Message-Id: <43951de17c7a84280f3fbfb10d681ee73149a96e.1329936280.git.FlorianSchandinat@gmx.de>
Date:	Wed, 22 Feb 2012 18:53:08 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	linux-fbdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	stable@...r.kernel.org
Subject: [PATCH 4/5] viafb: fix IGA1 modesetting on VX900

Even if the documentation calls this bit "Reserved" it has to be set
to 0 for correct modesetting on IGA1.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@....de>
Cc: stable@...r.kernel.org
---
 drivers/video/via/hw.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/video/via/hw.c b/drivers/video/via/hw.c
index e6e7a8f..376af05 100644
--- a/drivers/video/via/hw.c
+++ b/drivers/video/via/hw.c
@@ -1804,6 +1804,9 @@ static void hw_init(void)
 		break;
 	}
 
+	/* magic required on VX900 for correct modesetting on IGA1 */
+	via_write_reg_mask(VIACR, 0x45, 0x00, 0x01);
+
 	/* probably this should go to the scaling code one day */
 	via_write_reg_mask(VIACR, 0xFD, 0, 0x80); /* VX900 hw scale on IGA2 */
 	viafb_write_regx(scaling_parameters, ARRAY_SIZE(scaling_parameters));
-- 
1.7.9

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