linux-kernel - [ 45/95] viafb: fix IGA1 modesetting on VX900

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Date:	Fri, 09 Mar 2012 11:02:47 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [ 45/95] viafb: fix IGA1 modesetting on VX900

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Tobias Schandinat <FlorianSchandinat@....de>

commit e29206381a1436e0f47c0f5b9a23159a03c57715 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/video/via/hw.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/video/via/hw.c
+++ b/drivers/video/via/hw.c
@@ -1810,6 +1810,9 @@ 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));


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