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@gmx.de>
Cc: stable@vger.kernel.org
diff --git a/drivers/video/via/hw.c b/drivers/video/via/hw.c
index 8bdf80e..8497727 100644
--- a/drivers/video/via/hw.c
+++ b/drivers/video/via/hw.c
@@ -1810,6 +1810,9 @@
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));