Commit 23aa4db7 authored by Ondrej Zary's avatar Ondrej Zary Committed by Tomi Valkeinen

tridentfb: Fix set_lwidth on TGUI9440 and CYBER9320

According to X.Org driver, chips older than TGUI9660 have only 1 width bit
in AddColReg. Touching the 2nd one causes I2C/DDC to fail on TGUI9440.

Set only 1 bit of width in AddColReg on TGUI9440 and CYBER9320.
Signed-off-by: default avatarOndrej Zary <linux@rainbow-software.org>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent 7f2ea957
......@@ -673,6 +673,12 @@ static int get_nativex(struct tridentfb_par *par)
static inline void set_lwidth(struct tridentfb_par *par, int width)
{
write3X4(par, VGA_CRTC_OFFSET, width & 0xFF);
/* chips older than TGUI9660 have only 1 width bit in AddColReg */
/* touching the other one breaks I2C/DDC */
if (par->chip_id == TGUI9440 || par->chip_id == CYBER9320)
write3X4(par, AddColReg,
(read3X4(par, AddColReg) & 0xEF) | ((width & 0x100) >> 4));
else
write3X4(par, AddColReg,
(read3X4(par, AddColReg) & 0xCF) | ((width & 0x300) >> 4));
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment