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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: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Ondrej Zary 2015-08-24 21:37:26 +02:00 committed by Tomi Valkeinen
parent 7f2ea957c1
commit 23aa4db78a
1 changed files with 8 additions and 2 deletions
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10
drivers/video/fbdev/tridentfb.c
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@ -673,8 +673,14 @@ 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);
write3X4(par, AddColReg,
(read3X4(par, AddColReg) & 0xCF) | ((width & 0x300) >> 4));
/* 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));
}
/* For resolutions smaller than FP resolution stretch */