diff options
| author | Ondrej Zary <linux@rainbow-software.org> | 2015-08-24 22:37:26 +0300 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2015-09-24 14:35:37 +0300 |
| commit | 23aa4db78aa7da994ae12d85acf7413ba2517946 (patch) | |
| tree | a412061df26ac7a76f0a15446430bda8c5eda13a /drivers/video | |
| parent | 7f2ea957c1152a7b57c22af2ae603bf66965c06e (diff) | |
| download | linux-23aa4db78aa7da994ae12d85acf7413ba2517946.tar.xz | |
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>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/tridentfb.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/video/fbdev/tridentfb.c b/drivers/video/fbdev/tridentfb.c index 742971304717..01b43e9ce941 100644 --- a/drivers/video/fbdev/tridentfb.c +++ b/drivers/video/fbdev/tridentfb.c @@ -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 */ |