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authorOndrej Zary <linux@rainbow-software.org>2015-08-24 21:37:26 +0200
committerTomi Valkeinen <tomi.valkeinen@ti.com>2015-09-24 14:35:37 +0300
commit23aa4db78aa7da994ae12d85acf7413ba2517946 (patch)
treea412061df26ac7a76f0a15446430bda8c5eda13a /drivers/video/fbdev/tridentfb.c
parent7f2ea957c1152a7b57c22af2ae603bf66965c06e (diff)
downloadlinux-23aa4db78aa7da994ae12d85acf7413ba2517946.tar.bz2
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/fbdev/tridentfb.c')
-rw-r--r--drivers/video/fbdev/tridentfb.c10
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 */