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igfx: maintain single/double-channel LVDS mode from BIOS

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Michael Forney 2022-03-02 10:26:36 +00:00 committed by cinap_lenrek
parent 79c7e4514d
commit a00957efee
1 changed files with 6 additions and 1 deletions
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7
sys/src/cmd/aux/vga/igfx.c
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@ -850,7 +850,12 @@ initdpll(Igfx *igfx, int x, int freq, int port)
dpll->ctrl.v &= ~(3<<24);
if(port == PortLCD){
p2 = 14;
if(freq > 112*MHz){
/*
* Use dual-channel LVDS if the display clock is
* outside the range of single-channel, or it was
* preconfigured by the BIOS.
*/
if(freq > 112*MHz || (igfx->lvds.v>>4 & 3) == 3){
p2 >>= 1;
dpll->ctrl.v |= (1<<24);
}