Subject: Re: [PATCH] atyfb: force 29MHz xtal on G3 PowerBooks

From: Benjamin Herrenschmidt <[email-masked]>
Date: Wed, 19 Sep 2007 13:01:06 +1000

On Sat, 2007-08-25 at 11:13 +0200, Olaf Hering wrote:
> The atyfb does not work on my 233MHz PowerBook with Mach64 LP, when the
> kernel is booted from firmware. aty_ld_pll_ct() returns 0x22 and xtal
> remains at 14.31818. When booted from MacOS, aty_ld_pll_ct() returns 0x3c
> and xtal is changed to 29.498928.
> Google indicates that all 4 PowerBook models need the higher value.

Seems to break it on my wallstreet first gen (M64 LG)

So NAK for now until we find out a better way.

Ben.

> Signed-off-by: Olaf Hering <[email-masked]>
> 
> --- a/drivers/video/aty/atyfb_base.c
> +++ b/drivers/video/aty/atyfb_base.c
> @@ -2411,7 +2411,7 @@ static int __devinit aty_init(struct fb_
>  				diff1 = -diff1;
>  			if (diff2 < 0)
>  				diff2 = -diff2;
> -			if (diff2 < diff1) {
> +			if (diff2 < diff1 || (M64_HAS(G3_PB_1024x768))) {
>  				par->ref_clk_per = 1000000000000ULL / 29498928;
>  				xtal = "29.498928";
>  			}
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