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SubjectRe: [patch 07/41] fbdev/atyfb: Fix DSP config on some PowerMacs & PowerBooks
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On Wed, 2009-02-04 at 10:46 -0800, Greg KH wrote:
> plain text document attachment
> (fbdev-atyfb-fix-dsp-config-on-some-powermacs-powerbooks.patch)
> 2.6.27-stable review patch. If anyone has any objections, please let us know.

My only possible worry with that one is the first generation clamshell
iBook which uses a Mobility M1 chip, for which we haven't had anybody
testing whether this would break it or not ...

So if anybody with such a machine is reading this, please holler...

Cheers,
Ben.

> ------------------
>
> From: Risto Suominen <Risto.Suominen@gmail.com>
>
> commit 7fbb7cadd062baf299fd8b26a80ea99da0c3fe01 upstream.
>
> Since the complete re-write in 2.6.10, some PowerMacs (At least PowerMac 5500
> and PowerMac G3 Beige rev A) with ATI Mach64 chip have suffered from unstable
> columns in their framebuffer image. This seems to depend on a value (4) read
> from PLL_EXT_CNTL register, which leads to incorrect DSP config parameters to
> be written to the chip. This patch uses a value calculated by aty_init_pll_ct
> instead, as a starting point.
>
> There are questions as to whether this should be extended to other platforms
> or maybe made dependent on specific chip types, but in the meantime, this has
> been tested on various powermacs and works for them so let's commit it.
>
> Signed-off-by: Risto Suominen <Risto.Suominen@gmail.com>
> Tested-by: Michael Pettersson <mike@it.uu.se>
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
>
> ---
> drivers/video/aty/mach64_ct.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> --- a/drivers/video/aty/mach64_ct.c
> +++ b/drivers/video/aty/mach64_ct.c
> @@ -8,6 +8,9 @@
> #include <asm/io.h>
> #include <video/mach64.h>
> #include "atyfb.h"
> +#ifdef CONFIG_PPC
> +#include <asm/machdep.h>
> +#endif
>
> #undef DEBUG
>
> @@ -536,6 +539,14 @@ static int __devinit aty_init_pll_ct(con
> pll->ct.xclk_post_div_real = postdividers[xpost_div];
> pll->ct.mclk_fb_div = q * pll->ct.xclk_post_div_real / 8;
>
> +#ifdef CONFIG_PPC
> + if (machine_is(powermac)) {
> + /* Override PLL_EXT_CNTL & 0x07. */
> + pll->ct.xclk_post_div = xpost_div;
> + pll->ct.xclk_ref_div = 1;
> + }
> +#endif
> +
> #ifdef DEBUG
> pllmclk = (1000000 * pll->ct.mclk_fb_mult * pll->ct.mclk_fb_div) /
> (par->ref_clk_per * pll->ct.pll_ref_div);
>
> --
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