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From: Vasily Khoruzhick <anarsoul@gmail.com>
To: Jesse Barnes <jbarnes@virtuousgeek.org>
Subject: Re: [Intel-gfx] Interrupt latency on some 945GM platforms
Date: Wed, 22 Sep 2010 08:57:30 +0300
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Cc: Paolo Ornati <ornati@gmail.com>,
        Simon Farnsworth <simon.farnsworth@onelan.co.uk>,
        intel-gfx@lists.freedesktop.org, Sitsofe Wheeler <sitsofe@yahoo.com>,
        Venkatesh Pallipadi <venki@google.com>,
        Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
References: <201009132336.17310.anarsoul@gmail.com> <20100921202607.2b46ffca@gmail.com> <20100921155653.440afea4@jbarnes-desktop>
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On 22 of September 2010 01:56:53 Jesse Barnes wrote:
 
> Can you guys try something like this?  My theory is that 945GM has some
> power management behavior we're failing to configure correctly.  If
> disabling it works, then it's likely related.

Nope, it doesn't help, sorry

> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_d index 40cc5da..26e1d23 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5786,6 +5786,10 @@ void intel_init_clock_gating(struct drm_device *dev)
>                                    I915_READ(MCHBAR_RENDER_STANDBY) &
> ~RCX_SW_EX }
>         }
> +
> +
> +       /* Disable power management on 945GM */
> +       I915_WRITE(0x10f10, 0);
>  }
> 
>  /* Set up chip specific display functions */