linux-kernel - Re: Linux 2.6.37

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Date:	Thu, 6 Jan 2011 21:55:23 +0100
From:	Alex Riesen <raa.lkml@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: Linux 2.6.37

On Thu, Jan 6, 2011 at 18:49, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>
> My fear is that some machines have a dependency between the backlight
> and panel power status. The patch in question changed the timing between
> turning on the panel and adjusting the backlight which would be restore
> with:
>
> diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> index aa23070..0b40b4f 100644
> --- a/drivers/gpu/drm/i915/intel_lvds.c
> +++ b/drivers/gpu/drm/i915/intel_lvds.c
> @@ -106,6 +106,12 @@ static void intel_lvds_enable(struct intel_lvds *intel_lvds)
>        I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
>        POSTING_READ(lvds_reg);
>
> +       {
> +               u32 reg = HAS_PCH_SPLIT(dev) ? PCH_PP_STATUS : PPS_STATUS;
> +               if (wait_for(I915_READ(reg) & PP_ON, 1000))
> +                       DRM_ERROR("timed out waiting for panel to power up\n");
> +       }
> +
>        intel_panel_set_backlight(dev, dev_priv->backlight_level);
>  }

FWIW it does not compile:
  CC      drivers/gpu/drm/i915/intel_lvds.o
drivers/gpu/drm/i915/intel_lvds.c: In function ‘intel_lvds_enable’:
drivers/gpu/drm/i915/intel_lvds.c:110: error: ‘PPS_STATUS’ undeclared
(first use in this function)
drivers/gpu/drm/i915/intel_lvds.c:110: error: (Each undeclared
identifier is reported only once
drivers/gpu/drm/i915/intel_lvds.c:110: error: for each function it appears in.)
make[4]: *** [drivers/gpu/drm/i915/intel_lvds.o] Error 1
--
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