From: Chris Wilson <chris@chris-wilson.co.uk>
To: Takashi Iwai <tiwai@suse.de>, Adam Jackson <ajax@redhat.com>
Cc: intel-gfx@lists.freedesktop.org, hcb@chaoticmind.net
Subject: Re: Thinkpad T420 and single/dual channel lvds
Date: Thu, 15 Mar 2012 13:25:08 +0000 [thread overview]
Message-ID: <d08817$3homf2@azsmga001.ch.intel.com> (raw)
In-Reply-To: <s5hvcm6vwc5.wl%tiwai@suse.de>
On Thu, 15 Mar 2012 14:15:54 +0100, Takashi Iwai <tiwai@suse.de> wrote:
> +static bool is_dual_link_lvds(struct drm_i915_private *dev_priv)
> +{
> + /* BIOS should set the proper LVDS register value at boot, but
> + * in reality, it doesn't set the value when the lid is closed;
> + * thus when a machine is booted with the lid closed, the LVDS
> + * reg value can't be trusted. So we need to check "the value
> + * to be set" in VBT at first.
> + */
> + if ((dev_priv->bios_lvds_val & LVDS_CLKB_POWER_MASK) ==
> + LVDS_CLKB_POWER_UP)
> + return true;
> + if ((I915_READ(PCH_LVDS) & LVDS_CLKB_POWER_MASK) ==
This is either PCH_LVDS or LVDS depending on the generation.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
next prev parent reply other threads:[~2012-03-15 13:25 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-14 12:37 Thinkpad T420 and single/dual channel lvds Helge Bahmann
2012-03-14 14:45 ` Adam Jackson
2012-03-14 16:44 ` Takashi Iwai
2012-03-14 18:09 ` Adam Jackson
2012-03-15 13:15 ` Takashi Iwai
2012-03-15 13:25 ` Chris Wilson [this message]
2012-03-15 13:30 ` Takashi Iwai
2012-03-15 14:42 ` Takashi Iwai
2012-03-16 15:33 ` Rodrigo Vivi
2012-03-16 19:55 ` Adam Jackson
2012-03-16 20:29 ` Takashi Iwai
2012-03-18 17:50 ` Daniel Vetter
2012-03-18 18:01 ` Andreas Heider
2012-03-18 20:26 ` Takashi Iwai
2012-03-18 20:24 ` Takashi Iwai
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