linux-kernel - Re: [PATCH 4/7] drm/i915: Let panel power sequencing hardware do its job

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Date:	Wed, 02 Nov 2011 00:31:40 -0700
From:	Keith Packard <keithp@...thp.com>
To:	intel-gfx@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 4/7] drm/i915: Let panel power sequencing hardware do its job

On Tue,  1 Nov 2011 23:20:27 -0700, Keith Packard <keithp@...thp.com> wrote:

> -static void ironlake_wait_panel_off(struct intel_dp *intel_dp)
> +#define IDLE_ON_MASK		(PP_ON | PP_READY | PP_SEQUENCE_MASK | 0                     | PP_SEQUENCE_STATE_MASK)
> +#define IDLE_ON_VALUE   	(PP_ON | PP_READY | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_ON_IDLE)

A bit more testing -- looks like the MacBook Air doesn't mange to get
PP_READY set when it's time to turn the panel on. I should look at this
a bit more closely; there's no reason it shouldn't be set. But, nothing
bad seems to happen if we simply ignore the PP_READY bit

+#define IDLE_ON_MASK		(PP_ON | 0      | PP_SEQUENCE_MASK | 0                     | PP_SEQUENCE_STATE_MASK)
+#define IDLE_ON_VALUE   	(PP_ON | 0      | PP_SEQUENCE_NONE | 0                     | PP_SEQUENCE_STATE_ON_IDLE)

-- 
keith.packard@...el.com

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