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From: Daniel Thompson <daniel.thompson@linaro.org>
To: Daniel Vetter <daniel.vetter@ffwll.ch>,
	DRI Development <dri-devel@lists.freedesktop.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Lee Jones <lee.jones@linaro.org>,
	Jingoo Han <jingoohan1@gmail.com>,
	Meghana Madhyastha <meghana.madhyastha@gmail.com>,
	Daniel Vetter <daniel.vetter@intel.com>
Subject: Re: [PATCH 1/6] backlight: Nuke unused backlight.props.state states
Date: Wed, 17 Jan 2018 14:56:36 +0000	[thread overview]
Message-ID: <f13c6edb-c9c4-0bff-4c74-4b381b088359@linaro.org> (raw)
In-Reply-To: <20180117140159.27611-1-daniel.vetter@ffwll.ch>

On 17/01/18 14:01, Daniel Vetter wrote:
> The backlight power state handling is supremely confusing. We have:
> - props.power, using FB_BLANK_* defines
> - props.fb_blank, using the same, but deprecated int favour of
>    props.state
> - props.state, using the BL_CORE_* defines
> - and finally a bunch of backlight drivers treat brightness == 0 as
>    off. But of course not all of them.
> 
> This is way too much confusion to fix in a simple patch, but at least
> prevent more hilarity from spreading by removing the unused BL_CORE_*
> defines. I have no idea why exactly anyone would need that.
> 
> Wrt the ideal state, we really just want a boolean state. The 4 power
> saving states that the fbdev subsystem uses are overkill in todays hw
> (this was only relevant for VGA and similar analog circuits like
> TV-out), the new drm atomic modeset api simplified even the uapi to a
> simple bool. And there was never a valid technical reason to have the
> intermediate fbdev power states for backlights (those really only can
> be either off or on).
> 
> Cleanup motivated by Meghana's questions about all this.
> 
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Jingoo Han <jingoohan1@gmail.com>
> Cc: Meghana Madhyastha <meghana.madhyastha@gmail.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>

Daniel: Ack is info for Lee J, not to imply you should take it through
         one of your trees.


Daniel.

  parent reply	other threads:[~2018-01-17 14:56 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-17 14:01 Daniel Vetter
2018-01-17 14:01 ` [PATCH 2/6] backlight/generic-bl: remove DRIVER1 state Daniel Vetter
2018-01-17 14:36   ` Emil Velikov
2018-01-17 16:37     ` Daniel Thompson
2018-01-18 13:08       ` Emil Velikov
2018-01-17 16:44   ` Daniel Thompson
2018-01-17 17:13     ` Daniel Vetter
2018-01-18  9:20       ` Daniel Thompson
2018-01-17 14:01 ` [PATCH 3/6] backlight/pandora: Stop using BL_CORE_DRIVER1 Daniel Vetter
2018-01-17 16:47   ` Daniel Thompson
2018-01-17 21:38     ` Daniel Vetter
2018-01-18  9:42       ` Daniel Thompson
2018-01-17 14:01 ` [PATCH 4/6] staging/fbtft: " Daniel Vetter
2018-01-17 16:50   ` Daniel Thompson
2018-01-17 14:01 ` [PATCH 5/6] backlight: Also nuke BL_CORE_DRIVER1 Daniel Vetter
2018-01-17 16:51   ` Daniel Thompson
2018-01-17 14:01 ` [PATCH 6/6] MAINTAINERS: add dri-devel for backlight subsystem patches Daniel Vetter
2018-01-17 16:52   ` Daniel Thompson
2018-01-17 17:06     ` Jingoo Han
2018-01-17 14:56 ` Daniel Thompson [this message]
2018-01-18  8:32   ` [PATCH 1/6] backlight: Nuke unused backlight.props.state states Lee Jones
2018-04-25 17:42 Daniel Vetter
2018-04-25 19:42 ` Jingoo Han
2018-04-30 10:21 ` Jani Nikula
2018-04-30 12:27 ` Lee Jones

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