linux-kernel - Re: [PATCH] drm/rockchip: get rid of rockchip_drm_crtc_mode

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Date:	Tue, 19 Apr 2016 10:43:03 +0800
From:	Mark yao <mark.yao@...k-chips.com>
To:	John Keeping <john@...anate.com>
CC:	David Airlie <airlied@...ux.ie>, Heiko Stuebner <heiko@...ech.de>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/rockchip: get rid of rockchip_drm_crtc_mode_config

On 2016年04月18日 17:25, John Keeping wrote:
> On Mon, 18 Apr 2016 11:03:31 +0800, Mark Yao wrote:
>
>> >We need to take care of the vop status when use
>> >rockchip_drm_crtc_mode_config, if vop is disabled,
>> >the function would failed, that is terrible.
>> >
>> >Save connector type and output mode on drm_display_mode->private_flags
>> >at encoder mode_fixup, then we can configure the type and mode safely
>> >on crtc mode_set.
> Since Rockchip is atomic, shouldn't this be using atomic_check hooks and
> a subclassed crtc_state structure?
>
Hi John

I try to use atomic_check with crtc_state, but it seems not easy,
there are two value need transmit from connector to vop: connector type 
and out_mode

the connector type I think we can loop the atomic state to find the 
connector type.
but the out_mode is a custom value, I can't find a generic way to 
transmit it with atomic state.

BTW, I think on atomic side, the drm_display_mode is under control by 
atomic state,
and the mode->private_flags is not use by drm framework, I found i915 
and gma500 also use
mode->private_flags to transmit custom value.

So I think it's no problem using mode->private_flags.

-- 
Ｍark Yao