linux-kernel - Re: [PATCH v2 5/5] drm/rockchip: default enable win2/3 area0 bit

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Date:	Fri, 03 Jul 2015 16:19:11 +0800
From:	Mark yao <mark.yao@...k-chips.com>
To:	Tomasz Figa <tfiga@...omium.org>
CC:	dri-devel <dri-devel@...ts.freedesktop.org>,
	David Airlie <airlied@...ux.ie>,
	Heiko Stuebner <heiko@...ech.de>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Daniel Vetter <daniel@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	sandy.huang@...k-chips.com, dkm@...k-chips.com, zwl@...k-chips.com,
	xw@...k-chips.com
Subject: Re: [PATCH v2 5/5] drm/rockchip: default enable win2/3 area0 bit

On 2015年07月03日 16:02, Tomasz Figa wrote:
> Hi Mark,
>
> Please see my comments inline.
>
> On Fri, Jun 26, 2015 at 7:10 PM, Mark Yao <mark.yao@...k-chips.com> wrote:
>> Win2/3 support 4 area display, but now havn't found a suitable
>> way to use it, and it enable by win gate and area gate,
>> so default enable area0 gate, so that its behaviour just like a
>> win.
> So I assume this means that currently, without those bits set, win2
> and win3 do not work? This would make this patch a fix maybe even with
> a potential backportability.

Yes, without this patch, all win2/3 area gate default disabled.
vop_update_plane_event call win enable only enable the win gate.

>
>> Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
>> ---
>> Changes in v2: None
>>
>>   drivers/gpu/drm/rockchip/rockchip_drm_vop.c |    6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> index 40107bb..e001d26 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> @@ -337,6 +337,12 @@ static const struct vop_reg_data vop_init_reg_table[] = {
>>          {DSP_CTRL0, 0x00000000},
>>          {WIN0_CTRL0, 0x00000080},
>>          {WIN1_CTRL0, 0x00000080},
>> +       /*
>> +        * Todo: win2/3 support area func, but now havn't found a suitable
>> +        * way to use it, so default enable area0 as a win display.
> TODO: Win2/3 support multiple area function, but we haven't found
> a suitable way to use it yet, so let's just use them as other windows
> with only area 0 enabled.
>
>> +        */
>> +       {WIN2_CTRL0, 0x00000010},
>> +       {WIN3_CTRL0, 0x00000010},
> Anyway, is it enough to program those registers one time in
> vop_initial()? Won't they get cleared when VOP is power cycled, e.g.
> in case of DPMS off and on? Maybe instead this could be done in
> vop_update_plane_event() for windows that need it?
There are two gate for Win2/3,
at VOP_WIN3_CTRL0:
         bit[0], "win3_en"
             this gating all the area.

         bit[4], win3_mst0_en
         bit[5], win3_mst1_en
         bit[6], win3_mst2_en
         bit[7], win3_mst3_en
             those gate each area.

This patch default enable win3_mst0_en, so control bit[0]"win3_en" that 
cat power on/off this window.

vop_update_plane_event()/ vop_disable_plane() only can control bit[0]"win3_en".


So this patch is enough to enable window2/3 area 0.


> Best regards,
> Tomasz

-- 
Ｍark


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