From: Heiko Stuebner <heiko@sntech.de>
To: Mark Yao <mark.yao@rock-chips.com>,
        linux-arm-kernel@lists.infradead.org
Cc: David Airlie <airlied@linux.ie>, dri-devel@lists.freedesktop.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 1/7] drm/rockchip: vop: initialize registers directly
Date: Wed, 26 Jul 2017 00:36:48 +0200
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Hi Mark,

Am Donnerstag, 20. Juli 2017, 10:43:22 CEST schrieb Mark Yao:
> At present we are using init_table to initialize some
> registers, but the Register init table use un-document define,
> it is unreadable, and sometimes we only want to update tiny
> bits, init table method is not friendly, it's diffcult to
> reuse for difference chips.
> 
> To make it clean, initialize registers directly, and drops
> init_table mechanism out.
> 
> Changes in v3:
> - Explain more in details
> 
> Signed-off-by: Mark Yao <mark.yao@rock-chips.com>

[...]

> diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> index bafd698..00e9d79 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> @@ -127,13 +127,7 @@
>  	.cfg_done = VOP_REG(RK3036_REG_CFG_DONE, 0x1, 0),
>  };
>  
> -static const struct vop_reg_data rk3036_vop_init_reg_table[] = {
> -	{RK3036_DSP_CTRL1, 0x00000000},
> -};
> -
>  static const struct vop_data rk3036_vop = {
> -	.init_table = rk3036_vop_init_reg_table,
> -	.table_size = ARRAY_SIZE(rk3036_vop_init_reg_table),
>  	.ctrl = &rk3036_ctrl_data,
>  	.intr = &rk3036_intr,
>  	.win = rk3036_vop_win_data,

This seems to break vop initialization on my rk3036 kylin board.

Before, kylin was able to bring output to the hdmi but with this
patch applied this stops working. As the init-value is to zero it seems
there is still something turned on, that should be turned off instead.

rk3288 seems to stay in working condition though.


Heiko