linux-kernel - Re: [PATCH v2 05/10] drm/rockchip: analogix

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Date:	Wed, 25 May 2016 13:55:11 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Heiko Stuebner <heiko@...ech.de>
Cc:	David Airlie <airlied@...ux.ie>, Inki Dae <inki.dae@...sung.com>,
	Mark Yao <yzq@...k-chips.com>,
	Thierry Reding <treding@...dia.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Douglas Anderson <dianders@...omium.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Javier Martinez Canillas <javier@....samsung.com>,
	emil.l.velikov@...il.com, Dan Carpenter <dan.carpenter@...cle.com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v2 05/10] drm/rockchip: analogix_dp: add rk3399 eDP
 support



On 05/24/2016 06:17 PM, Heiko Stuebner wrote:
> Am Dienstag, 24. Mai 2016, 14:57:23 schrieb Yakir Yang:
> [........]
>> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c index 29c4105..d5d4e04
>> 100644
>> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
>> @@ -148,6 +148,10 @@ rockchip_dp_drm_encoder_atomic_check(struct
>> drm_encoder *encoder, struct drm_connector_state *conn_state)
>>   {
>>   	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
>> +	struct rockchip_dp_device *dp = to_dp(encoder);
>> +	int ret;
>> +
>> +	s->output_type = DRM_MODE_CONNECTOR_eDP;
>>
>>   	/*
>>   	 * FIXME(Yakir): driver should configure the CRTC output video
>> @@ -162,8 +166,27 @@ rockchip_dp_drm_encoder_atomic_check(struct
>> drm_encoder *encoder, * But if I configure CTRC to RGBaaa, and eDP driver
>> still keep * RGB666 input video mode, then screen would works prefect.
>>   	 */
>> -	s->output_mode = ROCKCHIP_OUT_MODE_AAAA;
>> -	s->output_type = DRM_MODE_CONNECTOR_eDP;
>> +
>> +	ret = drm_of_encoder_active_endpoint_id(dp->dev->of_node, encoder);
>> +	if (ret < 0)
>> +		return;
> this needs a value returned (probably ret), otherwise you create a
> warning: ‘return’ with no value, in function returning non-void
Done,

Thanks,
- Yakir
>
> drm_of_encoder_active_endpoint_id also always returns -EINVAL on rk3288-
> veyron-jerry because encoder->crtc is unset in
> drm_of_encoder_active_endpoint and that breaks display output right now.
>
> Looking through drm code it seems only two functions would set encoder->crtc
> - drm_atomic_helper_update_legacy_modeset_state
> - drm_crtc_helper_set_config
>
> drm_crtc_helper_set_config callback got dropped in the atomic-conversion and
> the other sounds to be somewhat in the legacy area.
>
> After that drm-internals get a bit confusing.
>
>
> Heiko
>
>
>