linux-kernel - Re: [PATCH 4/7] drm/exynos/hdmi: add bridge support

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Date:   Wed, 01 Feb 2017 16:44:27 +0900
From:   Inki Dae <inki.dae@...sung.com>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        dri-devel@...ts.freedesktop.org,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 4/7] drm/exynos/hdmi: add bridge support



2017년 02월 01일 16:34에 Andrzej Hajda 이(가) 쓴 글:
> On 01.02.2017 08:31, Inki Dae wrote:
>>
>> 2017년 01월 20일 15:52에 Andrzej Hajda 이(가) 쓴 글:
>>> In some platforms there is attached another device to the end of HDMI.
>>> The patch adds support for it.
>> Andrzej, can you clarify what bridge device can be attached and actually is now attached to the end of HDMI?
>> And I wonder if we have the device tree file which defines the bridge device in mainline. Seems we have no the device tree file.
>>
>> If nothing, then this patch should be merged with real use case.
> 
> SiI8620 MHL bridge in tm2/tm2e.

Did you post dt patch to add the properties related to SiI8620 MHL bridge device?

I see below patch series,
[PATCH 00/24] drm/bridge/sii8620: add Ultra HD modes support

but I couldn't find dt patch for it. And specifying SiI8620 MHL bridge device as description would be needed.

Thanks.

> 
> Regards
> Andrzej
> 
>>
>> Thanks.
>>
>>> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
>>> ---
>>>  drivers/gpu/drm/exynos/exynos_hdmi.c | 56 +++++++++++++++++++++++++++++-------
>>>  1 file changed, 46 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> index a73b192..41fb894 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> @@ -35,6 +35,7 @@
>>>  #include <linux/io.h>
>>>  #include <linux/of_address.h>
>>>  #include <linux/of_device.h>
>>> +#include <linux/of_graph.h>
>>>  #include <linux/hdmi.h>
>>>  #include <linux/component.h>
>>>  #include <linux/mfd/syscon.h>
>>> @@ -133,6 +134,7 @@ struct hdmi_context {
>>>  	struct regulator_bulk_data	regul_bulk[ARRAY_SIZE(supply)];
>>>  	struct regulator		*reg_hdmi_en;
>>>  	struct exynos_drm_clk		phy_clk;
>>> +	struct drm_bridge		*bridge;
>>>  };
>>>  
>>>  static inline struct hdmi_context *encoder_to_hdmi(struct drm_encoder *e)
>>> @@ -922,7 +924,15 @@ static int hdmi_create_connector(struct drm_encoder *encoder)
>>>  	drm_connector_register(connector);
>>>  	drm_mode_connector_attach_encoder(connector, encoder);
>>>  
>>> -	return 0;
>>> +	if (hdata->bridge) {
>>> +		encoder->bridge = hdata->bridge;
>>> +		hdata->bridge->encoder = encoder;
>>> +		ret = drm_bridge_attach(encoder->dev, hdata->bridge);
>>> +		if (ret)
>>> +			DRM_ERROR("Failed to attach bridge\n");
>>> +	}
>>> +
>>> +	return ret;
>>>  }
>>>  
>>>  static bool hdmi_mode_fixup(struct drm_encoder *encoder,
>>> @@ -1591,6 +1601,31 @@ static void hdmiphy_clk_enable(struct exynos_drm_clk *clk, bool enable)
>>>  		hdmiphy_disable(hdata);
>>>  }
>>>  
>>> +static int hdmi_bridge_init(struct hdmi_context *hdata)
>>> +{
>>> +	struct device *dev = hdata->dev;
>>> +	struct device_node *ep, *np;
>>> +
>>> +	ep = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
>>> +	if (!ep)
>>> +		return 0;
>>> +
>>> +	np = of_graph_get_remote_port_parent(ep);
>>> +	of_node_put(ep);
>>> +	if (!np) {
>>> +		DRM_ERROR("failed to get remote port parent");
>>> +		return -EINVAL;
>>> +	}
>>> +
>>> +	hdata->bridge = of_drm_find_bridge(np);
>>> +	of_node_put(np);
>>> +
>>> +	if (!hdata->bridge)
>>> +		return -EPROBE_DEFER;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>>  static int hdmi_resources_init(struct hdmi_context *hdata)
>>>  {
>>>  	struct device *dev = hdata->dev;
>>> @@ -1630,17 +1665,18 @@ static int hdmi_resources_init(struct hdmi_context *hdata)
>>>  
>>>  	hdata->reg_hdmi_en = devm_regulator_get_optional(dev, "hdmi-en");
>>>  
>>> -	if (PTR_ERR(hdata->reg_hdmi_en) == -ENODEV)
>>> -		return 0;
>>> +	if (PTR_ERR(hdata->reg_hdmi_en) != -ENODEV) {
>>> +		if (IS_ERR(hdata->reg_hdmi_en))
>>> +			return PTR_ERR(hdata->reg_hdmi_en);
>>>  
>>> -	if (IS_ERR(hdata->reg_hdmi_en))
>>> -		return PTR_ERR(hdata->reg_hdmi_en);
>>> -
>>> -	ret = regulator_enable(hdata->reg_hdmi_en);
>>> -	if (ret)
>>> -		DRM_ERROR("failed to enable hdmi-en regulator\n");
>>> +		ret = regulator_enable(hdata->reg_hdmi_en);
>>> +		if (ret) {
>>> +			DRM_ERROR("failed to enable hdmi-en regulator\n");
>>> +			return ret;
>>> +		}
>>> +	}
>>>  
>>> -	return ret;
>>> +	return hdmi_bridge_init(hdata);
>>>  }
>>>  
>>>  static struct of_device_id hdmi_match_types[] = {
>>>
>>
> 
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