linux-kernel - Re: [PATCH] drm: bridge: synopsys/dw-hdmi: Provide default configuration function for HDMI 2.0 PHY

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Date:   Thu, 22 Jun 2017 16:25:07 +0800
From:   Mark yao <mark.yao@...k-chips.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        郑阳 <yang.zheng@...k-chips.com>
Subject: Re: [PATCH] drm: bridge: synopsys/dw-hdmi: Provide default
 configuration function for HDMI 2.0 PHY

Hi Jose

Sorry miss your email and Sorry for the late reply

I can sure that your patch works on our rk3399 platform.

my internal kernel already has similar patch, using hdmi_phy_configure_dwc_hdmi_3d_tx() for hdmi 2.0 phy,
good works with many video modes (4k, 1080p, 720p etc.), I'm not familiar with hdmi,  but hdmi display actually works for us.

And, I had tried the 4.12-rc1 kernel with your patch, display works good.

So:
Tested-by: Mark Yao <mark.yao@...k-chips.com>

On 2017年06月13日 22:11, Jose Abreu wrote:
> Hi Laurent,
>
>
> Sorry for the late reply!
>
>
> On 10-06-2017 09:50, Laurent Pinchart wrote:
>> Hi Jose,
>>
>> On Friday 09 Jun 2017 13:53:12 Jose Abreu wrote:
>>> On 09-06-2017 12:04, Jose Abreu wrote:
>>>> Currently HDMI 2.0 PHYs do not have a default configuration function.
>>>>
>>>> As these PHYs have the same register layout as the 3D PHYs we can
>>>> safely use the default configuration function.
>>> I may have been a little to fast arriving at this conclusion. I
>>> mean most of the registers match but in the configuration
>>> function there are registers that do not match. Did you actually
>>> test this configuration function with an HDMI 2.0 phy? And did
>>> you test with different video modes? From my experience the phy
>>> may be wrongly configured and sometimes work anyway.
>>>
>>> Do please retest with as many video modes as you can and give me
>>> your phy ID (read from controller config reg HDMI_CONFIG2_ID).
>> The Renesas R-Car Gen3 HDMI PHY reports an DWC HDMI 2.0 TX PHY ID, but has a
>> configuration function (rcar_hdmi_phy_configure() in drivers/gpu/drm/rcar-
>> du/rcar_dw_hdmi.c) that doesn't match hdmi_phy_configure_dwc_hdmi_3d_tx().
>>  From the information I have been given the layout of the configuration
>> registers haven't been changed by Renesas. I know we've briefly discussed this
>> in the past, but I'd appreciate if you could have a second look and tell me
>> what you think.
> Yup, yours seems correct. Though at the time you submitted I
> found it odd that only 3 registers needed to be written whilst
> for HDMI 2.0 phys I have here 6 registers, but you said it is
> working so I though your phy was different ...
>
> Even so, one thing I would like to know is what was the max
> resolution you tested? I see you have clock values up to 297MHz,
> so 4k@...z? If I send a patch with a general config function for
> HDMI 2.0 phys can you test it on your platform?
>
> Best regards,
> Jose Miguel Abreu
>
>>>>   If, for some reason,
>>>>
>>>> the PHY is custom this change will not make any impact because
>>>> in configuration function we prefer the pdata provided configuration
>>>> function over the internal one.
>>>>
>>>> This patch is based on today's drm-misc-next branch.
>>>>
>>>> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
>>>> Cc: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
>>>> Cc: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
>>>> Cc: Archit Taneja <architt@...eaurora.org>
>>>> Cc: Andrzej Hajda <a.hajda@...sung.com>
>>>> Cc: Mark Yao <mark.yao@...k-chips.com>
>>>> Cc: Carlos Palminha <palminha@...opsys.com>
>>>> ---
>>>>
>>>>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 1 +
>>>>   1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>>>> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index ead1124..10c8d8c 100644
>>>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>>>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>>>> @@ -2170,6 +2170,7 @@ static irqreturn_t dw_hdmi_irq(int irq, void
>>>> *dev_id)
>>>>   		.name = "DWC HDMI 2.0 TX PHY",
>>>>   		.gen = 2,
>>>>   		.has_svsret = true,
>>>> +		.configure = hdmi_phy_configure_dwc_hdmi_3d_tx,
>>>>   	}, {
>>>>   		.type = DW_HDMI_PHY_VENDOR_PHY,
>>>>   		.name = "Vendor PHY",
>
>
>


-- 
Ｍark Yao