linux-kernel - Re: [PATCH v2 4/8] drm: rockchip/dp: add rockchip platform dp driver

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Date:	Mon, 10 Aug 2015 20:59:44 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Thierry Reding <treding@...dia.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Inki Dae <inki.dae@...sung.com>, djkurtz@...gle.com,
	dianders@...gle.com, seanpaul@...gle.com, joe@...ches.com,
	Takashi Iwai <tiwai@...e.de>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	David Airlie <airlied@...ux.ie>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Ajay Kumar <ajaykumar.rs@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Vincent Palatin <vpalatin@...omium.org>,
	Mark Yao <mark.yao@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>, ajaynumb@...il.com,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, linux-arm-ker@...L.NULL,
	nel@...ts.infradead.org
Subject: Re: [PATCH v2 4/8] drm: rockchip/dp: add rockchip platform dp driver

Hi Thierry,

在 2015/8/10 18:00, Thierry Reding 写道:
> On Sat, Aug 08, 2015 at 11:54:38AM +0800, Yakir Yang wrote:
> [...]
>>          edp: edp@...70000 {
> [...]
>>                  hsync-active-high = <0>;
>>                  vsync-active-high = <0>;
>>                  interlaced = <0>;
> These look like they should come from the display mode definition (EDID)
> rather than device tree.

I do think so, those numbers can parse from struct drm_mode. But I haven't
send those changes yet, cause I want to merge the split analogix_dp 
first, and
then send some patches to improve it. If you think it's better to 
imptoved those
now, I would like to do it , please let me know ;)

>>                  samsung,color-space = <0>;
>>                  samsung,dynamic-range = <0>;
>>                  samsung,ycbcr-coeff = <0>;
> I think these should also come from EDID, though I'm not sure if we
> store this in internal data structures yet.

Same to previous reply

>>                  samsung,color-depth = <1>;
> This is probably drm_display_info.bpc.

Same to previous reply

>>                  samsung,link-rate = <0x0a>;
>>                  samsung,lane-count = <1>;
> And these should really be derived from values in the DPCD and adjusted
> (if necessary) during link training.
>
> Why would you ever want to hard-code the above?

Yes, I do meet the problem that my eDP screen need lane-count to 4, but my
DP TV need lane-count to 1. Just like previous reply, if you think I 
should improved
them in this series, I would rather to do it.

>>>> +	dp->clk_24m = devm_clk_get(dev, "clk_dp_24m");
>>> Same here, maybe "dp_24m".
>> Like my previous reply. And actually as those two clocks all have
>> a common prefix "SCLK" in rk3288 clock tree, I thinkt we can name
>> them to "sclk_dp" & "sclk_dp_24m", is it okay ?
> I don't think there's a need for these common prefixes. The names here
> are identifiers in the context of the IP block, so any SoC-specific
> prefixes are irrelevant. Also they do appear, in DT and in code, in the
> context of clocks already, so "sclk_" or "clk_" is completely redundant
> in these names.

The sclk_dp & sclk_dp_24m is not IP common ask, it's only exist in 
RK3288 SoC (Like exynos
only got one "dp" clock), and actually I add this to rockchip platform 
dp driver not analogix
dp driver. So I think it's okay to add some platform some common prefixes.

And I got a better idea for those clock. "sclk_dp" & "sclk_dp_24m" is 
provided for the eDP phy,
and I just take Heiko suggest that add an new phy-rockchip-dp.c driver, 
so it's better to move
those clock to phy driver, and rename them to "dp-phy" && "dp-phy-24m".

Thanks,
- Yakir

> Thierry


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