linux-kernel - Re: [PATCH v12 0/18] Add Analogix Core Display Port Driver

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Date:	Sun, 17 Jan 2016 15:25:14 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	Yakir Yang <ykk@...k-chips.com>
Cc:	Inki Dae <inki.dae@...sung.com>,
	Mark Yao <mark.yao@...k-chips.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Thierry Reding <treding@...dia.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	emil.l.velikov@...il.com,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Kishon Vijay Abraham I <kishon@...com>,
	javier@....samsung.com, Andy Yan <andy.yan@...k-chips.com>,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v12 0/18] Add Analogix Core Display Port Driver

Hi Yakir,

Am Mittwoch, 13. Januar 2016, 15:59:51 schrieb Heiko Stuebner:
> Am Mittwoch, 23. Dezember 2015, 20:25:38 schrieb Yakir Yang:
> >    The Samsung Exynos eDP controller and Rockchip RK3288 eDP controller
> > 
> > share the same IP, so a lot of parts can be re-used. I split the common
> > code into bridge directory, then rk3288 and exynos only need to keep
> > some platform code. Cause I can't find the exact IP name of exynos dp
> > controller, so I decide to name dp core driver with "analogix" which I
> > find in rk3288 eDP TRM
> 
> could you rebase your patches on top of Dave's drm-next branch [0] please?
> The exynos part got some const attributes for the *_func_ops structs and
> drm_encoder_init got an additional parameter.
> I'm still hoping that we can get this finally committed once 4.5-rc1 is
> released in 1.5 weeks :-) .
> 
> I did try to merge things together [1], the system at least comes up and
> detects the panel (EDID is read correctly and it turns the backlight on)
> but I don't see any output on the display - hdmi works fine though and
> X11 is claiming everything to be fine in both cases.
> 
> So I don't know yet if I made a mistake when putting this together or
> there is an issue on the driver-side.

I was able to debug this a bit more, and it seems the encoder_helper_funcs 
don't like the prepare/commit callbacks and like enable better.

So when I do something similar to Marks patch a8eef71d38da ("drm/rockchip: 
dw_hdmi: use encoder enable function"), like in the attached patch (to be 
folded into the original addition of those functions), I get display output 
again.


Heiko

> [0] http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-next
> [1] https://github.com/mmind/linux-rockchip/tree/tmp/analogixdp_v12-veyron
> I left out patch16, per your talk with Jingoo and me not seeing any AUX
> CH errors without it.

View attachment "0001-analogix_dp-rockchip-use-.enable-instead-of-preprare.patch" of type "text/x-patch" (1407 bytes)