linux-kernel - Re: [v14, 01/17] drm: bridge: analogix/dp: split exynos dp driver to bridge directory

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Date:	Wed, 30 Mar 2016 13:32:04 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Yakir Yang <ykk@...k-chips.com>
Cc:	Inki Dae <inki.dae@...sung.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Thierry Reding <treding@...dia.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Mark Yao <mark.yao@...k-chips.com>,
	Russell King <linux@....linux.org.uk>, djkurtz@...omium.org,
	Sean Paul <seanpaul@...omium.org>,
	Kukjin Kim <kgene@...nel.org>,
	Kumar Gala <galak@...eaurora.org>, emil.l.velikov@...il.com,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Kishon Vijay Abraham I <kishon@...com>,
	Pawel Moll <pawel.moll@....com>, ajaynumb@...il.com,
	robherring2@...il.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,
	Douglas Anderson <dianders@...omium.org>
Subject: Re: [v14, 01/17] drm: bridge: analogix/dp: split exynos dp driver to
 bridge directory

Hi,

On Mon, Feb 15, 2016 at 07:09:36PM +0800, Yakir Yang wrote:
> Split the dp core driver from exynos directory to bridge directory,
> and rename the core driver to analogix_dp_*, rename the platform
> code to exynos_dp.
> 
> Beside the new analogix_dp driver would export six hooks.
> "analogix_dp_bind()" and "analogix_dp_unbind()"
> "analogix_dp_suspned()" and "analogix_dp_resume()"
> "analogix_dp_detect()" and "analogix_dp_get_modes()"
> 
> The bind/unbind symbols is used for analogix platform driver to connect
> with analogix_dp core driver. And the detect/get_modes is used for analogix
> platform driver to init the connector.
> 
> They reason why connector need register in helper driver is rockchip drm
> haven't implement the atomic API, but Exynos drm have implement it, so
> there would need two different connector helper functions, that's why we
> leave the connector register in helper driver.
> 
> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
> 
[ ... ]

> diff --git a/drivers/gpu/drm/bridge/analogix/Makefile b/drivers/gpu/drm/bridge/analogix/Makefile
> new file mode 100644
> index 0000000..9107b86
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/analogix/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix_dp_core.o analogix_dp_reg.o

This results in the following build errors if DRM_ANALOGIX_DP
is configured as module.

ERROR: "analogix_dp_start_video" [drivers/gpu/drm/bridge/analogix/analogix_dp_core.ko] undefined!
ERROR: "analogix_dp_get_lane0_link_training" [drivers/gpu/drm/bridge/analogix/analogix_dp_core.ko] undefined!
ERROR: "analogix_dp_get_lane1_link_training" [drivers/gpu/drm/bridge/analogix/analogix_dp_core.ko] undefined!
ERROR: "analogix_dp_get_lane2_link_training" [drivers/gpu/drm/bridge/analogix/analogix_dp_core.ko] undefined!
ERROR: "analogix_dp_get_lane3_link_training" [drivers/gpu/drm/bridge/analogix/analogix_dp_core.ko] undefined!
ERROR: "analogix_dp_get_lane_count" [drivers/gpu/drm/bridge/analogix/analogix_dp_core.ko] undefined!
ERROR: "analogix_dp_get_link_bandwidth" [drivers/gpu/drm/bridge/analogix/analogix_dp_core.ko] undefined!

[ and so on ]

It should probably be something like

analogix_dp-objs := analogix_dp_core.o analogix_dp_reg.o
obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix_dp.o

Guenter