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drm/sun4i: fix build failure with CONFIG_DRM_SUN8I_MIXER=m

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Having DRM_SUN4I built-in but DRM_SUN8I_MIXER as a loadable module results in
a link error, as we try to access a symbol from the sun8i_tcon_top.ko module:

ERROR: "sun8i_tcon_top_of_table" [drivers/gpu/drm/sun4i/sun8i-drm-hdmi.ko] undefined!
ERROR: "sun8i_tcon_top_of_table" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!

This solves the problem by adding a silent symbol for the tcon_top module,
building it as a separate module in exactly the cases that we need it,
but in a way that it is reachable by the other modules.

Fixes: 57e23de02f ("drm/sun4i: DW HDMI: Expand algorithm for possible crtcs")
Fixes: ef0cf6441f ("drm/sun4i: Add support for traversing graph with TCON TOP")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180711144403.1022829-1-arnd@arndb.de
This commit is contained in:
Arnd Bergmann 2018-07-11 16:43:10 +02:00 committed by Maxime Ripard
parent 7da9b2e47f
commit 58d4d29823
No known key found for this signature in database
GPG Key ID: D2B4C094214DAF74
4 changed files with 13 additions and 3 deletions
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7
drivers/gpu/drm/sun4i/Kconfig
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@ -68,4 +68,11 @@ config DRM_SUN8I_MIXER
graphics mixture and feed graphics to TCON, If M is
selected the module will be called sun8i-mixer.
config DRM_SUN8I_TCON_TOP
tristate
default DRM_SUN4I if DRM_SUN8I_MIXER!=n
help
TCON TOP is responsible for configuring display pipeline for
HTMI, TVE and LCD.
endif

3
drivers/gpu/drm/sun4i/Makefile
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@ -36,4 +36,5 @@ obj-$(CONFIG_DRM_SUN4I_BACKEND) += sun4i-backend.o sun4i-frontend.o
obj-$(CONFIG_DRM_SUN4I_HDMI) += sun4i-drm-hdmi.o
obj-$(CONFIG_DRM_SUN6I_DSI) += sun6i-dsi.o
obj-$(CONFIG_DRM_SUN8I_DW_HDMI) += sun8i-drm-hdmi.o
obj-$(CONFIG_DRM_SUN8I_MIXER) += sun8i-mixer.o sun8i_tcon_top.o
obj-$(CONFIG_DRM_SUN8I_MIXER) += sun8i-mixer.o
obj-$(CONFIG_DRM_SUN8I_TCON_TOP) += sun8i_tcon_top.o

3
drivers/gpu/drm/sun4i/sun4i_drv.c
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@ -216,7 +216,8 @@ static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
{
return !!of_match_node(sun8i_tcon_top_of_table, node);
return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
!!of_match_node(sun8i_tcon_top_of_table, node);
}
static int compare_of(struct device *dev, void *data)

3
drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
View File

@ -44,7 +44,8 @@ sun8i_dw_hdmi_mode_valid(struct drm_connector *connector,
static bool sun8i_dw_hdmi_node_is_tcon_top(struct device_node *node)
{
return !!of_match_node(sun8i_tcon_top_of_table, node);
return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
!!of_match_node(sun8i_tcon_top_of_table, node);
}
static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,