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: 57e23de02f48 ("drm/sun4i: DW HDMI: Expand algorithm for possible crtcs") Fixes: ef0cf6441fbb ("drm/sun4i: Add support for traversing graph with TCON TOP") Signed-off-by: Arnd Bergmann arnd@arndb.de --- v2: link the tcon top module separately instead of into the mixer --- drivers/gpu/drm/sun4i/Kconfig | 7 +++++++ drivers/gpu/drm/sun4i/Makefile | 3 ++- drivers/gpu/drm/sun4i/sun4i_drv.c | 3 ++- drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c | 3 ++- 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig index 156a865c3e6d..c2c042287c19 100644 --- a/drivers/gpu/drm/sun4i/Kconfig +++ b/drivers/gpu/drm/sun4i/Kconfig @@ -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 diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile index cd27d02c94e2..0eb38ac8e86e 100644 --- a/drivers/gpu/drm/sun4i/Makefile +++ b/drivers/gpu/drm/sun4i/Makefile @@ -39,4 +39,5 @@ endif 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 diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c index 6ddf4eaccb40..495d0fc41297 100644 --- a/drivers/gpu/drm/sun4i/sun4i_drv.c +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c @@ -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) diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c index 3459b9ec56c9..3704d95874c2 100644 --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c @@ -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,