From: Arnd Bergmann <arnd@arndb.de>

Without the DP helper code, the newly added displayport support
causes a link failure:

x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.o: in function `hibmc_dp_aux_init':
dp_aux.c:(.text+0x37e): undefined reference to `drm_dp_aux_init'
x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_set_pattern':
dp_link.c:(.text+0xae): undefined reference to `drm_dp_dpcd_write'
x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_get_adjust_train':
dp_link.c:(.text+0x121): undefined reference to `drm_dp_get_adjust_request_voltage'
x86_64-linux-ld: dp_link.c:(.text+0x12e): undefined reference to `drm_dp_get_adjust_request_pre_emphasis'
x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_training':
dp_link.c:(.text+0x2b0): undefined reference to `drm_dp_dpcd_write'
x86_64-linux-ld: dp_link.c:(.text+0x2e3): undefined reference to `drm_dp_dpcd_write'

Add both DRM_DISPLAY_DP_HELPER and DRM_DISPLAY_HELPER, which is
in turn required by the former.

Fixes: 0ab6ea261c1f ("drm/hisilicon/hibmc: add dp module in hibmc")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/hisilicon/hibmc/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/hisilicon/hibmc/Kconfig b/drivers/gpu/drm/hisilicon/hibmc/Kconfig
index 93b8d32e3be1..98d77d74999d 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/Kconfig
+++ b/drivers/gpu/drm/hisilicon/hibmc/Kconfig
@@ -4,6 +4,8 @@ config DRM_HISI_HIBMC
 	depends on DRM && PCI
 	depends on MMU
 	select DRM_CLIENT_SELECTION
+	select DRM_DISPLAY_HELPER
+	select DRM_DISPLAY_DP_HELPER
 	select DRM_KMS_HELPER
 	select DRM_VRAM_HELPER
 	select DRM_TTM
-- 
2.39.5

On Mon, 27 Jan 2025 08:10:02 +0100, Arnd Bergmann wrote:
> Without the DP helper code, the newly added displayport support
> causes a link failure:
> 
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.o: in function `hibmc_dp_aux_init':
> dp_aux.c:(.text+0x37e): undefined reference to `drm_dp_aux_init'
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_set_pattern':
> dp_link.c:(.text+0xae): undefined reference to `drm_dp_dpcd_write'
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_get_adjust_train':
> dp_link.c:(.text+0x121): undefined reference to `drm_dp_get_adjust_request_voltage'
> x86_64-linux-ld: dp_link.c:(.text+0x12e): undefined reference to `drm_dp_get_adjust_request_pre_emphasis'
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_training':
> dp_link.c:(.text+0x2b0): undefined reference to `drm_dp_dpcd_write'
> x86_64-linux-ld: dp_link.c:(.text+0x2e3): undefined reference to `drm_dp_dpcd_write'
> 
> [...]

Applied to drm-misc-fixes, thanks!

[1/1] drm/hisilicon/hibmc: select CONFIG_DRM_DISPLAY_DP_HELPER
      commit: 9ab127a18018fb06bd42a54ed38bb7b8c449d686

Best regards,
-- 
With best wishes
Dmitry

On Mon, Jan 27, 2025 at 08:10:02AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> Without the DP helper code, the newly added displayport support
> causes a link failure:
> 
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.o: in function `hibmc_dp_aux_init':
> dp_aux.c:(.text+0x37e): undefined reference to `drm_dp_aux_init'
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_set_pattern':
> dp_link.c:(.text+0xae): undefined reference to `drm_dp_dpcd_write'
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_get_adjust_train':
> dp_link.c:(.text+0x121): undefined reference to `drm_dp_get_adjust_request_voltage'
> x86_64-linux-ld: dp_link.c:(.text+0x12e): undefined reference to `drm_dp_get_adjust_request_pre_emphasis'
> x86_64-linux-ld: drivers/gpu/drm/hisilicon/hibmc/dp/dp_link.o: in function `hibmc_dp_link_training':
> dp_link.c:(.text+0x2b0): undefined reference to `drm_dp_dpcd_write'
> x86_64-linux-ld: dp_link.c:(.text+0x2e3): undefined reference to `drm_dp_dpcd_write'
> 
> Add both DRM_DISPLAY_DP_HELPER and DRM_DISPLAY_HELPER, which is
> in turn required by the former.
> 
> Fixes: 0ab6ea261c1f ("drm/hisilicon/hibmc: add dp module in hibmc")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/Kconfig | 2 ++
>  1 file changed, 2 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> 

-- 
With best wishes
Dmitry