If DRM_DP_HELPER is not set, bulding fails:
ld: drivers/gpu/drm/bridge/ite-it6505.o: in function `it6505_link_training_work': ite-it6505.c:(.text+0x50d8): undefined reference to `drm_dp_dpcd_write' ld: ite-it6505.c:(.text+0x51c4): undefined reference to `drm_dp_link_train_clock_recovery_delay' ld: ite-it6505.c:(.text+0x51d7): undefined reference to `drm_dp_dpcd_read_link_status' ld: ite-it6505.c:(.text+0x51ec): undefined reference to `drm_dp_clock_recovery_ok' ld: ite-it6505.c:(.text+0x5387): undefined reference to `drm_dp_get_adjust_request_voltage' ld: ite-it6505.c:(.text+0x539d): undefined reference to `drm_dp_get_adjust_request_pre_emphasis' ld: ite-it6505.c:(.text+0x5548): undefined reference to `drm_dp_link_train_channel_eq_delay' ld: ite-it6505.c:(.text+0x555b): undefined reference to `drm_dp_dpcd_read_link_status' ld: ite-it6505.c:(.text+0x5570): undefined reference to `drm_dp_clock_recovery_ok' ld: ite-it6505.c:(.text+0x558d): undefined reference to `drm_dp_channel_eq_ok' ld: ite-it6505.c:(.text+0x55da): undefined reference to `drm_dp_get_adjust_request_voltage' ld: ite-it6505.c:(.text+0x55f2): undefined reference to `drm_dp_get_adjust_request_pre_emphasis' ld: drivers/gpu/drm/bridge/ite-it6505.o: in function `it6505_bridge_detect': ite-it6505.c:(.text+0x59f1): undefined reference to `drm_dp_dpcd_read' ld: ite-it6505.c:(.text+0x5a16): undefined reference to `drm_dp_bw_code_to_link_rate' ld: ite-it6505.c:(.text+0x5a87): undefined reference to `drm_dp_dpcd_read' ld: ite-it6505.c:(.text+0x5ac1): undefined reference to `drm_dp_dpcd_write' ld: ite-it6505.c:(.text+0x5d43): undefined reference to `drm_dp_link_rate_to_bw_code'
Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver") Reported-by: Hulk Robot hulkci@huawei.com Signed-off-by: Zheng Bin zhengbin13@huawei.com --- drivers/gpu/drm/bridge/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 007e5a282f67..2145b08f9534 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -78,6 +78,7 @@ config DRM_ITE_IT6505 tristate "ITE IT6505 DisplayPort bridge" depends on OF select DRM_KMS_HELPER + select DRM_DP_HELPER select EXTCON help ITE IT6505 DisplayPort bridge chip driver. -- 2.31.1