drm: Switch DRM_DISPLAY_DP_AUX_BUS to depends on

Most of our helpers have relied on being selected so far through
Kconfig, but that creates issues when we have multiple layers of helpers
with some depending on others.

Indeed, select doesn't select a dependency's dependencies, and thus
isn't super intuitive. Depends on however doesn't have that limitation,
so we can just switch all the drivers that were selecting
DRM_DISPLAY_DP_AUX_BUS to depend on it.

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/20240327-kms-kconfig-helpers-v3-9-eafee11b84b3@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

drivers/gpu/drm/bridge/Kconfig

@@ -92,11 +92,11 @@ config DRM_FSL_LDB
 
 config DRM_ITE_IT6505
 	tristate "ITE IT6505 DisplayPort bridge"
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
-	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_KMS_HELPER
 	select DRM_DP_HELPER
 	select EXTCON
@@ -226,10 +226,10 @@ config DRM_PARADE_PS8622
 
 config DRM_PARADE_PS8640
 	tristate "Parade PS8640 MIPI DSI to eDP Converter"
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	select DRM_DISPLAY_DP_HELPER
-	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL
@@ -381,6 +381,7 @@ config DRM_TI_SN65DSI83
 
 config DRM_TI_SN65DSI86
 	tristate "TI SN65DSI86 DSI to eDP bridge"
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	select DRM_DISPLAY_DP_HELPER
@@ -389,7 +390,6 @@ config DRM_TI_SN65DSI86
 	select DRM_PANEL
 	select DRM_MIPI_DSI
 	select AUXILIARY_BUS
-	select DRM_DISPLAY_DP_AUX_BUS
 	help
 	  Texas Instruments SN65DSI86 DSI to eDP Bridge driver
 

drivers/gpu/drm/bridge/analogix/Kconfig

@@ -33,11 +33,11 @@ config DRM_ANALOGIX_DP
 config DRM_ANALOGIX_ANX7625
 	tristate "Analogix Anx7625 MIPI to DP interface support"
 	depends on DRM
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDCP_HELPER
-	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_MIPI_DSI
 	help
 	  ANX7625 is an ultra-low power 4K mobile HD transmitter

drivers/gpu/drm/display/Kconfig

@@ -11,6 +11,7 @@ config DRM_DISPLAY_DP_AUX_BUS
 	tristate "DRM DisplayPort AUX bus support"
 	depends on DRM
 	depends on OF || COMPILE_TEST
+	default y
 
 config DRM_DISPLAY_DP_AUX_CEC
 	bool "Enable DisplayPort CEC-Tunneling-over-AUX HDMI support"

drivers/gpu/drm/mediatek/Kconfig

@@ -22,11 +22,11 @@ config DRM_MEDIATEK
 
 config DRM_MEDIATEK_DP
 	tristate "DRM DPTX Support for MediaTek SoCs"
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on DRM_MEDIATEK
 	select PHY_MTK_DP
 	select DRM_DISPLAY_DP_HELPER
-	select DRM_DISPLAY_DP_AUX_BUS
 	help
 	  DRM/KMS Display Port driver for MediaTek SoCs.
 

drivers/gpu/drm/msm/Kconfig

@@ -5,6 +5,7 @@ config DRM_MSM
 	depends on ARCH_QCOM || SOC_IMX5 || COMPILE_TEST
 	depends on COMMON_CLK
 	depends on DRM
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on IOMMU_SUPPORT
 	depends on QCOM_AOSS_QMP || QCOM_AOSS_QMP=n
@@ -15,7 +16,6 @@ config DRM_MSM
 	select IOMMU_IO_PGTABLE
 	select QCOM_MDT_LOADER if ARCH_QCOM
 	select REGULATOR
-	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_DISPLAY_DP_HELPER
 	select DRM_EXEC
 	select DRM_KMS_HELPER

drivers/gpu/drm/panel/Kconfig

@@ -560,11 +560,11 @@ config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01
 config DRM_PANEL_SAMSUNG_ATNA33XC20
 	tristate "Samsung ATNA33XC20 eDP panel"
 	depends on BACKLIGHT_CLASS_DEVICE
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	depends on PM
 	select DRM_DISPLAY_DP_HELPER
-	select DRM_DISPLAY_DP_AUX_BUS
 	help
 	  DRM panel driver for the Samsung ATNA33XC20 panel. This panel can't
 	  be handled by the DRM_PANEL_SIMPLE driver because its power
@@ -800,12 +800,12 @@ config DRM_PANEL_STARTEK_KD070FHFID015
 config DRM_PANEL_EDP
 	tristate "support for simple Embedded DisplayPort panels"
 	depends on BACKLIGHT_CLASS_DEVICE
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	depends on PM
 	select VIDEOMODE_HELPERS
 	select DRM_DISPLAY_DP_HELPER
-	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_KMS_HELPER
 	help
 	  DRM panel driver for dumb eDP panels that need at most a regulator and

drivers/gpu/drm/tegra/Kconfig

@@ -4,11 +4,11 @@ config DRM_TEGRA
 	depends on ARCH_TEGRA || COMPILE_TEST
 	depends on COMMON_CLK
 	depends on DRM
+	depends on DRM_DISPLAY_DP_AUX_BUS
 	depends on DRM_DISPLAY_HELPER
 	depends on OF
 	select DRM_DISPLAY_DP_HELPER
 	select DRM_DISPLAY_HDMI_HELPER
-	select DRM_DISPLAY_DP_AUX_BUS
 	select DRM_KMS_HELPER
 	select DRM_MIPI_DSI
 	select DRM_PANEL